Instruction Manual
OCM F
Page 72
OCM F - Rev. 04 as of 18.02.2014
®
9.6
Calibration and Calculation Menu (CAL)
This menu is to adjust the level measurement, to adapt flow velocity and analog
outputs to following systems and to simulate relay switching events and analog
outputs.
Fig. 9-65
CAL- menu selection
9.6.1 CAL Menu “Level“
This menu allows to adjust level measurements.
Values from -1000 mm to +1000 mm (39.4 in) can be entered. This adjustment
is required only if the level measurement utilises a pressure measurement cell.
Fig. 9-66
Submenu - level
Due to physical reasons the pressure measurement cell is subject to zero
point drift. It is recommended to adjust the pressure sensor to the zero point
regularly (recommended interval: 6 months).
Required values have to be investigated with the sensor being removed if
possible or if the water level is as low as possible. The correct filling level has
to be investigated as accurate as possible before adjusting by using another
suitable measurement method (value = 0 if the sensor has been removed from
the medium).
Enter the investigated value as reference.
Investigating the zero point of the pressure measurement cell is often carried
out by measuring the current filling level with a yardstick, a ruler or similar
without removing the sensor. After the ruler or similar has been held into the
medium, the respective reading is entered as reference value.
This is why the filling level for reference measurement purposes has to be
measured always from top down (see Fig. 12-1).
Summary of Contents for osm-f
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