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目前,能在流量计工作时对整个流量范围进行标定,可消除不确定度,提高可靠性和置信度。用双向标准体积管(以下简称标定管)可以消除气体计量的不精确性。用标定管能测试在实际操作条件下的气体流量计的精度。标定管是用于测试液体流量计的一门老技术,只是近来被用于气体流量计。标定管测定的流量计系数指出流量计计量大于或小于真实体积的百分数。
Currently, the entire flow range can be calibrated while the flowmeter is operating, eliminating uncertainty and increasing reliability and confidence. With two-way standard volume tube (hereinafter referred to as calibration tube) can eliminate the inaccuracy of gas measurement. Calibrated tubes can be used to test the accuracy of gas flow meters under actual operating conditions. Calibration tubes are an old technique for testing liquid flowmeters and have only recently been used in gas flowmeters. The flowmeter factor measured by the calibration tube indicates that the flowmeter measures greater or less than the true volume percentage.