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:
Where,
I is the current,
V is the voltage,
PV is the Process Variable
min is the Lower Range Value of the respective signal
max is the Upper Range Value of the respective signal
Note that the values and units of min and max are units must be same.
Example 1 :
I = ( ( (V − Vmin) / ( Vmax − Vmin) ) × 16 ) + 4
I = ( ( (2.5 − 0) / ( 5 − 0) ) × 16 ) + 4
I = 12 mA
Example 2 :
V = ( (I − 4 ) / 16) × ( Vmax − Vmin ) + Vmin
V = ((13.5 – 4)/16 x (10 – 0 ) + 0
V = 5.9375 V
Example 3 :
PV = ( (I − 4 ) / 16) × ( PVmax − PVmin ) + PVmin
PV = ( (16.5 − 4 ) / 16) × ( 1500 − 0 ) + 0
PV = 1171.87 m3/hr
Also Read : 4-20mA Transmitter Principle
In this example, we will learn batch mixing with PLC ladder logic program using timer…
This PLC example on manufacturing line assembly is an intermediate-level PLC program prepared for the…
In this article, you will learn the PLC programming example with pushbutton and motor control…
This article teaches how to convert Boolean logic to PLC programming ladder logic with the…
In this article, you will learn the PLC programming example on timers function block using…
Design a program for PLC pump control such that the pump must be turned ON…
View Comments
Thanx, Realy it is important for me.
Thanks very much sir, this is very important.
pls how do i print it.
formula wrong ex: range -50 to 50 psi i get 12 mA what is the pv value?
Hi Balajee, Formula Working fine. Please see : PV = [ (12-4)/16 X { 50- (-50) } ] + (-50) = ( 0.5 X 100 ) - 50 = 0. Also Click Here to Use online Calculator for fast calculations.
yes Mr S Bharadwaj reddy its by mistake. Thanks 4 reply
I(mA)=16/(Vmax-Vmin)(V-Vmin)+4Vmax/(Vmax-Vmin)
0 psi
How amazing very good effort.
thanks
thank you brother
how to calculate the % of valve opening at milli ampere 4 to 20
Hi, For 4-20mA to 0 - 100 % Conversion : CLICK HERE
Thank you infomation.
how to calculate 4 to 20 mA for -17 to 187 Mwatts
4-20 mA for 0-1000kg sensor transducer, what is output for 850kg?