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October 2020
2. Power up the level switch.
3. Check the quick-start settings.
Postrequisites
The Rosemount 2555 is now calibrated and ready to be configured.
4.3
Measurement mode
The level switch indicates the actual measured capacitance and the status of
the signal output.
(1)
Display
*** u
*** c
(1)
If unexpected messages are displayed, see
(2)
Green or yellow depending on setting of FSH and FSL.
(3)
Resolution is 0.1 pF (< 100 pF) or 0.5 pF (> 100 pF). If values are > 100 pF, a dot
behind the number means 0.5 pF (e.g. 100. means 100.5 pF)
Note
If the actual measured capacitance is higher than electronics can measure
(i.e. > 400 pF with sensitivity setting >= 2 pF or > 100 pF with sensitivity
setting <= 1 pF), the level switch will state
is valid, since the actual capacitance is well above the calibrated switch
point. Also, the output signal indicates the probe is covered by showing
Quick Start Guide
a) The calibration is in progress when the displays indicate
and the LED is red and flashing.
b) After approximately 45 seconds, the calibration completes
and indicates the actual measured capacitance and the letter
is indicated for the uncovered probe status.
u
a) Use the quick-start menu (see
and change the factory settings for Fail Safe High and Low,
signal output delay, and sensitivity.
LED
Green or yellow
Quick-start
menus) to review
Description
(2)
Actual measured
capacitance in pF
Actual signal output:
states uncovered probe
or covered probe
Maintenance and error
or
. The measurement
400c
100c
Quick Start Guide
CAL
(3)
.
u
c
.
messages.
.
c
21
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