Sensitron Smart3-R Gas Detector

SMART3-R is developed to detect different gases in non classified areas, as machinery rooms and laboratories.

In stock

Detects flammable, toxic and refrigerant gases in non-hazardous environments.

Sensitron Smart3-R Gas Detectors are designed for detecting flammable, toxic and refrigerant gases, the Sensitron Smart3-R Gas Detector is a fixed gas detector available with catalytic, infrared or electrochemical sensors. Suitable for gas detection in machinery rooms, residential, and industrial environments.


  • Standard 4-20 mA, RS485 and 3-relay outputs
  • Multicoloured LED ring
  • Audible warnings with an internal buzzer
  • Ongoing system self-diagnosis
  • Detection of a range of gases with various sensors
  • Optional remote sensor head
  • Easy replacement of sensors
  • Standard 12-24 Vdc power supply. On request 90-240 Vac, without 4-20 mA transmission
  • IP42 rating for protection against dripping water and objects more than 1 mm in size
  • Complies with the ISO 5149-3 standard

The Smart3-R detector is equipped with multicolour LED lights as an optical indicator of the detector’s status, and an internal buzzer that will alert if any alarm conditions are met.

Sensing Element (Catalytic)
Application Machinery rooms, laboratories and non-classified areas
Sensing element Catalytic
Predicted sensor life 4 / 5 years
Gas detected Methane, LPG, Propane, Butane, Petrol Vapours
Fullscale 0 – 100% LFL
Sensing Element (Infrared)
Application Machinery rooms, laboratories and non-classified areas
Sensing element Infrared
Predicted life sensor 5 years
Gas detected CH4; C3H8; C4H10; R152a; R454B; R32; R1234YF; R1234ZE; R134a; R404A; R407C; R410A; SF6; R125; R407A; R407F; R449A; R507A; R417A; R448; CO2; R1233ZD
Fullscale 0 – 100% LFL for flammable gases
0 – 5000 ppm o 0 – 2000 ppm for refrigerant gases
0-5000 ppm; 0-2%Vol; 0-5%Vol; 0-30%Vol for CO2
Accuracy ±1% fullscale for readings < 25% fullscale
±2% fullscale for readings < 50% fullscale
±5% fullscale for readings > 50% fullscale
Sending Element (Electrochemical)
Application Machinery roooms and refrigeration plants
Sensing element Electrochemical cell
Predicted sensor life 2 / 3 years
Gas detected O2 [0-25% Vol], CO [0-500 ppm], SO2 [0-20 ppm], NH3 [0-100/200/1000 ppm], Cl2 [0-20 ppm], H2S [0-50 ppm], NO2 [0 – 20 ppm]
Electrical Data
Power supply 12-24 Vdc or 90-240Vac
Signal Output 3 relays; RS485 serial output, 4-20 mA analogue output (only for 12 Vdc version)
Dissipated power 73 mA at 24 Vdc
Relays contact rating 1.0 A at 30 Vdc
Optical indications 4 smart LED
Acoustic indications Buzzer 63 dB @1mt
Remote head cable RJ12 6P6C
Environmental Conditions
Storage temperature -40 / +85°C
Operating temperature -40 / +60°C
-40 / +50°C 230V version
Operating humidity 0 / 95% RH non condensing
EMC EN 61000-6-3:2007 + A1; EN 50270:2015
Electrical safety (90-240 Vac version) EN 61010-1: 2010 / A1 2019
Refrigeration Standards EN 378-3; EN 14624; EN 50676; IEC 60335-2-40 Annex LL;
ISO 5149-3; F-Gas Regulation
External case
Material Polycarbonate
Dimensions Box: 120 x 120 x 52 mm
Cover: 130 x 130 x 22 mm
Remote head box 106 x 106 x 56 mm
Maximum length of remote head’s cable: 5 m
Weight Detector: 450 g
Remote head: 300 g
Cable entry 2 entries with M20 cable glands
6 optional entries for M16 cable glands
IP Grade IP42

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