Is 11360.1985_Smoke Detectors

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IS 11360 (1985, Reaffirmed 2010): Specification for Smoke

Detectors for Use in Automatic Electrical Fire Alarm

System. UDC 614.842.435 : 654.924.56


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REAfFiRMED-" n('1 20\n

Indian StandardSPECIFICATION FOR

IS: 11360 - 1985(Reaffirmed 2005)

SMOKE DETECTORS FOR USE IN AUTOMATICELECTRICAL FIRE ALRAM SYSTEM

Gr5

( First Reprint OCTOBER 2007 )

UDC 614.842.435: 654.924.56

Copyright 1986B UREA U OF IND IAN STANDARD SMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARGNEW DELHI 110002

February 1986

REAfFiRMED-" n('1 20\n. , , ~


IS: 11360 - 1985(Reaffirmed 2005)

SMOKE DETECTORS FOR USE IN AUTOMATICELECTRICAL FIRE ALRAM SYSTEM

Gr5

( First Reprint OCTOBER 2007 )

UDC 614.842.435: 654.924.56

Copyright 1986B UREA U OF IND IAN STANDARD SMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARGNEW DELHI 110002

February 1986


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IS : 11360 1985


SMOKE DETECTORS FOR USE IN AUTOMATICELECTRICAL FIRE ALARM SYSTEM

Fire Fighting Sectional Committee, BDC 22Chairman

SHRI G. B. MENONRepresenting

Gujarat Electricity Board, VadodaraMembers

SHRI S. R. BANSAL Steel Authority of India Ltd ( Bokaro Steel Plant ),New DelhiSIlRIB. L. CHAUDHRY Oil and Natural Gas Commission, Dehra DunSHRI B. K. SIPPY ( Alternate)SHRI K. K. DAS Gi:rl'TA West Bengal Fire Services,DEPUTY INSPECTOR(RPSF)

West Bengal, CalcuttaGENERAL Ministry of RailwaysASSISTANT SECURITY OFFIOER ( FIRE)NORTHERN RAILWAY ( Alternate)SHm S. M. DESAI State Bank ofIndia, BombaySHlU V. P. DEWAN . Ministry of Defence (DGI)LT-COL V. R. BAN AHATI (Alternate)

Government of

SHRI S. K. DHERI Municipal Corporation of Delhi (Delhi FireService ), DelhiSRRI R. K. BHA,RDW AJ ( Alternate)SHRI R. R. DHOBLEY . Bhabha Atomic Research Centre, BombayDIREOTOR Home Department (Fire Service), Governmentof Tamil Nadu, MadrasDEPUTY DIREOTOR ( Alternate)DIRECTOR GENERAL OF FIRE Home (Police) Department, Government ofS]l)RVJCES Andhra Pradesh, HyderabadDEPUTY DIRECTOR (FIRESERVICES) ( Alternate)FIRE ADVISERSHR! A. K. GUPTA

Ministry of Home AffairsCentral Building Research Imtitute ( CSIR ),Roorkee

( Continued on page 2 ) Copyright 1986

BUREAU OF INDIAN STANDARDSThis publication is protected under the Indian Copyright Act (XIV of 1957) andreproduction in whole or in part by any means except with written permission of thepublisher shall be deemed to be an infringement of copyright under the said Act.

IS : 11360 1985



Fire Fighting Sectional Committee, BDC 22Chairman

SHRI G. B. MENONRepresenting

Gujarat Electricity Board, VadodaraMembers

SHRI S. R. BANSAL Steel Authority of India Ltd ( Bokaro Steel Plant ),New DelhiSIlRIB. L. CHAUDHRY Oil and Natural Gas Commission, Dehra DunSHRI B. K. SIPPY ( Alternate)SHRI K. K. DAS Gi:rl'TA West Bengal Fire Services,DEPUTY INSPECTOR(RPSF)

West Bengal, CalcuttaGENERAL Ministry of RailwaysASSISTANT SECURITY OFFIOER ( FIRE)NORTHERN RAILWAY ( Alternate)SHm S. M. DESAI State Bank ofIndia, BombaySHlU V. P. DEWAN . Ministry of Defence ( DGI )LT-COL V. R. BAN AHATI (Alternate)

Government of

SHRI S. K. DHERI Municipal Corporation of Delhi (Delhi FireService ), DelhiSRRI R. K. BHA,RDW AJ ( Alternate)SHRI R. R. DHOBLEY . Bhabha Atomic Research Centre, BombayDIREOTOR Home Department (Fire Service), Governmentof Tamil Nadu, MadrasDEPUTY DIREOTOR ( Alternate)DIRECTOR GENERAL OF FIRE Home (Police) Department, Government ofS]l)RVJCES Andhra Pradesh, HyderabadDEPUTY DIRECTOR (FIRESERVICES) ( Alternate)FIRE ADVISERSHR! A. K. GUPTA

Ministry of Home AffairsCentral Building Research Imtitute ( CSIR ),Roorkee

( Continued on page 2 ) Copyright 1986

BUREAU OF INDIAN STANDARDSThis publication is protected under the Indian Copyright Act (XIV of 1957) andreproduction in whole or in part by any means except with written permission of thepublisher shall be deemed to be an infringement of copyright under the said Act.


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IS: 11360 - 1985( Continued from page 1 )

MembersSHRI J. S. JAMSHEDJI

SHRI C. GNANRAJ ( Alternate)SHRI P. KHANNASHRI S; N. KUNDUMANAGING DmEOTOR

Repres4ntingSteelage Industries Limited (Minimax Division),BombayJayashree Textiles and Industries, RishraFire and Safety Appliances Co, CalcuttaAvon Services ( Production and Agencies) Pv t Ltd,BombayTEOHNIOAL EXECUTIVE ( Alternate)SHRI P. N. MEHROTRA Institution of Fire Engineers ( India), New DelhiSHRI B. R. MERTA ( Alternate)BRIG S. A. MOHILE Ministry of Defence ( R&D )SHRr A. K. SURI ( Alternate)SHEI M. MUKHERJI Steel Authority of India Ltd (Rourkela SteelPlant ), RourkelaSHRI C. D. SHARMA ( Alternate)SRRI V. B. NIKAlI! Municipal Corporation of Greater Bombay

SHRI P. N. PANCHAL ( Bombay Fire Brigade ), BombayCentral Industrial Security Force (Ministry ofHome Affairs), New DelhiSRRI H .M . SABADRA Reliable (Fire Protection) Industries, BombaySHRI P.H. SETHNA Kooverji Devshi and Co (P) Ltd, BombaySHRI N. T. PANJWANI (Alternate)SHEI R. C. SHARMA Directorate General of Supplies and Disposals,New DelhiSHRI D. S. NARESH ( Alternate)SHRI D. K. SmKAR Synthetics and Chemicals Ltd, BareillySHRI CHANDRAKANT M. SHAH Zenith Fire Services, BombaySHRI M. H. SHAH ( Alternate)SHRI B. J . SHAH Newage Industries, SurendranagarSHRI A. M. SHAH ( Alternate)SHRI T ARIT SURSHEI SUilHIL KUMARSHE-I J . N. YAKILSRRI K. RAVI ( Alternate)SHEI S. VENKASWAMYSHRI B. V. WAGLE

Surex Production and Sales (P) Ltd, CalcuttaDirectorate General of Technical Development,New DelhiTariff Advisory Committee-, BombayDirectorate General of Civil Aviation, New DelhiUrban Development, Public Health and HousingDepartment, Government of Maharashtra,BombaySHRI V. H. MADKAIKAR ( Alternale )SHRI G. RAMAN, Director General, lSI ( Ex-officio Member )Director ( Civ Engg)

SecretarySHRI K. M. MATHURJoint Director ( Civ Engg ), lSI

2( Continued on page 19 )

IS: 11360 - 1985( Continued from page 1 )

