When used in conjunction with a throttling device, when the field pressure is low, it is often the case when calculating that the upper limit of the calculated differential pressure is micro differential pressure. The requirements are very high. Here's how to properly install the problem:
由于其量程小，安装位置不同而受力不均匀引起压力的变化。 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 tube should be installed in a place with little temperature gradient and temperature fluctuation, and no shock and vibration. zzyfwh.com .
现场尽量减少误差的方法： Method of minimizing the error of the differential pressure transmitter 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
是用于测量微笑压力的变送器，然后转变成4～20mA DC信号输出。 The micro differential pressure transmitter is a transmitter for measuring the smile pressure, which is then converted into a 4-20 mA DC signal output. There are not many applications for micro differential pressure transmitters, but it still has certain applications. The following briefly describes the specifications of the differential pressure transmitter.
Factors affecting its measurement accuracy:
Stability Ambient Temperature Affects Static Pressure Affects Vibration Affects Power Affects Load Affects EMI / RFI Installation Location Impact
Measuring range zero and range: digital, intelligent; analog linear zero positive and negative migration output: digital, intelligent damping time constant, ambient temperature limit, process temperature limit: filled with silicone oil, filled with inert liquid, storage temperature limit, ambient humidity, static pressure and overpressure limit Change