Instrumentation and maintenance methods for common gas chromatographs

Abstract: Information on the maintenance methods of common gas chromatographs in instruments and meters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Gas chromatographs are often used for quantitative analysis of organic substances. After the instrument has been running for a period of time, due to static electricity, it is easy to absorb a lot of dust inside the instrument; in addition to dust accumulation on circuit boards and circuit board sockets, they are often connected with some organic substances. Vapors are adsorbed on. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the maintenance methods for common gas chromatographs in instruments. Gas chromatographs are often used for quantitative analysis of organic substances. After the instrument has been running for a period of time, due to static electricity, it is easy to absorb a lot of dust inside the instrument; in addition to dust accumulation on circuit boards and circuit board sockets, they are often connected with some organic substances. Vapors are adsorbed together; because the freezing point of some organics is low, solidified organics are often found at the injection port. After a period of use, the inner diameter of the split line becomes thinner and even blocked by organics; during use, the TCD detector is very It may be contaminated by organic matter; the FID detector is used for organic matter analysis for a long time, and organic matter is deposited at the nozzle or collector position or carbon deposition in the nozzle and collector electrode often occurs. 1. Purging and cleaning inside the instrument (Henan, Hubei, Hunan Agilent gas chromatograph / gas chromatograph maintenance) After the gas chromatograph is stopped, open the side and rear panels of the instrument, and use instrument air or nitrogen to purge the dust inside the instrument, Use a soft brush to deal with places with a lot of dust or not easy to blow. 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 in the process of wiping the instrument, no corrosion or secondary pollution can be caused to the surface of the instrument or other components. 2 Maintenance and cleaning of circuit boards (Henan, Hubei, Hunan Agilent gas chromatograph / gas chromatograph maintenance) Before the gas chromatograph is ready for maintenance, cut off the power of the instrument, first purge the circuit board and circuit board slot with instrument air or nitrogen , When purging, use a soft brush to carefully clean the dusty parts of the circuit board and the slot. 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 obviously corroded. Carefully wipe the electronic components and printed circuits contaminated with organic substances on the circuit board with absorbent cotton dipped in alcohol, as well as the interface and socket parts of the circuit board. 3. Cleaning of the injection port (Agilent gas chromatograph/GC maintenance in Henan, Hubei and Hunan) During maintenance, the glass liner, split plate, split line of the injection port, EPC and other components of the gas chromatograph inlet It is necessary to clean them separately. Cleaning of glass liner and split 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 the removal process. If conditions permit, the preliminarily cleaned glass liner can be cleaned with ultrasonic waves in an organic solvent and dried before use. 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 clean it, then use an alcohol solvent such as methanol to clean it, 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, part of the organic matter solidifies 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 maintenance 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 to clean the shunt pipeline. For the shunt pipeline with serious blockage, it is sometimes difficult to clean it by simple cleaning method, and some other auxiliary mechanical methods are needed to complete it. The shunt pipeline can be simply dredged by selecting a steel wire of suitable thickness.Then wash with organic solvents such as acetone and toluene. Since it is not easy to make an accurate judgment on the situation of the splitting part in advance, it is very necessary to clean the splitting pipeline during the maintenance process for the gas chromatograph with manual splitting. For a gas chromatograph with EPC controlled split flow, due to long-term use, it is possible that some fine injection gaskets may enter the interface between the EPC and the gas pipeline, which may block the EPC part at any time or cause the pressure of the injection port to change.

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