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technical article
Installation precautions for pressure differential tube of differential pressure transmitter
2011-5-24 16:49:55

When the differential pressure transmitter and throttling device are used together, when the field pressure is low, a situation often occurs when calculating, that is, the upper limit of the calculated differential pressure is micro differential pressure. Differential pressure transmitters place high demands. Here's how to properly install the problem:

1. Due to its small measuring range and different installation positions, the differential pressure transmitter causes pressure changes due to uneven force. (At a slope of 30 degrees, a pressure of 0.2KPa will be generated). In this case, especially when used with Annubar flowmeters, we must pay attention to the installation of the differential pressure transmitter .
2. Prevent the transmitter from coming into contact with corrosive or overheated measured medium;
3. Prevent dregs from depositing in the impulse tube;
4. The pressure guiding tube should be as short as possible;
5. The liquid column heads in the pressure guiding tubes on both sides should be balanced;
6. The pressure guiding pipe should be installed in a place with small temperature gradient and temperature fluctuation, and no shock and vibration.

Ways to minimize errors on site:

a. The impulse tube should be as short as possible;
b. When measuring liquid vapor, the impulse pipe should be connected upward to the process technology pipe, and its slope should not be less than 1/12;
c. For gas measurement , the impulse pipe should be connected down to the process pipeline , and its slope should not be less than 1/12;
d. Avoid high points when laying liquid pressure piping, and avoid low points when laying gas pressure piping;
e. The two pressure pipes should be kept at the same temperature;
f. To avoid the influence of friction, the caliber of the pressure guiding tube should be large enough;
g. There should be no gas in the liquid-filled pressure guiding tube;
h. When using isolation fluid, the level of the impulse tubes on both sides must be the same

Jiangsu Dongxiang Instrument Co., Ltd. recommends that the correct installation of the differential pressure transmitter in the field is an important link, and I hope it can provide a reference for the field maintenance staff.