H2 Specific sensor/transmitter
- 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
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.
| Part # | H2 Specific LEL 65-2450RK | H2 Specific ppm 65-2440RK |
| Detection Range | 0 - 100% LEL | 0 - 2000 ppm |
| Min Operating Voltage | 11 VDC | |
| Max Operating Voltage | 30 VDC | |
| Max Current Draw | 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 |
| Response Time | 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 |
| Sensor | ||
| Type | Catalytic combustion with molecular sieve | Metal oxide semiconductor with molecular sieve |
| Life Expectancy | Over 3 years typical | Over 5 years typical |
| Controls | ||
| 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 |
| Warranty | One year on electronics and sensors. | |