Function and principle of pressure transmitter
The pressure transmitter transmits the pressure signal to the electronic device, which then displays the pressure on the computer.
The principle is roughly as follows:
Transforming the mechanical signal of water pressure into an electronic signal of current (4-20mA)
The relationship between pressure and voltage or current is linear, usually proportional
So, the voltage or current output by the transmitter increases as the pressure increases
From this, we can derive a relationship between pressure and voltage or current
The two pressures of the tested medium of the pressure transmitter are introduced into the high and low pressure chambers, and the low pressure chamber pressure is either atmospheric pressure or vacuum, acting on the δ On both sides of the isolation diaphragm of the element (i.e. sensitive element), the filling liquid inside the element is transmitted to both sides of the measurement diaphragm through the isolation diaphragm. A pressure transmitter is a capacitor composed of a measuring diaphragm and electrodes on both sides of the insulation sheet. When the pressure on both sides is inconsistent, it causes displacement of the measuring diaphragm. The displacement is proportional to the pressure difference, so the capacitance on both sides is unequal. Through oscillation and demodulation, it is converted into a signal proportional to the pressure.
