11
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Overtime dosing
When enabled this feature ensures that overdosage is avoided. Se-
lect a desired maximum dosage period. If the dosage relay is active
more than the selected period an alarm condition is activated and the
dosage relay is deactivated.
To leave the overtime dosage alarm status change the position of the
OFF/AUTO/ON
switch to OFF and then to AUTO again. The overtime
counter is restarted.
To set the overtime dosing period rotate the overtime knob to the
proper position. The time can be set between approx. 5 min to 60 min
(from MIN to MAX position).
To disable the overtime dosage feature make
a short with a jumper wire between the ter-
minals of the proper connectors. (see picture,
terminals 1, 2)
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Hysteresis knob
Put the hysteresis knob in the desired posi-
tion. The dosage will be active according to
the DO reading, set point value and the hys-
teresis set value.
DOSING MODE SELECTION
The DOSAGE switch and the corresponding right side LED on the front
panel are used to select and indicate the dosing mode.
OFF
mode
The dosage is disabled. The corresponding
DOSAGE MODE LED blinks.
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Alarm Contacts
(terminals 5, 6)
During normal operation these terminals
remain closed.
If the measured D.O. level is not within the
tolerance of the set value, the alarm con-
tact is open. These contacts act only as a
switch. See also page 15.
