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Instrumentation Formulas

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...

Example of 3-15 psi to 4-20mA Conversion

S Bharadwaj Reddy
A current-to-pressure transducer is  used  to  convert  a  4-20 mA  electronic  signal  into  a  3-15 PSI pneumatic signal. This particular transducer is configured  for  reverse action instead  of direct, meaning...

PLC Raw Count Calculation for Pressure Transmitter

S Bharadwaj Reddy
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

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: 4-20mA Formulas  Calling I...

PLC Analog Input Conversion Formula

S Bharadwaj Reddy
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...

PLC Problems Troubleshooting

S Bharadwaj Reddy
Troubleshooting PLCs can be started by checking the healthiness status of CPU, I/O Modules, Fuse Blow-out and different PLC Failure reasons including wiring, field transmitters healthiness status or transmitter configuration,...

PLC Analog Input Scaling

S Bharadwaj Reddy
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...

DP Transmitter Dry Leg & Wet Leg Calculations

S Bharadwaj Reddy
In any process industry, level measurement is very important for safety and process purpose. The level can be measured by two methods. Direct method Indirect method Here we discuss the...

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