Twin Header  Catalytic (Pellistor) Flammable Gas Sensor

General Description:

The Nemoto NCP-170 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-170 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.



Detectable Gas:

Detection range:

Voltage supply:

Current drawn:

Minimum Sensitivity:

Zero Offset (20oC):

Response time (90%):


Expected lifetime:

Long Term Span Drift:

Long Term Zero Drift:

All Flammable Gases

0 – 100% LEL

2V +/- 0.1V

170mA +/- 20 mA

20mV / % CH4

0mV +/-  30mV

< 8 seconds

+/- 1% LEL

>3 years

<+/- 1% FSD/ month

<+/- 0.5mV / month

Operating Conditions:

Operating temperature:

Humidity range:


Temperature Drift (zero):


-20 +70 degrees C

0 – 95% RH

0.9 – 1.1 atm

<+/- 2% LEL

Effectively linear to 0-100% LEL


  •        Measures flammability directly
  •        Highly resistant to Catalyst poisons
  •        Resistant to shocks and vibration
  •        Effectively Linear output to 100%LEL
  •        Specific to flammable  gases
  •        Unaffected by Humidity
  •        Very Simple circuitry
  •        Very Low Long term drift