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CLE-0644-400 / 4-H2-40000 hydrogen (H2) sensor with a nominal measuring range of 0-40,000 ppm H2. Sensor component only, not a standalone smoke or fire alarm.
Model and selection
- Part number: CLE-0644-400 (CLE0644400)
- Sensor model: 4-H2-40000 (marked 4H2-40000 on the pictured label)
- Target gas: Hydrogen (H2)
- Nominal range: 0-40,000 ppm H2
Match the full sensor marking, connector arrangement and instrument requirements before ordering. Matching the gas or housing shape alone does not establish compatibility. Installation and calibration should follow the instrument manufacturer's instructions.
The manufacturer recommends PCB sockets and advises against soldering directly to the sensor pins.
Manufacturer reference: Classic Line 4-H2-40000 datasheet.
Need help matching it? Send the old sensor label and instrument model for a model check.