MembersSHRI J. S. JAMSHEDJI

SHRI C. GNANRAJ ( Alternate)SHRI P. KHANNASHRI S; N. KUNDUMANAGING DmEOTOR

Repres4ntingSteelage Industries Limited (Minimax Division),BombayJayashree Textiles and Industries, RishraFire and Safety Appliances Co, CalcuttaAvon Services ( Production and Agencies) Pv t Ltd,BombayTEOHNIOAL EXECUTIVE ( Alternate)SHRI P. N. MEHROTRA Institution of Fire Engineers ( India), New DelhiSHRI B. R. MERTA ( Alternate)BRIG S. A. MOHILE Ministry of Defence ( R&D )SHRr A. K. SURI ( Alternate)SHEI M. MUKHERJI Steel Authority of India Ltd (Rourkela SteelPlant ), RourkelaSHRI C. D. SHARMA ( Alternate)SRRI V. B. NIKAlI! Municipal Corporation of Greater Bombay

SHRI P. N. PANCHAL ( Bombay Fire Brigade ), BombayCentral Industrial Security Force (Ministry ofHome Affairs), New DelhiSRRI H .M . SABADRA Reliable (Fire Protection) Industries, BombaySHRI P.H. SETHNA Kooverji Devshi and Co (P) Ltd, BombaySHRI N. T. PANJWANI (Alternate)SHEI R. C. SHARMA Directorate General of Supplies and Disposals,New DelhiSHRI D. S. NARESH ( Alternate)SHRI D. K. SmKAR Synthetics and Chemicals Ltd, BareillySHRI CHANDRAKANT M. SHAH Zenith Fire Services, BombaySHRI M. H. SHAH ( Alternate)SHRI B. J . SHAH Newage Industries, SurendranagarSHRI A. M. SHAH ( Alternate)SHRI T ARIT SURSHEI SUilHIL KUMARSHE-I J . N. YAKILSRRI K. RAVI ( Alternate)SHEI S. VENKASWAMYSHRI B. V. WAGLE

Surex Production and Sales (P) Ltd, CalcuttaDirectorate General of Technical Development,New DelhiTariff Advisory Committee-, BombayDirectorate General of Civil Aviation, New DelhiUrban Development, Public Health and HousingDepartment, Government of Maharashtra,BombaySHRI V. H. MADKAIKAR ( Alternale )SHRI G. RAMAN, Director General, lSI ( Ex-officio Member )Director ( Civ Engg)

SecretarySHRI K. M. MATHURJoint Director ( Civ Engg ), lSI

2( Continued on page 19 )


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IS : 11360 1985


O. FOREWORD0.1 This Indian Standard was adopted by the Indian StandardsInstitution on 30 July 1985, after the draft finalized by the Fire FightingSectional Committee had been approved by the Civil EngineeringDivision Council.0.2 Property damage caused by a fire is directly related to (a) intensityof fire and (b) duration of fire. The intensity of fire depends upon thetime available for its growth, type and geometrical configuration ofcombustibles, ventilation, etc. The duration of fire depends upon thequantity of combustible and the point at which extinction process starts.0.3 Life risk is predominantly posed by smoke and other toxic productsof combustion which travel faster and farther than fire. The amount ofcombustion products and speed of their travel is directly proportional tothe intensity of fire.0.4 In order to ensure life safety, and reduce property loss there is aneed to detect fires in an incipient stage, which will provide a reasonableinterval of time for inmates to escape to a place of safety and which willgive a reasonable chance to fire fighters to control and extinguish thefire with minimum loss.0.5 Fires are detected by utilizing the various physical and chemicalchanges produced by it. One of the predominent phenomenon in theearly growth stage of fire is production of invisible aerosols and smoke.The probes which detect the invisible aerosol and smoke are called-smoke detectors. A system which utilizes such devices to initiate audioa n ~ visual alarm is called 'automatic smoke and fire detection system'.Certain types of devices, which detect fires by oxidisable gases such asthose released by burning materials fall outside scope of this standard.0.6 The aim of standardization of any device is to ensure that thequality of material is good, and that the equipment performs its taskunder the conditions it may be subjected to during its usage. It is,therefore, necessary to prepare an Indian Standard on smoke detectors

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IS : 11360 1985


O. FOREWORD0.1 This Indian Standard was adopted by the Indian StandardsInstitution on 30 July 1985, after the draft finalized by the Fire FightingSectional Committee had been approved by the Civil EngineeringDivision Council.0.2 Property damage caused by a fire is directly related to (a) intensityof fire and (b) duration of fire. The intensity of fire depends upon thetime available for its growth, type and geometrical configuration ofcombustibles, ventilation, etc. The duration of fire depends upon thequantity of combustible and the point at which extinction process starts.0.3 Life risk is predominantly posed by smoke and other toxic productsof combustion which travel faster and farther than fire. The amount ofcombustion products and speed of their travel is directly proportional tothe intensity of fire.0.4 In order to ensure life safety, and reduce property loss there is aneed to detect fires in an incipient stage, which will provide a reasonableinterval of time for inmates to escape to a place of safety and which willgive a reasonable chance to fire fighters to control and extinguish thefire with minimum loss.0.5 Fires are detected by utilizing the various physical and chemicalchanges produced by it. One of the predominent phenomenon in theearly growth stage of fire is production of invisible aerosols and smoke.The probes which detect the invisible aerosol and smoke are called-smoke detectors. A system which utilizes such devices to initiate audioa n ~ visual alarm is called 'automatic smoke and fire detection system'.Certain types of devices, which detect fires by oxidisable gases such asthose released by burning materials fall outside scope of this standard.0.6 The aim of standardization of any device is to ensure that thequality of material is good, and that the equipment performs its taskunder the conditions it may be subjected to during its usage. It is,therefore, necessary to prepare an Indian Standard on smoke detectors

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IS : 11360 - 1985covering specifications so as to enable the users to choose a standarddevice and also to help the indigenous manufacturers to manufacturestandard detector heads. Detail of installations is being coveredseparately.0':7 .The disposal of the ionization detectors and marking on them forthe presence of radioactive material shall be in a manner acceptable .tothe Department of Atomic Energy, Government of India and relevantstatutory provisions. .0.8 For the purpose of deciding whether a particular requirement of thisstandard is complied with, the final value, observed or calculated,expressing the result o f a test or analysis, shall be rounded off in accordance with IS : 2-1960*. The number of significant places retained inthe rounded off value should be the same as that of the specified value inthis standard.

1. SCOPE1.1 This standard covers general constructional features, performancerequirements and test methods for optical and ionization types of smokedetectors intended for indoor installations to ensure the maintainabilityof their performance under different environmental conditions.2. DEFINITIONS2.0 For the purpose of this standard, the following definitions shalla'pply.2.1 Ionization ChaIDber - A chamber having two electrodes acrossit for power connection, open to air and containing radioactive materialto generations within the air inside so that an ionization current flowsthrough the chamber whenever a potential difference exists between theelectrodes.2.2 Ionization SIDoke Detector - A detector employing ionizationchamber(s) as sensing means for detecting aerosols given off by fires.2.3 Optical (Photo-electric) SIDoke Detector - A dete


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IS : 11360 19852.5. Normal Ccndition - The condition in which the detector issupplied with power being connected to its cpntrol and indicating equipment or equivalent power source, but not giving fire or fault signal.2.6 Alarm Condition - The condition in which the detector is givingsignal indicating the e x i ~ t a n c e of fire.2.7 Low Voltage Detector - A detector requiring a potential of notmore than 30 volts dc or 30 volts ( rms ) ac for operation and is poweredfrom a source whose power is limited to 100 volt-amperes.2.8 High Voltage Detector - A defector operating on potential inexcess of low voltage detector.3. GENERAL REQUIREMENTS3.1 A visual indication of normal condition when provided shall bevisible from a distance of 6 m.3.2 A visual indication of detector's alarm condition shall be providedwhich shall be visible from a distance of 6 m and shall be visuallydifferent from the indication(s) of other condition(s).3.3 Failure of any indicator lamp shall not prevent the detector fromemitting fire signal indicating the existence of fire.3.4 Where separate bases are designed for mounting the detectors, meansshall be provided to prevent incorrect alignment and/or incorrectconnection(s) of the detector by adopting plugging type systems.3.5 'Terminals for external wires shall be provided which shall allowconnections of conductors having nominal cross-sectional area between0'92 and 2'5 rilm2 Terminals shall rigidly clamp the conductor betweenmetal surfaces with moderate contact pressure and without damage tothe conductor. Disconnection shall be possible only with the use of atool.3.6 Construction of a low voltage detector including mounting bases ifany shall be such that current carrying parts are not exposed tounintended contact.3.7 A high-voltage detector shall have an overall non-metallic cover. I fmatallic insulated enclosure and cover are provided the same shall beprovided with a ground terminal.3.8 The openings for smoke entry shall be at least 30 mm below theceiling level assumed smooth and fiat.

