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

NCP-180-A Catalytic (Pellistor) Type Acetylene Gas Sensor


Detectable gas:

All Flammable / Explosive Gases

Detection range:

0 – 100%LEL

Recommended Voltage

2.0V +/- 0.1V

Current drawn:

145mA +/- 15 mA

Zero Offset:

0 +/- 25mV

Minimum Sensitivity:

8mV / 10% Acetylene in Air


+/- 1% LEL

Response time (90%):

< 8 seconds

Maximum Long Term Drift:


<+/- 1% Signal/month


<+/- ½ mV / month

Temperature Range:

 -20º +60º C

Temperature Drift (zero):

<+/- 2% LEL (-20º +60º C)

Humidity range:

0-100% RH, non condensing


0.9 – 1.1 atm


Effectively linear 0-100% LEL

General Description:

The Nemoto NCP-180-A is a special application 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 is specifically designed for the detection of Acetylene in air in the range 0-100% LEL.

Until now, the use of pellistors to monitor Acetylene levels has presented technical problems due to Acetylene's ability to poison catalytic gas sensors, resulting in short sensor lifetimes in the field. The NCP-180-A pellistor, however, cannot be poisoned by Acetylene, and will operate reliably in this application. The NCP-180-A should not be used for any other purpose without first consulting Nemoto.

The device is compatible with a wide range of commercially available Gas Detection Systems and remote flammable gas detection heads.