Working principle and installation method of pressure transmitter

A pressure transmitter is a device that converts the pressure of a gas or liquid into usable electrical signals. The pressure transmitter can be divided into two wire, three wire, and four wire systems according to the wiring method. The building owner should see a four wire systemPressure transmitter. Two power cables and two signal cables. The power supply is connected to 24V DC, and a simple detection method is to use an ammeter or voltmeter to connect the signal wire at both ends. After the power is connected, the ammeter will have a current of 4mA or the voltmeter will have a voltage of 0V or 1V.
Nowadays, transmitters generally have four wiring terminals, two of which are wired, and the other two are not wired. The DC24V power line of the transmitter is also a 4-20mA signal feedback line, which means that your secondary meter or DAS (data acquisition system) AI point should have a DC24V output.

Pressure transmitterThe general output signal is a current of 4-20MA, 0-20MA, or a voltage of 0-5V, 1-5V, 0-10, etc. The current type is usually a two wire or four wire system, and the voltage output is a three wire system. At present, many frequency converters in the city do not have a 24VDC power supply, most of which are 10V. Some transmitters with high power consumption cannot be powered by a 10VDC power supply, so only an external 24VDC power supply can be used. In this way, the frequency converter has four wiring terminals: power supply+, power supply -, feedback+, and feedback -. Current type four wire wiring method: power supply+==power supply+; Power supply -==Power supply -; Signal+==feedback+, signal -==feedback -. Current type two wire system connection method: power supply+==power supply+; Signal+==feedback+, power supply -==feedback -. Voltage type three wire wiring method: power supply+==power supply+; Power supply - (signal -)==Power supply -; Signal+==Feedback+, Power - (Signal -)==Feedback -.

The pressure transmitter can be directly connected to the frequency converter, and the power supply can be 24V on the frequency converter. The pressure transmitter can be connected in series to the signal circuit.
Check if the pressure transmitter is current type or voltage type! Clearly see that the voltage output terminal of the output voltage pressure transmitter is connected to the external adjustable voltage input terminal of the frequency converter. The hardware connection between the pressure transmitter and the external adjustable ground of the frequency converter has been completed. You need to install the software for forward and reverse rotation, frequency and speed, and driving mode.