If there is no change in the detection signal after the gas chromatograph is injected, the instrument will not show a peak and the output will still be a straight line. When this happens, it should be carried out one by one in the order from the sample syringe to the inlet to the detector. an examination:
1. First check if the syringe is clogged. If there is no problem, please proceed to the next step.
2. Check whether the graphite gasket of the inlet and detector is tight and airtight;
3. Then check the column for leaks and leaks;
4. After zui, observe whether the detector exit is unblocked.
5, the smooth exit of the detector is very important, some people will encounter such problems in the work: the previous day the instrument work is still normal, the next day after the start, there is no response peak signal. Check that the inlet, syringe, gasket and column are all normal, but there is no peak. Unintentionally, the inlet pressure of the inlet is not up to the set value, and it is always high. It is suspected that the ECD tester exit is not Unblocked. Since the emissions of ECD have a certain amount of radioactivity, the ECD outlet is led to the outside. At that time, it was the turn of autumn and winter. After the rainwater entered the ECD discharge port, it was frozen. As a result, the ECD exit of the instrument was blocked, the stigma was high, and the gas could not flow in the gas path, so it could not carry the sample to the detector, so it was not. Out of the peak.
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