Gas Transmitter with Integrated Area Monitor  
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Instruction manual
The Sensor Transmitter Integrated Area Monitor (ST-IAM) utilises a range of sensor technologies to detect most gases. The ST-IAM can be used on a stand-alone basis or integrated into Controls or Building Management Systems (BMS).
Application :
Refrigerant gases all refrigerant gases including: Ammonia, Carbon Dioxide, Hydrocarbons, Halocarbons - HFCs, HCFCs, CFCs.
Combustible gases such as: Methane, LPG, Propane, Butane, and Hydrogen
Toxic gases such as: Carbon Dioxide and Ammonia in refrigeration, Hydrogen Sulphide in sewage treatment and Carbon Monoxide in underground car parks
Volatile Organic Compounds such as: Acetone, Benzene, Carbon Tetrachloride, Chloroform, Ethanol, Toluene, Trichloroethylene.
Features :
Technical Specification   ST-IAM Standard          
Power Supply  

12/24 V a.c, 12/30 V d.c., 400mA maximum

Power Monitoring   Green LED
Visual Alarm  

Orange LED for low level
Red LED for high level

Analogue Outputs   0-5V, 0-10V, 4-20mA
Serial Data Interface   RS 485
Digital Outputs   2 Relays rated 1 Amp/24 V d.c /120 V
Fault state   0-1V, 0-2mA
Analogue Outputs   2 Relays rated 1 Amp/24 V d.c /120 V
a.c Selectable: NO/NC auto or manual reset, response delay 0, 1, 5 or 10 min
Dimensions and Weight   1 Relay rated 1 Amp/24 V d.c /120 V a.c
Selectable delay: 0,1,5,10min
Dimensions and Weight   155 x 185 x 80 mm 850 g
Standard Compliance     WEEE RoHS EuP
Sensor Information   ElectrochemicalEC   Semiconductor withfilter (multigas) SC   Catalytic (multigas) CAT   InfraredIR
TypicalMeasurement   0-1000ppm   10-1000ppm   ppm- LEL%   ppm - %

Temperature Range


A: -20°C to +40°C
B: -40°C to +40°C

  -40°C to +50°C   -40°C to +50°C    

Humidity Range
non condensing

  0 to 95%   0 to 95%   0 to 95%   0 to 95%
Typical Sensor Life   3 yrs   5-8 yrs   5 yrs   5 yrs
Alarm threshold T50   19 sec   76 sec(filtered)   28 sec   42 sec
                        T90   47 sec   215 sec(filtered)   46 sec   95 sec
Recovery Time   900 sec   600 sec   600 sec   8 mins
Linearity   Linear over calibrated range
Calibration   Local regulations may specify the procedure and frequency required. Standards
Requirements   generally require at least annual testing or calibration. Refer to Murco for instructions.
Semiconductor sensors are non-selective, but calibrated to a specific gas.
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