Large Display Temperature Meters
Instruction Manual
28
Isolated 4-20 mA Output Transmitter Connections
The Digital Temperature Meter can be equipped with an optional isolated 4-20
mA output transmitter that can be programmed to produce a 4-20 mA signal for
virtually any temperature span displayed. For best performance, a 500 count
span is recommended between the 4 and 20 mA outputs. (Ex. 0.0
°
C = 4 mA,
50.0
°
C = 20 mA).
The following diagrams illustrate the 4-20 mA output signal being powered from
the Digital Temperature Meter’s internal power supply (AC powered meters only)
and by an external power supply.
Figure 9.
Output Loop Powered by Meter
Figure 10. Output Loop Powered from External 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.
