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为保障石油化工等行业的安全生产、实现对大气中污染气体的实时监测,各类气体检测仪、报警器获得广泛应用。本文结合实际检定工作,针对各类气体检测仪检定规程的共性问题进行探讨,指出“示值误差”的真正含义是系统测量误差的一个分量并分析了检定时气体标准物质的选择;规程中“仪器的重复性”一词并不严谨,应为“测量的重复性”;某些规程虽然对检定过程中环境温度波动无要求,但在检定过程中环境温度应尽量保持稳定;对一些数字式气体检测仪,报警动作值就是设置值,其报警误差为零;各类气体检测仪规程中对漂移的要求均低于相关国家标准。
In order to ensure the safe production in the petrochemical industry and realize the real-time monitoring of the polluting gas in the atmosphere, all kinds of gas detectors and alarms are widely used. In this paper, in connection with the actual verification work, the common problems of verification procedures of various gas detectors are discussed, and the real meaning of “indication errors” is pointed out as a component of the measurement error of the system and the choice of gas standard materials during the verification. In the “instrument repeatability ” is not rigorous, should be “repeatability of measurement ”; Although some procedures for the verification process does not require environmental temperature fluctuations, but in the verification process should try to maintain the ambient temperature Stable; for some digital gas detector, the alarm action value is the set value, the alarm error is zero; all kinds of gas detector procedures for the drift requirements are lower than the relevant national standards.