NCP-170S-H (High Temperature Operation)

Single header High Output Catalytic Flammable Gas Sensor

General Description:

The Nemoto NCP-170S-H is a catalytic (pellistor) type flammable gas sensor supplied as a matched pair of pellistor elements mounted on a single header and protected by a metal mesh enclosure and can.

The sensor detects and measures the presence of flammable gases and vapours in air, in the range 0-60% of the Lower Explosive Limit (LEL) of the gas or vapour being measured. Very similar to the popular NCP-170S sensor, the NCP-170S-H employs a slightly different header material which allows the sensor to be used within a very wide temperature range (-40°C to +150°C).

The NCP-170S-H exhibits excellent long term zero and sensitivity stability and a high level of resistance to catalytic poisons. The highly automated manufacturing procedure employed by Nemoto results in a repeatable reliable sensor which, unlike similar devices, requires no trimming resistor to enable the detector to be matched with a compensator.



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 – 50% LEL

2.0V +/- 0.1V

170mA +/- 20 mA

50mV / % CH4

0mV +/-  30mV

< 8 seconds

+/- 1% LEL

> 3 years

<+/- 5% FSD/ 3 month

<+/- 0.5mV / month

Operating Conditions:

Operating temperature:

Humidity range:


Temperature Drift (zero):



-40 +150 oC

0 – 95% RH

0.9 – 1.1 atm

<+/- 2% LEL

(-20 to +60 deg C)

Linear 0-50% LEL


  •        -40 to +150 oC Temperature Range
  •        Measures Flammability directly
  •        Highly resistant to catalyst poisons
  •        Resistant to shocks and vibration
  •        Effectively Linear output to 60%LEL
  •        Specific to flammable gases
  •        Unaffected by Humidity
  •        Very simple circuitry
  •        Very low long term drift