H2
Gas | Hydrogen |
Formula | H2 |
CAS Number | 1333-74-0 |
Lower Explosive Limit (LEL) | 4.0 Vol.-% |
Relative density | 0.0695 |
Appearance | Colorless Odorless |
Hazards | High flammability Narcotic effect |
The ME1250 Gas Sensor is a remote measuring unit for monitoring gas concentration and is used for explosion protection. The sensor measures the hydrogen concentration in the LEL range. It is suitable for all applications where there is a certain concentration of hydrogen in the ambient air in order to warn of an excessive concentration.
The PPM hydrogen sensor with a higher resolution is suitable for leak detection.
The microprocessor-controlled electronics of the sensor, adapted to the specific properties of the measuring cell, enable fast and reliable signal processing. The measured gas con-centration is transmitted to a Gas Control Panel, which can manage a large number of distributed gas sensors.
Thanks to bus communication, only one cable is required, which can be continued from sensor to sensor. The ME 1250 Gas Sensor is also available with an analogue output signal of 4…20 mA. The measured gas concentration can thereby be processed by other PLC (Programmable Logic Controllers).
The optional relay module expands the ME 1250 Gas Sensor internally with 3 relays for direct switching of signal transmitters without the use of a control panel.
Advantages
- Automatic zero point calibration
- Active noise reduction on the measurement signal
- Linear measurement signal depending on the gas concentration
- High response sensitivity with short response time
- Selective and reliable measurement with a stable measurement signal and zero point
- Temperature-compensated measurement signal
- Long service life
Cross sensitivity
Due to the catalytic measuring principle, all combustible hydrocarbon compounds are measured. If different explosive gases are to be expected at the measuring location, calibration must be carried out on the substance for which the sensor has the lowest sensitivity.
Technical Specifications
Versions
Article code | 12BUS-H2-12 | 1250-H2-12 |
---|---|---|
Description | Gas Sensor ME 1250 Hydrogen H2 Bus communication | Gas Sensor ME 1250 Hydrogen H2 Analogue |
Output signal | Bus communication with gas control panel | Analogue 4…20 mA Load max. 800 Ω at 24V input |
Connection | 4-core cable U72M 1x4x0.6 mm Shielded | 3-core cable U72M 1x4x0.6 mm or CY 0.5 mm2 Shielded |
Topology | Bus, tree or star topology | Star topology |
Power | < 1.0 W | < 1.6 W |
Signal Processing
Accessories
Article Code | Description |
1250-REL | Relay module for single sensor ME 1250 |
1250-AIR-BOX | Ventilation duct add-on box for gas sensor ME 1250 |
1250-AIR-FLOW | Fitting hose connection for gas sensor ME 1250 |
1250-SUP | Mounting plate round pillars for gas sensor ME 1250 |
1250-SCHUTZ | Sun and weather protection for gas sensor ME 1250 |
Consumables
Article code | Description | Lifespan |
---|---|---|
CELL-PEL | Measuring cell for flammable gases | up to 5 years |
Gas concentration
- Catalyst poisons can destroy the measuring cell
- Exposure above 40% LEL requires recalibration
- Exposure above 100% LEL can destroy the measuring cell