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保持载气流速的稳定,是保证工业色谱仪长期连续运转中准确工作的控制因素之一。为此目的,通常采用两种方法:一种是在色谱仪柱前加稳流系统,使载气流速在任何情况下恒定不变;另一种是色谱仪的柱前稳压,当色谱系统阻力一定时,保持柱前载气压力恒定,则其流速即恒定不变。一般常用的“氧气减压阀”、“稳压阀”、“压力定值器”等都属于后一种。目前色谱仪载气的稳定主要是采用稳定柱前载气压力的办法。但是,在柱前稳压的条件下,柱出口压力(即大气压力)的自然变化对载气流速的影响常常被人们所忽视,而在某些大气压剧烈变化的情况下,
Maintaining the stability of carrier gas flow rate is one of the control factors to ensure accurate operation of industrial chromatograph in long-term continuous operation. For this purpose, two methods are usually used: one is to add a steady flow system in front of the chromatographic column to keep the carrier gas flow rate constant under any circumstances, and the other is to pre-column the chromatograph, When the resistance is constant, the pressure of the carrier gas in front of the column is kept constant, and the flow rate is constant. Commonly used “oxygen regulator”, “regulator valve”, “pressure setter” and so on belong to the latter. At present, the carrier gas chromatography is mainly stabilized by the carrier gas pressure before the method. However, under the condition of prestack pressure, the influence of the natural change of the column outlet pressure (ie, atmospheric pressure) on the carrier gas flow rate is often neglected. In the case of some atmospheric pressure changes drastically,