Gas Sensor  
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Instruction manual
The Gas Sensor (MGS) is a state-of-the-art fixed gas detector which can detect a wide range of different gases. The sensors 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   MGS Standard
Power Supply   12/24V AC/DC ± 20%(IR 24V AC/DC)
Power Consumption   EC (24V): 45.7mA SC: 91mA
Power Monitoring*   Green LED
Visual Alarm*   Red LED
Audible Alarm*   Sounder, enabled/disabled
Fault monitoring   Red LED ON – Green OFF
Fault state   0-1V, 0-2mA
Analogue Outputs   0-5V, 1-5V, 0-10V, 2-10V, 4-20mA
Digital Outputs*   1 Relay rated 1 Amp/24 V d.c /120 V a.c
Selectable delay: 0,1,5,10min
IP Rating   IP41 OR IP66
Dimensions and Weight   86 x 142 x 53 mm 180 g
Standard Compliance       WEEE RoHS CE, EXD
Sensor Information   ElectrochemicalEC   Semiconductor withfilter (multigas) SC   InfraredIR
Typical MeasurementRang   0-1,000 ppm   10-1,000 ppm   ppm - %
Temprature Rang  

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%
Typical Sensor Life   3 yrs   5-8 yrs   8-10yrs
Alarm threshold T50   19 sec   76 sec(filtered)   25 sec
T90   47 sec   215sec(filtered)   90sec
Recovery Time   900 sec   600 sec   210 sec
Linearity       Linear over calibrated range    
Calibration   Local regulations may specify the procedure and frequency requiredStandards
Requirements   generally require at least annual testing or calibration. Refer to Murco for
instructions. Semiconductor sensors are non-selective, but calibrated to a specific
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