Routine Checks; Hazardous Area - General; Area Classification - Thermo Scientific Prima PRO User Manual

Hazardous Area Operation
Hazardous Area – General

Routine Checks

Hazardous
General
Classification
A-4 Prima PRO & Sentinel PRO Mass Spectrometers User Guide
When replacing any Thermo Scientific manufactured electrical

assembly, ensure that the replacement assembly is of an issue
level greater than or equal to the original.
When discussing spares, upgrades, etc. with the factory, make it

clear that this is a hazardous area (Ex) system.
Verify correct operation of the purge control equipment on a six

monthly basis (see
Inspect and / or test the sample containment system on a six

monthly basis (see
Check correct operation of the RMS heater on a routine basis

(see "Temperature").
Area –
This section gives a brief outline of the general principles of
hazardous areas and operation of equipment in these areas, with
comparison between European and North American terminology.
Only hazards due to flammable gases and vapours will be
considered. The presence of dusts and fibres may also cause an area
to be defined as hazardous but will not be considered as the
Prima PRO Ex and Sentinel PRO Ex are not approved for operation
in such areas.
Area
Area classification specifies the probability of a hazard being present
in a defined physical area. Under ATEX (Europe) and IECEx
regulations, equipment is categorised based on the level of protection
offered. Particular categories of equipment are allowed in particular
areas. The areas and categories are summarized in
Table A–1. Areas and equipment categories
Hazard Type*
Continuous or nearly
continuous hazard
Intermittent hazard
Hazard only in fault
conditions
*Refer to the appropriate standard for exact definition.
"Purge Operation and
"Inspection and
Testing").
ATEX (Europe) and IECEx
Allowed
Area Equipment
Category
Zone 0 1
Zone 1 1 and 2
Zone 2 1, 2 and 3
Testing").
Table A–1.
North
American
Area
Division 1
Division 2
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