Wiring method for pressure sensor transmitter

2The wiring of sensors has always been one of the most frequently consulted questions during the customer procurement process. Many customers do not know how to wire sensors. In fact, the wiring methods of various sensors are basically the same. Pressure sensors generally have two-wire, three wire, four wire systems, and some even have five wire systems.
The two-wire system for pressure sensors is relatively simple, and most customers know how to wire it. One wire is connected to the positive pole of the power supply, and the other wire, which is the signal wire, is connected to the negative pole of the power supply through the instrument. This is the simplest. The three wire system for pressure sensors adds a wire on top of the two-wire system, which is directly connected to the negative pole of the power supply, which is a bit more complicated than the two-wire system. The four wire pressure sensor definitely has two power input terminals, and the other two are signal output terminals. Four wire systems are mostly voltage outputs rather than 4-20mA outputs. 4-20mA transmitters are called pressure transmitters, and most are made into two-wire systems. The signal output of some pressure sensors is not amplified, with a full-scale output of only a few tens of millivolts, while some pressure sensors have internal amplification circuits with a full-scale output of 0-2V. As for how to connect to the display instrument, it depends on the range of the instrument. If there is a gear that is compatible with the output signal, it can be directly measured. Otherwise, a signal adjustment circuit needs to be added. The difference between five wire pressure sensors and four wire sensors is not significant, and there are relatively few five wire sensors on the market.