Gas Detector SMART 3G-D2

SMART 3G-D2

Gas Detector SMART 3G-D2

SMART 3G-D2

Art. number:
Date published 19.01.2026
Unavailable
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The SMART3G-D2 from Sensitron has sensor options for detecting more than 50 toxic, flammable and refrigerant gases. It is ideal for a variety of industrial applications and harsh environments. The device features non-intrusive calibration and a 4-digit back-lit display for the gas concentration reading, 5 mode status LED and a high visibility multi-colour LED light ring.

This SIL2 certified fixed gas detector is a resilient all-rounder, capable of detecting over 50 flammable, toxic and refrigerant gases. Available with catalytic, electrochemical, infrared or intrinsically safe sensors, you can customise your  Sensitron SMART3G-D2 to suit your environment and needs.

Well suited to harsh environments, the SMART3G-D2 features non-intrusive calibration for an accurate and easy adjustment via Hall-effect switches, without opening the instrument or needing to declassify the area.

The SMART 3G-D2 is designed for use in all industrial environments with a bright 4-digit display that shows the measured gas concentration in real time, and the high-brightness LED crown capable of signalling the 3 status levels, making it suitable for detection in even poorly lit areas.

  Sensor type
Acetic Acid (CH3COOH) Catalytic sensor
Acetone (C3H6O) Catalytic sensor / Infrared sensor
Acetylene (C2H2) Catalytic sensor
Ammonia (NH3) Catalytic sensor / Electrochemical sensor
Benzene (C6H6) Catalytic sensor
Butadiene (C4H6) Infrared sensor
Butane (C4H10) Catalytic sensor / Infrared sensor
Carbon Monoxide (CO) Catalytic sensor / Electrochemical sensor
Chlorine (CL2) Electrochemical sensor (intrinsically safe detector)
Cyclohexane (C6H12) Catalytic sensor / Infrared sensor
Cyclopentane (C5H10) Catalytic sensor
Dimethyl ether (C2H6O) Infrared sensor
Ethane (C2H6) Catalytic sensor / Infrared sensor
Ethanol (C2H6O) Catalytic sensor / Infrared sensor
Ethyl Acetate (C4H8O2) Catalytic sensor / Infrared sensor
Ethyl Ether ((C2H5)2O) Catalytic sensor
Ethylene (C2H4) Catalytic sensor
Ethylene Oxide (C2H4O) Catalytic sensor
Heptane (C7H16) Catalytic sensor / Infrared sensor
Hexane (C6H14) Catalytic sensor / Infrared sensor
Hydrogen (H2) Catalytic sensor / Electrochemical sensor
Hydrogen Cyanide (HCN) Electrochemical sensor (intrinsically safe detector)
Hydrogen Sulphide (H2S) Electrochemical sensor
ISO Butane (C4H10) Catalytic sensor / Infrared sensor
ISO Butyl Alcohol ((CH3)2CHCH2OH) Catalytic sensor
ISO Pentane (C5H12) Catalytic sensor
ISO Propyl Alcohol (C3H8O) Catalytic sensor / Infrared sensor
Isobutylene (C4H8) Infrared sensor
JP8 Catalytic sensor
LPG Catalytic sensor / Infrared sensor
Methane (CH4) Catalytic sensor / Infrared sensor
Methanol (CH3OH) Catalytic sensor
Methyl Ethyl Ketone (MEK) Catalytic sensor
Nitric Oxide (NO) Electrochemical sensor
Nitrogen Dioxide (NO2) Electrochemical sensor (intrinsically safe detector)
Nonane (C9H20) Catalytic sensor
Oxygen (O2) Electrochemical sensor
Pentane (C5H12) Catalytic sensor / Infrared sensor
Petrol Vapours Catalytic sensor / Infrared sensor
Propane (C3H8) Catalytic sensor / Infrared sensor
Propyl alcohol (C3H8O) Catalytic sensor
Propylene (C3H6) Catalytic sensor / Infrared sensor
Styrene (C8H8) Catalytic sensor
Sulphur Dioxide (SO2) Electrochemical sensor (intrinsically safe detector)
Toluene (C7H8) Catalytic sensor
Tri-Methylbenzene (C9H12) Catalytic sensor
Vinyl Acetate (C4H6O2) Catalytic sensor
Xylene (C8H10) Catalytic sensor
  with catalytic
sensor
with electrochemical
sensor
with infrared
sensor
intrinsically safe
detector
Size H145 x W187 x D108 mm (5.7 x 7.4 x 4.25ins) H138 x W200 x D119 mm (5.4 x 7.9 x 4.7ins)
Weight 1.9kg 2.7kg
Enclosure material Aluminium pressure die-casting with epoxy paint chromating and chemically resistant
Ingress Protection IP65
Connection 3 x 3/4” NPT
Power 12-24 Vdc
Display 7-segment display, 5 status LED and 4 intelligent LED
Electrical output Analogue 4-20 mA output; 3 relay board; serial RS485 output (optional) Analogue 4-20 mA output; 1 or 3 relay board (optional); serial RS485 output (optional)
Operating temperature -40 / +60°C -30 / +55°C -40 / +60°C -20 / +50°C
Humidity 20 / 90% RH @40°C 15 / 90% RH non condensing 20 / 90% RH @40°C 15 / 90% RH non condensing
Response time t90 < 60 s ; t50 < 20 s   t90 < 60 s ; t50 < 20 s  
Performance Tested in accordance with EN 60079-29-1 standard   Tested in accordance with EN 60079-29-1 standard  
Functional safety SIL2 hardware and SIL3 software
Approvals EMC, ATEX, IECEx
  Sensor Type Refrigerant Type
R152a Infrared F-gas
R454B Infrared F-gas
R32 Infrared F-gas
R134a Infrared F-gas
SF6 Infrared F-gas (Switchgear)
R125 Infrared F-gas
R1234yf Infrared F-gas
R1234ze Infrared F-gas
R404A Infrared F-gas
R407A Infrared F-gas
R407F Infrared F-gas
R449A Infrared F-gas
R507A Infrared F-gas
R410A Infrared F-gas
R417A Infrared F-gas
R448 Infrared F-gas
R290 Infrared Natural Refrigerant
R600a Infrared Natural Refrigerant
R717 Electrochemical/Catalytic Natural Refrigerant
R744 Infrared Natural Refrigerant
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