7088-8000
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2.3 Current Loop Wiring and Current Loop Powering Option
The flowmeter has a 4 to 20 milliampere (4 to 20 mA) current loop output. The current
loop can be selected to be self-powered or loop-powered. The wiring connections to the
current loop vary depending on which powering option is selected.
NOTE:
For information on calibrating and testing the current loop and setting the current
loop span, refer to Chapter 6.
The flowmeter comes shipped with the current loop self-powered. For loop-powered
operation, the current loop must be driven from an external supply. In this case the
flowmeter acts as a passive two-wire transmitter. The current loop powering option is set
by moving jumpers on the current loop board which is located inside the breakout box.
(Four screws must be removed from the back of the breakout box to access the jumpers.)
A diagram of the jumper settings is located on the inside cover of the breakout box and is
also illustrated in Figure 2-3.
NOTE:
The current loop output is rated for a loop resistance of up to 1000 ohms and is
isolated for up to 5 kV when loop powered.
CAUTION:
To avoid possible damage to the flowmeter due to an accidental short,
disconnect power before removing the back cover of the breakout box.
(Disconnect the breakout box from the flowmeter and from the AC
adapter/battery charger.)
Figure 2-3 Current Loop Power Jumper Settings for DCT-7088
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