2. Press and hold the
CAL
button again for three seconds to restart the
calibration.
If any other messages are displayed, see
Maintenance and error messages
Postrequisites
The Rosemount 2555 is now calibrated and ready to be configured.
4.6
Resetting the first power-up calibration
An already calibrated level switch can be reset to perform a new power-up
calibration. This may be needed if installing it in a different silo or if it has to
be pre-configured before being shipped.
To do a reset:
1. Press and hold the
CAL
button for three seconds.
2. Switch off the voltage supply when
CAL
appears on the display.
Since the calibration was started, but not successfully finished, it
automatically starts again when the level switch is powered-up.
Note
Only the calibration is affected. The settings in the menus are not changed.
4.7
Data storage of the last valid calibration values
If the power supply is switched off, the last valid calibration values are
stored, and are still valid, when power is switched on again.
4.8
Manual function test (proof test)
The Rosemount 2555 can self-test the internal electronics and external
connected signal evaluation.
Prerequisites
The proof-test must be operated in Measurement mode.
Procedure
1. Press and hold the
TEST
button for three seconds.
TEST
The display shows
TEST
when the testing is started.
2. Wait approximately 20 seconds until the test is completed.
During the test, the LED turns yellow and the signal output relay
changes state for approximately 10 seconds before returning to
normal operation.
October 2020
Quick Start Guide
Quick Start Guide
29
