H2 Specific Sensor/Transmitter

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    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.

    • 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
    • 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

    Specifications subject to change without notice.
    Made in the USA

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