The indication of a double flange differential pressure transmitter sometimes cannot reflect the actual parameters of the measured medium, as the measurement system itself may generate errors. The system installation requirements include: the opening position of the pressure tap, the reasonable laying of the connecting conduit, and the installation position of the transmitter.

Firstly, the pressure tapping port should be located in an area where the fluid flow is stable and there are no eddies. In terms of process, it should be able to ensure the measurement of the selected process parameters. For example, when using a differential pressure transmitter to measure the water level of a boiler steam drum, the actual water level distribution of the steam drum in the axial and radial directions is different, generally in the axial direction, with a higher water level in the middle and lower water levels on both sides; Along the radial direction, the denser side of the downcomer is higher. The liquid level transmitter of a steam turbine condenser in a certain power plant caused the water surface to sink at the measuring point due to the proximity of the measuring point to the inlet of the condensate pump. As a result, the transmitter's reading was significantly lower. Later, the measuring cylinder was moved further away from the inlet of the condensate pump, and the condenser water level transmitter matched the actual water level indication on site*Ensure the safe and stable operation of the condenser.

Secondly, when measuring the liquid level, the differential pressure value measured by the differential pressure level transmitter is relatively small, usually within a fewKPato100 kPaTherefore, the entire measurement system has a significant impact on measurement accuracy. As shown in the figure1As shown, when installing the pressure pipe, the horizontal section of the pressure pipe should have a certain slope, and the slope should be as large as possible to avoid the accumulation of liquid inside the pressure pipe, which may cause inaccurate measurement. In the case of a small transmitter range, it may cause fluctuations in the transmitter output. In addition, when the transmitter is put into operation, the bubbles in the liquid column of the pressure pipe should be emptied as much as possible, as these accumulated gases will affect the accuracy of the measurement. It is also possible to consider installing an exhaust device at the upper turning point of the pressure pipe.

Characteristics of double flange differential pressure transmitter:

●Super measurement performance, used for pressure, differential pressure, liquid level, and flow measurement

●Numerical accuracy:±0.25%

●Simulation accuracy:±0.5%±0.1%F.S

●Full performance:±0.25F. S

●Stability:0.25% 60month

●Range ratio:100：1

●Measurement rate:0.2S

●Miniaturization（2.4kg）All stainless steel flange, easy to install

●Process connectivity is compatible with other products to achieve optimal measurement

●Worldwide adoptionHThe sensor (technology) with alloy sheath has achieved excellent cold and hot stability

●adopt16Intelligent transmitter for computers

●standard4-20mA, based onHARTDigital signal of protocol, remote control

●Support the upgrade to fieldbus and field control based technologies.

The double flange differential pressure transmitter provides a reliable measurement method to avoid direct contact between the measured medium and the isolation diaphragm of the transmitter.

The double flange differential pressure transmitter is suitable for the following working conditions:

1It is necessary to isolate the high-temperature medium from the transmitter.

2The measuring medium has a corrosive effect on the sensitive components of the transmitter.

3The tested medium solidifies or crystallizes due to environmental or temperature changes.

4Double flange differential pressure transmitter requires strict purification of the measuring head when replacing the measured medium

5Suspended liquids or high viscosity media

6The measuring head must be kept clean and hygienic.

7Measurement of sealed pressure vessels.