As the use time increases, the accuracy of the combustible gas alarm may be affected to a certain extent, resulting in performance degradation or measurement deviation. At this time, it is particularly important to carry out regular calibration work, which can not only restore the combustible gas alarm to a good working condition, but also significantly improve its accuracy and reliability. Therefore, enterprises should regard the calibration of combustible gas alarm as the key link of safety production management, and attach great importance to it. Do you know how to calibrate Combustible Gas Alarm ? The following is a brief introduction by yiyuntian electronics:

the calibration methods of combustible gas alarm mainly include zero calibration, range calibration and linear calibration, etc. the steps, the following is the detailed calibration method:

1. zero calibration

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Environment preparation: select a dust-free, non-corrosive gas, suitable temperature and low relative humidity environment to calibrate the combustible gas alarm.

Alarm status: Put the combustible gas alarm in clean air to ensure that there is no combustible gas in the environment.

Zero adjustment: Adjust the zero point of the combustible gas alarm so that its display value is zero.

Stability observation: Wait for a period of time (such as 5 minutes) to observe whether the value displayed by the combustible gas alarm is stable. If there is a change, repeat the zero adjustment until stable.

2. span calibration

> Calibration gas preparation: prepare the calibration gas that meets the requirements, the concentration should be within the working range of the combustible gas alarm, and the stability should be good.

Connecting equipment: Connect the calibration gas bottle to the gas flow meter, and adjust the gas flow through the pressure reducing valve.

Alarm exposure: Connect the output of the gas flow meter to the sensor interface of the combustible gas alarm to expose the combustible gas alarm to the calibration gas.

observation record: observe the display value of combustible gas alarm, and record the gas flow at this time when the preset alarm value is reached.

concentration reduction: gradually reduce the calibration gas concentration and observe whether the combustible gas alarm display value returns to zero.

Repeat the calibration: Repeat the above steps at least 3 times to ensure the accuracy of the calibration results of the combustible gas alarm.

3. Linearity Calibration

Select the calibration gas: on the basis of the range calibration of combustible gas alarm, several different concentrations of calibration gas are selected for calibration.

Record data: Record the combustible gas alarm display value at each concentration.

Draw a curve: the combustible gas alarm shall draw a corresponding curve between the concentration and the displayed value.

Check adjustment: check whether the curve is linear. If there is any deviation, adjust the combustible gas alarm.

In summary, we can see that the calibration of the combustible gas alarm is a key step to ensure its accuracy and reliability. By following the above calibration methods and steps, the performance of the alarm can be effectively improved, and the possibility of false positives and false negatives can be reduced, so as to better protect the safety of industrial production and daily life.