Remember to maintain and maintain the Thermo Scientific Gas Chromatograph after use
We should not forget to always maintain the instrument after using the Thermo Scientific Gas Chromatograph. After all, any instrument is inseparable from maintenance and maintenance. Reasonable maintenance methods can effectively extend the life of the Thermo Fisher GC. So what are the maintenance methods for the Thermo Scientific Gas Chromatograph?
The maintenance of the Thermo Scientific Gas Chromatograph is as follows:
1. After the purge and clean gas chromatograph inside the Thermo Scientific Gas Chromatograph is stopped, open the side and rear panels of the instrument, and use the instrument air or nitrogen to purify the dust inside the instrument, which is more or less dusty. The place to be swept is treated with a soft brush. After the purge is completed, scrub the water or organic solvent in the place where the organic matter is contaminated inside the instrument. The water-soluble organic matter can be wiped with water first, and the organic solvent can be used for the place that cannot be thoroughly cleaned. It is not water-soluble or possible. The organic matter that chemically reacts with water is cleaned with an organic solvent that does not react with it, such as toluene, acetone, carbon tetrachloride, and the like. Note that corrosion or secondary contamination of the instrument surface or other components may not occur during the wiping of the instrument.
2. Maintenance of the circuit board and cleaning Before the gas chromatograph is ready for maintenance, cut off the power of the instrument. First, purge the circuit board and the circuit board slot with the instrument air or nitrogen. Use a soft brush to match the circuit board and insert. The dusty part of the tank is carefully cleaned. Wear gloves as much as possible during operation to prevent static electricity or sweat on your hands from affecting some components on the board.
After the purge is completed, the board should be carefully observed to see if the printed circuit board or electronic components are significantly corroded. Wipe the electronic components and printed circuits contaminated with organic materials on the board with a cotton wool, and wipe the board interface and the socket.
3. Cleaning of the inlet During the inspection, it is necessary to clean the glass liner, the split plate, the inlet pipe of the inlet, and the EPC and other components.
Cleaning of the glass liner and the splitter plate: Carefully remove the glass liner from the instrument, carefully remove the glass wool and other impurities from the liner with tweezers or other small tools, and do not scratch the liner surface during the removal process.
If conditions permit, the initially cleaned glass liner can be cleaned with ultrasonic waves in an organic solvent and dried for use. It can also be directly cleaned with an organic solvent such as acetone or toluene, and dried after use.
The shunt plate Zui is an ideal cleaning method which is ultrasonically treated in a solvent and used after drying. It is also possible to choose a suitable organic solvent for cleaning: after taking out the split plate from the inlet, first wash it with an inert solvent such as toluene, then wash it with an alcohol solvent such as methanol, and use it after drying.
Cleaning of the split line: When the gas chromatograph is used for the analysis of organic matter and polymer compounds, the freezing point of many organic substances is low, and some organic substances are solidified in the split line during the process of discharging the sample from the gasification chamber through the split line.
After a long period of use, the inner diameter of the split line gas chromatograph gradually becomes smaller or even completely blocked. After the split line is blocked, the instrument inlet shows abnormal pressure, the peak shape deteriorates, and the analysis result is abnormal. During the overhaul process, the split line needs to be cleaned regardless of whether it is possible to determine whether the split line is blocked or not. The cleaning of the split pipeline generally selects organic solvents such as acetone and toluene. It is difficult to clean the shunt pipeline with severe blockage by simple cleaning, and some other auxiliary mechanical methods are needed to complete. The shunt line can be simply unblocked by selecting the appropriate thickness of the steel wire, and then washed with an organic solvent such as acetone or toluene. Since it is not easy to make an accurate judgment on the condition of the diverting portion in advance, it is necessary for the hand-separated gas chromatograph to clean the shunt line during the overhaul process.
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