Memmert TTC 256 Temperature test chamber (Generation 2003) - Manual (Page 25)

25
Operation and control
5.4 Opening and closing the door
Danger!
When opening the chamber
door, hot steam may escape
and scald you in the face if the
test chamber was in operation
directly before this. Remain
behind the door when you
open it and let out the steam,
or allow the test chamber to
cool down before opening the
door.
Warning!
Depending on operation, the
surfaces in the chamber inte-
rior, the viewing window and
the chamber load may be very
hot or very cold. You could
suffer from burns or frostbite
if you touch these surfaces.
Allow the chamber interior to first adjust to room temperature after
opening the door, or use heat-resistant protective gloves.
► To open the door, pull the handle upwards and swing the door open ( Fig. 17 ).
► To close the door, press the handle downwards.
5.4.1 Opening and closing the door with high and low temperatures
The airtight construction of the climate chamber leads to physical effects when opening and
closing the doors, due to the temperature-dependent volume change of the enclosed air.
At high temperatures, excess pressure is produced in the chamber, since the ambient air in-
troduced heats up and expands. Do not close the doors with force in this case, but wait a few
seconds before closing, so that the excess pressure can dissipate. To do this, press the door
lightly, wait until the excess pressure has dropped, and only then close the door properly.
At low temperatures, a vacuum is created in the chamber after the doors have been closed.
As long as the pressure is not compensated, it is difficult to open the doors. In this case you
should wait for two minutes until the pressure is compensated.
The pressure compensation can be accelerated considerably by removing the silicone plugs
( Fig. 18 on page 26 ).
Fig. 17
Opening and closing the door