Talking about the cleaning and maintenance method of gas chromatograph

Abstract: A brief introduction to the cleaning and maintenance methods of gas chromatographs is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 1. Purging and cleaning inside the instrument After the gas chromatograph is shut down, open the side and rear panels of the instrument, use instrument air or nitrogen to purge the dust inside the instrument, and use soft wool for places with a lot of dust or not easily purged Brush with processing. After purging is complete. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on the cleaning and maintenance methods of gas chromatographs. 1. Purging and cleaning inside the instrument After the gas chromatograph is shut down, open the side and rear panels of the instrument, use instrument air or nitrogen to purge the dust inside the instrument, and use soft wool for places with a lot of dust or not easily purged Brush with processing. After the purging is completed, scrub with water or organic solvent for the place where there is organic pollution inside the instrument. For water-soluble organic matter, you can wipe it with water first, and for the place that cannot be cleaned thoroughly, you can use organic solvent for treatment. Organics that chemically react with water are cleaned with organic solvents that do not react with water, such as toluene, acetone, carbon tetrachloride, etc. Note that during the process of wiping the instrument, the surface of the instrument or other components must not be eroded or contaminated. 2 Maintenance and cleaning of circuit boards Before the gas chromatograph is ready for inspection, cut off the power supply of the instrument. First, use instrument air or nitrogen to purge the circuit board and circuit board slots. When purging, use a soft brush to cooperate with the circuit board and the slot. Departments with more dust should be 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 circuit board. After the purging work is completed, the use of the circuit board should be carefully observed to see if the printed circuit board or electronic components are significantly corroded. Use absorbent cotton dipped in alcohol to carefully wipe the electronic components and printed circuits contaminated with organic substances on the circuit board, and also wipe the circuit board interface and socket departments. 3. Cleaning of the injection port During inspection, it is necessary to clean the glass liner, split plate, split line of the injection port, EPC and other components of the gas chromatograph injection port respectively. Cleaning of glass liner and split plate: Carefully take out 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 the removal process. If the conditions permit, the preliminarily cleaned glass liner can be cleaned with ultrasonic waves on the top of the organic solvent, and used after drying. It can also be directly washed with organic solvents such as acetone and toluene, and can be used after drying. The ideal cleaning method for the splitter plate is to sonicate it in a solvent and dry it before use. You can also choose a suitable organic solvent for cleaning: after taking out the split plate from the injection port, first use an inert solvent such as toluene to wash, then use an alcohol solvent such as methanol to wash, and use it after drying. Cleaning of the shunt line: When the gas chromatograph is used for the analysis of organic compounds and polymer compounds, the freezing point of many organic compounds is low. During the process of venting the sample from the gasification chamber through the shunt line, some organic compounds are solidified in the shunt line. After the gas chromatograph is used for a long time, the inner diameter of the shunt pipeline gradually becomes smaller, or even completely blocked. After the split line is blocked, the injection port of the instrument displays abnormal pressure, poor peak shape, and abnormal analysis results. In the inspection process, regardless of whether the shunt pipeline is blocked or not, it is necessary to clean the shunt pipeline. Acetone, toluene and other organic solvents are generally used for the cleaning of the shunt line. For the shunt line with severe blockage, it is sometimes difficult to clean it with a simple cleaning method, and some other auxiliary mechanical methods are needed to complete it. The shunt pipeline can be simply dredged by selecting steel wires of suitable thickness, and then cleaned with organic solvents such as acetone and toluene. Because it is not easy to make a correct judgment on the situation of the splitting department in advance, it is very necessary to clean the splitting line during the inspection process for the gas chromatograph with manual splitting. For the gas chromatograph with EPC controlled split, due to long-term use, it is possible that some small injection pads will enter the interface between the EPC and the gas pipeline, which may block the EPC department at any time or cause the pressure of the injection port to change. Therefore, in each inspection process, try to check the EPC department of the instrument, wash it with organic solvents such as toluene and acetone, and then dry it. Due to sampling and other reasons, some organic matter condensation may form on the outside of the injection port at any time. You can use absorbent cotton dipped in acetone, toluene and other organic substances to wipe the injection port initially, and then mechanically remove the organic matter that cannot be wiped off. Be careful not to damage the instrument parts during the process of removing the solidified organics. After removing the solidified organic matter,The instrument parts are then carefully wiped with organic solvents. 4. Cleaning of TCD and FID detectors TCD detectors may be contaminated by sediment effluent from the column or other substances entrained in the sample during use. Once the TCD detector is contaminated, the baseline of the instrument appears jittery and noise increases.

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