A sensor specifically designed for Low LEL Hydrogen Monitoring in Fuel Cell or Battery Charging safety applications

Specifications

Recommended Voltage:

1.6V  +/- 0.1V

Current Drawn:

145 +/- 15mA

Zero Offset:

0mV +/- 30mV

Minimum Sensitivity:

30mV @ 1% H₂

Range:

 0-4% (0-100% LEL)

Minimum Range

0-10,000ppm

Accuracy:

+/- 500ppm (H₂)

Maximum Long Term Drift:

Span:

< +/- 5% LEL/3 months

Zero:

 <+/- 1 mV/Month

Response Time: 

T50: 3 sec  T90: 8 sec

Temperature Range:

-20°C to +60°C

Temperature Drift:

(-20°C to +50°C)

Zero:

 < +/- 200ppm

Humidity:

 0-95%RH, non-condensing

Humidity Response:

  +/- 2%LEL

Linearity:

 Effectively Linear

The Nemoto NP-AHSM 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 is optimised for the detection of hydrogen in air in range 0-100% LEL but is stable and sensitive enough to be used for ranges as low as 0-10,000ppm, with alarm levels as low as 2,000ppm without false alarms, provided good quality circuitry is employed. A feature of the NP-AHS is its very high selectivity to hydrogen, the sensitivity of the device to methane, propane and butane being negligible.

The NP-AHSM may be used as the sensing platform in fixed flammable gas detection systems.

Datasheet
(PDF)