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Gas Detectors

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

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Description Vendor
  • 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. SRL (Nano Environmental Technology), founded in 2001 and headquartered near Milan, Italy (ISO 9001 registered since 2003), was established with the mission of setting new standards in gas sensing technology through high quality, excellent technical support, competitive pricing, and short delivery times, manufacturing and selling a complete range of gas sensing devices on an OEM basis for industrial and commercial applications used by instrument manufacturers worldwide. The company's microprocessor-based range of non-dispersive infrared (NDIR) sensors includes solutions for detecting hydrocarbons, CO2, SF6, and refrigerant gases, with the new IR sensor technology entirely designed and manufactured at N.E.T.'s headquarters outside Milan, applying gas detection expertise relevant to hydrogen production and process monitoring applications requiring reliable trace gas detection. N.E.T. has assembled a dedicated team of engineers and market specialists with extensive experience in gas detection, providing constant product innovation and high-level technical/commercial support to instrument manufacturers who incorporate N.E.T.'s OEM gas sensing modules into their own hydrogen-related detection and monitoring systems. Having exhibited at the Hydrogen Technology World Expo in Hamburg, Germany, N.E.T. SRL continues supplying NDIR gas sensing technology as an OEM component supplier to the broader industrial gas detection and hydrogen monitoring equipment manufacturing ecosystem.
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