Memmert PM 200/400/500 Pump Module (Generation 2003) - Manual (Page 14)

VO page 14
8 Loading and Inertgas
• The load must only be placed on the thermoshelves.
• Slide in the thermoshelves up to the stop.
• Do not dry or heat any load which releases fumes developing an inflammable mixture in
combination with air.
• Provide optimum heat transfer from the thermoshelf to the load. Ensure that the load rests properly
on the tray.
• For maximum number of trays and load capacity of the thermoshelves see the Table Technical data .
• The table below gives recommendations for the appropriate loading of the trays which in turn is
essential for a largely uniform temperature distribution inside the oven.
Safety note:
When the oven is being operated with inert gas (nitrogen, helium, neon, argon, krypton) there is a small
escape of the gas used into the environment.
The list of MAK values (maximum workplace concentration) and of BAT values (biological workplace
tolerance values) does not contain any information concerning the inert gases mentioned above.
It is however still important to ensure good ventilation of the room.
The appropriate specifications of the trade association publication „Guidelines for the Laboratory“ (ZH1/119)
as well as DIN 1946 Part 7 „Room Air Technology (VDI Ventilation Rules)“ should be observed.
Precautions when handling gas cylinders:
• Avoid any open fire in the area near the gas cylinders. Inert gas is not combustible, but it is
possible for the cylinder to burst.
• Store cylinders below 50°C in a well ventilated location. Prevent ingress of water and any return
flow into the cylinder.
• Connect up the gas cylinder only through a pressure reducing valve (1.5 bar max.).
• When not in use, close the shut-off valve.
• The instructions and safety information of the gas supplier have to be observed.