6
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Level measurement
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6. Level measurement
The control units are fitted with an integrated pressure sensor as standard. This can establish the level by
means of the aeration unit (membrane aerator) secured to the base of the tank.
This level measurement is mainly used:
1. to save power when the wastewater infeed is low (underload detection)
2. to prevent sludge from leaking in the event of overflows (overload detection)
When supplied, this function is deactivated so during your start-up the system runs in automatic mode
regardless of utilisation - the amount of wastewater flowing in.
Function
6.1
The water level is measured at adjustable intervals at the start of a cleaning cycle by means of the pres-
sure in the membrane aerator. If the level in the tank exceeds a previously set level ("Level measurement"
in service level), the system starts a cleaning cycle. If the set level is not reached, the system automatical-
ly goes into cycle pause for the set interval. Only enough oxygen to maintain the biological components is
then pumped into the system. The water level continues to be measured during the cycle pause at set
intervals. Should sufficient wastewater have again flowed into the system after a certain time, the control
unit switches to the normal cleaning cycle once the set level is reached.
Activation of level measurement
6.2
The tank must be filled with water up to the level at which a cleaning cycle is triggered. This level depends
on the geometry of the tank and the number of connected inhabitants.
The recommended levels above the minimum water level are stated in the table below for the plastic
tanks of the Carat.
Note
Calibration has to be run in order to activate the level measurement. Calibration should be under-
taken at least once a year during all maintenance interventions because the pressure at the
aeration's membrane may change during operation.
Table 1:
Recommended setting for
levels
:
Carat
Type
2700
3750
4800
6500
H [cm]
100
115
130
155
Summary of Contents for one2clean+ XXL
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