In the orifice plate flowmeter use stage, its process pipeline needs many times of blowing, it is necessary to frequently disassemble and install the orifice plate flow meter. If the size of the orifice plate is the same, a little carelessness will be a mistake, swap the orifice plate flowmeter will appear normal phenomenon. The upstream and downstream face of the orifice flowmeter is installed backwards, when installed to determine the direction of media flow in the pipeline and the direction of the orifice flow meter, or it will lead to a low measurement value. Because of carelessness and lead to, in the installation of the orifice plate, to make the orifice plate flowmeter marked with "+" face in the upstream side of the flow direction. The main role of the conductive pipeline is used to transmit the differential pressure signal generated by the orifice flowmeter, the length of the conductive pipe should be laid between 3 and 20 meters distance, the conductive pipe if too short, the flowmeter flow measurement fluctuations will become larger; if too long, it will produce measurement lag phenomenon.

In the industrial production process, most of the gas measurement are standard throttling integral orifice flow meter and differential pressure transmitter to match the use, although the highest accuracy of differential pressure transmitter can reach 0.075, but because of various reasons, the measurement error is also very large, the differential pressure transmitter used in industrial metering, this problem will be more obvious. So in finding the causes of measurement errors and ways to overcome them, are of great importance, orifice flowmeter is mainly composed of pressure guide tube, orifice plate, differential pressure transmitter, orifice flowmeter throttling device components will convert the medium flow into differential pressure, differential pressure after the pressure guide pipeline transfer to the differential pressure transmitter diaphragm box positive and negative pressure chamber, positive and negative pressure chamber isolation diaphragm is through the silicone oil filling fluid will Differential pressure is transmitted to the measurement of the diaphragm, can make the measurement diaphragm left and right offset.

Orifice plate flow meter its upstream and downstream surface will be damaged or orifice plate flange gasket protruding out of the pipe, in the transportation of orifice plate flowmeter or in the construction personnel in the process of installing the flowmeter, will cause the upstream and downstream surface damaged or flange gasket protruding out of the pipe, will cause the flowmeter has measurement error. Construction personnel in the installation of the orifice plate flowmeter before should carefully check the orifice plate piece, if the orifice plate piece upstream and downstream surface is found to be damaged, should be replaced in a timely manner. Standard orifice flowmeter design is derived from a large number of experiments, it does not require actual calibration can be used directly, orifice flowmeter in the installation process may not be standardized or even wrong, which will lead to the flowmeter measurement error. Orifice type flow meter its front and rear straight pipe section has not meet the requirements, front and rear straight pipe section is to ensure that the flow of fluid in the pipeline is stable, but because the process pipeline often have bifurcation, bend and other resistance parts, will make the fluid due to the phenomenon of stability into a disturbance, thus leading to its measurement error. You can use the front and rear straight pipe section requirements to reasonably design the installation position of the throttle device.

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