Reference Manual
00809-0100-4021, Rev FB
August 2011
Rosemount 3144P
3-24
HART
Open Sensor Holdoff
The
Open Sensor Holdoff
option, at the normal setting, enables the 3144P to
be more robust under heavy EMI conditions. This is accomplished by the
software having the transmitter perform additional verification of the open
sensor status prior to activating the transmitter alarm. If the additional
verification shows that the open sensor condition is not valid, the transmitter
will not go into alarm.
For users of the 3144P that desire a more vigorous open sensor detection,
the Open Sensor Holdoff option can be changed to a fast setting where the
transmitter will report an open sensor condition without additional verification
of the open condition.
DIAGNOSTICS AND
SERVICE
Diagnostics and service functions listed below are primarily for use after field
installation. The Transmitter Test feature is designed to verify that the
transmitter is operating properly, and can be performed either on the bench or
in the field. The Loop Test feature is designed to verify proper loop wiring and
transmitter output, and should only be performed after you install the
transmitter.
Loop Test
Field Communicator
The Loop Test command verifies the output of the transmitter, the integrity
of the loop, and the operations of any recorders or similar devices installed
in the loop. To initiate a loop test, follow the steps below with the
Traditional Fast Key sequence:
1. Connect an external ampere meter to the transmitter by shunting
the power to the transmitter through the meter at some point in the loop.
2. From the
HOME
screen, select
1 Device Setup
,
2 Diag/Serv
,
1 Test
Device
,
1 Loop Test
before performing a loop test. Select
OK
after you
set the control loop to manual. The communicator then displays the loop
test menu.
3. Select a discreet milliampere level for the transmitter to output. At the
CHOOSE ANALOG OUTPUT
prompt, select
1 4 mA
,
2 20 mA
, or
4 Other
to manually input a value between 4 and 20 milliamperes. Select
Enter
. It will indicate the fixed output. Select
OK
.
4. Check the installed transmitter in the test loop to verify it reads the value
that it was programmed to output. If the readings do not match, either the
transmitter requires an output trim or the current meter is malfunctioning.
After completing the test procedure, the display returns to the loop test
screen and allows the user to choose another output value. To end the
Loop Test, Select
5 End
and
Enter
then the Test device screen will appear.
The transmitter can simulate alarm conditions based on the transmitter’s
current hardware and software alarm configurations.
Traditional Fast Keys
1, 3, 6, 4
Device Dashboard
Fast Keys
2, 2, 7, 4
Traditional Fast Keys
1, 2, 1, 1
Device Dashboard
Fast Keys
3, 5, 1
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Industry Automation
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