How to install pressure transmitter

Do you know how to install the pressure transmitter on site? The editor has analyzed a few points according to the situation, I hope it can be helpful to everyone! 1. The field-installed direct-connected pressure transmitter can be directly installed on the pipeline using M20×1.5 or NPT1/2 external thread, and the tightening torque shall not exceed 30ft-1bs (or 40N.m); direct-connected liquid level pressure transmitter The device can be directly put into the liquid level for use, and there are three installation modes: local, bracket and flange. The pressure transmitter should be installed in a place where the temperature difference changes as little as possible, while avoiding vibration and shock. When installing in the open air, the pressure transmitter should be placed in a ventilated and dry place as much as possible to avoid direct sunlight and rain, otherwise it will reduce the performance of the whole machine and affect the life of the whole machine. When installing the pressure transmitter, be sure to consider the following situations: (1) Avoid direct contact of strong corrosive media with cables (2) Prevent residues from precipitating or clogging in the probe or pressure pipe (3) The pressure pipe should be (4) The pressure transmitter or pressure pipe should be installed in a place where the temperature difference changes little. When wiring the pressure transmitter, the signal line should not pass through the line pipe or open wire groove together with other power lines, and it should not be used in high-power pass near the device. When measuring steam or other high temperature media, it can be measured after cooling down through the cooling device. When measuring the steam medium, the pressure transmitter can also be filled with water or other liquids to prevent the pressure transmitter from coming into direct contact with the steam. 2. Problems related to the measurement method (1) Liquid measurement: When measuring the liquid flow, the pressure tap should be opened on the side of the process pipeline to avoid the sedimentation of dregs. At the same time, the pressure transmitter should be installed next to or below the pressure taking port, so that the air bubbles can be discharged into the process pipeline. (2) Gas measurement: When measuring gas flow, the pressure-taking port should be opened at the top or side of the process pipeline. And the pressure transmitter should be installed beside or above the process pipeline, so that the accumulated liquid can easily flow into the process pipeline. (3) Steam measurement: When measuring the steam flow, the pressure taking port should be opened on the side of the process pipeline, and the pressure transmitter should be installed under the pressure taking port, so that the cold liquid can be filled in the pressure guiding pipe. It should be noted that when measuring steam or other high temperature media, its temperature should not exceed the limit temperature of the pressure transmitter. When the measured medium is steam, the pressure guiding pipe should be filled with water to prevent the steam from directly contacting the pressure transmitter. In this way, when the pressure transmitter is working, its volume change is negligible, and no condensing tank needs to be installed. (4) Liquid level measurement: The differential pressure transmitter used to measure the liquid level is actually the static pressure head of the liquid column. This pressure is determined by the liquid level and the specific gravity of the liquid, and its magnitude is equal to the height of the liquid surface above the pressure tap multiplied by the specific gravity of the liquid, regardless of the volume or shape of the container. a. Liquid level measurement of open containers When measuring the liquid level of open containers, the pressure transmitter is installed near the bottom of the container to measure the pressure corresponding to the liquid level above it. The pressure of the liquid level of the container acts on the high pressure side of the pressure transmitter, while the low pressure side is open to the atmosphere. If the lowest liquid level of the measured liquid level variation range is above the installation of the pressure transmitter, the pressure transmitter must be moved positively. b. Liquid level measurement in airtight containers In airtight containers, the pressure P0 of the container above the liquid affects the measured pressure at the bottom of the container. Therefore, the pressure at the bottom of the container is equal to the liquid level multiplied by the specific gravity of the liquid plus the pressure P0 of the closed container. In order to measure the true liquid level, the pressure P0 of the container should be subtracted from the measured pressure at the bottom of the container. To do this, open a pressure port at the top of the container and connect it to the low pressure side of the pressure transmitter. In this way, the pressure in the container acts on the high and low pressure sides of the pressure transmitter at the same time. The resulting differential pressure is proportional to the product of the liquid level and the specific gravity of the liquid. c. Pressure-guiding connection method (1) Dry pressure-guiding connection If the gas above the liquid does not condense, the connecting pipe on the low pressure side of the pressure transmitter will remain dry. This situation is referred to as a dry pilot connection. The method for determining the measurement range of a pressure transmitter is the same as for the level of an open container. (2) Wet pressure guiding connection If the gas above the liquid condenses, the pressure guiding pipe on the low pressure side of the pressure transmitter will gradually accumulate liquid, which will cause measurement errors. In order to eliminate this error, the low pressure side pressure pipe of the pressure transmitter is filled with a certain liquid in advance, which is called wet pressure connection. In the above situation, there is a pressure head on the low pressure side of the pressure transmitter, so negative migration must be performed. If you have a similar situation, please feel free to contact Xiaobian at any time. For more flow meter knowledge, please log in to the official website of Kaidi Flow Meter at any time for detailed inquiry.
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