Introduction to Transmitter Calibration Calculator A transmitter in an industrial plant is only as useful as the scaling behind it. In a 4 to 20 mA loop, the current signal must correctly represent the process variable so the control system, operator display, alarms, and interlocks all behave as intended. That is why transmitter calibration remains … Continue reading Transmitter Calibration Calculator: How to Calculate Span, LRV, URV, and 4 to 20 mA Signal Percentage