top of page


Low-cost catalytic pellistor gas sensor for residential / light commercial applications

NAP-67A gas sensor for LPG


Detectable Gas:

Detection range:

Voltage supply:

Current drawn:

Typical Signal Sensitivity:

Zero Offset (20oC):

Response time (90%):


Expected lifetime:

Long Term Span Drift:

Long Term Zero Drift:


0 – 50% LEL

2.0V +/- 0.2V

160mA +/- 10 mA

20mV / 0.2% C4H10

0mV +/-  35mV

< 10 seconds

+/- 1% LEL

> 3 years

<+/- 2% FSD/ month

<+/- 2mV / year

Operating Conditions

Operating temperature:

Humidity range:


Temperature Drift (zero):


-30 +70°C

0 – 95% RH

0.9 – 1.1 atm

<+/- 2% LEL

Effectively linear to 0-60% LEL

General Description:

The Nemoto NAP-67A is the version of the NAP-56A which is optimised for the detection of higher hydrocarbons such as LPG, Propane, Butane, Gasoline vapours etc.


It should not be used if the sensor is required to detect methane or natural gas, because its signal level on Natural gas is very small. But its signal for gases such as LPG is significantly higher than that of the NAP-55A. Internally closely related to the NAP-66A, the NAP-67A benefits from a slightly higher signal output and a wider temperature range which makes the NAP-67A particularly useful in Instruments designed for the detection of LPG leaks Caravans and other Recreational Vehicles.

  •        Measures flammability directly

  •        Highly resistant to Catalyst poisons

  •        Resistant to shocks and vibration

  •        Effectively Linear output to 50%LEL

  •        High Signal Outpit top LPG Gases

  •        Unaffected by Humidity

  •        Very Simple circuitry

  •        Very Low Long term drift

bottom of page