Pressure Sensor - Graf oneAdvanced Operation Manual

8.2.4

Pressure sensor

The control units are fitted with two pressure sensors that can be used to measure the level
and/or for monitoring the operating pressure. Before use, a specialist must first perform an on-
site calibration ("service calibration"). The functions and their execution are described in Subsec-
tions 9.1 and 9.2.
Service » Pressure sensor
Level measuring
8. Service menu for authorised specialist
Setting the parameters for level-dependent operations. The
sensor must be service-calibrated (see Subsection 9.1.3).
Cycle start from
0–999 cm
Enter the level above which a cycle is to be started.
A value of 0 cm deactivates level measurements, and the
plant operations are time-controlled. The factory default is
0 cm.
Overflow alarm from
0–999 cm
Level above which an alarm sounds. Meaningful is e.g. the
distance between the tank base and the emergency overflow,
or just under.
The setting "0 cm" deactivates the fault message "Max level".
It is not necessary for the overflow alarm to be activated for
the plant to function correctly.
Recirculation
0–999 s
This selects the duration of the recirculation or the sludge
lifter's runtime. We recommend 120 s.
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