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1.2
Tools and Materials
Water-based or mineral spirits based antifouling paint (mandatory in salt water)
Safety goggles
Dust mask
Electric drill with 10mm (3/8") or larger chuck capacity
Drill bit 3mm or 1/8"
Hole saw 51mm or 2" (plastic or bronze housing)
57mm or 2-1/4" (stainless steel housing in a metal hull)
Countersink tool (installing a flush housing)
Sandpaper
Mild household detergent or weak solvent (such as alcohol)
File (installation in a metal hull)
Marine sealant
Additional washer [for aluminum hull less than 6mm (1/4") thick]
Zip-ties
Installation in a cored fiberglass hull (see page 3)
Hole saw for hull interior 60mm or 2-3/8"
Fiberglass cloth and resin or Cylinder, wax, tape, and casting epoxy
1.3
Pre-Installation Test
Connect the sensor to the instrument and spin the paddlewheel. Check for a speed
reading (and the approximate air temperature if applicable). If there is no reading or it
is inaccurate, return the instrument to the place of purchase.
1.4
Antifouling Paint
Marine growth can accumulate rapidly on the sensor's surface reducing performance
within weeks. Surfaces exposed to salt water must be coated with antifouling paint.
Use water-based or mineral spirits based antifouling paint only. Never use ketone
based paint, since ketones can attack many plastics possibly damaging the sensor. It
is easiest to apply antifouling paint before installing the sensor, but allow sufficient
drying time. Reapply paint every 6 months or at the beginning of each boating season.
Paint the following surfaces (see Figure 1):
Outside wall of the paddlewheel insert below the lower O-ring
Paddlewheel cavity
Paddlewheel
Exterior lip of the housing and valve assembly
Bore of the valve assembly up 30mm (1-1/4")
Blanking plug below the lower O-ring including the exposed end
1.5
Mounting Location
Turbulence-free water must flow over the paddlewheel at all speeds. Choose an
accessible spot inside the vessel. Allow a minimum of 280mm (11") of headroom for
the height of the housing, tightening the nuts, and removing the insert.
4
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