729 Pro
Users Manual
26
Loop Power +24V ON
The Product supplies loop power at 24 V dc to a current transmitter disconnected from
the system. To supply 24 V loop power:
1. From the HART menu, push
B
(
Loop Power +24V ON
). The Product polls the
bus to see if a transmitter is connected.
2. With the transmitter disconnected from normal loop power, connect the Product test
leads in series with the instrument current loop as shown in Figure
.
The mA display shows measure loop current.
Figure 10. Connection with Loop Power Enabled
Enable HART 250
Ω
The Product has a selectable 250
Ω
HART resistor to facilitate use with HART devices.
Enable the HART resistor when you connect the Product to a HART device. The HART
resistor defaults to OFF.
To turn on or turn off the HART resistor, push
C
(
Enable HART 250
Ω
) or (
Disable
HART 250
Ω
).
TEST DC PWR
+ –
+
–
–
+
