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Repair
10.3
Calibrating the dosing rate
a)
1
2
Fig. 22: a) Adjust indicating dial, b) Schematic assembly for calibration
66
It is only worth calibrating the dosing rate if you wish to carry out particu‐
larly precise metering at a completely different back pressure.
The dosing rate of the hydraulic diaphragm metering pump is only
dependent upon back pressure to a minimal extent. And the pumps are
calibrated on the factory premises to the maximum operating pressure.
(Value of maximum operating pressure - see the pressure stage on the
indicating dial or the safety relief valve.)
The plant or production facility can calibrate each pump to a back pressure
that is lower than the nominal pressure ordered.
The following pressure stages (in bar) are available:
Pump
7
HP4
X
WARNING!
ATEX pump only: Take suitable precautions in poten‐
tially explosive atmospheres regarding the feed chemical
in the open measuring cylinder - see handling instruc‐
tions below.
The dosing rate can only be calibrated when the dis‐
charge line is connected and under normal operating
conditions. As the dosing rate is dependent upon the
actual back pressure.
4
5
Materials required:
Measuring beaker
n
Stop watch
n
1.
Switch off the pump.
2.
Turn the stroke adjustment dial to maximum, beyond 100% to the
stop.
3.
API versions only: Remove the metal cap from the stroke adjust‐
ment dial.
4.
Remove the cover (4) from the stroke adjustment dial and slacken
off the screw (3) beneath slightly.
5.
Guide the suction line into the measuring beaker - see Fig. 22.
6.
Fill the measuring beaker with feed chemical.
7.
Start the pump.
10
16
X
X
b)
t
1
Q
1
t
2
Q
2
25
X
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