Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check
carefully the validity of this document with respect to his product. manual-no.: 999019 / 22/12/2009
page 21 of 29
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Reassemble the pumping unit.
Individual performance check of a pump head :
By measuring the pressure at the inlet port of the individual
head:
Use a suitable vacuum gauge (e. g. DVR 2, cat. no.: 68 29 02),
make sure that it is correctly calibrated, and measure the pres-
sure at the inlet port. A vacuum of less than 120 mbar should
be indicated.
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If the reading is higher, recheck the pump chamber and make
sure that the valves and the diaphragms are correctly seated
(diaphragms concentric with bore).
Assembling fittings:
➨
Use open ended wrench (w/f 15) to reconnect hose to elbow
fitting.
➨
Tighten union nuts first by hand and then tighten one full
turn using open ended wrench (w/f 17).
If the pump does not achieve the ultimate pressure:
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In case the diaphragms and valves have been replaced, a run-in period of several
hours is required before the pump achieves its ultimate vacuum.
If all pump heads achieve a vacuum below 120 mbar but pump does not achieve the
ultimate total pressure:
Check hose connectors between pump heads and manifolds for leaks. If necessary
recheck pump chamber. If necessary disassemble fittings again and screw in the el-
bow fittings another turn, use PTFE sealing bond as necessary.
