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

NAP-66A gas sensor for LPG


Detectable Gas:

Detection range:

Voltage supply:

Current drawn:

Signal Sensitivity:

Zero Offset (20degC):

Response time (90%):


Expected lifetime:

Long Term Span Drift:

Long Term Zero Drift:

LPG / Propane / Butane

0 – 50% LEL

2.0V +/- 0.2V

150mA +/- 10 mA

16mV / 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):


-10 +50°C

0 – 95% RH

0.9 – 1.1 atm

<+/- 2% LEL

Effectively linear to 0-50% LEL

General Description:

The NAP-66A Gas Sensor is a low–cost Catalytic Flammable Gas Sensor designed for the detection and measurement of Propane, Butane, and LPG vapours in the range 0-50% LEL.

Developed primarily for use in Residential Gas Detectors, the NAP-66A has also been found to be useful in a wide variety of applications where reliable detection of gas or fuel leaks and other gas hazards is required at low cost.

The NAP-66A uses the superior catalytic “pellistor” detection principle often used in high quality Industrial Gas Detectors. It hence has many benefits over other low cost gas sensor types.

  •        Measures flammability directly

  •        Highly resistant to catalyst poisons

  •        Shock and vibration resistant

  •        Effectively Linear output to 50%LEL

  •        Specific to flammable gases

  •        Unaffected by humidity

  •        Very simple circuitry

  •        Very Low Long term drift

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