my.ece.nus.edu.sg · Created Date: 4/5/2010 5:18:21 PM

Report Number : GT/|AQ/007-10

Indoor Air QualitY MonitoringIesf Report

l't March 2010

for

DSO National Laboratories20 Science Park Drive

Singapore 118230

TESTED AND PREPARED BY

GESSTECH (S) PTE LTD1. WOODLANDS /NDUSIRIAL PARK E1

#03-02. S/NGAPO RE 757724

Gompany / Facilities

Address

Test Date & Gondition

Report Number

Certified By

Testing Team Leader Ghing Zhi Qiang

INDOOR AIR QUALITY MONITORINGTEST REPORT

Reg No.: CR 152

DSO National Laboratories- Antenna and Scattering Laboratory

(Compact Range)

Engineering Drive 1, E4A-01 -12Singapore 117576

1"t March 2O1O. Under normal / workinq condition

cT/rAQ/o07-10

Gesstech (S) Pte Ltd1 Woodlands Industrial Park E1

#03-02, Singapore 7 577 24

1

^{cEssrEcH--_

-

Reg No.: CR 152

INDOOR AIR QUALITY MONITORINGTEST REPORT

The data presented in this report is an exact record of the rooms and its systemperformance on the day of the test. They were obtained in accordance with theguideline published by Spring Singapore - Code of Practice for Indoor Air Qualityfor Air-Conditioned Building (SS 554 :2009).

The results and information given are certified to be correct and complete, to theextent possible by the equipmenVinstrumentation and procedures used.

Submitted & Certified By:Cesstech (S) Pte Ltd

Seat Yew GhuirgSenior Project Manager

Date: 15th March 2010

Secfio n A

Summary of Guideline

&

Result for IAQ lesf

{rttttilttdf y (rt rtttttfitutttt tttr(r r rtltt nu$trrt t(rtIndoor Air Quality Performance Test at

DSO National Laboratories, Antennas and Scattering Laboratory @NUS (Compact Range)

No Date

Tested

Test Description As Per

Singapore StandardSS 554 : 2009

SamplePoint 1

Gonference Room

SamplePoint 2

Far Field Op Room

SamplePoint 3

Near Field Oo RoomTime TestGonducted

0945 hrs

Time TestConducted

0953 hrs

Time TestGonducted

1000 hrs1

2

3

4

5

o

8

o

10

11

7

0110312010

0110312010

0110312010

0110312010

01t03t2010

01t03t2010

01t03t2010

0110312010

01t03t2010

01t03t2010

011o312010

Carbon Dioxide Test- Average COz Level (ppm)

Garbon Monoxide Test- Average CO Level (ppm)

Formaldehyde Test- Average Level (ppm)

Ozone Test- Average Level (ppm)

Respirable Airborne Particles- Average Level (ug/m")

Volatile Organic GompoundsAyelage Level (ppm)

Total Bacteria Count- Total (cfu/m")

Total Fungal Count- ro!a!(c!{m")

Air Temperature Test- Ayelqgq Jemperature ("C)

Relative Humidity Test- Average Relative Humidity (79)

Air Movement- Average Velocity (m/s)

< 700 above outdoor

<9

< 0.1

< 0.05

<50

<3

< 500

< 500

24 to 26

<70

0.10 to 0.30

487

Not Detected

0.09

Not Detected

5.3

2.2

355

60

25.5

55.9

12 - 0"25

520

Not Detected

Not Detected

Not Detected

1.5

1.5

125

15

..........22i8t:......ii.i.

51.5

0.11 - 0.20

Noteoutdoor carbon Dioxida Level taken at 1g1g hr6 iE 3!5 ppm.

G$Btech (S) Pte Ltd

::ll:::i - nesultexc€ea rccommended valuestapulated bySS 554:2009 Code ofPractice for IAQ for Air-conditioned Bulldinss.

