Transmitter Behavior With Intermittent Sensor Detect Off; Open Sensor Holdoff; Diagnostics And Service; Test Device - Emerson Rosemount 3144P Reference Manual

Reference Manual
00809-0100-4021, Rev AA
March 2002

Diagnostics and Service

Transmitter Behavior with Intermittent Sensor Detect OFF

When the Intermittent Sensor Detect feature is switched OFF, the transmitter
tracks all process temperature changes, even if they are the consequence of
an intermittent sensor. (The transmitter in effect behaves as though the
threshold value had been set at 100%.) The output delay due to the
intermittent sensor algorithm will be eliminated.

Open Sensor Holdoff

HART Fast Keys 1, 3, 6, 4
The Open Sensor Holdoff option, at the normal setting, enables the Model
3144P to be more robust under heavy EMI conditions. This is accomplished
through the software by 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 Model 3144P that desire a more vigorous open sensor
detection, the Open Sensor Holdoff option can be changed to a fast setting.
With this setting, the transmitter will report an open sensor condition without
additional verification of the open condition.

Test Device

HART Fast Keys 1, 2, 1
The Test Device command initiates a more extensive diagnostics routine than
that performed continuously by the transmitter. The Test Device menu lists
the following options:
• 1 Loop test verifies the output of the transmitter, the integrity of the
loop, and the operations of any recorders or similar devices installed in
the loop. The ability to simulate an alarm is also available. See "Loop
Test" below for more information.
• 2 Self Test initiates a transmitter self test. Error codes are displayed if
there is a problem.
• 3 Master Reset sends out a command that restarts and tests the
transmitter. A master reset is like briefly powering down the transmitter.
Configuration data remains unchanged after a master reset.
• 4 Status lists error codes. ON indicates a problem, and OFF means
there are no problems.

Loop Test

HART Fast Keys 1, 2, 1, 1
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, perform the following procedure:
Model 3144P
3-22