Hydrogen Detector - NP-18SHM

N.E.T. SRL

Detects and measures flammable gases and vapours in air
Monitors combustible gases in air or atmospheres with oxygen
Inexpensive and effective for Methane and other hydrocarbons
Excellent long term zero and sensitivity stability
Compatible with a wide range of gas detection systems

The NP-18SHM is a catalytic (pellistor) type flammable gas sensor supplied as a matched pair of elements mounted in a single header and protected by a metal mesh enclosure. It detects and measures the presence of flammable gases and vapours in air, in the range 0-60% of the Lower Explosive Limit (LEL) of the gas or vapour being measured.
It is designed as a lower cost alternative to the twin-header NP-18SMM device and may be used as the sensing platform in fixed flammable gas detection systems. It exhibits excellent long term zero and sensitivity stability and a high level of resistance to catalytic poisons. It requires no trimming resistor to enable the detector to be matched with a compensator.
The sensor operates on the principle that when a combustible gas/air mixture is in contact with the catalyst surface, maintained at about 500°C as current is passed through it in a Platinum coil, combustion occurs. The heat generated increases the temperature of the bead, which in turn changes the resistance of the coil.
The resistive signal change produced is proportional to the gas concentration and can be measured by using the coil as a temperature thermometer in a standard Wheatstone bridge circuit. It is compatible with a wide range of commercially available gas detection systems and remote flammable gas detector heads.

Use Cases

Fixed flammable gas detection systems

Capabilities

Detection of flammable gases and vapours in air up to 60% of LEL.
Provides resistive output signal proportional to combustible gas concentration.
Operates only in atmospheres containing oxygen.
Suitable for use as sensing platform in fixed flammable gas detection systems.
Low humidity and temperature dependence as per datasheet characteristics.

N.E.T. SRL

N.E.T. S.r.l. (Nano Environmental Technology) is an Italian manufacturer of gas sensing devices, producing and supplying a range of gas detection sensors and components on an OEM basis for industrial and commercial applications. The company’s products include electrochemical cells, NDIR sensors, and catalytic bead pellistors, and it holds ISO 9001 certification as well as various industry-recognized certifications. The headquarters and production are based in Milan, Italy.

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