Watson-Marlow 505LA - Manual (Page 5)

ATEX Directive: Watson-Marlow 505LA, 505LXA and 505LGA pumpheads User Manual 5
For each application it is strongly recommended that tube life should be determined
by trials, prior to installation in a hazardous environment. If this is not possible,
or if there is any doubt in terms of tube life then the following hazards should be
recognised before installing a pump in a potentially explosive atmosphere:
Chemical reaction between spilled pumped fluid and pump
materials - the materials of construction are listed in Section 9
Spilled, pumped fluid could be ignited by the surface temperature
of the rollers - Watson Marlow’s 505LA pumpheads have been rated
as T4 (meaning that even under worst-case operating conditions
the maximum surface temperature will not exceed 135C)
Factors influencing tube life
Normal tube fatigue - dependent on tube size, material and
pumphead speed
Incorrect tube loading - see 505L manual (m-505l-gb-01) for
guidance
Excess working pressure - see Section 4 Operating parameters
Chemical incompatibility - a table of tubing compatibility can be
found at
http://www.watson-marlow.co.uk/pdfs-global/chemcompat.pdf.
Immersion kits are available from Watson-Marlow for testing.
7 Tube life
Only Watson-Marlow tubing should be used to guarantee continued compliance with
the ATEX directive.
A number of factors contribute to the life of the tubing:
There is potential for the pumped fluid to become charged through pumping.
Protective measures should be implemented at the discharge outlet to dissipate this
charge safely.
The 505LA pumpheads should be run only with the track levers in the fully closed
position.