Hanna Instruments HI 8410 - Manual (Page 11)

11
• Overtime dosing
When enabled this feature ensures that overdosage is avoided.
Select 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 terminals of the proper connectors. (see
picture, terminals 1, 2)
• Hysteresis knob
Put the hysteresis knob in the desired position.
The dosage will be active according to the DO
reading, set point value and the hysteresis 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 (right side of the
switch).
Connect the “+” wire from the recorder to terminal 1 on the
instrument and the other wire (common) to terminal 2 for 4-20 mA
recorder output or terminal 3 for 0-20 mA recorder output.
Note: Only one recorder output connection is permited. In order to avoid
malfunction leave unconnected the unused terminal.