Use
Diaphragm pump N87.9 EX
8
Translation of Original Operation and Installation Instruction, english, KNF 323252 04/21
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.
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
