Liquisys M CLM223/253
Commissioning
Hauser
49
6.4.7
Relay contact configuration
To use the RELAY function group you need a relay board which is not part of the basic
version.
The following relay contacts can be selected and configured as desired (max. four contacts,
depending on options installed):
• Limit contactor for measured conductivity value: R2 (1)
• Limit contactor for temperature: R2 (2)
• PID controller: R2 (3)
• Timer for cleaning function: R2 (4)
• Chemoclean function: R2 (5)
• USP/EP: R2 (6) and R2 (7) (for Plus Package, conductive only)
Limit contactor for measured conductivity value and temperature
The transmitter has different ways of assigning a relay contact.
Switch-on and switch-off points and pick-up and drop-out delays can be assigned to the limit
contactor. In addition, you can configure an alarm threshold to output an error message and
to start a cleaning function in conjunction with this.
These functions can be used both for conductivity measurement and for temperature
measurement.
Please refer to Fig. 29 for a clear illustration of the relay contact states.
• When the measured values increase (maximum function), the relay contact is closed as of
t
2
after the switch-on point (t
1
) has been overshot and the pick-up delay has elapsed
(t
2
- t
1
).
The alarm contact switches if the alarm threshold (t
3
) is reached and the alarm delay
(t
4
- t
3
) (field F3) has also elapsed (error E067 to E070).
• When the measured values decrease, the alarm contact is reset when the alarm threshold
(t
5
) is undershot as is the relay contact (t
7
) after the drop-out delay (t
7
- t
6
).
• If the pick-up and drop-out delays are set to 0 s, the switch-on and switch-off points are
also switch points of the contacts.
Settings can also be made for a minimum function in the same way as for a maximum
function.
P9
Enter CC setpoint
(for P7/P8)
1000
μ
S/cm
0 to 9999 mS/cm
Selected value is an absolute value. This
function is mainly used for batch processes
and single-sided limit switches.
Coding
Field
Setting range
(Factory settings, bold)
Display
Info
P9
µS/cm
Setpoint
1000
Summary of Contents for Liquisys M CLM223/253
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