In the process of using the composite gas detector, in order to ensure safety, it is necessary to conduct regular self-inspection. The self-test of the composite gas detector refers to the self-test process of automatically starting or artificially triggering the execution of a pre-prepared detection program and giving corresponding instructions and diagnosis. Do you know what the common composite gas detector self-test includes? The following is a brief introduction by yi yun Tian:

Common composite gas detector self-test includes the following aspects:

1, POST

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When the composite gas detector is powered on or reset, the composite gas detector performs a self-test, which will not be performed in the subsequent measurement and control process, the items of power-on self-test 1 generally have panel display device self-test, RAM and ROM self-test, input/output channel self-test, bus self-test and keyboard self-test, etc.

2, keyed self-test

some compound gas detectors are set a self-test button on the panel, the self-test procedure is initiated by operator control. This self-checking mode is simple and convenient, and can find an appropriate time for self-checking in the process of measurement and control, without interfering with the normal measurement and control work.

3. Periodic self-test

one-time self-inspection, Moreover, the self-inspection project cannot include all the key components of the composite gas detector, so it is difficult to ensure the reliability of the composite gas detector during operation. Therefore, most of the composite gas detector system in the process of operation, to constantly, periodically insert self-test operation. This self-test is completely automatic and is completed during the intermittent period of the measurement work without interfering with the normal measurement and control tasks. Unless a fault is detected, the periodic self-test is not detected by the operator.

To sum up, we can see that the common self-test of composite gas detector includes 3 aspects: power-on self-test, keying self-test and periodic self-test. Through self-test, if the composite gas detector system fails, it can automatically detect and diagnose the fault, that is, self-test, and remind the operator to pay attention, so that the impact can be reduced to a minimum to ensure the entire composite gas detector Safe and reliable operation.