When the distance between the field and the control room is far, using a constant current source signal can avoid errors caused by wire impedance. The 20mA current selection ensures safety while taking into account cost and power consumption.
Formulation of signal standards
When the distance between the field and the control room is far, using a constant current source signal can avoid errors caused by wire impedance.
Selection of maximum current
The 20mA current selection ensures safety while taking into account cost and power consumption.
