The SMART3G-D2 fixed gas detector 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.



The SMART 3G-D2 is a SIL2 certified fixed gas detector ideal for  a variety of industrial applications, capable of monitoring toxic, flammable and refrigerant gases in harsh environments and classified areas.

Non-intrusive calibration

Ideal in harsh environments, the SMART3G-D2 features non-intrusive calibration for an accurate and easy adjustment via Hall-effect switches, without opening the instrument.

Wide variety of gas and sensor options

The SMART3G-D2 has options for the detection of over 50 flammable, toxic and refrigerant gases

Safety Integrity Level (SIL) certification

The SMART3G-D2 is SIL2 hardware and SIL3 software; with a redundant system also the hardware is SIL3.


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 Aluminum 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
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) Electrochemical sensor
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 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
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
Toluene (C7H8) Catalytic sensor
Tri-Methylbenzene (C9H12) Catalytic sensor
Vinyl Acetate (C4H6O2) Catalytic sensor
Xylene (C₈H₁₀) Catalytic sensor


Sensor type
R152a Infrared sensor
R454B Infrared sensor
R32 Infrared sensor
R134a Infrared sensor
SF6 Infrared sensor
R125 Infrared sensor
R1234yf Infrared sensor
R1234ze Infrared sensor
R404A Infrared sensor
R407A Infrared sensor
R407F Infrared sensor
R449A Infrared sensor
R507A Infrared sensor
R410A Infrared sensor
R417A Infrared sensor
R448 Infrared sensor