How does a differential pressure transmitter measure liquid level?

　　Differential pressure transmitter is a very common type of thermal measuring instrument in the field of industrial production. It is mainly used to measure the pressure of liquid media, such as liquid level gauge, level gauge, level transmitter, and liquid level. Transmitter, capacitive level meter, capacitive level meter, capacitive level transmitter, capacitive level transmitter, level switch, level switch, capacitance level meter, capacitance level meter, Liquid level instrument, level instrument, capacitive level transmitter, capacitive level transmitter, RF capacitive level switch, RF capacitive level switch, capacitive level switch, capacitive level switch, tuning fork type Physical parameters such as level switch and flow rate.

　　At present, in industrial automation production equipment, the application range of differential pressure transmitters is becoming more and more extensive. However, as a general measuring instrument, operational failures often occur. If problems are encountered in production, we need to be able to solve them in time. , if it cannot be dealt with quickly, it will definitely affect the normal production to a certain extent, and some serious faults may even endanger personal safety. This article is a brief discussion of the application of differential pressure transmitters in liquid level measurement based on the long-term experience accumulated by Runzhong Instrument Technology Co., Ltd.

　　Differential pressure transmitters are usually used to measure the liquid level in closed containers, using the pressure difference generated by the liquid's own gravity to measure the liquid level of the liquid in the container. The high-pressure side measuring tube is always filled with water due to steam condensation, keeping the pressure constant, while the low-pressure side measuring tube and the container form a connector, and the pressure changes linearly with changes in the liquid level in the container.

　　When a differential pressure transmitter measures liquid level, the setting of the zero position is a very important step. When the high-pressure (H) side and low-pressure (L) side of the transmitter are connected to the high-pressure side and low-pressure side of the local measuring cylinder, the high-pressure side pressure pipe is always filled with water, and the pressure is measured at the high-pressure end of the transmitter. is P+kPa, the low-pressure side of the transmitter is connected to the low-pressure side pressure pipe, and the measured pressure is P-kPa, then the actual differential pressure measured by the transmitter is (P+-P-) kPa.

　　The EJA118 diaphragm sealed differential pressure transmitter is used to prevent the process medium from directly entering the pressure sensor assembly of the differential pressure transmitter. They are connected to the transmitter through a capillary tube filled with fluid. EJX118W, EJA118N and EJA118Y diaphragm sealed differential pressure transmitters are used to measure the flow rate of liquid, gas or steam as well as liquid level, density and pressure, and then convert it into a 4~20mA DC current signal output. The EJA series supports BRAIN, HART and FOUNDATION fieldbus or PROFIBUS PA communication protocols.