Low-Cost Electrochemical Toxic Gas Sensors for Residential and Light Commercial Applications

NCP-170S-H Special High Temperature Catalytic Flammable Gas Sensor



Detectable gas:

All Flammable / Explosive Gases

Detection range:

0 – 50%LEL

Recommended Voltage

2.0V +/- 0.1V

Current drawn

170mA +/- 20 mA

Minimum Sensitivity

50mV / % CH4

Zero Offset

0mV +/-  30mV


+/- 1% LEL

Response time (90%):

< 8 seconds

Maximum Long Term Drift:


<+/- 5% Signal/ 3 month


<+/- ½ mV / month

Temperature Range:

 -40 +150 degrees C

Temperature Drift (zero)

+/- 2% LEL

Humidity range:

0-100% RH, non condensing


0.9 – 1.1 atm


Effectively linear to 0-60% LEL

General Description:

The Nemoto NCP-170S-H is a catalytic (pellistor) type flammable gas sensor supplied as a matched pair of pellistor elements mounted on a single header and protected by a metal mesh enclosure and can.

The sensor detects and measures the presence of flammable gases and vapours in air, in the range 0-60% of the Lower Explosive Limit (LEL) of the gas or vapour being measured. Very similar to the popular NCP-170S sensor, the NCP-170S-H employs a slightly different header material which allows the sensor to be used within a very wide temperature range (-40°C to +150°C).

The NCP-170S-H exhibits excellent long term zero and sensitivity stability and a high level of resistance to catalytic poisons. The highly automated manufacturing procedure employed by Nemoto results in a repeatable reliable sensor which, unlike similar devices, requires no trimming resistor to enable the detector to be matched with a compensator.