Four wire pressure sensor signal positive and negative how to connect?
It is composed of four bridge arm resistance sensor circuit, it can output differential voltage signal and usually very weak, to be amplified by the amplifying circuit into a voltage signal is larger, or with a special circuit (signal conditioning) into 4~20mA current output.It is impossible to output 4~20mA directly, nor is the resistance.XTR105, XTR110, XTR112, XTR114 and other models are commonly used signal conditioners, you can achieve two-wire 4~20mA output.
The negative signal acts as the common end of the 4--20mA signal, that is, the reference zero potential.
A voltage signal is produced between the positive signal and the negative signal, and a current signal of 4 to 20mA can be obtained by proper resistance.
