
Factory settings
When the instrument is switched on for the first time, the factory settings are in effect. The
following table provides an overview of all major settings. Please refer to the description of the
individual functions in chapter 5 for all other factory settings (the factory settings are printed in
bold face).
Alarm contact
Normal operating state:
• Instrument in operation
• No error message available
(Alarm LED off)
→ Relay picked up
→ Contact 42/43 closed
Alarm state:
• Error message available (Alarm LED red)
or
• Instrument defective or voltage-free
(Alarm LED off)
→ Relay dropped out
→ Contact 41/42 closed
Function Factory setting
Mode of measurement
pH or Redox absolute, Temperature in °C
Type of temperature compensation
linear with reference temperature 25.0 °C
Temperature compensation
automatic (ATC on)
Limit value for controller 1
pH 16 (redox: –1500 mV or 0 %)
Limit value for controller 2
pH 16 (redox: +1500 mV or 100 %)
Hold
active during configuration and calibration
Contact 1 / 3
pH limit contactor, function off
Contact 2 / 4
pH limit contactor, function off
Current outputs 1 and 2*
4 ... 20 mA
Current output 1: measured value
for 4 mA signal current
pH 2
Current output 1: measured value
for 20 mA signal current
pH 12
Current output 2: temperature
value for 4 mA signal current*
0.0 °C
Current output 2: temperature
value for 20 mA signal current*
100.0 °C
* equipped accordingly
RELAY2.CDR
Normal operating state
Alarm state
41
42
43
41
42
43
Fig. 5.3
Recommended fail-safe
circuit for an alarm contact
Instrument configuration Liquisys M CPM 223 / 253
24 Endress+Hauser
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