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IS : 11360 19852.5. Normal Ccndition - The condition in which the detector issupplied with power being connected to its cpntrol and indicating equipment or equivalent power source, but not giving fire or fault signal.2.6 Alarm Condition - The condition in which the detector is givingsignal indicating the e x i ~ t a n c e of fire.2.7 Low Voltage Detector - A detector requiring a potential of notmore than 30 volts dc or 30 volts ( rms ) ac for operation and is poweredfrom a source whose power is limited to 100 volt-amperes.2.8 High Voltage Detector - A defector operating on potential inexcess of low voltage detector.3. GENERAL REQUIREMENTS3.1 A visual indication of normal condition when provided shall bevisible from a distance of 6 m.3.2 A visual indication of detector's alarm condition shall be providedwhich shall be visible from a distance of 6 m and shall be visuallydifferent from the indication(s) of other condition(s).3.3 Failure of any indicator lamp shall not prevent the detector fromemitting fire signal indicating the existence of fire.3.4 Where separate bases are designed for mounting the detectors, meansshall be provided to prevent incorrect alignment and/or incorrectconnection(s) of the detector by adopting plugging type systems.3.5 'Terminals for external wires shall be provided which shall allowconnections of conductors having nominal cross-sectional area between0'92 and 2'5 rilm2 Terminals shall rigidly clamp the conductor betweenmetal surfaces with moderate contact pressure and without damage tothe conductor. Disconnection shall be possible only with the use of atool.3.6 Construction of a low voltage detector including mounting bases ifany shall be such that current carrying parts are not exposed tounintended contact.3.7 A high-voltage detector shall have an overall non-metallic cover. I fmatallic insulated enclosure and cover are provided the same shall beprovided with a ground terminal.3.8 The openings for smoke entry shall be at least 30 mm below theceiling level assumed smooth and fiat.

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IS : 11360 - 19854. PERFORMANCE TEST AND CRITERIA FOR CONFORMITY4.0 A sample of 15 numbers of detectors of each design* selectedrandomly from production of not less than 200 shall be used for testingand shall be numbered as 1 to 15. The tests (one or more) on thedetectors shall be carried out in the order given in test schedule given.inAppendix A according to methods given in 4.1 to 4.18. All the tests aretype tests which cover the, production of 10 000 members. The detectorsshall pass all the tests. '4.1 Directional Dependence - A randomly choosen detector from thesample shall be mounted in the testing tunnel in its normal operatingposition ~ n d with a random orientation with respect to flow direction ofthe smoke. Its response threshold value ( r.t.v. ) shall be measured inaccordance with Appendix B. It shall then be rotated by 45 about itsvertical axis and its r.t.v. shall again be measured. Thus 8 measurements of its r. t. v. in 8 orientations shall be recorded so that rotation ofthe detector about vertical axis js complete. The ratio of highest r.t.v.and lowest l'.t.v. shall not exceed 1-6 and the lowest r.t.v. shall be notless than '05 dB/m.

NOTE - The direction of highest r.t.v. is the least favourable orientation and thedirection of lowest r.t.v. is the most favourable orientation of the detector. In thefollowing tests where determination of r.t.v. is required on the tunnel mounteddetector, it shall be made using the least favourable orientation of the detector:4.2 Reproducibility and, Optimal Sensitivity - The r.t.v. of allthe detectors of the sample shall be measured as in Appendix B for theleast favourable orientation. Detectors shall be graded in order ofincreasing r.t.v. number 1 having lowest r.t.v. and 15 number havinghighest r.t.v. The ratio of highest r.t.v. and lowest r.t.v. shall notexceed 1'6 and the lowest r.t.v. shall not be less than '05 dB/m.4.3 Stability - Detectors numbered 3 shall be mounted ill the tunneland left energized. Two measurements ofr.t.v. shall be made, accord-ing to Appendix B after one day of energization. The detector shall bereset and energization restored immediately after the measurement;second measurement ofr.t.v. shall be taken after 10 days of energization. Other than the first 2 minutes of energization, the detector shallnot give fire or fault alarm and the ratio between the two r.t.v. shallnot exceed 1'6 and lowest r.t.v. shall not be less than '05 dB/m.4.4 Repeatability - Detectors numbered 2 and numbered 14 shallbe tested. The r.t. v. of each detector shall be measured 6 timeskeeping a time interval of 30 minutes between two successive measurementsand making the tunnel and detector free from smoke before every

.The detail drawings, of each component with type of material to be indicated oneach design ( sle 6.5 ).6

IS : 11360 - 19854. PERFORMANCE TEST AND CRITERIA FOR CONFORMITY4.0 A sample of 15 numbers of detectors of each design* selectedrandomly from production of not less than 200 shall be used for testingand shall be numbered as 1 to 15. The tests (one or more) on thedetectors shall be carried out in the order given in test schedule given.inAppendix A according to methods given in 4.1 to 4.18. All the tests aretype tests which cover the, production of 10 000 members. The detectorsshall pass all the tests. '4.1 Directional Dependence - A randomly choosen detector from thesample shall be mounted in the testing tunnel in its normal operatingposition ~ n d with a random orientation with respect to flow direction ofthe smoke. Its response threshold value ( r.t.v. ) shall be measured inaccordance with Appendix B. It shall then be rotated by 45 about itsvertical axis and its r.t.v. shall again be measured. Thus 8 measurements of its r. t. v. in 8 orientations shall be recorded so that rotation ofthe detector about vertical axis js complete. The ratio of highest r.t.v.and lowest l'.t.v. shall not exceed 1-6 and the lowest r.t.v. shall be notless than '05 dB/m.

NOTE - The direction of highest r.t.v. is the least favourable orientation and thedirection of lowest r.t.v. is the most favourable orientation of the detector. In thefollowing tests where determination of r.t.v. is required on the tunnel mounteddetector, it shall be made using the least favourable orientation of the detector:4.2 Reproducibility and, Optimal Sensitivity - The r.t.v. of allthe detectors of the sample shall be measured as in Appendix B for theleast favourable orientation. Detectors shall be graded in order ofincreasing r.t.v. number 1 having lowest r.t.v. and 15 number havinghighest r.t.v. The ratio of highest r.t.v. and lowest r.t.v. shall notexceed 1'6 and the lowest r.t.v. shall not be less than '05 dB/m.4.3 Stability - Detectors numbered 3 shall be mounted ill the tunneland left energized. Two measurements ofr.t.v. shall be made, accord-ing to Appendix B after one day of energization. The detector shall bereset and energization restored immediately after the measurement;second measurement ofr.t.v. shall be taken after 10 days of energization. Other than the first 2 minutes of energization, the detector shallnot give fire or fault alarm and the ratio between the two r.t.v. shallnot exceed 1'6 and lowest r.t.v. shall not be less than '05 dB/m.4.4 Repeatability - Detectors numbered 2 and numbered 14 shallbe tested. The r.t. v. of each detector shall be measured 6 timeskeeping a time interval of 30 minutes between two successive measurementsand making the tunnel and detector free from smoke before every

