Gas chromatograph four major cleaning and maintenance

1. Purging and cleaning instruments

　　gas chromatographAfter shutdown, open the instrument side panel and rear panel and use instrument air or nitrogen. Purge the dust on the instrument, and use a soft brush to deal with the dusty or difficult to blow. After cleaning is complete, scrub the instrument where it is contaminated with water or solvent. For water-soluble substances, you can wipe with water first, and the place that cannot be cleaned can be treated with solvent. For materials that are insoluble in water or may react chemically with water, clean the reacted material with a solvent that does not react with it.

2. Circuit board maintenance and cleaning

Before the gas chromatograph is ready for service, cut off the power supply of the instrument and purge the circuit board and circuit board slot with instrument air or nitrogen. When scanning, carefully clean the dust part of the circuit board and slot with a soft brush. Try to wear gloves when operating. Static electricity or sweat on your hands can affect some components on the circuit board. After the cleaning work is completed, carefully observe the use of the circuit board to see if the printed circuit board or electronic components have obvious corrosion. Use absorbent cotton dipped in alcohol to carefully wipe the contaminated electronic components and printed circuits on the circuit board. Also wipe the circuit board interface and socket.

3. Cleaning of injection port

During maintenance, the gas chromatograph inlet glass liner, diverter plate, inlet shunt line, EPC and other components. Cleaning is possible. Cleaning of glass liner and splitter plate: carefully remove the glass liner from the instrument, carefully remove the glass wool and other impurities in the liner with tweezers or other small tools, and do not scratch the surface of the liner during removal. If conditions permit, the preliminarily cleaned glass lining can be cleaned with sound waves in a solvent and used after drying. Can also be directly used such as solvent cleaning, cleaning after drying standby.

4. Cleaning of TCD and FID detectors

The TCD detector may be contaminated by sediment flowing from the column or other substances entrained in the sample during use. Once the TCD detector is contaminated, the baseline of the instrument will jitter and the noise will increase. Clean the detector. The HP TCD detector can be hot cleaned. The specific method is as follows: close the detector, remove the chromatographic column from the detector connector, insert the detector connector into the column box, set the reference gas flow rate to ~ ml/min, set the detector temperature to °C, and heat and clean For ~ h, use after cooling. The following methods can be used for contamination of domestic or Nissan TCD detectors.