4
Operation
4.1
Operator interface
4.2
Display
LED indicators
Liquid crystal display
1 8 5
mg/l
R232
Setpoint
DISPLAY1.CDR
LCD to display
measured values
and configurations
data
4 main operating keys
for calibration and
instrument configuration
Shift key for
Automatic / Manual
operation
Display LEDs for
limit contactor
relay
(switching state)
Display LED for
alarm function
Display of active
contact and key for
relay switchover
in manual mode
Field for inscription by
user
Fig. 4.1
Operating elements
Liquisys M
Display of current operating mode »Auto« (green LED) or »Manual« (yellow LED)
Display of controlled relay in »Manual« mode (red LED)
Display of working state of relays 1 and 2
LED green:
Measured value within allowed limits, relay inactive
LED red:
Measured value outside allowed limits, relay active
Alarm display e.g. when limit values constantly exceeded,
Temperature sensor failure or system error
1 8 5
mg/l
R232
Setpoint
DISPLAY3.CDR
Display for
measuring mode
(normal operation)
Display for
calibration mode
Display for
setup mode
(configuration)
Error
indicator
In measuring mode:
Secondary measured value.
In setup / calibr. mode
e.g. setting value
In measuring mode:
Main measured value.
In setup / calibr. mode
e.g. parameter
Function coding display
Display of working
state Rel 3/4:
inactive
active
Hold mode display
(current outputs reflect
last status)
For instruments with
communication:
Display to receive
messages.
Constantly visible in
Burst mode (with HART)
Sensor symbol
Temperature
offset
Manual
temperature
compensation
Fig. 4.2
Liquid crystal display
OM253FE4.CHP
Liquisys M COM 223 F / 253 F
Operation
Hauser
15
