Memmert Universal ovens U, Incubators I, Sterilisers S - Manual (Page 11)

D24022 | Date 10/2014 11
Setup and description
2.2 Function
Appliances of the UN, SN and
IN type series feature
natural circulation (convec-
tion). For the UF, SF and IF
type series, air is circulated
by a fan at the working
chamber rear panel Fig. 3 ,
No. 1). It increases the air
flow and provides stronger
horizontal forced air
circulation than natural
convection.
In both the convection and
fan ventilated appliances,
supply air (2) is preheated
in a pre-heating chamber
(3). Through the ventilation
slits in the side panel of the
working chamber, the pre-
heated air is introduced into
the interior of the chamber.
The supply and exhaust air
(5) volume (air change) is
controlled by the air flap
(4) on the rear panel of the
appliance.
2.3 Material
For the outer housing, MEMMERT deploys stainless steel (Mat.No. 1.4016 – ASTM 430) and
for the interior, stainless steel (Mat.No. 1.4301 – ASTM 304) is used, which stands out through
its high stability, optimal hygienic properties and corrosion-resistance towards many (but not
all!) chemical compounds (caution for example with chlorine compounds).
The chamber load for the appliance must be carefully checked for chemical compatibility with
the materials mentioned. A material resistance table can be requested from the manufacturer.
2.4 Electrical equipment
►
Operating voltage and current consumption: See nameplate
►
Protection class I, i.e. operating insulation with PE conductor in accordance with EN 61010
►
Protection type IP 20 acc. to EN 60 529
►
Interference suppression acc. to EN 55011 class B
►
Appliance fuse: Fusible link 250 V/15 A quick-blow
►
The temperature controller is protected with a miniature fuse 100 mA (160 mA at 115 V)
Fig. 3 Function
1 Fan
2 Fresh air
3 Pre-heating chamber
4 Air flap
Pre-heating chamber Pre-heating chamber
5 Exhaust air
Air flap Air flap