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

NCP-180S Single Header Catalytic Flammable Gas Sensor



Detectable gas:

All Flammable / Explosive Gases

Detection range:

0 – 50%LEL

Recommended Voltage

2.0V +/- 0.1V

Current drawn

300mA +/- 20 mA

Minimum Sensitivity

20mV / % CH4


+/- 1% LEL

Response time (90%):

< 8 seconds

Maximum Long Term Drift:


<+/- 1% Signal/month


<+/- ½ mV / month

Temperature Range:

 -20 +70 degrees C

Temperature Drift (zero)

+/- 2% LEL

Humidity range:

0-100% RH, non condensing


0.9 – 1.1 atm


Effectively linear 0-100% LEL

General Description:

The Nemoto NCP-300S is a catalytic (pellistor) type flammable gas sensor supplied as a matched pair of elements mounted on a single headers and protected by a metal mesh.  The sensor detects and measures the presence of flammable gases and vapours in air, in the range 0-50% of the Lower Explosive Limit (LEL) of the gas or vapour being measured.

Designed as a sensing platform for use in fixed flammable gas detection systems, the NCP-300S exhibits excellent long term zero and sensitivity stability and a high level of resistance to catalytic poisons. The device is intended as a lower cost alternative to the twin header NCP-300 and so is particularly suitable where good performance at low cost is essential.

The sensor also exhibits higher signal output than its twin header cousin, giving higher accuracy at low gas levels, with good linearity to 50% LEL.