Generally speaking, the pressure transmitter is mainly composed of three parts: a pressure measuring element sensor (also called a pressure sensor), a measuring circuit and a process connection piece.It can convert the physical pressure parameters such as gas and liquid felt by the load cell sensor into standard electrical signals (such as 4~20mADC, etc.) to supply secondary instruments such as indicating alarms, recorders, regulators for measurement and indication. And process regulation.

Classification of pressure transmitter

Pressure transmitters can be divided into general pressure transmitters (0.001MPa ~ 35MPa), differential pressure transmitters (0 ~ 1.5kPa), and negative pressure transmitters according to the measurement range; if they are classified from the perspective of accuracy, because The accuracy of our national standard is 0.5%. So in recent years, it can be divided into high-precision pressure transmitters (0.1% or 0.2% or 0.075%) and general pressure transmitters (0.5%)

The role of pressure transmitter

The pressure transmitter transmits the pressure signal to the electronic device, and then displays the pressure on the computer.

The principle of pressure transmitter

The mechanical signal of the pressure of water pressure is converted into a current (4-20mA). The electronic signal pressure is linearly related to the voltage or current, and is generally proportional. Therefore, the voltage or current output by the transmitter increases with pressure The increase results in a relationship between pressure and voltage or current.

The two pressures of the measured medium of the pressure transmitter pass into the high and low pressure chambers. The pressure in the low pressure chamber adopts atmospheric pressure or vacuum, acting on the isolation diaphragms on both sides of the δ element (ie sensitive element). The filling liquid in the element is transferred to both sides of the measuring diaphragm. The pressure transmitter is composed of a measuring diaphragm and electrodes on the insulating sheets on both sides to form a capacitor. When the pressure on both sides is inconsistent, the displacement of the measuring diaphragm is caused, and the displacement is proportional to the pressure difference, so the capacitance on both sides is unequal, and it is converted into a signal proportional to the pressure through oscillation and demodulation.

Characteristics of pressure transmitter

1) A wide range of tested media can be used, which can measure oil, water and paste compatible with 316 stainless steel and 304 stainless steel, and has a certain anti-corrosion ability.

2) High accuracy, high stability, imported imported sensors, good linearity and high temperature stability.

3) Small size, light weight, easy to install, debug and use

4) Fully enclosed stainless steel shell, good waterproof.

5) The pressure sensor directly senses the pressure of the measured liquid level, and is not affected by the foaming and deposition of the medium.