B&C CL 7685 Operator's Manual page 6

B&C Electronics
Alarm relay
The unit contains a SPST relay designated as an alarm relay.
This relay may be used to warn of various conditions that might indicate operational problems.
The relay will activate on either high or low concentration conditions, or on failure of the control
relays to maintain proper control.
In addition this relay may be programmed for either normal or fail-safe operation.
Cleaning function
The unit contains a SPST relay designed for the auto clean cycle.
It's possible manually activate the cleaner to test its operation.
The operator can change the frequency of cleaning.
The configuration routine selects:
- auto/manual operation
- the cleaning time
- the holding time.
During cleaning and holding time:
- messages are flashing
- analog output is held constant
- set-points and alarm relays are deactivated.
Operating mode
The instrument is provided with 3 programmable modes of operation.
- Automatic operation (AUTO):
The Automatic mode is the normal operation mode of the unit.
- Measuring operation (MEAS.):
In this mode of operation the display indicates only the concentration but
the control relays are deactivated.
This would be the mode to use if the relays are not being used for alarm or control functions.
The measuring mode of operation is useful for start up or for manual operation of disinfection plants.
Operator's Manual - Rev. C - 05/05
CL 7685
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6