Gas chromatograph often occurs faults and maintenance methods
First, the failure of the chromatographic peak after injection:
The gas chromatograph does not change the detection signal after injection, the instrument does not show a peak, and the output is still straight. In this case, check one by one from the sample syringe, the inlet to the detector.
1. First check if the syringe is clogged. If there is no problem,
2. Check that 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.
Second, the baseline problem:
Gas chromatographic baseline fluctuations and drifts are baseline problems, and baseline problems can increase measurement errors and sometimes even cause the instrument to fail to function properly.
1. When encountering baseline problems, first check whether the instrument conditions have changed, and whether new gas cylinders and equipment accessories are newly replaced.
2. If there are changes or conditions change, it is necessary to check whether the baseline problem is caused by these changes. Generally, this change is often the cause of the baseline problem. Some people have encountered this situation at work: the new carrier gas is not pure enough, and after changing the overload gas, the baseline gradually rises (the baseline is not immediately changed due to the carrier gas purification tube). After the next day, the baseline was very high with strong baseline jitter and all peaks were noisy and could not be detected. After inspection, the problem occurred on the newly exchanged carrier gas, and immediately after the replacement of the carrier gas, it returned to normal.
3. When the above reasons that may cause the baseline problem are excluded, the injection pad should be inspected for aging (it should develop a good habit of regularly changing the injection pad);
4. Whether quartz wool should be replaced;
Third, the failure caused by peak loss:
(1) The situation can be solved by multiple air runs and cleaning air paths (inlet, detector, etc.).
1. In order to reduce the pollution to the gas path, the following measures can be taken: a high-temperature cleaning process should be carried out in the post-programmed zui stage;
2. The sample injected into the inlet should be clean;
3. Reduce the use of high boiling oils;
4. Use as high an inlet temperature, column temperature, and detector temperature as possible.
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