When the orifice flowmeter is in use, its process pipeline needs to be blown many times, and the orifice flowmeter should be removed and installed frequently. If the dimension of the orifice plate is the same, if you do not pay attention to it, something will go wrong. The upstream and downstream of the orifice flowmeter should be reversed, and the direction of the medium flow in the pipe and orifice flowmeter should be determined during installation, otherwise the measured value will be lower. As a result of carelessness, when installing the orifice plate, the face marked "+" on the orifice plate flowmeter should be placed on the upstream side of the flow direction. The main function of the pressure guide pipe is to transmit the differential pressure signal generated by the orifice flowmeter. The length of the pressure guide pipe should be between 3 and 20 meters. If the length of the pressure guide pipe is too short, the flow measurement fluctuation of its flowmeter will be larger. If it is too long, the measurement lag will occur.

In industrial production process, most of the gas measurement is to use standard throttling orifice meter and differential pressure transmitter is used to form a complete set, although the differential pressure transmitter zui high precision can reach 0.075, but because of various reasons, its measurement error is very big, will be used in industrial measurement of differential pressure transmitter use, this problem will be more obvious. And so on to find the causes of measurement error is overcome by the way, are all has the very vital significance, orifice flow meter to be mainly by the guide tube, orifice, differential pressure transmitter, composed of the orifice flowmeter throttle device component will convert medium flow into differential pressure, differential pressure after pass the pipeline to the bellows is negative pressure chamber, differential pressure transmitter is negative pressure chamber isolation diaphragm is made by silicone oil filling liquid pass differential pressure measuring diaphragm, can make measuring diaphragm or migration.

The upstream and downstream of the orifice flowmeter will be damaged or the flange gasket protruding pipe of the orifice plate will be damaged or the flanged pipe of the flange gasket will be damaged during the process of transporting the orifice flowmeter or construction personnel's installation of the flowmeter. Construction personnel should carefully check the orifice plates before installing the orifice flowmeter. If the upstream and downstream of the orifice plates are found to be damaged, they should be replaced in time. The design of the standard orifice flowmeter is obtained through a large number of experiments, which can be used directly without actual calibration. The orifice flowmeter may be irregular or even wrong in the installation process, which will lead to the measurement error of the flowmeter. The orifice flowmeter does not meet the requirements for the front and rear straight pipe segments, which are designed to ensure the flow stability of the fluid in the pipe. However, the presence of bifurcation, bending and other resistance parts in the process pipe often causes the fluid to change into disturbance due to the stable phenomenon, resulting in its measurement error. The installation position of the throttling device can be designed according to the requirements of the front and rear straight pipe segments.