4
Operation
4.1
Operator interface
4.2
Display
LED indicators
Liquid crystal display
12.15
mS/cm
R232
Setpoint
DISPL1-E.CDR
Liquid crystal display
for display of measured
values and
configuration data
4 main control keys for
calibration and
instrument configuration
Key for switching
between automatic /
manual operation
LED indicators for
limit contactor relays
(switching state)
LED indicator for alarm
function
Display of active
contact and key for
relay switching in
manual mode
Field for user labelling
Fig. 4.1
Operating elements of
Liquisys M
Indication of current operating mode: “auto” (green LED) or “manual” (yellow LED)
Indication for relay controlled in “manual” mode (red LED)
Indicates the state of relays 1 and 2.
LED green: measured value is within permissible limits, relay is inactive.
LED red:
measured value is outside permissible limits, relay is active.
Alarm indication for continuous limit violation, temperature sensor failure or system errors
(see error list in chapter 7)
1 2 1 5
mS/cm
R232
Setpoint
DISPL3-E.CDR
Measuring mode
indicator (normal
operation)
Calibration mode
indicator
Setup mode
indicator
(configuration)
‘Hold’ mode
indicator (outputs
reflect last current
status)
In measuring mode:
quantity measured.
In setup mode:
parameter adjusted
In measuring mode:
secondary measured value.
In setup / calibr. mode:
e.g. parameter setting
Automatic
temperature
compensation
display
Measuring cell
symbol, flashes
during ongoing
calibration
Error indicator
In measuring mode:
main measurement value.
In setup / calibr. mode:
e.g. parameter
Rel 3/4 state indicators:
inactive,
active
Function coding display
Fig. 4.2
Liquid crystal display
Operation
Liquisys M CLM 223 / 253
16
Hauser
