ATEX Directive: Watson-Marlow 800 series pumps and pumpheads User Manual
2
2. Pump models
800 series ATEX pumps and pumpheads are quoted on application by Watson-
Marlow’s applications engineering department. Part codes may vary depending on
the final build specification and the customer.
Watson-Marlow
cased
drives are not ATEX-compliant and must not be used
in hazardous locations.
NB: where two or more items of ATEX equipment are combined, the complete
assembly shall carry the rating of the lowest ranking individual piece of equipment.
3. Hazardous environments
When used in accordance with the operating guidelines defined in this manual,
Watson-Marlow’s ATEX pumps are classified as Group II, Category 2 equipment for
gas-based environments, under the definitions of 94/9/EC:
“Group II, Category 2 products should be designed to be capable of remaining within
their operational parameters, as stated in the instruction manual, and based on a
high level of protection for their intended use, in areas in which explosive
atmospheres caused by mixtures of air and gases, vapours, mists or air/dust mixtures
are likely to occur.”
Watson-Marlow’s ATEX pumps are rated for use in gas-based atmospheres
only, and must not be used in hazardous dust environments.
94/9/EC also states, “The explosion protection relating to this category must function
in such a way as to provide a sufficient level of safety even in the event of equipment
with operating faults or in dangerous operating conditions which normally have to be
taken into account”.
Watson-Marlow’s ATEX pumps have been designed to cope with potential
ignition sources during normal operation and following expected
malfunctions. EN standards have been used to apply ignition-protection
concepts to prevent potential ignition sources becoming effective.
The Equipment Group II rating means Watson-Marlow pumps must not be
used in the underground parts of mines, and in surface installations of such
mines, likely to become endangered by firedamp and/or combustible dust.
For further information on the correlation between ATEX zones and ATEX equipment,
please refer to the Workplace Directive (1999/92/EC).