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

NCP-300 Catalytic (Pellistor) Type Flammable Gas Sensor



Detectable gas:

All Flammable / Explosive Gases

Detection range:

0 – 100%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-300 is a catalytic (pellistor) type flammable gas sensor supplied as a matched pair of elements mounted on TO4 size headers and protected by a metal can.  The sensor detects and measures the presence of flammable gases and vapours in air, in the range 0-100% 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-300 exhibits excellent long term zero and sensitivity stability and a high level of resistance to catalytic poisons. The device is compatible with a wide range of commercially available Gas Detection Systems and remote flammable gas detection heads.