Two flange type liquid level transmitters of the same model with different display values in the same environment? / two flange type liquid level transmitters on the main steam pipe of a certain plant measure the saturated steam pressure (steam pressure is 0.8MPa, temperature is 175 ℃), the distance between the two pressure tapping points on the main steam pipe is 20m, and the direct connection flange type liquid level transmitter (yr-er102-bfa2nn1nnc) of moistening monocrystalline silicon is selected 0-1.6mpa), one of which is used for temperature and pressure compensation of the power plant, the signal enters the steam flow totalizer of the power plant, the other is used for pressure monitoring of the steam pipe network by the branch plant, and the signal enters the DCS of the branch plant. Analysis of the possible causes of the display deviation of the flange type liquid level transmitter
1. Flange type liquid level transmitter is faulty or out of tolerance.
2. Installation problem or blockage and leakage of impulse pipe.
3. The line is open or wrongly connected.
4. The middle card is faulty (the distributor or safety barrier is broken or the card of DCS system is faulty).
Safety measures before treatment for two flange type liquid level transmitters with the same environmental display value inconsistent
Before maintenance, work permit shall be handled, and operators shall wear labor protection articles, anti scalding clothes and anti scalding gloves.
Two flange liquid level transmitters of the same model have different display values in the same environment
1. The single crystal silicon direct connected flange type liquid level transmitter used in the power plant has been verified by the Technical Supervision Bureau, and the instrument accuracy meets the requirements, so the pressure transformer of the branch plant is mainly inspected;
2. The branch pressure transformer was removed, and there was no problem in the field calibration. The field inspection found that the customers of Huaheng instrument installed the flange type liquid level transmitter under the pipe gallery (the height of the pipe gallery is 6m), and the installation elevation of the flange type liquid level transmitter was 1.2m. The flange type liquid level transmitter of the power plant was installed in short installation, that is, the flange type liquid level transmitter was installed after the primary valve of the flange type liquid level transmitter was directly added with a condensation ring 。
Root cause of inconsistency between two flange type liquid level transmitters in the same environment
The problem fed back by users of Huaheng instrument is that the installation mode and position of two direct connected flange type liquid level transmitters are not in the same horizontal plane, resulting in high-level difference: there is a 5-meter high-level difference between the instruments of the branch plant and the pressure tapping point, resulting in a static pressure difference of 0.05Mpa.
As a manufacturer of industrial automatic instruments based in Northwest China, our company has three major technical strength at present, one is the technology of fully isolated intelligent circuit processing unit, the other is the manufacturing technology of metal capacitance sensor, and the third is the multi parameter technology of the whole series of throttling devices.
Based on the technical advantages of the original Xiyi, Huaheng instrument company has developed and improved the core technology of inductive sensor and circuit board, with more than 30 years of experience in the production and development of instrument transmitter manufacturers. As a pioneer of HART protocol technology and smart transmitter manufacturers in China, we are mainly engaged in single flange liquid level meter, double flange liquid level meter, magnetostrictive liquid level meter, sanitary flange liquid level transmitter, high-precision flange liquid level transmitter, hart475 manual operator, hydrostatic liquid level meter, The investment type liquid level meter is a booster that transforms the scientific and technological enterprise from the extension type expansion to the connotation type expansion,