H2 Specific

H2 Specific

  • Explosion proof housing and sensor design
  • H2 specific solid state sensor for 0 – 2000 ppm
  • H2 specific catalytic sensor for 0 – 100%LEL
  • Molecular sieve filter built in; highly specific to H2
  • Eliminates false alarms from IPA and other gases
  • 4-20 mA transmitter, 24VDC
  • Description
  • Application
  • Specifications
  • Download

RKI offers unique proprietary sensor technologies for hydrogen specific detection in either the % LEL or PPM ranges. By utilizing a proprietary molecular sieve coating that is built into both our catalytic or solid state sensors, false alarms from typical hydrocarbon interfering gases are essentially eliminated. For the LEL range, a special catalytic sensor is coated with a molecular sieve that eliminates the response to common background gases like IPA, methane, gasoline, etc. while providing a detection range of 0 — 100% LEL for hydrogen. The hydrogen PPM sensor can reliably detect leaks 20 times smaller than a standard catalytic sensor. This solid state sensor has a molecular sieve coating on the sensing element, which filters out interference from other gases and provides a 0 — 2,000 PPM range. Both the LEL and PPM range sensors are available with 24 VDC transmitters with linear 4-20 mA outputs.

  • Semiconductor
  • Power Plants
  • Fuel Cell Industry
  • R & D applications
  • Gas plants
Part #H2 Specific LEL
H2 Specific ppm
Detection Range0 – 100% LEL0 – 2000 ppm
Min Operating
11 VDC
Max Operating
30 VDC
Max Current
200 mA (power wires)
25 mA (signal wires) 3 wires
100 mA (power wires)
25 mA (signal wires) 3 wires
Signal Output4 mA at 0% LEL
20 mA at 100% LEL
Linear Output
4 mA @ 0 ppm
20 mA @ 2000 ppm
Linear Output
20 Seconds to 90% concentration20 Seconds to 90% concentration
Operating Environment
LocationIndoor or outdoor.
Explosion proof for Class I, Div. 1,

Groups B, C, and D.
Temperature-40 to 180° F15 to 110° F
Humidity5-95% RH non-condensing
HousingEnclosure: Aluminum Explosion Proof
Sensor: Stainless steel and aluminum
TypeCatalytic combustion
with molecular sieve
Metal oxide semiconductor
with molecular sieve
Life ExpectancyOver 3 years typicalOver 5 years typical
Sensor CurrentFactory set and sealed
ZeroSets transmitter output to 4 mA
with 0% LEL output from
combustible sensor
Sets transmitter output to 4 mA
with 0 ppm output from sensor
SpanSets transmitter output to 20 mA
with 100% LEL output from
combustible sensor
Sets transmitter output to 20 mA
with 2000 ppm Hydrogen output
from sensor
Tools NeededCalibration kit, Screwdriver, and voltmeter used to make adjustments.
Calibration Frequency6 Months12 Months
One year
Download datasheet

Driven By Values, Delivering On A Vision.