KNF LABOPORT N820.18 EX Instrucciones De Funcionamiento Originales página 73

Chemically-resistant Laboratory pump N820.18 EX / N840.18 EX
Maximum sur-
face temperature
Ignition tempera-
ture
Temperature
class
Temperature
class
T1
T2
T3
T4
T5
T6
Designation
h
h
h
Translation of Original Operating Instruction, KNF 317428-317425 05/21
3.4.4 Temperature classes
The maximum surface temperature is the highest temperature
that is reached under the most unfavorable conditions of a
surface of the pump.
The maximum surface temperature of the pump must always
be lower than the lowest ignition temperature of the gas or va-
por/air mixture in which it is used.
The maximum surface temperature arises from the design of
the pump and is specified as temperature class.
Max. surface temperature [°C] Ignition temperature
450
300
200
135
100
85
Tab.6:
3.4.5 Ignition protection type
Description
Constructional safety "c"
Ignition source monitoring "b"
Liquid immersion "k"
Tab.7:
An ignition hazard assessment in accordance with standards
DIN EN ISO 80079-36 and DIN EN ISO 80079-37 was per-
formed for the pumps. The protective goals were reached by
applying ignition protection type constructional safety "c".
[°C]
> 450
> 300
> 200
> 135
> 100
> 85
Use
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