Installation and use of differential pressure transmitter

1. Principle of differential pressure transmitter: The differential pressure transmitter is used to prevent the medium in the pipeline from directly entering the transmitter, and the pressure-sensitive diaphragm and the transmitter are connected by a capillary filled with fluid. It is used to measure the liquid level, flow and pressure of liquid, gas or steam, and then convert it into 4-20mA signal output. 2. Installation and use of differential pressure transmitter: The length of the pressure guiding pipe between the differential pressure transmitter and the differential pressure source should be as short as possible, generally within the range of 3~50m, and its inner diameter should not be less than 8mm; It should maintain an inclination of not less than 1:10, that is, when laying 10m in the horizontal direction, the height difference between the two ends is 1m. The slope of the pressure guiding pipe should meet the following requirements: when the measured medium is gas, the cold gel in the gas should automatically flow back to the process pipeline or the middle area of ​​the equipment along the pressure guiding pipe, so the installation position of the transmitter is preferably high. For the pressure source, if this cannot be done in actual installation, a liquid collector and a drain valve should be installed at the lowest point of the pressure guiding pipeline. When the measured medium is liquid, the gas precipitated in the liquid should be able to flow back to the process pipeline or equipment along the pressure guide pipe, otherwise a gas collector and a vent valve should be installed at the highest point of the pressure guide pipe , so the transmitter should be installed below the pressure source. In short, the slope and slope of the pressure guiding pipeline should ensure that only single-phase medium (gas phase and liquid phase) exists in the pressure guiding pipeline and differential pressure transmitter to ensure the stability of the measurement and prevent additional errors. When the measured medium is steam, a condensing container should be installed in the pressure guiding pipeline to prevent the differential pressure transmitter from being damaged due to the entry of high temperature steam. The installation position of the condenser should ensure that the condensate level in the two pressure guiding pipes is kept at the same level for a long time. The pressure guiding pipeline from the condensing container to the transmitter should be laid according to the requirements when the measured medium is liquid. For corrosive media, corresponding isolation equipment should be installed in the pressure guiding pipeline to prevent the differential pressure transmitter from being corroded. When the measured medium has high viscosity, easy precipitation or crystallization, low gas phase/liquid phase transition temperature, easy polymerization, etc., corresponding isolation equipment should also be adopted to prevent the pressure guiding pipe from being blocked. 3. Precautions for the use of the differential pressure transmitter: 1. The differential pressure transmitter must be recalibrated before its use, including its measurement range, zero drift, accuracy, and static pressure error. 2. After the transmitter is installed, it is necessary to check the working pressure, working temperature, measurement range, drift, etc. of various transmitters before driving. Check whether it is consistent with the actual situation. If there is any discrepancy, you must find out the cause and correct it before driving. 3. When turning on and off, the meter should be prevented from being subjected to one-way static pressure. In order to avoid one-way pressure during use, each differential pressure transmitter should be equipped with a set of three-valve components, which are usually installed above the differential pressure transmitter, where valve 1 and valve 3 are high-pressure and low-pressure shut-off valves respectively. , valve 2 is a balance valve. Balance valve 2 is used to protect the differential pressure transmitter and facilitate zero adjustment when the meter is turned on and off. When opening the differential pressure transmitter, the balance valve 2 should be opened first, then the valve 1 and valve 3 should be opened, and the valve 2 should be closed after the valve 1 and valve 3 are fully opened. When deactivating the differential pressure transmitter, the balance valve 2 should also be opened first, and then valve 1 and valve 3 should be closed respectively. Turning on or deactivating the differential pressure transmitter in the above sequence can avoid the differential pressure transmitter being subjected to single Overload to static pressure; for differential pressure transmitters with cold gel or spacer fluid, it can also avoid cold gel or spacer fluid being washed away.

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