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Instrumentation control engineering formulas used in industrial control systems and field instruments like 4-20mA and 3-15 PSI conversions.

## Instrument Percent of Span Error

An important part of performing instrument calibration is determining the extent of an instrument’s error. Error is usually measured in percent of span. Instrument Percent of Span Error Calculate the...

## PLC Raw Count Calculation for Pressure Transmitter

Every instrument has at least one input and at least one output. For instruments responding linearly, the correspondence between input and output is proportional: PLC Raw Count Calculation A practical...

## 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...

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...

An Allen-Bradley SLC500 programmable logic controller (PLC) uses a 16-bit analog-to-digital converter ( in its model 1746-NI4 ) in analog input card to convert 4-20 mA signals into digital number...

## Raw Counts to Engineering Units : Conversion Formula

We need to convert sensor raw counts to engineering units in a PLC system. Convert Raw Counts to Engineering Units We have a sensor which gives a raw value input...

## Turbine Flow meter Coefficient and Scaling Factor

A digital turbine flowmeter generates 10 pulses per gallon of liquid passing through it. Determine the meter coefficient and calculate the scaling factor that are needed to develop an output...

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