Model PD750, PD751, PD752 Universal Temperature Meters
Instruction Manual
ISOLATED 4-20 mA OUTPUT OPTION (
OvtPvt
)
The meter can be equipped with an isolated 4-20 mA output signal option that can
be programmed to produce a 4-20 mA output for virtually any input.
Connections
The following drawings illustrate the 4-20 mA output signal being powered from the
meter’s internal 24 V power supply (AC powered units only) and by an external
power supply.
4-20 mA output signal being powered by meter’s internal 24 V power supply.
AC powered units only
4-20 mA output signal being powered from an external 24 V power supply.
If the output loop is powered by an external supply, the loop power supply
must be turned on before the meter is turned on. Otherwise, the output loop signal
may be incorrect.
Calibration
The isolated 4-20 mA output signal is calibrated using the front panel
ENTER
button
and uses the same
S
ingle
B
utton
S
caling technique that is used to calibrate the sig-
nal input and the alarm set and reset points. A multimeter may be connected to the
output terminals to verify calibration, but it is not required as part of the calibration
process.
+
+
+
-
-
-
Signal
Input
Meter, Recorder
Controller, etc.
- +
EA C P P L L
+
+
+
+
-
-
-
-
Loop
Power Supply
Meter, Recorder
Controller, etc.
Signal
Input
- +
EA C P P L L
!
18
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