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GSM-03 Gas Detector

Purpose and Field of Application

GSM-03 gas detectors are aimed for constant control in order to detect explosive concentrations of flammable gases, vaporized fluids and their mixtures of IIА, IIВ, IIС categories within Т1, Т2, Т3, Т4 groups in hazardous areas and premises of all classes, outside units and open areas by means of thermal chemical technique with ambient temperature from -60 to +50°С.

Applied thermal catalytic sensors detect a wide range of explosive gases and vapours. There are two modifications of alarm sensors: with diffusive or forced feeding of the controlled medium. Sensors are explosion proof with 1ExdllCT4 marking.



  • point control over gas content at the distance up to 1000 meters (resistance of each strand is not more than 10 Ohm) 
  • light alarm when reaching ultimate concentrations from 0 to 50 % of lower flammability level
  • formation of alarm limits – Limit 1, Limit 2, their values are setup by the software
  • sensor feeding is switched off when the gas ultimate concentration is reached in order to avoid failure (extension of the sensor service life)
  • forwarding analogue signal (4-20 mA) proportional to gas content and information through RS-485 interface and Modbus RTU protocol
  • availability of in-built and exterior calibration and checkup tools, providing user friendliness when installing to the facility



GSM-03 is an automatic fixed instrument, consisting of alarm unit (BS), power supply, interface unit (BI) and detecting unit (BD).

GSM-03 consists of modules with preset functions, on which the control system for flammable gases content is based in complience with the parameters set by the Customer.

GSM-03 design varies as per:

- number of BD and BS (number of control points)
- BI availability (for displaying and recording flammable gases concentrations in the air by PCS, for convenient calibration of BS)
- number of power supply units- embodiment
- discrete outputs type of the threshold device


GSM-03 Schematic Block Diagram


Technical Parameters

 Limit of permissible main absolute error, % of lower flammability level  


 Concentration metering range, % of lower flammability level

 from 0 to 50

 Explosion protection marking


 AC voltage, V

 from 187 to 242 

 DC voltage, V

 from 18 to 36

 Temperature of the medium to be controlled, °С

 from -60  to +50

 Ambient temperature, °С

 from 0 to 50


Features of GSM-03 in Phoenix Modification

  • modular design: from 1 to 20 control points
  • in-built feeding bus and interface between modules, which eases assembly and setup
  • availability of Ethernet Modbus TCP/IP to transfer data to upper level
  • availability USB 2.0 interface to setup the gas detector when connecting to PC
  • discrete outcome type – switching contact

GSM-03 Phoenix

 (WхHхD), mm

 Power supply BP 24/3


 BS-M2 alarm sensor


 BI-M2 Interface Unit


 BD detecting module



Service software

GSMWizard software is aimed to be operated with GSM-03.

This software allows to configure BI, setup operation parameters, such as polling rate, data exchange rate, connection parameters, reading data of BI log and explaining its meaning. BS is provided with calibration and testing functions, also data of BS log can be displayed.

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