Gas alarm how to use a standard gas for calibration

Combustible gas alarm no matter which kind of combustible gas factory use, you use isobutane standard, as long as correct, calibration procedures to complete, the instrument to the standard gas has the correct response. Such as: 0.8% = 0.8% lel, hydrogen is set, calibration, return to the measuring state value is how much. Instrument use the catalytic combustion principle of the sensor, with isobutane to make access to the underlying instrument, after hydrogen in concentration lel (lower explosive limit %) under the condition of same hydrogen response values than isobutane, because of the lower explosive limit of hydrogen is higher than isobutane. For example: isobutane do calibration, you use the 0.8% hydrogen (20% lel) measured must be more than 25% lel. Instead, you use the hydrogen to make the underlying instrument, measurement with the concentration of isobutane that response value affirmation is low. Relationship but this response in the same concentration of different kinds of combustible gas is relative, the same instrument of isobutane, hydrogen, methane, you might say, how much is the display value, but for a manufacturer of the instrument is less absolute, but size measured values corresponding relationship between gas exists. But there are exceptions, only for the individual manufacturer instrument the gas response, are there other kinds of combustible gas is no response, the sensor is selective.

Gas alarm sensor sensitivity in the detection is a very good method, can use plastic bags to get some air around the sensor, and then the gas distributing around the sensor, the sensor and hard. This is a very quick and easy process, this method is very effective for the difference between true alarm and false alarm. For gas detector calibration, the accuracy is not very important, because it is not analytical equipment or system, but the necessary calibration is necessary. In order to reach a satisfactory precision, the balance of the target and the background environment gas mixture is one of the best calibration gases