.The detail drawings, of each component with type of material to be indicated oneach design ( sle 6.5 ).6


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IS : 11360 - 1985measurement according to Appendix D. Detector shall be resetimmediately after measurement ofr.t.v. For each detector, ratio betweenits highest r.t.v. and lowest r.t.v. shall not exceed 1'6

. NOTE - For both the detectors averilge value ofr.t.v. shall be calculated on th ebasis of this test and designated as M2 and Mu.4.5 Endurance - Detectors numbered 4. 12 and 13 shall be tested forendurance. The tests shall be conducted k ~ e p i n g detectors energized intheir normal operating conditions. During the test carried out as follows,the detectors shall be kept in a room free of smoke and air-draughts:

a) Power supply of detector numbered 4 shall be interrupted 50times with interruption interval of 1s and interval of lOs betweensuccessive interruptions. Where applicable, engagement anddisengagement of base plate and removal and replacement ofcover shall be made.b) Detector numbered 1'2 shall be subjected to I 000 power interruption cycles of 5s shall be repeatedat a rate not exceeding 6 cpm.There shall be no electrical and mechanical malfunctioning of thedetector. For each detector the r.t.v. measured following one testaccording to Appendix B and its r.t.v. measured under 4.2 shall notdiffer by a factor greater than 1'6.

4.6 Supply Voltage Variation - Detector numbered 2 (.;W2 ) shall betested according to Appendix B. Where upper and lower limit of supplyvoltage are prescribed, the r. t. v. shall be determined at both the limits.I f only one nominal value of supply voltage is given, r.t.v. shall bemeasured first by reducing the voltage by 15 percent and then by raisingthe voltage by 10 percent of the nominal value. Neither reduced voltaget.t.v. nor raised voltage r.t.v. shall differ by a factor greater than1'6 from .M'2' .4.7 Insulation Resistance - Detector numbered 9 shall be mountedin its normal fastening on a metal plate of at least 2 mm thickness andhaving surface area at least 5 times of the mounting source of the detector.With the plate shorted to ground terminal of the source, a dc voltageshall be applied between the plate and terminals of the detectors whichare interconnected. Starting from zero volt, the voltage shall be appliedat a rate of 100 Vis to a maximum of 500 10 volts dc. The maximumvoltage shall remain applied for 1 minute. Insulation resistance shaH

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IS : 11360 1985then be determined. Thereafter it shaII be subjected to the followingclimatic conditions for 10 days, care shall be taken against watercondensation or mist formation on the detector:

Temperature = 42 2DCRH = 92 3 percentAfter the conditioning, the detector shall be kept under roomcondition for 1 hour. Insulation r e s i s t a n c ~ shall be measured again asdescribed above. The detector shall not show insulation resistance lessthan 10 M ohm in the first measurement and not less than 1 M ohm insecond measurement.

4.8 Yibrati()D - Detector numbered 5 shall be tested as inIS ': 2'175-1977'. Detector shall not emit a fire or fault signal duringand after the test and the r.t. v. measured following the test according toAppendix:S and its r.t.v. measured under 4.2 shall not differ by afactor greater than 16 and no mechanical damage/failure shall occur.4.9 Shock - Detector numbered 6 shall be subjected to shock as inIS : 2175-1977*. Detector shall not initiate a fire and fault signal asa result of shock and its r.t.v. measured after the test according toAppendix B and the r,t.v. measured as in 4.2 shall not differ by factorgreater than 16.4.10 High TeD1perature - Detector numbered 2 shall be mounted inthe tunnel in its normal operating conditions with its normal fastening.The temperature of air flow in the tunnel shall be raised to 55 1DC ata rate not exceeding 1DC/min. The maximum level of the temperatureshall be maintained for 3 h, and then r.t. v. shall be measured accordingto Appendix B. Detector shall not initiate fire or fault signal duringthe test and the r.t.v. measured at elevated temperature shall not differby a factor greater than 16 from M2 ( see 4.4 ).4.11 Low TeD1perature - Detector numbered 14 shall be put inside asuitable chamber/enclosure and connected to its control and indicatingequipment. The air temperature in the chamber shall then be reducedto a minimum of 0 1DC at a rate not exceeding 1DC per/min. Thedetector shaII be kept in the condition of minimum temperature for 1 hto allow its temperature to stabilize. Care shall be taken against formation of any condensation or mist on the detector. After 3 h stabil ization, detector shall be taken out and kept at room conditions for 5 to6 h. Following the conditioning its rt.v. shall be measured in accor-dance with Appendix B. During exposure to depressed temperature

*Specification for heat sensitive fire detectors for use in automatic electrical firealarm system (first revision).8

IS : 11360 1985then be determined. Thereafter it shaII be subjected to the followingclimatic conditions for 10 days, care shall be taken against watercondensation or mist formation on the detector:

Temperature = 42 2DCRH = 92 3 percentAfter the conditioning, the detector shall be kept under roomcondition for 1 hour. Insulation r e s i s t a n c ~ shall be measured again asdescribed above. The detector shall not show insulation resistance lessthan 10 M ohm in the first measurement and not less than 1 M ohm insecond measurement.

4.8 Yibrati()D - Detector numbered 5 shall be tested as inIS ': 2'175-1977'. Detector shall not emit a fire or fault signal duringand after the test and the r.t. v. measured following the test according toAppendix:S and its r.t.v. measured under 4.2 shall not differ by afactor greater than 16 and no mechanical damage/failure shall occur.4.9 Shock - Detector numbered 6 shall be subjected to shock as inIS : 2175-1977*. Detector shall not initiate a fire and fault signal asa result of shock and its r.t.v. measured after the test according toAppendix B and the r,t.v. measured as in 4.2 shall not differ by factorgreater than 16.4.10 High TeD1perature - Detector numbered 2 shall be mounted inthe tunnel in its normal operating conditions with its normal fastening.The temperature of air flow in the tunnel shall be raised to 55 1DC ata rate not exceeding 1DC/min. The maximum level of the temperatureshall be maintained for 3 h, and then r.t. v. shall be measured accordingto Appendix B. Detector shall not initiate fire or fault signal duringthe test and the r.t.v. measured at elevated temperature shall not differby a factor greater than 16 from M2 ( see 4.4 ).4.11 Low TeD1perature - Detector numbered 14 shall be put inside asuitable chamber/enclosure and connected to its control and indicatingequipment. The ai r temperature in the chamber shall then be reducedto a minimum of 0 1DC at a rate not exceeding 1DC per/min. Thedetector shaII be kept in the condition of minimum temperature for 1 hto allow its temperature to stabilize. Care shall be taken against formation of any condensation or mist on the detector. After 3 h stabil ization, detector shall be taken out and kept at room conditions for 5 to6 h. Following the conditioning its rt .v. shall be measured in accor-dance with Appendix B. During exposure to depressed temperature

*Specification for heat sensitive fire detectors for use in automatic electrical firealarm system (first revision).8


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IS : 11360 1985detector shall not release fire or fault alarm and the r.t.v. measuredfollowing the test shall not differ by a factor greater than 1'6 ( see 4.4 ).4.12 Humidity - Detector nu mbered 7 shall be kept inside a suitablehumidity/climatic chamber and connected to its control and indicatingequipment. Following climatic conditions shall be created inside thetest chamber:

TemperatureRHDuration ofexposure

= 30 2C= 85 5 percent= 7 days

Care shall be taken against formation of mist and condensation onthe detector. Detector shall be transferred to the tunnel within 1 h ofremoval from the chamber and jts r.t. v. measured according toAppendix B. The r.t.v. measured after the exposure and r.t.v. of thedetector in 4.2 shaH not differ by a factor greater than 1'6 and no fire orfault signal shall be released.'4.13 Air MovemeDt..,- The r. t .v.of detector numbered 14 shall bedetermined according to Appendix B increasing the air. flow i n the tunnelto velocity o f l 0-2 mjs using the least and most favourable orientations of the detectors. To ' investigate operation .of the detector underair breeze, the tunnel mounted detector shall be subjected to an aerosolfree air flow at a velocity of 5 0'5 mls and then to a gust' lasting 2sat a velocity of,8 08.m/s . Neither of the r.t.v. measured at airvelocity of 1 mls shaH not differ by a factor greater than 1'6 from M4and no fire or fault signal shaH be emitted ( see 4.4 ).4.14 Corrosion -.:.. Detector numbered 8 shaH be mounted unenergizedwith its norinal fastening in. the apparatus described in IS: 2175-1977* and left for 24 h iri the corrosive atmosphere produced foIIowingthe procedure and conditions described therein. I t shaH then be takenout and conditioned for 7 days.in a ,climate given below and its r.t.v.measured according to Appendix B.

