Diagnostics And Service - Emerson Rosemount 3144P Reference Manual

HART Commissioning
December 2019
transmitter behaves as though the threshold value had been set at 100 percent.)
The output delay because of the intermittent sensor algorithm will be eliminated.
3.11.5 Open Sensor Holdoff
HART 5 Fast Keys
HART 7 Fast Keys
The Open Sensor Holdoff option, at the normal setting, enables the Rosemount 248 to
tolerate heavy EMI disturbances without producing brief periods of alarm. 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 transmitter that desire a more immediate open sensor detection, the
Open Sensor Holdoff option can be changed to a fast setting. On this setting, the
transmitter reports an open sensor condition without additional verification of the open
condition.
3.12

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.
3.12.1 Loop test
HART 5 Fast Keys
HART 7 Fast Keys
The Loop test variable verifies the output of the transmitter, the integrity of the loop, and
the operations of any recorders or similar devices installed in the loop.
108
2, 2, 7, 4
2, 2, 7, 4
3, 5, 1
3, 5, 1
Reference Manual
00809-0100-4021
Rosemount 3144P