In the use and maintenance of gas chromatograph, need to pay attention to the following points, Xinshengneng as a gas chromatograph sales and maintenance enterprise, for the gas chromatograph has accumulated rich experience, now here to share with you the next gas chromatograph in use should pay attention to the following:
One, the installation and removal of chromatographic column
1. Column installation and disassembly must be carried out at room temperature.
2. Packing tower has ring seal and gasket seal. There are three kinds of ferrule: metal ferrule, plastic ferrule and graphite ferrule, which are not easy to screw too tightly when installing. Gasket type seals require a new gasket each time the column is installed.
3. Whether the two ends of the column are plugged with glass wool. Prevent glass wool and packing from being blown into the air detector by carrier gas.
4. The length of capillary column installation and insertion depends on the instruction of the instrument. The structure of different chromatographic evaporation chambers is different, and the insertion length is also different. It should be noted that, if the use of capillary chromatography column regardless of flow, vaporization chamber and filled column interface at this time and evaporation chamber connected capillary column can not be too much probe, a little beyond the cap.
Two, the ratio of hydrogen to air on FID detector
In a gas chromatograph, the ratio of hydrogen to air should be 1:10. When the hydrogen ratio is too large, the sensitivity of the hydrogen flame detector decreases sharply. Check hydrogen and air flow rate. When you don't have enough hydrogen and one of the gases in the air, you start a fire with a bang, and then you put out the fire, and usually when you light an electric stove, you put it out, and then you light it up again, and then you run out of hydrogen.
3. How to prevent the injection needle from not bending
Many beginners to chromatography often bend the needle and syringe rod because:
1. The injection port of the gas chromatograph is too tight, too tight at room temperature. When the temperature of the vaporization chamber is increasing, the silicone gasket will expand and tighten, and it is difficult to insert it through the syringe.
2. The needle is stuck in the metal part of the injection port.
3. The bending of the syringe rod is caused by too much force during injection. The imported chromatograph carries a injector rack, which is impossible to bend the traditional syringe rod with the injector rack.
4. As the inner wall of the syringe is polluted, push the needle rod to bend during injection.
5. The gas chromatograph must be stable during injection. You could bend the syringe if you're in a hurry. As long as you're good at injecting samples, you'll be fast.
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