Temperature = 25 X 3CRH = 60 5 percentThe r.t.v. measured after corrosion and r.t.v. of the detectormeasured in 4.2 shall not differ by a factor greater than 1 6.

Specification for heat sensitive fire detectors for use in automatic electrical firealarm system (first "vision).9

IS : 11360 1985detector shall not release fire or fault alarm and the r.t.v. measuredfollowing the test shall not differ by a factor greater than 1'6 ( see 4.4 ).4.12 Humidity - Detector nu mbered 7 shall be kept inside a suitablehumidity/climatic chamber and connected to its control and indicatingequipment. Following climatic conditions shall be created inside thetest chamber:

TemperatureRHDuration ofexposure

= 30 2C= 85 5 percent= 7 days

Care shall be taken against formation of mist and condensation onthe detector. Detector shall be transferred to the tunnel within 1 h ofremoval from the chamber and jts r.t. v. measured according toAppendix B. The r.t.v. measured after the exposure and r.t.v. of thedetector in 4.2 shaH not differ by a factor greater than 1'6 and no fire orfault signal shall be released.'4.13 Air MovemeDt..,- The r. t .v.of detector numbered 14 shall bedetermined according to Appendix B increasing the air. flow i n the tunnelto velocity o f l 0-2 mjs using the least and most favourable orientations of the detectors. To ' investigate operation .of the detector underair breeze, the tunnel mounted detector shall be subjected to an aerosolfree air flow at a velocity of 5 0'5 mls and then to a gust' lasting 2sat a velocity of,8 08.m/s . Neither of the r.t.v. measured at airvelocity of 1 mls shaH not differ by a factor greater than 1'6 from M4and no fire or fault signal shaH be emitted ( see 4.4 ).4.14 Corrosion -.:.. Detector numbered 8 shaH be mounted unenergizedwith its norinal fastening in. the apparatus described in IS: 2175-1977* and left for 24 h iri the corrosive atmosphere produced foIIowingthe procedure and conditions described therein. I t shaH then be takenout and conditioned for 7 days.in a ,climate given below and its r.t.v.measured according to Appendix B.

Temperature = 25 X 3CRH = 60 5 percentThe r.t.v. measured after corrosion and r.t.v. of the detectormeasured in 4.2 shall not differ by a factor greater than 1 6.

Specification for heat sensitive fire detectors for use in automatic electrical firealarm system (first "vision).9


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IS : 11360 19854.15 Am.bient Light - Detector numbered 9 shall be subjected to 20,cycles of light intensity produced by a ISO watt incandescent lamppla;ced at a distance of 0'5 metres. Each cycle shall consist of 10 s 'on'and. 5 s"off' conditions. On completion of cycles illumination shallremain directed on to the detector for 10 min. The detector then shallbe pl


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IS : 11360 - 1985Detector may raise a fire or fault signal. I f not, the detector shallbe mounted in the tunnel and its r.t.v. measured in Appendix B. I fr.t.v. is found to have been increased, the increa'ie shall not be greaterthan a factor of 1'6 from its r.t.v. measured under 4.2. The r.t.v. may

reduce to any limit.4.18 Fire Test - Detectors numbered 1,2,14 and 15 shall be subjectedto four test fires specified in 4.18.1 to 4.18.4, each fire being lit once in thecentre of the floor of thf:' test room described in 4.18.1. The detectorsand the optical density ( OD ) meter ( see Appendix E ) shall be positionedon the ceiling of the room as in 4.18.1. A clearance of 4 m shall bemaintained between base/bottom of the combustible and the ceiling.Before starting a test fire, the room shall be cleared of smoke. Detectorsand OD meter: shall be energized and kept in their normal operatingconditions. Time shall be counted from the moment of ignition of atest fire and build up of optical density shall be recorded every 20 s untiloptical density crosses the value 2'0 dB/m or it$ maximum is attained forsufficient time. From this data the t ~ m p o r a l mean value of opticaldensity shall be calculated over an interval of 60 s. The temporal meanvalues of OD shall be plotted against time and the plot shall be referredto as 'profile curve' of the test fire.4.18.1 Test Room - The test room shall have following dimensions:

Lenth ( L ) 7 m Min, 11 m MaxWidth ( W ) 7 m Min, 8 m MaxCeiling height (H ) 4 m Min, 4'8 m MaxCeiling shall be flat and smooth with no physical obstruction. Allopenings in the room (doors, windows, ventilators, smoke extractors,etc) shall be kept closed during test to make it free from draughts.Detectors and OD meter shall be mounted using their normal fixings,on the ceiling of the room at a distance of 3 m from the ceiling centre( CC). The angle between longitudinal axis of the ceiling and theline joining the detector to CC shall not exceed 30.. OD meter shallbe mounted on the longi tudinal axis of the ceiling at a distance of 3 mfrom CC ( see Fig. 1 ).

4.18.2 Fast Burning Wood Fire - Fiftyfour sticks made of commonlyused teak wood and size specified below shal l be stacked in the formof a rectangular crib shown in Fig. 2. The specifications of sticks' andcrib shall be:Stick sizeConditioningSpacing betweensticks

20 X 20 X 250 mmSticks shall be conditioned for 72 h in an aircirculating oven at 50C26mm

11

IS : 11360 - 1985Detector may raise a fire or fault signal. I f not, the detector shallbe mounted in the tunnel and its r.t.v. measured in Appendix B. I fr.t.v. is found to have been increased, the increa'ie shall not be greaterthan a factor of 1'6 from its r.t.v. measured under 4.2. The r.t.v. mayreduce to any limit.4.18 Fire Test - Detectors numbered 1,2,14 and 15 shall be subjectedto four test fires specified in 4.18.1 to 4.18.4, each fire being lit once in thecentre of the floor of thf:' test room described in 4.18.1. The detectorsand the optical density ( OD ) meter ( see Appendix E ) shall be positionedon the ceiling of the room as in 4.18.1. A clearance of 4 m shall bemaintained between base/bottom of the combustible and the ceiling.Before starting a test fire, the room shall be cleared of smoke. Detectorsand OD meter: shall be energized and kept in their normal operatingconditions. Time shall be counted from the moment of ignition of atest fire and build up of optical density shall be recorded every 20 s untiloptical density crosses the value 2'0 dB/m or it$ maximum is attained forsufficient time. From this data the t ~ m p o r a l mean value of opticaldensity shall be calculated over an interval of 60 s. The temporal meanvalues of OD shall be plotted against time and the plot shall be referredto as 'profile curve' of the test fire.

4.18.1 Test Room - The test room shall have following dimensions:Lenth ( L ) 7 m Min, 11 m MaxWidth ( W ) 7 m Min, 8 m MaxCeiling height (H ) 4 m Min, 4'8 m MaxCeiling shall be flat and smooth with no physical obstruction. Allopenings in the room (doors, windows, ventilators, smoke extractors,etc) shall be kept closed during test to make it free from draughts.Detectors and OD meter shall be mounted using their normal fixings,on the ceiling of the room at a distance of 3 m from the ceiling centre( CC). The angle between longitudinal axis of the ceiling and theline joining the detector to CC shall not exceed 30.. OD meter shallbe mounted on the longi tudinal axis of the ceiling at a distance of 3 mfrom CC ( see Fig. 1 ).

