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(1) Gas source preparation
Pre-prepared high-pressure cylinders (usually available in large and medium-sized cities) that require gas. Zhuang’s gas cylinders can only hold such gases. The color of each cylinder represents a gas and cannot be exchanged. Generally, three gases of nitrogen, hydrogen and air are used, and each cylinder is ready for two cylinders for use. Some plants use hydrogen generators and air compressors, but air compressors must be oil-free. When the cylinder pressure drops to 1~2Mpa, the cylinder should be replaced. Generally, the manufacturer can use 99.99% of the above gas, and the electron capture detector must use a high purity gas source of 99.999% or more.
(2) Gas source purification
In order to get rid of the moisture, ash and organic gas components that may be contained in various gases, the gas should be strictly cleaned before it enters the instrument. If all the cylinder gas is used, some chromatographs are equipped with a purifier, and the inside is filled with 5A molecular sieve, activated carbon, silica gel, which can basically meet the requirements. If a general hydrogen generator is used, the water purification treatment must be strengthened, so the drying pipe area should be increased (the volume is more than 450 cubic centimeters, the filler is preferably 5A molecular sieve), and the volume after the generator is larger. The reservoir barrel reduces or overcomes the effects on the instrument baseline when the source pressure fluctuates. If an air compressor is used as the air source, the air inlet of the air compressor should be reinforced with air filtration, and the volume of the purification pipe should be increased. Half of the 5A molecular sieve and half of the activated carbon should be filled in the drying pipe. Generally, domestic oil-free gas compressors can meet the needs.
This is the end of the introduction of Special gas chromatograph gas source preparation and purification. I hope it can help you.
