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 responding instrument relating input directly to output, a more general...
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4-20mA Formulas and Examples
4-20 mA transmitter current output can be converted to the voltage within a specified range, from 0 to a maximal amplitude Vmax, as shown in the following picture: 4-20mA Formulas Calling I...
PLC Analog Input Conversion Formula
For any unit conversion on any PLC, you can use four function math with the following for PLC Analog Input Conversion Formula, which assumes integer math, as follows : PLC...
Scaling Sensor Output to Engineering Units
Sensor Scaling – Converting Current and Voltage Inputs To Engineering Units Such As psi, Deg C, m3/hr etc… Sensor Scaling It is very often necessary to convert a voltage, millivot...
Linear to Square Root Extraction
Some pressure measurements are used to indirectly derive another type of measurand. One of these is the Rate of Flow of a gas or liquid. The flow rate along a...
Calculate Temperature Coefficient of RTD
RTD’s are based on the principle that the resistance of a metal increases with temperature. The temperature coefficient of resistance (TCR) for resistance temperature detectors (denoted by αo), is normally defined as the...
Formula to Calculate 3-15psi from 4-20mA Current
The amount of psi can also be calculated from the amount of the milliamp signal, or one can calculate the amount of the milliamp signal when the amount of psi is known. Each of...
Calculate Flow Coefficient Kv of Solenoid Valve
Flow Coefficient Kv Definition Kv-value: Amount of flow (m3/hour) of water of 20°C in a valve with a pressure loss of 1 bar. The amount of flow of a fluid...
Calculate Process Variable from 4-20mA using Fraction of Measurement
An electronic transmitter with an output of 4 – 20 mA is calibrated for a pressure range of 7 – 10 MPa(g). What pressure is represented by a 12 mA...
Calculate Process Variable from Transmitter Current
A pH transmitter has a calibrated range of 4 pH to 10 pH, with a 4-20 mA output signal. Calculate the pH sensed by the transmitter if its output signal...