Overview
Well-known, discharge measures quantity and discharge to change send implement, temperature of the content sex of the fluid that be measured, job, actuating pressure is close together and relevant, present a complex function to concern, the design that this gives discharge appearance, examine, application brings very great difficulty, it is with the flowmeter of reduce expenditure type that applies extensively at present exemple, each flowmeter reduce expenditure diameter of starting a hole must be calculated, and this computation is very trival, the user is right 2 use flowmeter, watches, especially because the calibrating of discharge computer involves complex calculation also times feeling is difficult, so, national level " GB/T2624-93 discharge measures throttle unit to use the canal in orifice plate, nozzle and Wen Qiu to measure the fluid flow that is full of round canal " although already was released old, but carry out a circumstance and not ideal. Especially " SY/T6143-2004 measures natural gas flow with flowmeter of standard orifice plate " , " GB/T2624-2006 is in with installation the buy of poor press fitting in sectional conduit measures the circle to provide fluid flow completely " promulgate in succession after carrying out, its calculation is more complex, if do not have relevant technical measure with with support, of the standard carry out carrying out is an empty talk only.
As the development of electronic technology, especially the computer enters discharge to measure a domain, a lot of complex, look be like the problem that solves hard to become very simple. Same with computational reduce expenditure diameter of starting a hole is exemple, an experienced technical personnel is calculated an orifice plate needs above a long time, but need 1 ～ 2 minutes only with computer computation. Accordingly all sorts of throttle unit design emerge as the times require of software of software, natural gas computation, be a standard carry out carry out offerred a technology to assure, also provided a measure to run appearance government.
Enter 21 centuries to come, the application of discharge computer had very great progress, it is mixed with high operation rate, large memory capacity, strong operation function have communication capacity and be welcomed generally, density of fluid of the computation when it can want to be realistic by the standard, pour out of coefficient, but coefficient of expansion measure flow must parameter, its accuracy is very tall. The level that discharge measures is perfect with each passing day, also had the technical medium that the standard that finish asks at the same time, revising the calibrating rules with regulations of old 2 appearance calibrating or new formulate so is must.
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