Generation Of Vacuum - Tecsis 1351.085.005 Betriebsanleitung

Betriebsanleitung - Operating manual
4.2

Generation of vacuum

First, check whether the change-over valve (4) has to be actuated (see
sticker on the device). For this purpose use a pen or a small screw -
driver. The encasement of the switch is intended to help prevent
unintentional actuation.
Never actuate the change-over valve (4) when the hand test
pump is under pressure or vacuum! Actuate the change-over
valve only when the relief valve is open.
Please make sure that the pressure relief valve (3) is not closed
completely.
Turn the fine adjustment valve (2) clockwise up to the end ( stop can be
felt).
Carefully turn in the pressure relief valve (3) until the valve closes.
You will not notice any .hard stop.
Turn the fine adjustment valve (2) anti-clockwise to get a first vacuum.
Operate the hand pump (5) smoothly and slowly until the requested
vacuum has been reached.
After increasing the vacuum, the reading may slightly increase
again
thermodynamic effects, the tube connection and the sealing
gaskets. If the vacuum drop does not come to a standstill,
check the measuring circuit for tightness.
Due to the low volume of each compression stroke of the test
pump, only small volume test specimens should be tested.
A vacuum reduction is achieved by carefully opening the relief valve (3)
for about 30 seconds, which is caused by
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