Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 14 (44)
Metering pump
flow rate in %
Procedure:
Press the "MENU" key
Move the cursor (blue backed text) to the line "set pH" by pressing the keys
or
.
Press the
OK
key.
Press the "NEXT" key
Move the cursor (blue backed text) to the line "p-range" by pressing the keys
or
.
Press the
OK
key.
You can move the cursor by pressing the arrow keys and
and also use the
and
arrow keys to set the proportional
range. The maximum and minimum possible values are shown
right and left in the display.
Proportional range
Press the
OK
key to save the settings.
Meaning of the proportional range
Adjustment
Benefits
Disadvantages
Diagram
Small P-range
Fast, accurate control
When switching on an overshoot
can occur
Wide P-range
No overshoot
Slow control, small deviations
between desired and actual
values possible
Setting the maximum pH metering time
The metering time limit is a safety function and prevents dangerous overdosing in cases of breakdown. Attention!
The higher the maximum dosing time is set, the more acid can be released in an uncontrolled manner in case of
any damage of the dosing tube.
MIN
MAX
0,10
2,00
1,00
1,00
7,20
800
721
675
D -2%
D +10%
pH
mV
Factory setting: 1,00
