5 PB0347:m-620atex-en-03
3 Pumphead types
The following 600 seriespumpheads are covered by this manual:
620RA ATEX Pumpheads
620RA* 064.0211.A00 Two rollers for max 2 bar. Continuous tubing only
620REA* 064.0231.A00 Two rollers for max 4 bar. LoadSure tubing elementsonly
620RE4A* 064.0431.A00 Four rollers for max 4 bar. LoadSure tubing elementsonly
* NB: these pumpheads are compatible with a number of Watson-Marlow cased drives. However, the
Watson-Marlow cased drivesare not ATEXcompliant and must not be used in hazardous locations.
Any 600 series pumpheads not listed here are NOT suitable for use in hazardous
environments (at date of issue).
3.1 Pumphead description
The pumpheads use the peristaltic principle by employing either 2 or 4 occluding rollers assembled as a
rotor, which occludes a specially designed tube and provides fluid flow by positive displacement as it
rotates.
The pumphead is largely of coated metal construction with metal shafts for the occluding and following
rollers. The rotor body is moulded from a conductive nylon compound. The rotation of the occluding
rollers isallowed using roller bearings. Materialsof construction are detailed in thismanual.
The pumphead is designed to be direct mounted or close coupled onto a suitable motor gearbox using
the instructions detailed in thismanual.
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