LabRepCo 21641 Owner's manual - | 12
P a g e
| 12
4-20mA REMOTE MONITOR
The Touch Screen Display, provides
a 4-20 ma current sink on pins 1
(Input) and 2 (Output). The
indicating element(s) may be loop-
powered as well, as long as the net
voltage across the output exceeds
3V d.c. but is less than 90V d.c.
The transmitter may be connected
anywhere in the loop. A typical
installation would be a 15V supply
driving one indicator and the Touch
Screen Display. The AP may be
connected before or after the
indicator in circuit so you can use
indicators, whose negative loop
connection (loop return) can be at
the same potential as their power
supply ground if they are not loop-
powered.
Circuit recommendations.
Resolution:-
0.06mA
Accuracy:-
+/- 2%
Minimum supply voltage
3V + Indicator compliance (VI)*
Maximum supply voltage
90V
*The AP board needs a minimum of 3V to operate and this plus the maximum
operating voltage (compliance) of the indicator will determine the minimum power
supply voltage. For example, if the indicator can take up to 6V, then the minimum
power supply voltage will be 3+6 = 9V.
DATA LOGGING