Proper installation of pressure gauges
For pressure detection, a measurement system is actually required. To achieve accurate measurements, in addition to the correct selection and verification (calibration) of the instrument, attention must be paid to the correct installation of the entire system. If only the earthquake-resistant pressure gauge is accurate, its displayed value cannot fully represent the actual parameters of the measured medium, because the error of the measurement system does not equal the error of the instrument.
The correct installation of the system includes the opening position of the pressure taking port, the reasonable laying of the connecting conduit and the correct installation position of the instrument.
1. Selection of the location of the pressure take-off port (1) Avoid the area where the pipeline is bent, bifurcated and the vortex is formed by the flow beam. (2) When there is a protruding object (such as a temperature measuring element) in the pipeline, the pressure taking port should be taken in front of it. (3) When the pressure must be taken near the regulating valve, if the pressure taking port is in front of it, the distance from the valve should not be less than 2 times the pipe diameter; if the pressure taking port is behind, the distance from the valve should be not less than 3 times. Pipe diameter. (4) For a wide container, the pressure taking port should be in the area where the fluid flows smoothly and there is no vortex. In short, the position of the pressure taking port determined on the process flow should ensure that the process parameters to be selected are measured.
2. Laying of connecting ducts
The horizontal section of the connecting pipe should have a certain slope to facilitate the removal of condensed liquid or gas.
When the medium to be measured is a gas, the duct should be tilted low toward the pressure taking port; when the medium to be measured is a liquid, the duct should be tilted toward the pressure measuring instrument; when the measured parameter is a small differential pressure value, the tilt The degree can be slightly larger. In addition, if the pipe is turning up and down, according to the medium in the pipe, a condensate draining device should be installed at the lowest point or an exhaust device should be installed at the highest point to ensure that condensation does not accumulate in the pipe for a long time Liquid or gas affects the accuracy of the measurement. Drain condensed liquid or gas regularly
