420mA scaling calculator
Current loop tester panel mounting
€29.95
Excl. VAT

420 mA signals are used to transfer a physical value such as a temperature, pressure or other physical quantity. The current in the loop represents the corresponding physical value.
Example:
A 420mA temperature transmitter with a range of 0 tot 100 degrees Celsius measures a temperature of 20 degrees. Then a current of 7,2 mA will flow in the loop.
The current corresponding to a measured value can be calculated with the 420mA scaling calculator below:
mA

↔ 
°C

mA

↔ 
°C

mA

↔ 
°C

Calculation from a current (I) corresponding to a measure physical value (Pv) is done with the following formula:
$$ I = \frac{ I_{high}  I_{low} }{ Pv _{high}  Pv _{low} } \cdot ( Pv  Pv _{low} ) + I_{low} $$ Calculation from a physical value (Pv) corresponding to a current (I) can be done with the following formula: $$ Pv = \frac{ Pv_{high}  Pv_{low} }{ I_{high}  I_{low} } \cdot ( I  I_{low} ) + Out_{low} $$
© July 11, 2013
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