Secfio n B

Iesf Method

&

lnstrument llsed

rsS5TECH

CESSTECH (S) PTE LTDAn ISO 9001:2000 Cedified Company

BS EN /SO 9001:2000 CERr NO; FS 68089

Test Method for tsoe001cERTNo02-2-8442

Garbon Dioxide (GOz) & Garbon Monoxide (GO)

Objective

To monitor and confirm the normal levels of both the carbon dioxide and carbonmonoxide gases that present in the office premises. The concentration level ofcarbon dioxide that present in the air will aid us to pass a judgement on theefficiency of ventilation.

lnstrument Used

TSI IAQ-CALCTM Model 8762 Meter

Method

Carbon dioxide level was measured by the use of a dual wavelength non-dispersive infrared absorption sensor while carbon monoxide was measured usingan electro-chemical detector.

Specification (As per Singapore Standard SS 554 : 2009)

COz Level - < 700 ppm above outdoor

CO Level - .9 ppm

Procedure

1)

2)

3)

The TSI meter is a direct reading instrument.

The meter was positioned at the selected sampling locations at a height ofapproximate 1.2 meter.

COz and CO concentration level was recorded after the reading hadstabilized.

CSSSTECH

CESSTECH (S) PTE LTDAn ISO 9001:2000 Certified Company

BS EN ISO 9001:2000 CERTNO; FS 68089

Test M eth od fo r Fo rma I dehyde/s' e007

'ERT No 02-2-8442

Objective

To measure the levels of formaldehyde vapor present in the office premises andcompare with the Singapore Standard SS 554 : 2009.

Instrument Used

PPM Technology Model Formaldemeter 400 Meter

Method

Formaldehyde content was measured using an electro-chemical detector.


Formaldehyde Level - < 0.1 ppm

Procedure

1)

2)

3)

The Formaldemeter is a direct reading instrument.


Formaldehyde level was recorded after the reading had stabilized.

:Es5TECH


BS EN /SO 9001:2000 CERT NO: FS 68089

Test Method for ozone tsoe001GERTNo02'2-8442

Objective

To measure the levels of ozone present in the office premises and compare withthe Singapore Standard SS 554 : 2009.

Instrument Used

Environmental Sensor Ozone Meter Model Z-1200

Method

ozone content was measured using an electro-chemical sensor.


Ozone Level - < 0.05 ppm

Procedure

1)

2)

3)

The Ozone meter is a direct reading instrument.


Ozone level was recorded after the reading had stabilized.

: jifiECH

CESSTECH (S) PTE LTD

^' i:?,t3i ffittJ,t'iIi'i :J#f "Test Method for

/soe,,lcERrNo02'2-8442

Respi rable Airborne Particles

Objective

To measure the weight of respirable airborne particles present i1 tle office

premises and compJre with the Singapore Standard SS 554 : 2009.

lnstrument Used

GreenTek Aerosol Mass Monitor Model GT-331

Method

The meter employs light scattering principle to size individual particles that pass

through the laser optilal system. The results were then converted into mass

concentration.


Particles Contamination Level - < 50 trg/m'

Procedure

The Aerosol Mass Monitor is a direct reading instrument.

The meter was positioned at the selected sampling locations at a height of

approximate 1.2 meter.

Particulate concentration level was recorded after the reading had

stabilized.

1)

2)

3)

f ssSTECH

CESSTECH (S) PTE LTDo'

i: ?J,3,0 il3t'J,t#Ii?q :,.,$r "/SO 9001 CERTNo 02'2-8442

Test Method forVolatile Organic GomPounds

Objective

To measure the volatile organic compounds content present in the office premises

und "otpare

with the Singapore Standard SS 554 : 2009'

lnstrument Used

MiniRAE2000Handhe|dPlDMonitorMode|PGM-7600

Method

The meter employs a photo-ionization detector to monitor VOC content present in

the atmosPhere'


Volatile Organic Compounds Level - < 3 ppm

Procedure

1) The PID Monitor is a direct reading instrument'

2)ThemeterwaspositionedattheselectedsamplinglocationsataheightofaPProximale 1 '2 meter'

3) Volatile organic compound level was recorded after the reading had

stabilized

5:''TECH

CESSTECH (S) PTE LTDAn ISO 9001:2000 Ceftified Company

BS EN/SO 9001:2000 CERT NO: FS 68089

tS) 9001 CERTNo 02-2-8442

Test Method forTotal Bacteria Gount

Objective

To assess the levels of bacteria present in the office premises and compare withthe Singapore Standard SS 554 : 2009.

