Page 35
indicating the current passing through the loop proportional to
the input of transmitter which is controlled by the output of the
525Plus. Choose
PWRM%
if your would like the mA display
in percent of 4-20 milliamps.
If
PWRM
or
PWRM%
is selected an additional menu
selection of
LEAK DETECT
will appear. When
LEAK
DETECT
is turned on the 311Plus will display
LEAK
and the
amount of current that is uncontrolled in the loop. This may be
due to a faulty transmitter, corrosion causing a bridge to
ground or moisture present at some connection point. When
LEAK DETECT
tests a loop with leakage the loop mA
signal will be affected.
HART 250
Ω
- turn on the 250
Ω
resistor if you are powering up
a HART transmitter. This provides the loop load required for
HART communication.
EXIT MENU
- exits this menu immediately and saves any
changes. Menu will automatically exit after 15 seconds of
inactivity.
Typical
2-Wire
Transmitter
+ IN - REF -OUT+
311.2
°F
HART
5 6
PWRM
12.523 mA
Pt 100
α
=3850
00.51 mA LEAK
(Enlarged Display)
PWRM
00.51 mA LEAK
12.523 mA
311.2
°F
Pt 100
a
=3850
5 6
HART
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