The reading provides a comparison of the measured concentration against the LEL concentration of the gas used to calibrate the sensor. Most of the time measurements for combustible gas are given in percent LEL (% LEL). Standard catalytic LEL sensors cannot detect gas if the atmosphere contains too little oxygen. Catalytic LEL sensors require the presence of oxygen in order to detect gas. Hydrogen (H2) can be measured by means of catalytic type percent LEL combustible gas sensors, or by means of substance-specific electrochemical sensors.Ĭatalytic LEL sensors detect gas by oxidizing or “burning” the gas. It’s important not to confuse parts-per-million or percent by volume measurements with percent LEL measurements. (This is equivalent to a range of 0 – 5.0% LEL.)……….Should that be 0–0.05? The typical range for an EC hydrogen sensor is 0 – 2,000 ppm. For situations where you need to take action at a lower concentration, using an electrochemical (EC) toxic gas sensor to measure the hydrogen may be a better approach.
Question: I was just reading your information on gases produced by lead acid batteries and came across this in the “Ask Bob” blog: For LEL range measurement, using a standard catalytic combustible gas (CC) sensor with a range of 0 – 100% LEL is a good approach.
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