18
börvärde bas
börvärde syra
bas-dosering
ärvärde
syra-dosering
börvärde bas
doser-område
börvärde syra
max bas-dos (ca 100 pulser/min)
ärvärde
max syra-dos
ca 30 pulser/min
ca 60 pulser/min
ENGLISH
Autodos M
MA60-10E
ENGLISH
Autodos M
MA60-10E
Acid set value
Alkali set value
Actual value pH
Acid dosing
Alkali dosing
Acid set value
Alkali set value
pH actual value
approx. 30 pulses/min
Max. alkali dosing
(approx. 100 pulses/min)**
Max. acid dosing
approx. 70 pulses/min
Dosing range
Adjusting set value – pH regulation
Set value adjustment for pH regulation is carried out by pressing and holding the
Set value
button [13].
The selected pH set value is then shown in the display. To change the set value, hold the button depressed while pressing
↑ or ↓ under display 3. Pressing and holding an arrow button for about one second triggers a “fast forward” function until the
button is released.
The figures below show dosing with both pH-elevating (alkali) and pH-lowering (acid) agent. The principle is the same, but the
direction is reversed.
On/Off controlled pH regulation
P-band* indicates the range within which dosing is steplessly changed from 0 to maximum dosing. In the example above,
acid is dosed when the actual value (= pH value) is greater than the set value. Acid and alkali are dosed when the actual value
is less than the alkali set value.
At maximum dosing, the dosing pump gives max. frequency* strokes/minute.
Presume there is acid dosing (pH value = 7.54, acid set value = 7.40), P regulation (P-band = 0.20) and frequency dosing
(max. frequency = 50 strokes/minute). Dosing is then calculated as follows:
Does = (pH actual value – acid set value) / P-band x Max. frequency = (7.54–7.40) / 0.20 × 50 = 35 strokes/minute.
If the dose as calculated above is negative, 0 strokes/minute is dosed. If the dose is greater than 50, then 50 strokes/minute
is dosed.
Frequency controlled pH regulation
* set in “Electrode specific configuration”.
** Default value. Adjustable to max. 180 pulses/minute
