ClearFox®Control Unit CU-M
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To be able to run the water level measurement, the “calibrated minimum” must be calibrated
(takes place automatically 14-days after bringing into operation, see chapter 9.1.2.1).
9.1.2.1 Automatic calibration
If ClearFox®Control Unit CU-M is simply installed to a plant, the automatic calibration will be
performed after 14 days. This delay shall ensure, that the pretreatment tank is filled at least to
the minimal level of the filling airlift and the reactor is filled at least to the minimal level for the
sludge return airlift.
After these 14 days, this process will be performed:
1) Clearwater removal
2) Filling with longer filling time to make sure that the level in the pretreatment is pumped
down to the minimum that can be reached using the filling airlift. The filling airlift now
“slurps” (does not pump properly, anymore, as it cannot suck anymore water).
3) “Sludge return” for some 60s to increase the level in the pretreatment so that the filling
airlift can pump properly, again.
4) Filling for 20s – the pressure at this minimal water level will now be stored as “calibrated
minimum”.
Now the ClearFox®Control Unit CU-M is able to measure the water level in the plant.
9.1.2.2 Manual calibration
In case the automatic calibration shall not be used for any reason, for example because the level
measurement shall be tested “instantly” (not after 14 days), the calibration can also be
performed manually. The manually entered values will not be overwritten by automatic
calibration.
To do so, the user must empty the water level in the pretreatment until there is only some 0.5-
1cm of water above the inlet of the filling airlift (the airlift must still be able to pump properly,
no slurping or sucking air). Now the filling airlift is activated in the manual control menu or web
page. The displayed pressure must now be noted. This pressure can now be entered in the
“Minimum” text field:
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