SP 250 ATEX Category 3i (inside) Vacuum Pump
Classification and Marking of the Pump
The SP 250 ATEX Category 3i (inside) fulfils for the inside, i.e. the process
gas side of the pump, the fundamental safety requirements of the EC
Directive 94/9/EG. The pump is marked as follows:
II (inside) 3GD II T160 °C X (10 °C < Ta < 40 °C)
These pumps are not suited for placement (installation) in explosion hazard
areas.
Key to the Symbols
II Equipment group II applies to all equipment in areas which are potentially
endangered by an atmosphere capable of exploding, except in under-
ground mining operations and their above ground facilities which may be
endangered by mine gas and/or combustible types of dust.
(inside)/(outside)
Specifies the category/conditions according to which the inside (i) (i.e.
parts of the equipment in contact with the process gas flow) and the out-
side (o) of the equipment are classified, provided there is a difference bet-
ween them.
3 Category 3 comprises equipment which is so designed that it can be ope-
rated in agreement with the characteristic quantities (operating parameters)
specified by the manufacturer ensuring a normal degree of protection.
Equipment belonging to this category is intended for operation in areas
where it not needs to be expected that an explosive atmosphere occurs
due to gases, vapours, mists or raising dust, but when it occurs, then with
all probability only rarely and briefly.
Equipment belonging to this category ensures during normal operation the
necessary degree of safety.
G For areas with an atmosphere capable of exploding caused by gases,
vapours or mists in the air.
D For areas with an atmosphere capable of exploding caused by explosive
dusts.
II, IIA, IIB or IIC
Explosion groups: these are subdivisions for equipment belonging to Group
II, which are used in connection with some protection types. This subdivisi-
on is based on the maximum experimental safe gap and the minimum igni-
tion current of the explosive atmosphere. See EN 60079-0.).
Equipment marked with IIB is also suited for applications which require
equipment marked with IIA.
Equipment marked with IIC is also suited for applications which require
equipment belonging to explosion group IIA or IIB.
Equipment without indication of the explosion group may be used in explo-
sive atmospheres of explosion groups IIA, IIB and IIC.
For Part Number 115 003
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