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Thank you in advance. The carrier gas and auxiliary gas lines are separate, and each is equipped with a pressure regulator and gauge. Flow balancing is achieved using needle microvalves or pipes with an internal diameter of 0.25 mm, in order to properly regulate load losses. Connections are made using tubes with a diameter of 2 x 1 mm, and all pathways are kept as short as possible. The gas chromatograph is fitted with a proportional thermoregulator to control the temperature of the thermostatic chamber, replacing the on-off type of regulator which caused problems for the main system when high sensitivity was required.
http://fy.iciba.com can be translated
This is a translation related to a chromatograph. In general, it means that the gas delivery pipeline is installed separately and equipped with a pressure reducer and a pressure gauge. The flow balance is controlled by a micro needle valve and a tube with an inner diameter of 0.25 mm. When the chromatograph operates in high-speed response mode, a proportional thermal regulator is used to control the temperature of the constant-temperature chamber, replacing switches that could cause issues with the piping system. These are my humble opinions; if there are any mistakes, please point them out. Thank you :)