GB/T 5275.4-2014 in English

《GB/T 5275.4-2014气体分析 动态体积法制备校准用混合气体 第4部分：连续注射法》由TC206（全国气体标准化技术委员会）归口，TC206SC1（全国气体标准化技术委员会气体分析分会）执行，主管部门为中国石油和化学工业联合会。
GB/T5275的本部分规定了从纯气或其他混合气体通过注射器向平衡气中连续注入校准组分,从而连续制备含两种或多种组分的校准用混合气体的方法。
使用预混气体代替纯气(参见附录 A)可制备体积分数很低的混合气体。体积流量决定体积分数,可通过单个气体的流量计算得到,也可采用ISO6145-1给出的适当方法独立测量。
连续注射法的优点是可连续制备大量混合气体,并且只要使用适当数目的注射器或单只注射器内含有已知的多组分混合气体,就可像制备二元混合气体一样方便地制备多组分混合气体。该方法还可通过很少的步骤,便捷地增高校准组分在混合气体中的体积分数。因此,也可用于评估气体分析仪的一些其他特性,如最低检出限、盲区以及精确度。该方法制备的二元混合气体(包含因子k=2)相对扩展不确定度为5%,适用范围为10-5~10-2(体积分数)。

Scope

This part of GB/T 5275 specifies the method of continuously injecting calibration components from pure gas or other mixed gases into the balance gas through a syringe, thereby continuously preparing a mixed gas containing two or more components for calibration. Using premixed gas instead of pure gas (see Appendix A) can prepare mixed gas with very low volume fraction. The volume flow determines the volume fraction and can be calculated from the flow of a single gas or can be measured independently using an appropriate method given in ISO 6145-1. The advantage of the continuous injection method is that a large amount of mixed gas can be prepared continuously, and as long as an appropriate number of syringes are used or a single syringe contains a known multi-component mixed gas, multi-component mixed gas can be prepared as conveniently as binary mixed gas. mixed composition. This method can also conveniently increase the volume fraction of calibration components in the mixed gas through few steps. Therefore, it can also be used to evaluate some other characteristics of gas analyzers, such as the minimum detection limit, dead zone and accuracy. The relative expanded uncertainty of binary gas mixture prepared by this method (inclusion factor k=2) is 5%, and the applicable range is 10^-5~10^-2 (volume fraction).