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4-20mA Graphical Calculations

S Bharadwaj Reddy
An illustration sometimes find helpful in understanding analog signal ranges is to consider the signal range as a length expressed on a number line. For example, the common 4-20 mA analog current

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

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 that

Calculate Process Variable from Transmitter Current

S Bharadwaj Reddy
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

Calculate Temperature Transmitter Output

S Bharadwaj Reddy
An electronic  temperature transmitter is ranged  50 to 140 degrees  Fahrenheit and  has  a 4-20 mA output  signal.   Calculate  the  current output  by this  transmitter if the  measured  temperature is

Standard 4 to 20 mA Conversion Formula

S Bharadwaj Reddy
A 4 to 20 mA current signal represents a 0 to 100 percent scale. Usually, this scale is linear, as such: Being a linear function,  we may use the standard

Formula for Current 4-20ma to Percentage Conversion

S Bharadwaj Reddy
Calculating the equivalent Percentage for any given current signal 4-20ma. Formula for Current 4-20ma to Percentage Conversion  Formula:   Percentage, %  =   ((X-4)/16)(100) Where X is current signal in

Formula for Percentage to Process Variable Conversion

S Bharadwaj Reddy
Calculating the equivalent Process Variable for any given percentage of signal. Formula for Percentage to Process Variable Conversion   Formula:   Process Variable = Span(X/100) +LRV Span = (URV) –

Formula to Calculate 4-20ma from percentage

S Bharadwaj Reddy
Calculating the equivalent milliamp value for any given percentage of signal. Formula for calculating the current 4-20ma from equivalent percentage. Formula: Current (mA) = [(16 ma)(X/100)]+4   Where “X” is

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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