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The length of the pressure guiding tube between the differential pressure transmitter and the differential pressure source should be as short as possible, generally in the range of 3~50m, and the inner diameter should not be less than 8mm; the pressure guiding tube should have a slope of not less than 1:10. That is, when 10 m is laid in the horizontal direction, the height difference between the two ends is 1 m. The slope direction of the pressure guiding tube should satisfy: when the measured medium is gas, the cold gel in the gas should be automatically flowed back to the process pipe or the middle area of ​​the equipment along the pressure guiding tube, so the transmitter installation position is preferably high. For the pressure source, if this is not possible in the actual installation, the liquid collector and the drain valve should be installed at the lowest point of the pressure guiding line. When the measured medium is a liquid, the gas evolved in the liquid should flow back to the process pipeline or equipment along the pressure guiding tube. Otherwise, the gas collector and the bleed valve should be installed at the highest point of the pressure guiding pipeline. Therefore, the transmitter installation position is preferably lower than the pressure source. In summary, the slope and aspect of the pilot line are to ensure that only the single-phase medium (gas phase and liquid phase) is present in the pilot line and differential pressure transmitter to ensure measurement stability and prevent additional errors.
When the measured medium is steam, a condensing container should be installed in the pressure guiding line to prevent the differential pressure transmitter from being damaged due to the entry of high temperature vapor. The condenser should be installed in such a way that the condensate level in the two pressure guiding tubes is kept at the same level for a long time. The pressure guiding line from the condensing vessel to the transmitter should be laid as required when the measured medium is liquid.
For corrosive media, appropriate isolation equipment should be installed in the pilot line to prevent corrosion of the differential pressure transmitter. In the case where the measured medium has a large viscosity, is easy to precipitate or crystallize, the gas/liquid phase transition temperature is low, and it is easy to polymerize, etc., corresponding isolation equipment should also be taken to prevent the pressure guiding tube from being blocked.
2. Precautions for use of differential pressure transmitters The following three points should be noted when using differential pressure transmitters:
(1) The differential pressure transmitter must be recalibrated for its measurement range, zero drift, accuracy, static pressure error, etc. before use.
(2) After the transmitter is installed, check the working pressure, working temperature, measuring range and drift of various transmitters before driving. See if it matches the actual situation. If there is any discrepancy, you must find out the cause and correct it before driving.
(3) When opening and stopping, the instrument should be protected from one-way static pressure.
In order to avoid one-way compression during use, each differential pressure transmitter should be provided with a three-valve assembly, usually mounted above the differential pressure transmitter, where valves 1 and 3 are high pressure and low pressure shut-off valves, respectively. Valve 2 is a balancing valve. The balancing valve 2 is used to protect the differential pressure transmitter and to facilitate the zero position when opening and stopping the meter. When opening the differential pressure transmitter, the balance valve 2 should be opened first, then the valve 1 and the valve 3 should be opened again. When the valve 1 and the valve 3 are fully opened, the valve 2 is closed. When the differential pressure transmitter is deactivated, the balancing valve 2 should also be opened first, and then the valve 1 and valve 3 should be closed separately. The differential pressure transmitter can be turned on or off in the above order to avoid the differential pressure transmitter. Overload to static pressure; for differential pressure transmitters with cold gel or spacer fluid, cold gel or spacer fluid can also be avoided.
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