Based just outside Munich in Germany Involved in gas detection for over 30 years. All products are manufactured in Germany itself. OEM manufacturer for.

•Based just outside Munich in Germany

•Involved in gas detection for over 30 years.

•All products are manufactured in Germany itself.

•OEM manufacturer for Dräger gas detection equipment in Europe

•Branching out into car park navigation systems (MSR Traffic)

•Branching out into HVAC peripherals (including water level detection)

There are number of methods to detect various gases and vapours. The most universally used methods are:

•Electrochemical (for most Toxic and O2 Gases)

•Catalytic Pellister (for flammables, combustibles)

•Infrared (for some Toxic and flammables)

•Solid State Semiconductor (for general broad spectrum Yes/No applications)

•Like a battery - has an electrolyte, electrodes and gas permeable membrane

•Gas diffuses through the membrane – reacts – reaction generates a current which is then measured by electronics and displayed in PPM or PPB

•For Combustibles, Explosives

•Pair of heated filament (Pt) – one with active reagent – the other for compensation – in Wheatstone bridge

•The combustible air+O2 diffuses through the flashback arrester – combustion takes place with increase in resistance – this translates into % of Lower Explosive Limit (% LEL)

•For some Toxic / Combustibles having IR absorption characteristics (CO, CH4)

•IR Instruments shine a “tuned” beam of IR wave to the diffused sample gas

•If the target gas is present, a portion of the beam light spectrum is absorbed in proportion to the concentration of the gas

•Made of solid state metal oxide (typical tin-oxide)

•Resistance changes in response to the presence of gas

•Instrument measures this resistance change and translates it into concentration

•Low cost, long life – good for Yes / No types of applications

Advantages:

•Low cost – used at source wherever leaks are likely to occur•Response to leak is quick and monitoring is continuous•There are no moving parts•Gel type electrolyte (no orientation problem)

Disadvantages:

•Electrochemical: Cross sensitivity, limited life, needs periodic calibration•Catalytic: Relative response to other gases, poisoning, carbonisation, 1-3 years life

Advantages:

•Most accurate commonly used technology, good sensitivity, selectivity and low risk of false alarm – less frequent calibration

Disadvantages:

•High cost, for select few gas types

Advantages:

•Solid state semi-conductor has a very long life time (typical 10 years)•Low cost•Good for Yes / No types of applications •Detects a wide range of gases (many which electrochemical or catalytic can not sense)

Disadvantages:

•Very low selectivity, possibility of false alarm, humidity / temp. effects•Long warm up times (usually 24 hours)

•Electrochemical sensor works like a battery with electrodes (one having a catalyst), electrolyte and gas diffusion membrane

•Electrodes wear out with time, electrolyte looses it’s conductivity – hence limited life

•Life also dependent on factors like heat, humidity, dirt, cumulative gas response – needs recovery time

•Over-flooding or exposure to very high concentration of target gas also reduces the life

•Warm-up period: Require a fixed bias across the sensor electrode for reaching equilibrium – For most the warm-up period varies from 1-8 hours

•Drift / Interference: Suffer from Zero Drift and Span Sensitivity Drift – hence need frequent calibration with standard reference gas – Also has range of interference Gases (always check)

•Humidity: In very dry/hot areas the electrolyte will dry out or in very high humid area electrolyte will absorb moisture and loose it’s conductivity – Both reducing sensor life

•Air-Flow / Pressure: Higher air-velocities can reduce sensor life by drying out the sensor or higher air pressure can leak the electrolyte – reducing life

•PPM (Parts per million) – for Toxics

•PPB (Parts per Billion)- for Pollutants

•% LEL (Lower Explosive Limit)- for combustibles

•% UEL (Upper Explosive Limit)- for combustibles

•% VOL – for Oxygen, CO2 and other gases

•10,000 PPM = 1 % Vol of Gas

•TWA: Time Weighted Average (Statutory Requirement based on 8 hours shift) – below this a worker is considered to be SAFE

•STEL: Short Term Exposure Limit (15 minutes) – below this is safe

•LEL (% Vol): 0-100 % LEL – no combustion in this range (for combustibles), for Methane: LEL=5 % Vol

•UEL (% Vol): No combustion above UEL (Oxygen starved area), for Methane UEL: 15 % Vol

•IDLH: Atmosphere which is Immediately Dangerous to life and health (use self contained breathing apparatus for entry)

•TLV: Threshold Limit Value (for toxics)

Electro-chemical:Minimum once a year.Recommended once every six months.1-3 years lifespanOxygen: 3-6 months recommended.

