KNF LABOPORT N820.18 EX Operating Instructions Manual page 76

Chemically-resistant Laboratory pump N820.18 EX / N840.18
Information on the Ex-designation
EX
4 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 compression
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 11 Servicing [} 37]).
Translation of Original Operating Instruction, KNF 317428-317425 05/21
16