Measurement method of orifice meter scale

Abstract: the measuring method of orifice meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 1 natural gas flow metering method in our country natural gas metering usually expressed as a volume, legal units is cubic meters. State of gas flow measurement standards in our country is: absolute pressure of 0. 101325 mpa, temperature is 23. 15℃。 A lot of gas flow metering method, can be. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a measurement method of orifice meter scale article details. 1 natural gas flow metering method in our country natural gas metering usually expressed as a volume, legal units is cubic meters. State of gas flow measurement standards in our country is: absolute pressure of 0. 101325 mpa, temperature is 23. 15℃。 Natural gas flow metering method are many, the available flow meter is very much also, according to the working principle of the roughly divided into: differential pressure flowmeter, volumetric flowmeter, speed meter three types. In terms of measurement standard, at present most countries in the world measurement standard gradually to IS05167 the orifice plate was used to measure of circular tube flow of fluid, gas measurement standard in our country was revised to SY/T6143 - 1996 standard orifice measurement method of gas flow rate. 2 orifice meter automatic measuring the so-called automatic measurement, real-time detection of gas flow metering is to use the transmitter involved parameters of temperature, pressure, pressure, the flow calculation by computer software, realize the whole flow measurement link without artificial participation in natural gas flow measurement. With the development of measurement technology and the popularization of computer use. Realize the automatic measurement of orifice meter scheme is more, at present basically has the following four modes. 2. 1 single variable flow transmitter computer ( Or industrial PC) Use of single variable analog transmitter respectively detect temperature, pressure, differential pressure, and to detect electrical signals into a standard 4 - 20 ma analog signal send traffic computer ( Or industrial PC) The data acquisition card, through the A/D conversion to digital quantity, in the flow computer ( Or industrial PC) By flow calculation software on instantaneous flow and cumulative flow of natural gas and other auxiliary functions. This way is a traditional automatic measurement model, the faults for analog signals for acquisition, transmission, anti-interference ability is poorer, because the problems such as signal conversion is difficult to improve measurement precision, and the hardware is more complex, the intermediate links, poor reliability. Can be extended to: single variable flow transmitter industrial control computer, so as to realize flow are calculated and displayed separately, improve system reliability and visibility. 2. 2 multivariable transmitter flow computer ( Or industrial PC) Using multivariate intelligent variable recursive one device detection, such as temperature, pressure, differential pressure at the same time, adopting fieldbus system, through the digital signal transmission, into the flow computer ( Or industrial PC) After the data acquisition card by flow calculation software on gas instantaneous flow and cumulative flow and other functions. The way to connect the hardware simplified a lot of, improve the reliability and accuracy of the system. But because the transmitter detection measurement signal is not only for data processing, so the school on time must carry out the innovative and flow computer together. By traffic or industrial PC main difference is that flow calculation by computer. Traffic is special curing software in computer calculation and data storage, stable and reliable, high dependability; Independent development of industrial control software to calculate, easily software upgrade and system maintenance, due to the large amount of calculation, especially the multi-channel measurement, a few poor reliability. To increase the reliability of the system and intuitive interface, this approach can be extended to: multivariable transmitter flow computer industrial control, the traffic flow in the computer calculation, on the industrial PC display. 2. 3 more variable intelligent transmitter industrial this way compared with mode 2, the main difference is that the transmitter in curing the flow processing software, allows the transmitter to local display instantaneous measurement parameters and calculate the instantaneous flow, and through the digital signal transmission, into the industrial computer display and implement other functions. The measured flow values must be secondary processing in industrial control, in order to realize the data accumulation and storage capabilities. In this way, to further simplify the system structure, the transmitter can be single school can also be innovative, easy to maintain. But due to the accumulation and storage of traffic in industrial control, poor reliability, easy to cause loss of data. 2. 4 integrated intelligent instrument integration of industrial computer, which make use of intelligent instrument to realize the integration of the transducer and flow computer. Can realize not only their own database, according to the instantaneous parameters and flow and cumulative flow rate and the representation of the historical data; And in the operation of instrument, a variety of power supply security: such as battery, solar energy and external power supply, has realized under the condition of no electricity supply, can become independent measurement system, in situ show that natural gas instantaneous flow and cumulative flow and data storage, reproduction, etc; Under normal circumstances can be connected through the field bus and PC, implementing the digital signal transmission, according to the upload can also be performed on the industrial PC secondary data processing, measuring system composed of more flexible and reliable. In this way, all of the measurement data, makes the system structure is simple, the operation more simple, more reliable and easier maintenance. Not only can be single school can also be innovative. Adopt independent measurement circuit, reduce the data transmission process, improve the accuracy of the measurement.

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