4.18.2 Fast Burning Wood Fire - Fiftyfour sticks made of commonlyused teak wood and size specified below shall be stacked in the formof a rectangular crib shown in Fig. 2. The specifications of sticks' andcrib shall be:Stick sizeConditioningSpacing betweensticks

20 X 20 X 250 mmSticks shall be conditioned for 72 h in an aircirculating oven at 50C26mm

11


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IS : 11360 1985Number ofsticks per layerNumber of layersWater contentIgnition

69Not exceeding 15 percent10 ml of methyl alcho1 in 40 mm diameter dishat the centre of the base of the crib. The twomiddle sticks of the bottom layer shall be omi-tted to allow the insertion of the dish.

,,'" ....I ..... , Tw~ " l

J..o!.>------- L - - - - - ~ . IFIG. POSITION OF DETECTORS AND OD METER

FIG. 2 CRIB12

IS : 11360 1985Number ofsticks per layerNumber of layersWater contentIgnition

69Not exceeding 15 percent10 ml of methyl alcho1 in 40 mm diameter dishat the centre of the base of the crib. The twomiddle sticks of the bottom layer shall be omitted to allow the insertion of the dish.

,,'" ....I ..... , Tw~ " l

J..!oo------- L - , - - - ~ . IFIG. POSITION OF DETECTORS AND OD METER

FIG. 2 CRIB12


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IS : 11360 1985Let T' be the point on the time axis of the profile curve of the testfire at which optical density is 0'80 dB/m and above which it is greaterthan or equal to this value. A line drawn parallel to time axis and atpoint where OD is equal to 0'80 dB/m shall help locate T. Let T1 be

the time of a detector's operation. Then T1 shall be less than T + 20 sfor each detector.4.18.3 Burning Plastic Fire - Three mats of soft polyurethane foamhaving a density of 20 kg/m3 approximately shall be placed on a flataluminium foil whose edges are folded up. The mats shall not 'containany fire inhibitant. The dimensions of each mat shall be 0'5 X 0'4 X 20 mand shall be placed one over the other to form a pile. The pile shallbe ignited by a small fire at one corner.

Let T' be the point on the time axis of the profile curve of the testfire at which optical density is 1'0 dB/m and above which it is greaterthan 9r equal to this value. A line drawn parallel to time axis and atpoint where OD is equal to 1'0 dB/m shall help locate T. Let T1 bethe time of a detector's operation. Then T1 shall be less than T' + 20 sfor each detector.

4.18.4 Liquid Hydrocarbon Fire - Fifty millilitres of petroleum spirit/petrol shaH be burnt in a square metal tray having base area of 0'01 m2and wall height of 20-30 mm.Let T' be the point on the time axis of the profile curve of the test

fire at which optieal density is 1'0 dB/m and above which it is greaterthan or equal to this value. A line drawn parallel to time axis and atpoint where OD is equal to 1'0 dB/m shall help locate T. Let T1 bethe time of a detector's operation. Then T 1 shall be less than T + 20 sfor each detector.4.18.5 Slow Burning Wood Fire - The test fire is described in 4.18.1except for:

Spacing between sticksNumber of sticks per layerNumber of layers

12 mm8

11Let T' be the point 'on the time axis of the profile curve of the testfire at which optical density is 1'1 dB/m and above which it is greaterthan or equal to this value. A line drawn parallel to time axis at ODequal to 1'1 dB/m shall help locate T. Let T1 be the time of adetector's operation. Then T1 shall be less than T + 20 s for eachdetector.

13

IS : 11360 1985Let T' be the point on the time axis of the profile curve of the testfire at which optical density is 0'80 dB/m and above which it is greaterthan or equal to this value. A line drawn parallel to time axis and atpoint where OD is equal to 0'80 dB/m shall help locate T. Let T1 be

the time of a detector's operation. Then T1 shall be less than T + 20 sfor each detector.4.18.3 Burning Plastic Fire - Three mats of soft polyurethane foamhaving a density of 20 kg/m3 approximately shall be placed on a flataluminium foil whose edges are folded up. The mats shall not 'containany fire inhibitant. The dimensions of each mat shall be 0'5 X 0'4 X 20 mand shall be placed one over the other to form a pile. The pile shallbe ignited by a small fire at one corner.

Let T' be the point on the time axis of the profile curve of the testfire at which optical density is 1'0 dB/m and above which it is greaterthan 9r equal to this value. A line drawn parallel to time axis and atpoint where OD is equal to 1'0 dB/m shall help locate T. Let T1 bethe time of a detector's operation. Then T1 shall be less than T' + 20 sfor each detector.

4.18.4 Liquid Hydrocarbon Fire - Fifty millilitres of petroleum spirit/petrol shaH be burnt in a square metal tray having base area of 0'01 m2and wall height of 20-30 mm.Let T' be the point on the time axis of the profile curve of the test

fire at which optieal density is 1'0 dB/m and above which it is greaterthan or equal to this value. A line drawn parallel to time axis and atpoint where OD is equal to 1'0 dB/m shall help locate T. Let T1 bethe time of a detector's operation. Then T 1 shall be less than T + 20 sfor each detector.4.18.5 Slow Burning Wood Fire - The test fire is described in 4.18.1except for:

Spacing between sticksNumber of sticks per layerNumber of layers

12 mm8

11Let T' be the point 'on the time axis of the profile curve of the testfire at which optical density is 1'1 dB/m and above which it is greaterthan or equal to this value. A line drawn parallel to time axis at ODequal to 1'1 dB/m shall help locate T. Let T1 be the time of adetector's operation. Then T1 shall be less than T + 20 s for eachdetector.

13


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IS : 11360 - 19855. MARKING5.1 Each detector shall be marked to indicate its type, power supplyrequirements ( upper and lower limit ), date of manufacture, maximumperiod between two successive services or inspections, name of themanufacturer. Ionization detectors shall be invariably marked for theexistence radioactivity inside and its strength and type of SOurce.

5.1.1 The product may also be marked with Standard Mark.

5.L,2 The use of the Standard 'Mark is governed by the provisions of the Bureauof Iffdian Standards Act, 1986 and the Rules and Regulations made thereunder.The details of conditions under which the licence for the use of Standard Markmay be granted to manufactures or producers may be obtained from the Bureauof Indian Standards.6. DATA AND INSTRUCTIONS6.1 Instructions and technical specification for all accessories requiredto be connected to the detector and effecting its operation shall besupplied on or with the detector to ensure that the detector operate .undercorrect electrical characteristics, is connected to specified equipment(s)through permissible cables and inter-connections only.6.2 Wiring diagrams for understanding the installation of detectorsshowing at least two detectors in connection, and instructions for testingand maintenance shall also be supplied with the detector.6.3 Procedure to be followed for disposal of an ionization detector shallbe invariably stated and supplied with the detector ( see 0.7 ).6.4 Description of circuit operation under normal alarm and faultconditions and to detectors in dismantledJunassembled form shall besubmitted.6.5 Engineering drawings together with other relevant details of designand material(s) used shall be mbmitted which define the product.6.6 Whether during testing, power shall be supplied to the detector forwarm up and the period to be observed.

14

IS : 11360 - 19855. MARKING5.1 Each detector shall be marked to indicate its type, power supplyrequirements ( upper and lower limit ), date of manufacture, maximumperiod between two successive services or inspections, name of themanufacturer. Ionization detectors shall be invariably marked for theexistence radioactivity inside and its strength and type of SOurce.

