How to choose the suitable for use the meter scale

Abstract: how to choose suitable for using flow meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. How to choose suitable for the sustainable development of domestic economy and national use of flowmeter series of measures to save energy consumption, more promoted the demand of the flow meter. Especially in the city gas, gas, steam and other various types of media used in industry measurement and single. More flow meter manufacturers choose model price quote you are welcome to inquire, here's how to choose suitable for use of flow meter scale article details. How to choose suitable for the sustainable development of domestic economy and national use of flowmeter series of measures to save energy consumption, more promoted the demand of the flow meter. Especially in urban natural gas, coal gas, steam and other various types of media used in industry measurement and each single internal cost accounting measurement, are in urgent need of wide range, high precision, high reliability of measuring instrument. Differential pressure flowmeter with its mature technology, simple structure, no moving parts, stable and reliable, to adapt to the advantages of wide solitary flow meter. Differential pressure flow meter of the differential pressure flow meter has the following three ways: 1, one-piece differential pressure flowmeter throttle device, differential pressure, pressure, temperature, calculation shows the integration as a whole flow meter. Can display flow directly from the table, also can through the 4 - Far eastone 20 ma current measurements. 2 an integral differential pressure flow transmitter, differential pressure transmitter directly mounted to the throttle device, 4 - the size of output on behalf of the differential pressure signal 20 ma electrical signals, flow calculation and temperature and pressure compensation and configured by the user. 3 respectively by throttling device, differential pressure transmitter, pressure transmitter, temperature transmitter, flow calculation of display. Also known as fission type differential pressure flow meter. Third one is the traditional way of differential pressure flowmeter, use has dropped sharply in recent years. 2 way cannot be called a flowmeter, it does not flow to display or output, commonly referred to as an integral differential pressure flow meter. It is suitable for use as control system of field instruments. The 4 - Differential pressure signal to the control system of 20 ma, calculated by control system, it is concluded that measured flow. 1 kind is a real sense of differential pressure flowmeter, the one-piece differential pressure flowmeter contains all elements of the essential qualities of a meter. Also represents the development direction of differential pressure flow meter. Choose the general principles of the flowmeter to correctly effective method selection of flow measurement and instrumentation, must be familiar with instrument and measurement by the fluid properties. At the same time must also consider economic factors, in general there are 5 main factors: the performance requirements, fluid properties, installation requirements, environmental conditions and high and low cost. For a particular use place meter may have a variety of programs available now, if only by past experience, when the choice or consider a factor and rushed to make a decision, it may lose choose zui suitable instrument. But be integrated these factors put forward zui optimal solution is not a simple thing to do. The following based on our many years of accumulation of give you some advice, for everyone in the selection of flow timing reference. 4 accuracy is a flow measuring accuracy is very important indicator, is also easy to overlook the important index in the process of selected tables. Easy to overlook here refers to the user when the selected tables on accuracy of companies did not consider for deep step. Manufacturer for the accuracy of the label on a table, the selected tables need for deep step to consider the question is: when the error is guided with the percentage of error (5 Measuring upper limit or range of percentage) The relative error. In the field use of temperature, pressure and the change of environment conditions will generate additional error. When choose, should pursue meter integrated system error, can not superstitious single precision index. 6 the manufacturer of accuracy degree is the common sense to. Some manufacturer will insert type vortex, turbine, venturi plug-in measurement point, such as flow meter as & plusmn; 1% or & plusmn; 1. 5%. Is clearly irrational, belongs to will be inserted into the head of the velocity measurement precision spread to all of the flow measurement precision. 3, in addition to the standard throttle device of all flow meter is the standard flow meter, the factory must be made to get real flow calibration for flow coefficient, so must to know something of standard device. Ideal flowmeter in the industrial site work for fully developed turbulent flow field, so want to be in the fully developed turbulent flow standard device for solid flow calibration instrument constants and accuracy level have a practical use. 4, said that the selection of flow in front of the timing should be the pursuit of it integrated system error, and don't superstitious single precision index. Such as a factory with same air flowmeter calibration is 1%, for steam when measuring, its precision is how many? Is a hard question to answer, choose different manufacturers table, the result will be very different. Vapor density in the main problems on the calculation of each manufacturer and various flowmeter are quite different, and even some flowmeter do not differentiate between superheated steam and saturated steam, they mix into a pool, it will not be able to talk more accuracy. Is given with poor zui density value calculation, the working condition of temperature, pressure fluctuation bring dozens of percentage error is not surprising.

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