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4-20mA Formulas and Examples

S Bharadwaj Reddy
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:    Calling I the

PLC Analog Input Conversion Formula

S Bharadwaj Reddy
For any unit conversion on any PLC you can use four function math with the following, which assumes integer math: Formulas: EU = ((EUSpan x (DATA – DataOffset))/DataSpan) + EUOffset

Scaling Sensor Output to Engineering Units

S Bharadwaj Reddy
Scaling – Converting Current and Voltage Inputs To Engineering Units Such As psi, Deg C, m3/hr etc… It is very often necessary to convert a voltage, millivot or current reading

How to do 4-20mA Conversions Easily

S Bharadwaj Reddy
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

Linear to Square Root Extraction

S Bharadwaj Reddy
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’s

S Bharadwaj Reddy
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 ), is normally defined as

Relationship between Temperature Scales

S Bharadwaj Reddy
Relationship between Temperature Scales Relationship between Fahrenheit and Celsius To determine the relationship between Fahrenheit and Celsius, we could draw a graph of F (temperature in °F) versus C (temperature

Formula to Calculate 3-15psi from 4-20mA Current

S Bharadwaj Reddy
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

Formulas to calculate ma from PV, LRV and URV

S Bharadwaj Reddy
The formula for calculating equivalent current (ma) from known process variable (PV), Lower range value (LRV) and Upper range value (URV). Formulas to calculate ma from PV The formula is:

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