NCP-180A (Special for Acetylene)

Twin Header Catalytic (Pellistor) Flammable Gas Sensor

General Description:

The Nemoto NCP-180A 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-180A pellistor, however, cannot be poisoned by Acetylene, and will operate reliably in this application. The NCP-180A 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.



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:


0 – 100% LEL

2.0V +/- 0.1V

145mA +/- 15 mA

8mV / 10% LEL

0mV +/-  25mV

< 8 seconds

+/- 1% LEL

>3 years

<+/- 1% FSD/ month

<+/- 0.5mV / month

Operating Conditions:

Operating temperature:

Humidity range:


Temperature Drift (zero):


-20 to +60 oC

0 – 95% RH

0.9 – 1.1 atm

<+/- 2% LEL

Effectively linear to 0-100% LEL


  •        Special Sensor - Acetylene Monitoring
  •        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