ProMinent delta DLTa optoDrive Operating Instructions Manual page 60

Set up
Suction stroke
Viscosity in mPa "Dosing" setting
0...50 "normal"
50...200 "HV1"
200...500 "HV2"
500...1000 "HV3"
60
During quasi-continuous metering for high accuracy set
–
as large as possible a stroke length.
The slowing of the discharge stroke only becomes
–
noticeable at lower stroke rates.
– At maximum stroke rate, 'slow' is identical to 'fast' !
Slowing of the suction stroke leads to a lower capacity.
–
In both metering modes it is possible, to selectively also slow the suction
stroke. For the case of gaseous feed chemicals, the slow suction stroke
prevents cavitation and consequently increases metering precision ( b)
and c) ). In this way, it is possible to prevent the main cause for imprecise
metering with high viscosity feed chemicals, namely the incomplete filling
of the liquid end.
p
a) Suction
stroke"normal"
b) Suction
stroke"HV1"
c) Suction
stroke"HV3"
Fig. 29: Pulsed and quasi-continuous operation with:
a) normal suction stroke
b) slightly slowed suction stroke
c) maximally slowed suction stroke
The metering behaviour of the pump can be matched to the viscosity of
the feed chemical.
Suction stroke
slowing
none
slight
medium
Maximum
For the adjustment for slowing the suction stroke dependent upon the feed
chemical viscosity - see the "Adjustment" chapter.
Discharge Discharge
stroke"fast" stroke"slow"
P_DE_0006_SW
Max. stroke rate Remarks
200
160
120 for valves with springs
80 for valves with springs
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t
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