Pfeiffer Vacuum HISCROLL 12, Operating Instructions Manual

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Classification Description
Device group Devices which can be used for applications in potentially explosive atmospheres
are divided into two groups:
Device group I : Devices for mines susceptible to firedamp (will not be discussed
in any more detail here)
Device group II : Devices for all other potentially explosive areas with the excep-
tion of underground operations in mines and their surface installations which are
susceptible to hazardous firedamp and / or combustible dust.
Device category Device group II is divided into three categories which vary in their respective de-
gree of safety.
Devices of
Device category 1 are designed to guarantee an extremely high de-
gree of safety. They must guarantee the necessary degree of safety even if mal-
functions occur only rarely on the device.
Devices of
Device category 2 are designed to guarantee a high degree of safe-
ty. They must guarantee the necessary degree of safety even with regular occur-
rences of malfunctions or fault conditions which are generally to be expected.
Devices of
Device category 3 are designed to guarantee a normal degree of
safety. They guarantee the necessary degree of safety for normal operation.
Combustible ma-
terials
G : Gases or vapors
D : Dust (will not be discussed in any more detail here)
Type of protec-
tion
Identification code “Ex h” designated in the standard DIN EN ISO 80079-36 for
non-electrical equipment. A protection type established for electrical equipment is
not used.
Explosion groups Gases and vapors are divided into three Explosion groups based on their particu-
lar ignition capability (IIA, IIB and IIC). The ignition power in this regard decreas-
es from Explosion group IIA to IIC. (The higher Explosion group, e.g. IIC incorpo-
rates the respectively lower IIB and IIA).
Temperature
class
Classification of equipment depending on their maximum surface temperature, in
accordance with assignment as follows:
Temperature class --> Maximum surface temperature/gas temperature:
● T1 --> +450 °C
● T2 --> +300 °C
● T3 --> +200 °C
● T4 --> +135 °C
● T5 --> +100 °C
● T6 --> +85 °C
The temperature class and the actual maximum surface temperature of the
equipment includes a safety margin to the minimum ignition temperature of the
potentially explosive atmospheres as stipulated in DIN EN ISO 80079-36.
EPL according to
DIN EN 60079
Equipment protection level
EPL Ga : Equipment with “extremely high” protection level for use in potentially
explosive gas atmospheres in which no risk of ignition exists during normal oper-
ation, with foreseeable or infrequent faults/malfunctions.
EPL Gb : Equipment with “high” protection level for use in potentially explosive
gas atmospheres in which no risk of ignition exists during normal operation, with
foreseeable faults/malfunctions.
EPL Gc : Equipment with “extended” protection level for use in potentially explo-
sive gas atmospheres in which no risk of ignition exists during normal operation.
X Special operating conditions apply that must be observed when pumping in an
explosive atmosphere. These include:
● The limits of use of the product shown in chapter 2.5.
● The prohibition of using accessories (e.g., pressure sensor) without ATEX
approval.
Ta Permissible ambient temperature for operation of the vacuum pump prescribed
on the rating plate.
Tbl. 3: General ATEX designations
Safety
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