Model PD655 Large Display Process Meter
Instruction Manual
27
Isolated 4-20 mA Output Option Connections
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 process/rate
display with at least a 501 count span.
The meter can power both the input loop and the isolated 4-20 mA output loop.
The following diagrams illustrate the 4-20 mA output signal being powered from
the meter’s internal power supply (AC powered units only) and by an external
power supply.
Figure 13.
Both Input and Output Loops Powered by Meter
Figure 14.
Input Loop Powered by Meter, Output Loop Powered from
External 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.
