Answer / bongani

the linear variable differential transmitter or transformer has a potentiometer(varrying resistance) when it stretched the resistance changes. With the 24vdc supply, the ohms law is completed to give a linear 4-20mA output to your controller or indicator. same storry applies on the RVDT

If we increase PI controller what will be action.

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Dear all... I have 1 0-400 duplex type RTD, I connected the A side to the temperature indicator and B side to the PLC panel, but when I have observed then found that The PLC side temp has the variation. and it was distub to other RTD temp also. so what can I do.

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what is zero and span ?

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