5.1.1 The product may also be marked with Standard Mark.

5.L,2 The use of the Standard 'Mark is governed by the provisions of the Bureauof Iffdian Standards Act, 1986 and the Rules and Regulations made thereunder.The details of conditions under which the licence for the use of Standard Markmay be granted to manufactures or producers may be obtained from the Bureauof Indian Standards.6. DATA AND INSTRUCTIONS6.1 Instructions and technical specification for all accessories requiredto be connected to the detector and effecting its operation shall besupplied on or with the detector to ensure that the detector operate .undercorrect electrical characteristics, is connected to specified equipment(s)through permissible cables and inter-connections only.6.2 Wiring diagrams for understanding the installation of detectorsshowing at least two detectors in connection, and instructions for testingand maintenance shall also be supplied with the detector.6.3 Procedure to be followed for disposal of an ionization detector shallbe invariably stated and supplied with the detector ( see 0.7 ).6.4 Description of circuit operation under normal alarm and faultconditions and to detectors in dismantledJunassembled form shall besubmitted.6.5 Engineering drawings together with other relevant details of designand material(s) used shall be mbmitted which define the product.6.6 Whether during testing, power shall be supplied to the detector forwarm up and the period to be observed.

14


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IS : 11360 1985APPENDIX A

( Clause 4.0 )TEST SCHEDULE

Tests Clause No. Detector Number( marked as mentioned in 4.2 )General requirements 3 All DetectorsDirectional dependence 4.1 One detector randomly selected froITi sample1 2 3456789 0 1 12 13 14 15Reproducibility and 4.2 x x x x x x x x X x x x x x xoptimal sensitivityStability 4.3 xRepeatability 4.4 x x(M2 M14Endurance 4.5 :lI x xSupply voltage 4.6 xvariationInsulation resistance 4.7 xVibration 4.8 xShock 4.9 xHigh temperature 4.10 xLow temperature 4.11 xHumidity 4.12 xAir movement 4.13 xCorrosion 4.14 xAmbient light 4.15 xTransients 4.16 xDust 4.17 xFull scale fires 4.18 x pc x x

15

IS : 11360 1985APPEND IX A

( Clause 4.0 )TEST SCHEDULE

Tests Clause No. Detector Number( marked as mentioned in 4.2 )General requirements 3 All DetectorsDirectional dependence 4.1 One detector randomly selected froITi sample1 2 3456789 0 1 12 13 14 15Reproducibility and 4.2 x x ;x x x x x x Ix x x x x x xoptimal sensitivityStability 4.3 xRepeatability 4.4 x x(M2 M14Endurance 4.5 :l< x xSupply voltage 4.6 xvariationInsulation resistance 4.7 PcVibration 4.8 xShock 4.9 IxHigh temperature 4.10 xLow temperature 4.11 xHumidity 4.12 xAir movement 4.13 xCorrosion 4.14 xAmbient light 4.15 xTransients 4.16 xDust 4.17 xFull scale fires 4.18 x Pc x x

15


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IS : 11360 - 1985APPENDIX B( Clauses 4.1 to 4.17 )

RESPONSE THRESHOLD VALUE (r.t.v.)B-1. The response threshold value ( r.t.v. ) shall be measured in a windtunnel specified in Fig. 6 of IS : 9972-1981*. The air velocity in thetunnel shall be 0'2 '05 mls and air temperature shall be 25 50unless otherwise required in specific tests. The detector shall be moun-ted on the top horizontal section of the tunnel using its normal fastening.Unless otherwiFe ~ p e c i f i e d in the test the detector shall be mounted in itsleast favourable orientation with respect to air flow as determined bydirectional dependenae test speoified in 4.1. Prior to every measurementof _r.t.V. the tunnel and the detector shall be clear of aerosols. Thedetector shall be powered by connecting i t to its control and indicatingequipment or eClJ.uivalent source of supply. A warm up period if specified, shall be observed before starting measurement(s). The smoke shallbe generated as specified in B-2. At the moment the detector initiatealarm, density of s m o ~ e shall be measured using smoke measuringinstrument speqified in Appendix C and recorded as the r.t. v. of thedetector. The optical density meter shan be kept close to the detector.B-2. A circular hot plate or equal electric heating arrangement shall beprovided in the heating section of the tuimel and circular filter papers( one over the other) such as Whatl'nan No.2 or similar ones weighingbetween 80 to UO g per m2 shall be placed on the plate. The diameterof the bundle of the papers shall not exceed the diameter of the plate.Smoke shall be generated by initiating and sustaining smoulderingof the papers. The amount of the papers used and the temperature ofthe heater $haU be adjusted so that smoke is generated by smouldering/charring of papers at a slow pace. Optical density ( absorbance index)o f smoke shan increase at a rate not exceeding 0'2 dB/m per minute to amaximum value of at least 1'5 dB/ll1 when measured according tomethod given in Appendix D using readings of the optical densitymeter. All measurements of r.t.v. shall be completed by one type offilter paper. No parameter/specification of the paper (its type; thickness, weight, etc). shall be altered during tests. Rate of increase ofoptical density of smoke, orice selected initially, shall not varysignificantly during tests.

*Specification for automatic sprinkler heads.16.

IS : 11360 - 1985APPENDIX B( Clauses 4.1 to 4.17 )

RESPONSE THRESHOLD VALUE (r.t.v.)B-1. The response threshold value ( r.t.v. ) shall be measured in a windtunnel specified in Fig. 6 of IS : 9972-1981*. The air velocity in thetunnel shall be 0'2 '05 mls and ai r temperature shall be 25 50unless otherwise required in specific tests. The detector shall be moun-ted on the top horizontal section of the tunnel using its normal fastening.Unless otherwiFe ~ p e c i f i e d in the test the detector shall be mounted in itsleast favourable orientation with respect to air flow as determined bydirectional dependenae test speoified in 4.1. Prior to every measurementof _r.t.V. the tunnel and the detector shall be clear of aerosols. Thedetector shall be powered by connecting i t to its control and indicatingequipment or eClJ.uivalent source of supply. A warm up period if specified, shall be observed before starting measurement(s). The smoke shallbe generated as specified in B-2. At the moment the detector initiatealarm, density of s m o ~ e shall be measured using smoke measuringinstrument speqified in Appendix C and recorded as the r.t. v. of thedetector. The optical density meter shan be kept close to the detector.B-2. A circular hot plate or equal electric heating arrangement shall beprovided in the heating section of the tuimel and circular filter papers( one over the other) such as Whatl'nan No.2 or similar ones weighingbetween 80 to UO g per m2 shall be placed on the plate. The diameterof the bundle of the papers shall not exceed the diameter of the plate.Smoke shall be generated by initiating and sustaining smoulderingof the papers. The amount of the papers used and the temperature ofthe heater $haU be adjusted so that smoke is generated by smouldering/charring of papers at a slow pace. Optical density ( absorbance index)o f smoke shan increase at a rate not exceeding 0'2 dB/m per minute to amaximum value of at least 1'5 dB/ll1 when measured according tomethod given in Appendix D using readings of the optical densitymeter. All measurements of r.t.v. shall be completed by one type offilter paper. No parameter/specification of the paper (its type; thickness, weight, etc). shall be altered during tests. Rate of increase ofoptical density of smoke, orice selected initially, shall not varysignificantly during tests.

*Specification for automatic sprinkler heads.16.


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APPENDIX C( Clause B-1 )

IS : 11360 - 1985

SMOKE MEASURING INSTRUMENTC-l. A smok.e measuring instrument employed shall be stable with timeand with changes of environmental conditions which might occur bet-ween two measurements It shall give a reading that is directlyproportional to smoke concentration. This reading may be obtaineddirectly or by mathematical manipulation of the meter's output. Fortesting of detectors based on 'light obscuration' principle the meter isdescribed in Appendix E. The ionization detector shall be testedemploying ionization chamber as the smoke measuring device providedconditions of linearity and stability are met. Similar ly a scatering typesmoke detector shall be tested using a 'scatering chamber' as the smokemeasuring device provided the condition of linearity and stability aremet, when no ionization chamber or smoke scatering chamber areavailable for testing these two type of detectors, the meter described inAppendix E shall be employed.

