Instrumentation Formulas Archives

How to do 4-20mA Conversions Easily

Generally it is possible to generate a “custom” linear equation in the form of y = mx + b for any linear

4-20 mA transmitter current output can be converted to the voltage within a specified range, from 0 to a maximal amplitude Vmax,

For any unit conversion on any PLC, you can use four function math with the following for PLC Analog Input

Sensor Scaling – Converting Current and Voltage Inputs To Engineering Units Such As psi, Deg C, m3/hr etc… Sensor Scaling

Some pressure measurements are used to indirectly derive another type of measurand. One of these is the Rate of Flow

RTD’s are based on the principle that the resistance of a metal increases with temperature. The temperature coefficient of resistance (TCR)

The amount of psi can also be calculated from the amount of the milliamp signal, or one can calculate the amount of the milliamp

Flow Coefficient Kv Definition Kv-value: Amount of flow (m3/hour) of water of 20°C in a valve with a pressure loss

An electronic transmitter with an output of 4 – 20 mA is calibrated for a pressure range of 7 –

A pH transmitter has a calibrated range of 4 pH to 10 pH, with a 4-20 mA output signal. Calculate