KNF LABOPORT Manual De Instrucciones página 81

Chemically-resistant Laboratory pump N820.18 / N840.18
Translation of Original Operating Instruction, KNF 317428-317425 02/23
4.2 Information on the Ex-designation
This KNF pump is designated with the following device desig-
nation in accordance with the latest explosion protection di-
rective. The designation is only valid for the pumping chamber
(area that comes into contact with the medium) of the pump:
Fig.1: Ex-designation of the pumps
Vacuum pumps of category "2/-G" are designed for transfer-
ring gases, vapors or mists for which it is to be expected that
an explosive atmosphere forms occasionally.
The devices are to be arranged so that they cannot be me-
chanically damaged from the outside.
No changes may be made to the pumps. After replacing a
wear part, the original function of the pump must be tested by
achieving the specified ultimate vacuum (see operating in-
structions, Chapter 10 Servicing [} 42]).
Explosion protection
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