DG-8R/MR Digital RS-485 output

Device group: Threshold gas detectors
Device type: DG/MR

Digital DG/MR detectors are designed for continuous monitoring of gases in enclosed spaces. When preset concentration values are exceeded, the detector’s optical alarm signaling is activated, built-in relays change their state and information is transmitted to a digital control module using a RS-485 network. The detectors are designed for work in the Digital Gas Detection System.

The detectors have an exchangeable module with a semiconductor, electrochemical, or optical sensor (Infra-Red). The interchangeability of the gas sensor modules facilitates maintenance, simplifies calibration and reduces operating costs.

The DG/MR detectors cannot be used in areas classified as explosive atmospheres of gases, vapours or dust.

Area of application

  • industrial plants, logistics centres, public facilities;
  • extensive rooms at risk of toxic or explosive gas emissions with locally controlled sirens.


  • communication, control and transmission of information through the port in RS-485 standard, with MODBUS RTU protocol;
  • two alarm thresholds or measurement mode (for electrochemical sensors and Infra-Red);
  • two built-in relays with NO/NC contact, on a removable board (for A1 and A2 status);
  • sensor in replaceable intelligent module (replaceable with DG/F and DG/P);
  • sensor can be selected for the application;
  • short detector response time;
  • built-in control microprocessor means reliable and stable operation;
  • thermal compensation system;
  • history of alarm states;
  • semi-automatic addressing in digital network (without opening the housing);
  • screwless terminals, removable, with possibility of connecting two FTP wires;
  • selective LED optical optimization;
  • two cable entries – easy connection of successive detectors (loop-through);
  • optionally, the possibility of being equipped with an additional casing made of steel pipes (AR-1d) or a casing for ventilation ducts (DG/w version);
  • configuration of detector settings via dedicated configuration software „DETnet View”, available at https://www.gazex.pl/oprogramowanie/;
  • all detectors are calibrated in our own GAZEX Calibration Laboratory operating in accordance with PN-EN ISO/IEC 17025 (PCA accreditation no. AP150).

Block diagram

Device model: DG-8R/MR

Technical parameters

Gas sensor module Sensor Substance/property Standard alarm thresholds or measuring range
MS-8R/N Infra-red Carbon dioxide (CO2)

Contact control outputs
Output in RS-485 standard
Visual signalling, built-in
Supply voltage
110 x 140 x 55 mm
EAN Code
Net price
PLN2,029.00 N


Series Technical data Device information sheet Instruction manual Declaration of conformity

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Splash-proof enclosures AP-1
Splash-proof enclosures to protect detectors from adverse weather conditions and mechanical damage
Tubular shields AR-1
Profiled tube guards to protect the detector from direct mechanical damage
Gas test sets GTS
Test sets for verifying the correct operation of detectors by injecting a gaseous test mixture into the measuring chamber of the detector