Pressure (differential pressure) detection instrument for correct installation and related matters - News - Global IC Trade Starts Here Free Products

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Pressure testing requires a measurement system to be implemented. In order to make accurate measurements, in addition to the correct selection and verification (calibration) of the instrument, you must also pay attention to the correct installation of the entire system. If only the meter itself is accurate, its indication does not fully represent the actual parameters of the measured medium, because the error of the measurement system is not equal to the error of the meter. The correct installation of the system includes the opening position of the pressure tap, the proper laying of the connecting duct and the correct installation position of the meter.
1. The position of the pressure tap is selected (1) to avoid areas where the pipeline is bent, bifurcated, and the stream forms eddy currents.
(2) When there is a protruding object (such as a temperature measuring element) in the pipeline, the pressure tap should be taken in front of it.
(3) When the pressure must be taken near the regulating valve, if the pressure port is in front of it, the distance from the valve should be no less than 2 times; if the pressure port is behind, the distance from the valve should be no less than 3 times. Pipe diameter.
(4) For a wide container, the pressure tap should be in a region where the fluid flow is smooth and there is no eddy current. In short, the position of the pressure tap determined in the process flow should be able to ensure that the process parameters to be selected are measured.
2. The horizontal section of the conduit connecting the conduits should have a slope to facilitate the removal of condensed liquids or gases. When the measured medium is a gas, the duct should be tilted downward toward the pressure tap; when the measured medium is liquid, the duct should be tilted toward the pressure gauge; when the measured parameter is a small differential pressure, tilt The degree can be a little bigger. In addition, if the pipe is turning up and down, the condensing liquid device should be placed at the lowest point according to the medium in the pipe or the venting device should be placed at the highest point to ensure that no condensation is accumulated in the pipe for a long time. Liquid or gas affects the accuracy of the measurement. Condensed liquids or gases should be discharged periodically.
3. Precautions for installation and use of pressure measuring instruments (1) The instrument should be installed perpendicular to the horizontal plane;
(2) The metering point is at the same level as the meter installation, and the correction of the additional height error is considered;
(3) The distance between the installation point of the instrument and the measuring point should be as short as possible to avoid delaying the indication;
(4) to ensure the sealing, there should be no leakage, especially flammable and explosive gas medium and toxic and harmful medium. The instrument shall be supplemented with additional equipment when used in the following cases, but no additional error shall be incurred, otherwise the correction shall be considered.
(1) In order to ensure that the instrument is not affected by the measured medium or the viscosity is too large, crystallization, should be installed with isolation device;
(2) In order to ensure that the meter is not affected by the abrupt change of the measured medium or the pulsating pressure, a buffer is added. Especially in the case of a sharp increase in pressure and a steep drop in pressure, it is most likely to cause the pressure gauge to be damaged and scrapped, and even the spring tube is cracked and a leak occurs;
(3) In order to ensure that the instrument is not affected by vibration, the pressure gauge shall be equipped with a vibration damping device and a fixing device;
(4) In order to ensure that the meter is not affected by the high temperature of the measured medium, a pipe-filling device filled with liquid should be installed;
(5) Special special instruments are strictly forbidden to use, and it is strictly forbidden to carry out measurements on devices without special reliability. It is also strictly forbidden to use ordinary pressure gauges for pressure measurement of special media;
(6) For the newly purchased pressure detecting instrument, before the installation and use, it is necessary to carry out the metrological verification to prevent the vibration, damage or other factors of the pressure instrument from being damaged during transportation.