Instrument Used

Surface Air System Model SAS Super 100

Method

The centrifugal fan from the air sampler drew in a fixed volume of air (100liters/minute) from each sample location. Microorganisms like bacteria weretrapped in the 90 mm petri dish that contain Tryptone Soy Agar. The petri disheswere incubated for a period of 48 hours at a constant temperature of 35"C.


Total Bacteria Count - < 500 CFU/m'

Procedure

1)

2)

3)

4)

The air sampler has a fixed sample volume of 100 liters/minute. lt wasprogrammed to take a 2 minutes sample.

A 90 mm petri dish containing Tryptone Soy Agar was placed in betweenthe air sampler and the sampling head at the start of the test.

At the selected sampling locations, the sampler was positioned at a heightof approximate 1 .2 to 1 .5 meters above the floor.

At the end of the test, the agar plate was removed and sealed. Locationlabel was then attached.

Step 2 to step 4 were repeated again at each selected location.

The exposed agar plates were then incubated for a period of 48 hours at aconstant temperature of 35"C.

5)

6)

::J;TECH


85 EN /SO 9001:2000 CERTNO: FS 68089

ISO 9001 CERr No 02-2-8442

Test Method forTotal Fungal Gount

Objective

To assess the levels of fungi present in the office premises and compare with theSingapore Standard SS 554 : 2009.

lnstrument Used

Surface Air System Model SAS Super 100

Method

The centrifugal fan from the air sampler drew in a fixed volume of air (100liters/minute) from each sample location. Microorganisms (like yeast & mould)were trapped in the 90 mm petri dish that contain Rose Bengal Agar. The petri

dishes were incubated for a period of 120 hours at a constant temperature of25"C.

Specification (As per Singapore Standard SS 554 :2009)

Total Fungal Count - < 500 CFU/m3

Procedure

1) The air sampler has a fixed sample volume of 100 liters/minute. lt wasprogrammed to take a 2 minutes sample.

2) A g0 mm petri dish containing Rose Bengal Agar was placed in betweenthe air sampler and the sampling head at the start of the test.

3) At the selected sampling locations, the sampler was positioned at a height

of approximate 1.2 to 1.5 meters above the floor.

4) At the end of the test, the agar plate was removed and sealed. Locationlabel was then attached.

5) Step 2 to step 4 were repeated again at each selected location.

6) The exposed agar plates were then incubated for a period of 120 hours at

a constant temPerature of 25"C.

CSS5TECH

CESSTECH (S) PTE LTDAn lS0 9001:2000 Certified Company

BS EN /S0 9001:2000 CERTNO: FS 68089

ISO 9001 CERr No 02-2-8442

Test Method forTemperature & Relative Humidity

Objective

To confirm that ambient room temperatures and relative humidities aresatisfactory and conform to the Singapore Standard SS 554 : 2009.

Instrument Used

Testo Model 635 Meter

Method

The meter employed a thermistor for temperature measurement and a thin-filmcapacitive sensor for humidity measurement.


Average Temperature Level -24.0 to 26.0 "C

Average Humidity Level - < 65 % RH

Procedure

1)

2)

3)

The Testo meter is a direct reading instrument.


Temperature and relative humidity levels were recorded after the readinghad stabilized.

eE*CESSTECH (S) PTE LTD

An ISO 9001:2000 Certified ComPanYBSEN/SO 9001:2000 CERTNO: FS68089

/S0 9007 CERTNo 02-2'8442

Test Method forAir Movement

Objective

To confirm that air velocities are satisfactory and conform to the singapore

Standard SS 554 :2009.

lnstrument Used

TSI Model 8346-M-GB Meter

Method

The TSI meter employed a hot wire sensor to measure air velocities.

specification (As per singapore standard ss 554 : 2009)

Average Air Velocity Level - Between 0.10 m/sec to 0.30 m/sec

Procedure

1) The TSI meter is a direct reading instrument'

2) The meter was positioned at the selected sampling locations at a height of

apProximate 1 '2 meter'

3) Air velocity levels were recorded after the reading had stabilized

Secfio n C

Specific Findings

A)

1)

2)

3)

::';TECH

CESSTECH (S) PTE LTD

^' i: P,?,t t

lJ,1t i:,t'i f i:t !,* n tiSO 9007 CERr No 02-2-8442

Specific Findings

An indoor air quality (lAO) audit was conducted at DSO Antennas and ScatteringLaboratory at NUS on 1't March 2010. The testing was carryout in accordancewith the Code of Practice (SS 554 : 2009) for lndoor Air Quality for Air-Conditioned Buildings published by SPRING Singapore. These include thechemical, physical and biological parameters.