APPENDIX D( Clause B-2 )

OPTICAL DENSITY OF SMOKE0-1. The meter detailed in Appendix E shall be employed for themeasurement of the optical density. The optical density of smoke isdefined as:

OD ( in dB/m) = lOll loglO la/Iewhere = the length of the light path affected by the smoke, m;Ie = light intensity seen/measured by the sensor with smoke;and10 = the light seen/measured by the sensor without smoke.

17

APPENDIX C( Clause B-1 )

IS : 11360 - 1985

SMOKE MEASURING INSTRUMENTC-l. A smok.e measuring instrument employed shall be stable with timeand with changes of environmental conditions which might occur bet-ween two measurements It shall give a reading that is directlyproportional to smoke concentration. This reading may be obtaineddirectly or by mathematical manipulation of the meter's output. Fortesting of detectors based on 'light obscuration' principle the meter isdescribed in Appendix E. The ionization detector shall be testedemploying ionization chamber as the smoke measuring device providedconditions of linearity and stability are met. Similar ly a scatering typesmoke detector shall be tested using a 'scatering chamber' as the smokemeasuring device provided the condition of linearity and stability aremet, when no ionization chamber or smoke scatering chamber areavailable for testing these two type of detectors, the meter described inAppendix E shall be employed.

APPENDIX D( Clause B-2 )

OPTICAL DENSITY OF SMOKE0-1. The meter detailed in Appendix E shall be employed for themeasurement of the optical density. The optical density of smoke isdefined as:

OD ( in dB/m) = lOll loglO la/Iewhere = the length of the light path affected by the smoke, m;Ie = light intensity seen/measured by the sensor with smoke;and10 = the light seen/measured by the sensor without smoke.

17


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IS : 11360 1985APPENDIX E( Clauses C-l and D-l )

OPTICAL DENSITY METEREl. The schematic diagram of the optical density meter is given inFig. 3. It shall essentially consist of a light source ( lamp) to give auniform and constant beam of light and a light sensor placed at somedistance from the source in the line of the beam to receive light outputfrom the source. To obtain light, beam of uniform density lamp isused in conjunction with collimating lenses Ll and L 2 Collimating lensesLa and L4 shaI1 be used with sensor. The distance between L2 and Lashall not exceed 1'1 m. The aperture of the diaphragms Dl and D2 andthe-focal lengths of L2 and Lsshall be such that light scattered by morethan 50 from its original path shall not be received by the sensor.

COLLIMATINGlENS,-l2FIG. 3 SCHEMATIC DIAGRAM OF OPTICAL DENSITY METER

E2. LIGHT SENSORE-2.1 A photovoltaic (selenium barrier layer type) cell of approximately25 mm diameter active area shall be used as the sensor. The spectoralresponse of the photocell shall be. as closed as possible to the response ofhuman eye. Its range shall be at least from 350 nanometre to atleast 660 nanometre with a peak between 530 and 580 nanometre.E3. LIGHT SOURCEE3.1 A tungsten filament automotive ( or auto) lamp shall be used as alight source and shall be energized from a constant voltage and constantcurrent source. The operating voltage selected shall be approximatelyhalf of its rated voltage to get a light beam of uniform intensity.

Photocell shall give an output that is directly proportional to smokeconcentration.18

IS : 11360 1985APPENDIX E( Clauses C-I and D-l )

OPTICAL DENSITY METEREl. The schematic diagram of the optical density meter is given inFig. 3. It shall essentially consist of a light source ( lamp) to give auniform and constant beam of light and a light sensor placed at somedistance from the source in the line of the beam to receive light outputfrom the source. To obtain light, beam of uniform density lamp isused in conjunction with collimating lenses Ll and L 2 Collimating lensesLa and L4 shall be used with sensor. The distance between L2 and Lashall not exceed 1'1 m. The aperture of the diaphragms Dl and D2 andthe-focal lengths of L2 and Lsshall be such that light scattered by morethan 50 from its original path shall not be received by the sensor.

COLLIMATINGlENS,-l2FIG. 3 SCHEMATIC DIAGRAM OF OPTICAL DENSITY METER

E2. LIGHT SENSORE-2.1 A photovoltaic (selenium barrier layer type) cell of approximately25 mm diameter active area shall be used as the sensor. The spectoralresponse of the photocell shall be. as closed as possible to the response ofhuman eye. Its range shall be at least from 350 nanometre to atleast 660 nanometre with a peak between 530 and 580 nanometre.E3. LIGHT SOURCEE3.1 A tungsten filament automotive ( or auto) lamp shall be used as alight source and shall be energized from a constant voltage and constantcurrent source. The operating voltage selected shall be approximatelyhalf of its rated voltage to get a light beam of uniform intensity.

Photocell shall give an output that is directly proportional to smokeconcentration.18


22/23

IS; 11360 - 1985( Continued from page 2 )

Code of Practice for Fire Fighting Equipments and Fire Alarm SystemSubcommittee, BDC 22 : 4RepresentingonvenerSliRl V. B. NIKAM Municipal Corporation of Greater Bombay( Bombay Fire Brigade ), Bombay

MembersSHRl S. M. DESAISHRI S. K. DHERI State Bank of India, BombayDelhi Municipal Corporation ( Delhi Fire Service ),DelhiSHRI R. K. BHARDWAJ ( Alternate)SHRI EDWIN D'SOUZA Electronic Control Devices, BombaySHRI EUSTACE D'SOUZA ( Alternate)SHRI K. R. EASW ARAN Mather & Platt ( India) Ltd, BombaySHR! S. G. PIH.BHU ( Alternate)FIRE ADVISER Ministry of Home AffairsSHRI A. K. GU.PTA Central Building Research Institute (CSIR) ,RoorkeeSHm P. N. MEHROTRA Institution of Fire Engineers ( India ), New DelhiSHRI B. R. MEHTA ( Alternate)SHRI MOHENDRA PRASHAD Ministry of Defence ( R&D )SHRI F Azum CHAND ( Alternate)SHRlJ. PRAKASH Prakash Security Devices (I), AllahabadSHRl PRAMOD PRAKASH ( Alternate)SHm D. K. PODDAR Tariff Advisory Committee, BombaySHEI B. SAMANTO (Alternate) .SHRI HARISH SALOT Vijay Fire Protection Systems Pvt Ltd, BombaySlim G. K. SHAHI Steelage Industries Ltd, BombaySHRI M. K. IRANI ( Alternate)

19

IS; 11360 - 1985( Continued from page 2 )

Code of Practice for Fire Fighting Equipments and Fire Alarm SystemSubcommittee, BDC 22 : 4RepresentingonvenerSliRl V. B. NIKAM Municipal Corporation of Greater Bombay( Bombay Fire Brigade ), Bombay

MembersSHRl S. M. DESAISHRI S. K. DHERI State Bank of India, BombayDelhi Municipal Corporation ( Delhi Fire Service ),DelhiSHRI R. K. BHARDWAJ ( Alternate)SHRI EDWIN D'SOUZA Electronic Control Devices, BombaySHRI EUSTACE D'SOUZA ( Alternate)SHRI K. R. EASW ARAN Mather & Platt ( India) Ltd, BombaySHR! S. G. PIH.BHU ( Alternate)FIRE ADVISER Ministry of Home AffairsSHRI A. K. GU.PTA Central Building Research Institute (CSIR) ,RoorkeeSH m P. N. MEHROTRA Institution of Fire Engineers ( India ), New DelhiSHRI B. R. MEHTA ( Alternate)SHRI MOHENDRA PRASHAD Ministry of Defence ( R&D )SHRI F Azum CHAND ( Alternate)SHRlJ. PRAKASH Prakash Security Devices (I), AllahabadSHRl PRAMOD PRAKASH ( Alternate)SHm D. K. PODDAR Tariff Advisory Committee, BombaySHEI B. SAMANTO (Alternate) .SHRI HARISH SALOT Vijay Fire Protection Systems Pvt Ltd, BombaySlim G. K. SHAHI Steelage Industries Ltd, BombaySHRI M. K. IRANI ( Alternate)

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