6.3 Micropump flow rate
adjustment
There are two different possibilities to adjust
the flow rate of the micropump. It can be ad-
justed by the use of a thumb wheel or me-
tering rings.
!
The VTEC unit has to be discon-
nected from power before any
adjustment.
!
Before adjusting the micropump
flow rate, the VTEC unit has to be
depressurized.
!
Table 3 on page 32
helps you
for an optimal adjustment of the
micropump flow rate. It shows the flow
rate (mm3 per minute) according to the
metered volume adjustment and the
working frequency of the micropump.
6.3.1 Adjustment with thumb wheel
• Remove the protection cap from the
thumb wheel.
• Turn the thumb wheel to the left to reduce
and to the right to increase the flow rate.
• A complete turn of the thumb wheel cor-
responds to a flow rate of 5 (small flow) or
15 mm
3
/ stroke (large flow).
• Put back the protection cap on the thumb
wheel.
6.3.2 Adjustment with metering ring
• Remove the protection cap from the
thumb wheel.
• Remove the clip from the groove.
!
When the VTEC unit is delivered,
the delivery rate of the micro-
pump is set at the maximum ( 30 or 90
mm
3
/ stroke according to the model).
!
We suggest to start the setting
from the maximal flow rate
(thumb wheel fully turned to the right)
!
When the VTEC unit is delivered,
the micropumps have a set of dif-
ferent metering rings (0, 3, 5, 10, 15 and
20 mm
3
or 0, 30, 45 and 60 mm
3
).
!
When the micropump has no me-
tering ring, it is set at the maximal
flow rate (30 or 90 mm
3
/stroke accord-
ing to the model).
• Remove the metering ring (when one) and
put the new metering ring. Figure of de-
livered volume is embossed on every me-
tering ring.
• Put back the clip on the groove.
• Put back the protection cap on the thumb
wheel.
30
