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

NCH-180 Explosion-Proof Flammable Gas Sensing Head


General Description:

The Nemoto NCH-180 is a new low cost catalytic flammable gas sensor fitted within a certified flameproof enclosure.

Using the popular NAP-56A sensor, the NCH-180 offers the excellent detection performance, stability and long life you may expect from a Nemoto Pellistor Gas Sensor, but may also be used in hazardous locations when coupled with a suitable certified flameproof Junction Box.

The NCH-180 is remarkably compact compared with other similar devices, with the sensor contained within the same barrel as the mounting thread, resulting in a very ergonomically elegant design.


Detectable gas:

All Flammable / Explosive Gases

Detection range:

0 – 100%LEL

Recommended Voltage

2.5V +/- 0.1V

Current drawn

180mA +/- 20 mA

Minimum Sensitivity

20mV / % CH4

Zero Offset

0mV +/-  30mV


+/- 1% LEL

Response time (90%):

< 30 seconds

Maximum Long Term Drift:


<+/- 8% FSD/ Year


<+/- 2 mV / year

Temperature Range:

 -20to +70 degrees C

Humidity range:

0-95% RH, non condensing


0.9 – 1.1 atm

Linearity  *

Effectively linear to 60% LEL

Expected Lifetime

> 5 Years

Mounting Thread

M20 - 1.5mm Pitch

* May be extended to 100% LEL with suitable compensation