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: Calling I the
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PLC Analog Input Conversion Formula
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
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
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
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
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
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
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
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: