The error analysis and correction of orifice meter scale

Abstract: the orifice meter scale error analysis and correction of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: the orifice meter is a kind of flow measurement instrument is widely used in chemical industry. It during the installation, use and maintenance, as well as a lot of shortcomings, thus easy to generate the flow measurement error. Based on the research of the orifice flowmeter, it is concluded that caused flow measurement. More flow meter manufacturers choose model price quote you are welcome to inquire, below is the orifice meter scale error analysis and correction of the article details. Orifice flowmeter is a kind of flow measurement instrument is widely used in chemical industry. It during the installation, use and maintenance, as well as a lot of shortcomings, thus easy to generate the flow measurement error. Based on the research of the orifice flowmeter, it is concluded that the flow measurement error caused by various reasons and related elimination method; And through the compensation and technical renovation measures such as the measurement error of the fixed, so as to ensure the accuracy and effectiveness of the flow measurement. For the accurate measurement of orifice flowmeter has a certain guiding role. 0 introduction at present, in the process of industrial production, the vast majority of the flow measurement is a device with a standard throttling orifice plate and supporting the use of pressure difference transmitter [ 1 - 2] 。 Although the accuracy of intelligent differential pressure transmitter zui up to 0. The class of 075 [ 3] , but due to various reasons, its measurement error often is very big, will it as industrial measuring instrument for use, this problem is particularly prominent. Therefore, to find the causes of measurement error and overcome way, has very important practical significance. Orifice meter is mainly composed of orifice plate, guide of pipe pressure and differential pressure transmitter. Orifice flowmeter is throttling element, it will be converted into the differential medium flow. The differential size and transmission pipeline to bellows is negative pressure chamber, differential pressure transmitter is negative pressure chamber isolation diaphragm by silicone oil filling liquid pass differential pressure measuring diaphragm, has left some measuring diaphragm deviation. Measurement of differential capacitance diaphragm as the capacitive differential pressure transmitter a electrode, and two fixed electrode differential capacitor. Measuring about migration to change the size of the differential capacitance of the diaphragm, the differential capacitance to the differential pressure transmitter circuit, then transform into 4 ~ 20 ma standard signal enlargement, and displayed in the form of traffic. 1. 。 The causes of measurement error and eliminating measures, in a nutshell, measurement error is mainly by the installation is not standard, not as good as or wrong operation maintenance, working condition of process system or change the three causes. 1. 1. 。 Orifice plate installation irregularities while standard orifice throttling device design calculation is summed up through experiment [ 5] , don't need the actual calibration can be put into use directly, but during the installation process is not possible, the following specification even errors, which may lead to a measurement error. Straight pipe before and after the orifice plate is not in conformity with the requirements: the role of the straight pipe before and after the orifice plate is in order to guarantee the stability of the flow of the fluid in the pipeline, but often turn on due to the process piping, bifurcate, meet resistance, make the fluid from stable disturbance, resulting in measurement errors. Elimination method is in accordance with the requirements for the straight pipe before and after, reasonable design of the installation position of the throttle device. Orifice plate piece of upstream and downstream surface damaged or orifice flange gaskets protruding pipe: in the transport orifice or construction personnel in the process of the orifice plate installation, easy to cause surface damage or a convex flange gasket pipe upstream and downstream, resulting in measurement errors. Elimination method is to improve the technical quality of the construction personnel and sense of responsibility. Construction personnel in the inspection hole carefully before install the orifice plate, if discover the orifice plate piece of upstream and downstream surface is damaged, should be replaced in a timely manner; The installation should avoid to damage the hole in the process of orifice plate; When installing the flange gasket, want to make the center line of the flange gasket and the center line of the pipeline. Standard orifice plate surface of upstream and downstream of the reverse loading: before installation, should correctly identify the direction of the flow direction of medium in pipeline and the orifice, otherwise will lead to the measured value is low. This is because the workers' carelessness, eliminate way is when installing a orifice plate, make it says on the orifice plate. 。 +。 。 The surface at the upstream side of flow. 。 。 Different orifice plate is installed wrong location: particularly prone to this kind of situation in commissioning phase. In the trial stage, the process piping to scavenging for many times, frequent disassembling orifice. If the orifice size, slightly do not pay attention to errors will occur and change the orifice plate can be back to normal. 1. 2. 。 Install non-standard pipeline role is mainly used to pass the pipeline orifice differential pressure. Install non-standard pipeline will cause the pressure side of the differential pressure transmitter generate additional error, resulting in a measurement error. According to the relevant provisions of the general technology of laying pipe length should be between 3 ~ 50 m. Too short, pipeline flow measuring volatility; Too long, are produced by measuring hysteresis. When measuring the liquid flow, should guarantee the pipeline laying horizontal one. 。 12 grade, make the pipe full of liquid, lest produce measurement error. Elimination method is in accordance with the technical regulations and design and construction. In the measurement of steam flow, Chiang kai-shek pipeline suction side condensate can take high pressure end range. This kind of situation will produce additional static error. Elimination method for the correct installation condensing tank, to ensure the high pressure end. When designing way of selecting pressure pipeline, according to the measured medium is liquid, gas or steam is different, must be in accordance with the relevant principles of design.

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