10.4.2 Calibration / pump
The specified metering capacities in metering pumps are always determined under ideal
conditions (metering of water at 20 °C, short suction and metering pipes, rated back-pressure,
no pressure-boosting valves in the metering line).
As these conditions never occur in practice, you are advised to calibrate the actual metering
rate of the metering pump under prevailing local conditions.
10.4.2.1 Preparation
Fig. 10.55 Calibration / pump: Preparation
Connect the pump ready for operation on
pressure side
(see chapter
7 “Installing the device”).
Fill a suitable measuring cylinder
and insert the suction line.
NOTE
The volume of the measuring cylinder should be 1/50 of the metering pump rate in litres/h.
During this process, the suction line must not change its position.
The calibration of the metering pump is only valid for the currently set stroke length setting.
After changing the stroke length, the calibration must be performed again.
10.4.2.2 Calibration / Start
Fig. 10.56 Calibration / Start
to : The pump runs 122 strokes (ca. 1 min).
The strokes are counted down from 122 to 0.
By activating the 'Menu/Exit’ function, the running calibration can be interrupted.
to : After the running process, the amount removed from the measuring cylinder (see
chapter
10.4.2.1 “Preparation”) must be read off.
This quantity is then entered as the calibration value (in ml or l).
10.4.3 Calibration / pump with oval gear meter (OGM
PLUS
)
If a dongle box and an oval gear meter are connected and the “oval gear meter” function
(see chapter
10.3.11) is activated, the oval gear meter pulse rate recorded is automatically
displayed at the end of the calibration process.
This is offset against the specified calibration value. A correlation thus occurs between the
oval gear meter pulses and the metered quantity.
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