Pellister/Catalytic:Minimum once a year.Recommended once every six months.1-3 years lifespan

Infra-red:Recommended every five years15 years lifespan

Semi-conductor:Minimum once a year (usually zero point only)10 years lifespan

Equipment needed:•Gas Cylinder (from Air Liquid or BOC Gases)•Regulator•Calibration adaptor•User Manual for sensor with control voltages

Points WLA

1000Where:-A = Length x Width (in meters)L = size of major dimension (in meters)W = size of minor dimension (in meters)

ALWAYS round up the answer (as per 1668.2).

•Additional sensors for the areas where people congregate, waiting areas

• Sensors need to be evenly distributed so that no CO sensor is more than 25 M apart and NO2 sensor not more than 12.5 M apart

• Sensor to be installed 0.9 M – 1.8 M above floor level (human nose level)

•Set Points for ventilation fans: 80% or more of the ES (Exposure Standards) : full rate 50% or less of the ES : Minimum ventilation rate (not less than 3000 L / s for each zone) Intermittent operation of fans allowed (< 15 % of ES)

• 4 minutes delay-ON and 4 minutes delay-OFF for fans

• Marking, records, operation & maintenance is required

•Typically, allow one sensor per chillers, minimum.•Controller to be installed outside the plant room•Alarm & strobes to be installed (one outside & one inside the plant room)

Available as:•Solid state semi-conductor (broad spectrum)•Infra-red (refrigerant specific)

MSR Infrared Refrigerant sensors have now been approved by the Green Building Council of Australia (GBCA) and have been awarded maximum points.

Refrigerant Sensors / Transmitters:•Solid State sensors for leak detection•Infrared sensors for leak & quantative detection•Multi-output (0-20 & 4-20mA, 0-10 & 2-10VDC field selectable)•RS485/MODbus output (option)•Integrated relays (option)•Integrated LEDs (option)•Integrated LCD (option)•Integrated heater (option)•Multiple enclosures (option)

Refrigerant types:R22, R123, R134a, R507, R410a, R411a, R401b, R402a, R402b, R408a, R409b, R404a, R416a & many others

CO2 Sensors/Transmitters:•Infra-red sensor for leak & quantative detection where a high range CO2 sensor is required, 0-5%VOL.

•Multi-output (0-20 & 4-20mA, 0-10 & 2-10VDC field selectable)•RS485/MODbus output (option)•Integrated relays (option)•Integrated LEDs (option)•Integrated LCD (option)•Integrated heater (option)•Multiple enclosures (option)

NH3 Sensors/Transmitters:Electro-chemical sensors•Multi-output (0-20 & 4-20mA, 0-10 & 2-10VDC field selectable)•RS485/MODbus output (option)•Integrated relays (option)•Integrated LEDs (option)•Integrated LCD (option)•Integrated heater (option)•Multiple enclosures (option)

Available with an Infra-red cell as well.

Car park Sensors / Transmitters:•Electro chemical sensors (CO, NO2 & NO)•4-20mA output•Multi-output (0-20 & 4-20mA, 0-10 & 2-10VDC field selectable)•RS485/MODbus output (option)•Integrated relays (option)•Integrated LEDs (option)•Integrated LCD (option)•Integrated heater (option)•Multiple enclosures (option)

O2 Sensors/Transmitters:•Electro chemical sensor, 0-25%VOL•Multi-output (0-20 & 4-20mA, 0-10 & 2-10VDC field selectable)•RS485/MODbus output (option)•Integrated relays (option)•Integrated LEDs (option)•Integrated LCD (option)•Integrated heater (option)•Multiple enclosures (option)

