The NAP-55A Gas Sensor is a low–cost Catalytic Flammable Gas Sensor designed for the detection and measurement of any Flammable Gas in the range 0-50% LEL. Developed primarily for use in Residential Natural gas and LPG Gas Detectors, the NAP-55A has also been found to be useful in a wide variety of applications where reliable detection of flammable gas leaks and other gas hazards is required at low cost. The NAP-55A 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 Resistant to shocks and vibration Effectively Linear output to 50%LEL Specific to flammable gases Unaffected by Humidity Very Simple circuitry Very Low Long term drift