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Commissioning
Accurate metering is only possible if the counter pressure remains fairly
constant; this should be above 1 bar.
When metering with atmospheric discharge, an injection valve with 0.5
bar response pressure should be assembled at the end of the line. Or a
back-pressure valve should be assembled directly onto the liquid end in
order to create and maintain a counter pressure of approx. 1.5 bar.
If the level of the fluid of the supply tank is above the pump in operating
condition, the response pressure is on the suction side. In this case the
counter pressure should be so high that a minimum differential pressure
of 1.5 bar exists. If this is not the case a back-pressure valve or a spring-
loaded injection valve with the respective response pressure should be
used.
PLEASE NOTE:
A back-pressure valve or a spring-loaded injection valve is not an
absolutely leakproof isolating valve!
Therefore on the suction side an isolating valve is to be installed which is
closed when the pump is idle.
An output flow once set and possibly confirmed by calibration can be
reproduced exactly by setting the stroking rate. This is processed digitally
and reacts without mechanics absolutely linear. Thus an excellent
reproducibility is ensured.
ATTENTION:
For accurate metering please observe the following:
The metering capacity of the pump was determined in warm
operating condition (min. 3 hours continuous operation at maxi-
mum stroking rate)!
Due to the characteristic data of the gamma/4 metering pump
higher capacities can occur until the operating temperature is
reached.
Page 41 of 88 pages
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