Pressure Adjustment; Operation Polymax 1/120 °C - Dreve Polymax 1 Mode D'emploi

Polymax 1, 1/120 °C, 3 and 5

7.5 Pressure adjustment

The pressure inside the polymerisation
pot can be adjusted infinitely variable
between 3 bar and the maximum value
of the unit in question. For this purpose
pull out the reduction valve (24) at the
rear of the unit by means of the knob
and turn it anti-clockwise until there is
no resistance anymore (valve closed).
8. Operation Polymax 1/120 °C
Besides the general temperature area
of 0-95 °C the Polymax 1/120 °C also
permits to increase the water tempera-
ture to 120 °C. As the boiling point of
water is 100 °C, higher temperatures
may only be reached under pressure. In
order to avoid that hot water vapour of
120 °C escapes from the pressure pot
and in order to reduce the risk of scald-
ing when opening the lid, the Polymax
1/120 °C is equipped with a safety lock
which only allows the lid to open when
the operating pressure in the unit has
fallen and the temperature is lower than
95 °C (203 °F). This is also applicable
in case of power outage.
This means that in the application
process the pressure pot has to remain
closed when the unit is turned off and
pressure is exerted.
When the unit is turned on at the main
switch (14) the pressure pot exhausts auto-
matically and the lid (2) can be opened.
42
Start pressure-polymerisation (see 7.3)
and turn the pressure reduction valve
clockwise. The manometer (a) shows the
adjusted pressure. When attaining the
desired pressure, let knob latch again.
Important: Do not adjust the pressure
below 2.5 bar! Lower pressure may lead
to leakage of the pneumatic sealing
between polymerisation pot and lid.
Adjustment of temperature and poly-
merisation time is to be executed as
described from point 7 et seqq. If a
temperature > 95 °C is required, 95 °C
should be selected as pre-warming tem-
perature; the final temperature is to be
adjusted directly before the polymerisa-
tion process.
According to the temperature of
the water bath the objects have
to be inserted and taken out with
suitable instruments!
The time until the final temperature is
reached has to be added to the gen-
eral polymerisation time. This can differ
between 10 and 20 minutes, depending
on the water filling level. As long as the
value in the temperature indication dis-
play (d) blinks, the final temperature has
not been reached. The present tempera-
ture of the water bath can be checked
at all times by pressing the temperature
switch (e), (see point 7.4).