In the process of using the gas chromatograph, the operator often encounters the problem of fault maintenance of the gas chromatograph. The main gas chromatograph in this paper is used for simple analysis when the ignition is not normal and the column oven is not properly controlled.
Gas chromatograph maintenance points (2)
The ignition is not normal.
⊙FID, NPD, FPD detectors are not ignitable or difficult to ignite.
§ A. Check whether the carrier gas, hydrogen gas, or air enters the detector, otherwise check the gas path.
§ B. Check if the flow settings of various gases are correct, otherwise reset.
§ C. Observe whether the ignition wire is red, otherwise check if the ignition wire is open or shorted, contact is bad, and check if the shape of the ignition wire is normal.
§ D. When the ignition wire is normal, the FID and FPD detectors observe whether the ignition relay is normal or not, and whether the ignition current is applied to the ignition wire, otherwise check the corresponding circuit part.
§ E, .NPD detector Under the premise of confirming that the bead is normal, observe whether the current regulation is normal, otherwise check the corresponding circuit part.
§ F, check the detector for contamination and blockage.
§ H. Check the inside of the detector for air leaks.
â–²column incubator
â—‡ Composition: blower motor / impeller, automatic rear door, heating wire and its baffle.
â—‡ Action: Install the column and provide temperature conditions for the sample to separate in the column.
The mast should have the following features:
1. Wide temperature control range (-100~400 °C).
2. Temperature control accuracy is good, temperature fluctuation should be <0.1% or less.
3. The effective capacity of the oven should be large enough.
4. The heat capacity is small and the heat preservation effect is good.
5. Large enough heating power (heating rate) 20 ° C / min, generally between 1000 ~ 2000W.
6. Over temperature protection.
7. Automatically open the door.
Discriminate
1. Use a multimeter (ohm file) to measure the resistance of the heating wire to about 30 &.
2. Use a multimeter (ohm file) to measure the resistance of the platinum resistor (25 ° C) is about 110 &.
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