Calibrating Level Measuring; Starting Level Measuring - Graf oneAdvanced Operation Manual

9.1.3

Calibrating level measuring

Calibrating adjusts the offset for the level's characteristic curve. This involves adjusting the
measurements to the height of the air lifter or membrane pipe aerator. Level measuring always
makes use of pressure sensor 1.
Calibration can be accessed in the Service menu under "Pressure sensor" or following the entry
of the password "8888" (3–9 PU) or "9999" (from 10 PE) for the Service menu.
Before and during calibration, the water level must be measured from the tank base.
Calibration functions
The controller guides the user through the calibration and displays the remaining time and the
current pressure. The controller performs 3 measurements. Afterwards, the measured water
level must be entered (in cm).
In the event of an implausible input, the value can be reentered or the calibration aborted. If the
entry corresponds to the calculated value, the calibration can be saved. The displayed offset is
the distance between the tank base and the lifter's or membrane pipe aerator's blow-in point.
9.1.4

Starting level measuring

The first chamber (sludge reservoir/buffer), where the feed lifter is located, must be filled with
water up to the height at which a cleaning cycle is to be triggered. This level depends on the ge-
ometry of the tank and the number of connected inhabitants (PE). The recommended buffer
heights a (see Figure 14, p 76) above the minimum water level are specified for the various con-
figurations in the table below.
Recommended settings for the buffer height:
Typ
e
PE 3 5 7
Typ 2700 3750 4800
e l l
b
100 118 140
[cm]
9. Additional controller functions
9 10 14
6500 4800 6500
l l l l
165 122 142
10 16 22
2 x 2 x 2 x
2700 l 3750 l 4800 l
100 113 126
77 / 137
28 32 44
4 x 4 x
2 x
3750 4800 6500
6500 l
l l
146 113 126 146
50
4 x
l