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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...

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...

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. 4-20mA Graphical Calculations For example, the common...

Why 4-20 mA Standard is so popular ?

S Bharadwaj Reddy
4-20 mA Standard 4-20mA has an inherent ‘live zero’. Zero engineering units is 4.0mA, not 0.0mA. 0.0mA indicates an open circuit, a failure or a fault mode like cut wires...

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...

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: 4 to 20 mA Conversion Being a linear function,...

Formula for Current 4-20ma to Percentage Conversion

S Bharadwaj Reddy
Calculate the equivalent Percentage for any given current signal 4 to 20 mA. For conversion, we need transmitter Lower Range Value and Upper Range Value. Current 4-20ma to Percentage Conversion  Formula:...

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