Watson-Marlow SP Series - Manual (Page 24)

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• Refit the inspection window. Check the gasket for damage and replace if necessary.
Make sure that all bolts are refitted and that they are tightened in the correct order,
diagonally opposite each other, see “Specifications”: “Torques”, § 10.1.6.
• Switch on the electrical supply.
7.9 Fitting options
7.9.1 Fitting a high-level float switch
• Note: in case of series SP/10, SP/15 and SP/20 another type of cover is required.
• Dismount the standard breather on the cover of the pump
• Slide the standard breather cap from breather.
• Replace the standard breather cap with the breather cap with high level float switch
and slide it over breather.
• Mount the breather on the cover of the pump.
• Connect the high-level float switch to the electrical supply. Bear in mind that the
electrical contact of the float switch is normally closed (NC). When the lubricant level
is (too) high the contact will open.
7.9.2 Fitting a low level float switch (not applicable for SP/10, SP/15 and SP/20)
• If the pump is filled with lubricant this must be removed first. Place a tray under the drain
plug in the desaeration pipe on the cover of the pump. Remove the drain plug. Catch
the lubricant from the pump housing in the tray.
• Replace the drain plug by a low level floater.
• Connect the low level float switch to the electrical supply. Bear in mind that the
electrical contact of the float switch is normally closed (NC). This means that: the
contact of the low level float switch opens at a (too) low lubricant level.
• Make sure the lubricant returns to the prescribed level, see: “Maintenance”:
“Changing lubricant”, § 7.3.