The top-mounted differential pressure density meter is used in chemical separation tanks. The storage tanks are generally steel storage tanks. According to the characteristics of the storage medium, storage temperature, pressure and other parameters, carbon steel, low temperature steel, stainless steel and other materials are selected. Other materials such as FRP, Plastics, etc., are not considered due to factors such as fire resistance and compression resistance.
chemical separation tank measurement problems
Top Mounted Differential Pressure Transmitter Differential Pressure Density Meter Chemical Separation
The influence of the top-mounted differential pressure transmitter measurement mainly includes those problems:
The measurement of the chemical separation tank is different from other fluids such as water, air and other media. There are many factors affecting the measurement in the actual measurement. It often occurs that the measurement of the differential pressure transmitter itself is qualified, but the actual measurement feels “inaccurate”. Phenomenon.
The factors that affect the accurate measurement of the top-mounted differential pressure density meter
(1) The density compensation of the chemical separation tank is incorrect. In order to correctly measure the mass density measurement of the chemical separation tank, the pressure and temperature changes of the chemical separation tank must be considered, that is, the chemical separation tank density compensation. Different types of differential pressure transmitters measure differently by density changes. The signal output measured by the vortex differential pressure transmitter is only related to the flow rate, and has nothing to do with the density, pressure and temperature of the medium. type, the square root of differential pressure and the square root of density are related.
① Compensate for differences in degrees. The temperature measurement has a great influence on the compensation degree. If the temperature and pressure sensors of the same accuracy level are used, the density difference caused by the temperature measurement error is greater than the pressure measurement error.
②Influencing factors of pressure measurement. In the measurement of the pressure of the chemical separation tank, due to the gravity of the condensed water in the pressure pipe, there will be a certain difference between the pressure measured by the pressure transmitter and the pressure of the chemical separation tank. If the pressure measurement error is not corrected, it will affect the calculation of the density of the chemical separation tank and cause the error of the top-mounted differential pressure transmitter. For the above phenomenon, the zero point migration can be performed in the secondary meter (in the differential pressure transmitter measuring computer), which is simple and accurate.
③ Factors affecting temperature measurement. Judging from the situation of the differential pressure transmitter measuring on-site use, the temperature measurement error is related to the non-standard installation in addition to the inherent error of the temperature measuring element. Top Mounted Differential Pressure Transmitter Differential Pressure Density Meter Chemical Separation
top-mounted differential pressure density meter advantages
1. The measured medium is wide, and it can measure water, oil, paste compatible with the material of the density measuring instrument of the differential pressure transmitter, etc.
2. Corrosion resistance, with high precision and high stability.
3. Small size, light weight, easy installation, use and maintenance.
4. Anti-interference, can directly sense the pressure of the measured medium, and is not affected by impurities such as medium foaming and deposition.
