6. Appendix - Table 3, from DIN-Standard 12 880
Safety devices against malfunction of the temperature control circuit.
Classification of heating ovens according to DIN-Standard 12 880 Part 1, table 3.
The class describes the type and scope of protection, as well as the safety measures
required to deal with a simple defect in the temperature control circuit.
Class
0
1
2
3
3.1
3.2
3.3
Purpose
-
Protection
of oven
Protection
of oven,
environment
and mate-
rial being
treated.
Scope
-
In
the
event
of a
defect,
no
danger
emanates from
the
oven.
In
the
event
of a
defect,
no
danger
emanates from
the
oven
or
from
the ma-
terial being treated.
In
the
event
of a
defect,
the
material
being treated
is
pro-
tected against over-
heating and/or under-
cooling (e.g. incuba-
tor)
Safety device
ace.
to
Sub-
section
5.5
-
Temperature
11 miter
or
thermal fuse
Adjustable
temperature
limit cut-out
Adjustable
temperature
limit
con-
troller,
coming into
action
in
case
of:
excess
temperature
Insufficient
temperature
excess
temperature
and
insufficent
temperature
Safety measures
Only attended opera-
tion*) with harmless
materials
1s
permit-
ted;
or
overheating
is excluded
by
con-
structional measures.
Special safety meas-
ures depending
on
the intended
use.
*) If operation is supervised, the oven must be checked at reasonably short intervals to
make sure it works correctly.
WPPAP1/ID 368
50012336
-25-
To Next Page
Loading...
