Hydrogen Specific Sensor/Transmitter

H2 Specific

RKI Instruments

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.

Quick Overview

    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
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Part # H2 Specific LEL
H2 Specific ppm
Detection Range 0 - 100% LEL 0 - 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 Output 4 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% concentration 20 Seconds to 90% concentration
Operating Environment
Location Indoor or outdoor. Explosion proof for Class I, Div. 1,
Groups B, C, and D.
Temperature -40 to 180° F 15 to 110° F
Humidity 5-95% RH non-condensing
Housing Enclosure: Aluminum Explosion Proof
Sensor: Stainless steel and aluminum
Type Catalytic combustion
with molecular sieve
Metal oxide semiconductor
with molecular sieve
Life Expectancy Over 3 years typical Over 5 years typical
Sensor Current Factory set and sealed
Zero Sets transmitter output to 4 mA
with 0% LEL output from
combustible sensor
Sets transmitter output to 4 mA
with 0 ppm output from sensor
Span Sets 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 Needed Calibration kit, Screwdriver, and voltmeter used to make adjustments.
Calibration Frequency 6 Months 12 Months
One year


* Specifications subject to change without notice.
Made in the USA

Additional Information

Manufacturer: RKI Instruments

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