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在我国工厂常用的流量测量装置中,我们发现:由孔板、差压变送器、电子开方器、比例积算器等合格的若干台仪表组成的流量测量装置测量误差较大。我们运用TQC的方法,经分析研究,认为导致这一系统误差较大的原因是由组成该测量装置的若干台仪表的误差在同方向迭加所造成的。测量装置中若干台仪表是串接的,孔板的输出作为差压变送器的输入,差压变送器的输出又作为电子开方器的输入,依次下去。倘若各单台仪表在校验时均为正方向误差δ_1、δ_2…δ_i,则整个测量装置的系统误差为sum from 1 to nδ_i(或综合误差δ_(max))。为了减小装置的综合误差,我们对仪表进行整套组合校验,力求把各单台仪表的误差在
Flow measurement devices commonly used in our factory, we found: the flow measurement device consisting of orifice, differential pressure transmitter, electronic prescriber, the ratio of totalizer and other qualified instrument measuring device measurement error. We use the method of TQC, the analysis and research, that lead to greater error of this system is caused by the error of several instruments that form the measuring device in the same direction. A number of instruments in the measuring device are connected in series. The output of the orifice is used as the input of the differential pressure transmitter, and the output of the differential pressure transmitter is used as the input of the electronic opener. The system error of the whole measuring device is sum from 1 to nδ_i (or the total error δ_max) if each single meter is a positive direction error δ_1, δ_2 ... δ_i when calibrating. In order to reduce the overall error of the device, we carry on the whole set of verification to the instrument, and strive to put the error of each instrument at