Use
Diaphragm pump N680 EX
8
Translation of Original Operation and Installation Instruction, english, KNF 325438 02/22
2.4 Explanations of the explosion protection designation
2.4.1 Device groups
Device group I Device group I applies for devices that are used in underground plants of
mines as well as their underground systems that could be endangered by
methane and/or combustible dusts.
Device group II Device group II applies for devices that are used in other areas that could
be endangered by an explosive atmosphere.
2.4.2 Device categories for gas
The device category describes the frequency and the duration of the oc-
currence of explosive atmospheres during operation.
Device cat-
egory
Description
1G
Devices of this category are designed for use in areas in
which an explosive atmosphere consisting of a mixture of air
and gases, vapors or mists is present constantly or for long
periods of time or often.
1D
Devices of this category are designed for use in areas in
which an explosive atmosphere consisting of a dust/air mix-
ture is present constantly or for long periods of time or often.
2G
Devices of this category are designed for use in areas in
which it is to be expected that an explosive atmosphere con-
sisting of gases, vapors or mists forms occasionally.
2/2G
Devices that extract from zone 1 and are designed for use in
areas in which it is to be expected that an explosive atmos-
phere consisting of gases, vapors or mists forms occasion-
ally.
2/-G
Devices that extract from zone 1 but are not designed for in-
stallation in a potentially explosive atmosphere (zone).
2D
Devices of this category are designed for use in areas in
which it is to be expected that an explosive atmosphere con-
sisting of a dust/air mixture forms occasionally.
3G
Devices of this category are designed for uses in areas in
which it is to be expected that an explosive atmosphere re-
sulting from gases, vapors or mists occurs, though in all like-
lihood occurs only seldom and for a very short length of time.
3/-G
Devices that extract from zone 2 but are not designed for in-
stallation in a potentially explosive atmosphere (zone).
3D
Devices of this category are designed for uses in areas in
which it is to be expected that an explosive atmosphere re-
sulting from stirred-up dust occurs, though in all likelihood
occurs only seldom and for a very short length of time.
Tab.4