Hazardous Area (ATEX Approved) Sensors:

• Available for Zone 1 & Zone 2 & Mining• For all gases (O2, Methane, Ethylene, CO,CO2, H2S, CL2, NO, NO2 etc)•With or without LC Display•4-20mA & (RS485 option)•For monitoring in ambient air, ground water contamination / soil contamination to meetEPA guidelines•For Oil/Gas, Petro-chemicals, Dangerous goods, Laboratories, Mining, Tunnels

Stand Alone Gas Alarms (Car parks, LPG, Natural Gas, O2, CO2 and many other gases)

•1x integrated (built-in) sensor & can accommodate additional 1x remote sensor

Available for multiple gases: CO, NH3, Explosive, NO2, CO2 , O2, SO2, H2S, CL2 & more

•Integral display & keypad

•4-20 mA analogue output

•Integral Relays & digital input

•Stand alone operation for fan logic control or alarms

•For small car parks, garages, labs, uni, schools (Single channel controller)

MGC03 Controller:2x 4-20mA analogue inputs2x digital outputs1x 4-20mA analogue output1x digital input (to mute siren)

MGC04 Controller:4-24x 4-20mA analogue outputs4-24x digital outputs2-12x 4-20mA analogue outputs4x digital inputs (to mute sirens)Compatible with MSR MODbus/BACnet/LON Gateways (read only access on BMS)

MLD-95A 24VDC Combo siren/strobe

Lo Alarm: Flasher (Red)

Hi-Alarm: Siren (105dB)

Text Legend Type, flashing, also audio

240 VAC, 24 VDC

E2S combination A-V Alarm, 24 VDC

Lo-Alarm: Flasher (Red)

Hi-Alarm: Audio (95 dB)

BRAND NEW product range

•Launching in March ‘10•“No frills” sensor•Low cost•IP44 enclosure•Wall mount only

Australian Exposure Standards for Atmospheric Contaminants in the Occupational Environment NOHSC: 3008 (1995) has set some TWA standards which are followed by various OH&S Statutory Bodies as well as referred by Standards (AS 1668.2 etc) – some typical TWA (for others refer to USA-ACGIH, OSHA, NIOSH)

NH3: TWA – 25 ppm, STEL – 35 ppmCO2: TWA – 5000 ppm, STEL – 30000 ppmCO: TWA – 30 ppm, STEL- 200 ppmH2S: TWA – 10 ppm, STEL- 15 ppmNO2: TWA – 3 ppm, STEL – 5 ppmNO (Nitric Oxide): TWA - 25 ppmN2O3 (Nitrous Oxide): TWA - 25 PPM (hospitals)Cl2 (Chlorine): TWA – 1 ppmO2 (Oxygen): 19 % Vol (minimum), Air has 20.9 % O2O3 (Ozone): TWA – 0.1 ppmR134a/R22 Freons: TWA – 1000PPM

Gas Formula Rel. Density (Air=1)

LEL UEL TLV=TWA

(ACGIH –US)

TLV-STEL

Acetone CH3COCH3

2.0 2.5% 12.8% 750 PPM 1000 PPM

Ammonia NH3 0.6* (lighter when warm)

15% 28% 25 PPM 35 PPM

Butane C4H10 2.0 1.5% 8.5% 800 PPM

Carbon Monoxide

CO 1.0 12.5% 74% 25 PPM

Ethanol C2H5OH 1.6 3.3% 19% 1000 PPM

Methane CH4 0.6 5% 15% Asphyxiant

Toluene C6H5CH3 3.1 1.1% 7.1% 50 PPM 188 PPM

Propane C3H8 1.6 2.1% 9.5% Asphyxiant

Hydrogen Sulphide

H2S 1.2 4.0% 44.0% 10 PPM 15 PPM

Email: [email protected] 32

Intelligent Gas Alarm India Pvt Ltd.69, Ramgali-7, Raja Park, Jaipur – 302004, INDIATelefax:+91-141-4033769, Mob: +91-99833 45452Email: [email protected], [email protected]: www.gasalarm.co.in, www.gasalarms.in