The SMART3 NC is a point gas detector for safe areas with a number of features for easy operation and maintenance such as ongoing system self-diagnosis, seamless installation and maintenance via handheld keypad and options for relay output and Modbus communication.



The SMART3 NC is a point gas detector for safe areas, designed to be installed in non-classified areas and car parks.

Ongoing system self-diagnosis

Self-diagnostic procedures to ensure correct detector operation and performance.

Relay and Modbus communication options

The SMART3 NC features standard 4-20mA and optional 3 relay output  as well as the option of an RS485 interface for Modbus communication.

Calibration made easy

The SMART3 NC detectors offer a seamless installation whilst maintenance and calibration can be done via the handheld keypad STS/CKD.


Catalytic sensor Electrochemical cell Infrared sensor
Size Box: H100 x W100 x D52 mm (3.9 x 3.9 x 2ins)
Cover: H105.8 x W105.8 x D7.8 mm (4.2 x 4.2 x 0.3ins)
Weight 0.25kg
Enclosure material Polycarbonate
Ingress Protection IP55
Connection 2 x M20
Power 12-24 Vdc
Electrical output Analogue 4-20 mA output; 1 or 3 relay board (optional); serial RS485 output (optional)
Operating temperature -20 / +60°C -20 / +55°C -20 / +60°C
Humidity 0 / 90% RH 15 / 90% RH 0 / 90% RH
EMC compliance EN 61000-6-3:2007 + A1:2011; EN 50270:2015


Sensor type
Methane (CH₄) Catalytic sensor
Petrol Vapours Catalytic sensor
LPG Catalytic sensor
Carbon Monoxide (CO) Electrochemical sensor
Nitrogen Dioxide (NO₂) Electrochemical sensor
Chlorine (CL₂) Electrochemical sensor
Sulphur Dioxide (SO₂) Electrochemical sensor
Hydrogen Chloride (HCL) Electrochemical sensor
Carbon Dioxide (CO₂) Infrared sensor