Ghemical Parameters

Garbon DioxideThe carbon dioxide levels detected at all the 3 locations that we tested andthey were within the threshold limit specified by the Singapore Standard SS554 for indoor air quality in air-conditioned buildings. The readings were487 ppm, 442 ppm and 520 ppm.

Garbon MonoxideCarbon monoxide was not detected (lower than the detectable threshold ofthe instrument used) at all the 3 locations that we tested.

FormaldehydeFormaldehyde was detected at the Conference Room and theformaldehyde level was within the threshold limit of 0.1 ppm. Theformaldehyde level detected was 0.09 ppm.

Formaldehyde was not detected (lower than the detectable threshold of theinstrument used) at both the Far Field Operation Room and Near FieldOperation Room.

OzoneOzone was not detected (lower than the detectable threshold of theinstrument used) at all the 3 locations that we tested.

Volatile Organic GompoundsVolatile organic compounds were detected at all the 3 locations that wetested and they were within the threshold limit specified by the SingaporeStandard SS 554 for indoor air quality in air-conditioned buildings. Thereadings were between 0.4 ppm and 2.2 ppm.

4l

5)

6)

7)

8)

e)

c)

10)

::'JTECH

B) Physical Parameters


BS EN /SO 9001:2000 CERTN0; FS 68089

ISO 9007 CERr No 02-2-8442

Resipi rable Particu lateParticulate contaminations detected at all the 3 locations that we testedwere within the limit of 50 Ug/m'. This is the threshold limit as specified in

the Singapore Standard SS 554 for indoor air quality in air-conditionedbuildings. The readings were between 1.5 pg/m3 and 5.3 pg/m'.

TemperatureThe temperature readings at both the Conference Room and Far FieldOperation Room fell within the recommended range of 24'C to 26'C. Thetemperature readings recorded were 25.5"C and 24.9"C.

The temperature reading at the Near Field Operation Room fell outside therecommended range of 24'C to 26'C. We recorded the temperature of22.8"C.

Relative HumidityRelative humidity readings at all the 3 locations that we tested were withinthe recommended range of 70% RH. The relative humidity readingsrecorded were between 515% RH and 62.9% RH.

Air MovementAir velocities at all the 3 locations that we tested were within the stipulatedlevel.

Biological Parameters

Total Bacteria GountThe total bacteria counts at all the 3 locations that we tested were within

the limit of 500 CFU/m3 specified by the Singapore Standard SS 554 forindoor air quality in air-conditioned buildings. The total bacteria counts at

the 3locations were 355 CFU/m3, 190 CFU/m3 and 125 CFU/m3.

Total Fungal GountThe total fungal counts at all the 3 locations that we tested were within the

limit of 500 CFU/m3 specified by the Singapore Standard SS 554 for indoor

air quality in air-conditioned buildings. The total fungal counts at the 3

locations were 60 CFU/m3, 1 15 CFU/m3 and 15 CFU/m3.

1',1)

Secfio n D

Conclusion

:!';TECH

CESSTECH (S) PTE LTDo'

s?,tsi ffittJ,t'*Ifil 9,* nt

Gonclusion iso e001 cERrNo 02'2'8442

From the test result, it indicated that the temperature at the Near Field Operation

Room was outside the limits set out in the spring Singapore ss 554 Standard for

gooo indoor air quality in air-conditioned buildings. some fine adjustment to the

ihermostat control should able to bring the temperature of this room to be within

the recommended limits.

As for the other lAe parameters that we have tested, they were all within the limits

ouflined in the spring singapore ss 554 Standard for good indoor air quality in

air-conditioned buildings. We do not detect any major problem.

my.ece.nus.edu.sg · Created Date: 4/5/2010 5:18:21 PM

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