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2
DEFINITIONS AND SYMBOLS
Key terms are defined below, and symbols are included in Table 2
IOMI – Installation, operation and maintenance instructions
Filter Housing - Vessel or container for filter cartridges or elements operating greater than atmospheric pressure
(pressure envelope)
Vessel - a housing designed and built to contain fluids under pressure including its direct attachments up to the
coupling point connecting it to other equipment; a vessel may be composed of more than one chamber.
Filter Cartridge - Filter element installed inside the 'housing' with a sealing feature
Fluid - gases, liquids and vapours in pure phase as well as mixtures thereof; fluids may contain a suspension of
solids.
PED - Pressure Equipment Directive 2014/68/EU
ATEX - Explosive Atmospheres Directive 2014/34/EU
PPE - Personal Protective Equipment
Relaxation time - Time during which the electrostatic charge on a sold or in the bulk of a liquid or powder decays
exponentially to 1/e (i.e. about 37%) of its original value.
Equipment - Machines, apparatus, fixed or mobile devices, control components and instrumentation thereof
and detection or prevention systems which, separately or jointly, are intended for the generation, transfer,
storage, measurement, control and conversion of energy and/or the processing of material and which can cause
an explosion through their own potential sources of ignition.
Explosive atmosphere - A mixture with air, under atmospheric conditions, of flammable substances in the form
of gases, vapours, mists or dusts in which, after ignition has occurred, combustion spreads to the entire
unburned mixture
Potentially explosive atmosphere - An atmosphere which could become explosive due to local and operational
conditions.
Equipment category - The classification of equipment, within each equipment-group, specified in Annex I,
determining the requisite level of protection to be ensured.
Protective systems - Devices other than components of equipment which are intended to halt incipient
explosions immediately and/or to limit the effective range of an explosion and which are separately made
available on the market for use as autonomous systems.
General prohibition - instructs
when certain behaviours or
actions are not allowed
Mandatory signs – instructs that
a course of action must be
undertaken
Warning signs - used to identify
potential hazards
Table 2
.
CE Conformity Mark
Ex Mark
179560600 Rev1
Page 4 of 21
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