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ATEX Instruction Manual
HAS8xE-IM-ATEX
January 2004
MLT 2 / BINOS
100 F
Emerson Process Management Manufacturing GmbH & Co. OHG
P - 5
Terms used in this manual
Dilution
The continuous supply of a protective gas,
after purging, at such a rate that the
concentration of a flammable mixture inside
the pressurized enclosure is maintained at
a value outside the explosive limits except
in a dilution area.
Pre-Purging
The pre-purging phase serves to remove any
combustible gas out of the analyzer’s
enclosure prior to switching on the analyzer.
During this time the housing is purged with
5 times its own volume.
Flammable Gas(es)
Gases and gas mixtures are assigned to be
flammable if they might become ignitable
when in a mixture with air.
Pressurization mode „Leakage
Compensation“
In EEx p „leakage compensation mode“ just
as much protective gas is used to hold an
overpressure of > 1 mbar compared to
atmospheric.
Pressurization mode „Continuous
Flow“
In EEx p „continuous flow mode“ the
protective gas flows with higher rates
through the enclosure. Flow rates are
calculated to hold an overpressure of > 1
mbar compared to atmospheric.
Protective Gas
Air or inert gas used for purging and
maintaining an overpressure and, if
required, dilution.
Pressurization Modes
Explosive Gas(es)
Gases and gas mixtures are assigned to be
explosive if they consist of a flammable gas
in a mixture with air and the concentration is
inbetween the explosive limits.