OWNER’S GUIDE & INSTALLATION INSTRUCTIONS
Thru-Hull, Retractable with Valve
Speed & Temperature Sensor
Model ST600
Record the information found on the cable tag for future reference.
Part No._________________Date___________
17-038-01 rev. 04 04/12/11
Follow the precautions below for optimal product performance and to reduce the risk of property damage, personal injury, and/or death.
WARNING: Always wear safety goggles and a dust mask when installing.
WARNING: The valve is not a watertight seal! Always use the insert or blanking plug secured with the safety wire for a watertight seal.
WARNING: The o-rings must be intact and well lubricated to make a watertight seal.
WARNING: Always attach the safety wire to prevent the insert or blanking plug from backing out in the unlikely event that the cap nut fails or is screwed on incorrectly.
WARNING: Immediately check for leaks when the boat is placed in the water. Do not leave the boat unchecked for more than three hours. Even a small leak may allow considerable water to accumulate.
CAUTION: Never use a fairing with a plastic housing; the protruding sensor would be vulnerable to damage from impact.
CAUTION: Never install a metal housing on a vessel with a positive ground system.
CAUTION: Never pull, carry, or hold the sensor by its cable; this may sever internal connections.
CAUTION: The arrow on the top of the insert must point forward toward the bow.
CAUTION: Never use solvents. Cleaners, fuel, sealants, paint, and other products may contain strong solvents, such as acetone, which attack many plastics, greatly reducing their strength.
IMPORTANT: Please read the instructions completely before proceeding with the installation. These instructions supersede any other instructions in your instrument manual if they differ.
Tools & Materials
Safety goggles Dust mask
Water-based anti-fouling paint (mandatory in salt water) Electric drill with 10mm (3/8") or larger chuck capacity
Drill bit: |
3mm or 1/8" |
Hole saw: |
51mm or 2" |
Sandpaper |
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Mild household detergent or weak solvent (alcohol) |
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File (installation in a metal hull) |
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Marine sealant (suitable for below waterline)
Additional washer [for aluminum hull less than 6mm (1/4") thick] Slip-joint pliers (installing a metal housing)
Grommet(s) (some installations) Cable 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
Mounting Location
CAUTION: Do not mount the sensor near water intake or discharge openings; behind strakes, fittings, or hull irregularities that will disturb the flow.
CAUTION: Never mount the sensor directly ahead of a depth transducer, since turbulence generated by the paddlewheel’s rotation will adversely affect the depth transducer’s performance, especially at high speeds. Mount side by side.
CAUTION: Do not mount in line with trailer rollers or bunks that may damage the transducer’s face.
Applications
•Plastic housing recommended for fiberglass or metal hull only.
Never install a plastic housing in a wood hull since swelling of the wood may fracture the plastic.
•Bronze housing recommended for wood or fiberglass hull only.
Never install a bronze housing in a metal hull because electrolytic corrosion will occur.
Pretest
Connect the sensor to the instrument and spin the paddlewheel. Check for a speed reading and the approximate air temperature (in appropriate). If there is no reading(s) or it is inaccurate, check the connections and try again. If there is still a problem, return the product to the place of purchase.
Turbulence-free water must flow under the paddlewheel at all speeds. Choose an accessible spot inside the vessel. Allow a minimum of 200mm (8") of headroom for the height of the housing, tightening the nuts, and removing the insert.
•Displacement hull powerboats—Locate amidships near the centerline.
•Planing hull powerboats—Mount well aft to ensure that it is in contact with the water at high speeds.
•Fin keel sailboats—Mount on or near the centerline and forward of the fin keel 300–600mm (1–2').
•Full keel sailboats—Locate amidships and away from the keel at the point of minimum deadrise.
paddlewheel
insert paddlewheel insert
outside wall |
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pull |
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below |
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ring |
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lowest o-ring |
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paddlewheel |
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cap |
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paddlewheel |
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nut |
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cavity |
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housing
exterior flange |
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of housing |
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bore of housing |
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up 30mm (1-1/4") |
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Figure 1. Anti-fouling paint |
Figure 2. Assembly |
Copyright © 2001 Airmar Technology Corp. |
Copyright © 2001 Airmar Technology Corp. |
Anti-fouling Paint
Aquatic growth can accumulate rapidly on the sensor’s surface reducing performance within weeks. Surfaces exposed to salt water must be coated with anti-fouling paint. Use water-based anti-fouling paint only. Never use ketone based anti-fouling paint, since ketones attack many plastics possibly damaging the sensor.
It is easier to apply anti-fouling paint before installation, 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 paddlewheel insert below lowest o-ring
•Paddlewheel cavity
•Paddlewheel
•Bore of housing up 30mm (1-1/4")
•Exterior flange of housing
•Blanking plug below lowest o-ring including the exposed end
Assembly
Slide the cap nut along the cable until it rests on the top of the paddlewheel insert. Attach the pull ring to the insert capturing the cap nut (see Figure 2). Similarly attach the pull ring to the blanking plug capturing the cap nut.
Installation
Hole Drilling
Cored fiberglass hull—Follow separate instructions on page 3.
1.Drill a 3mm or 1/8" pilot hole from inside the hull. If there is a rib, strut, or other hull irregularity near the selected mounting location, drill from the outside.
2.Using the 51mm or 2" hole saw, cut the hole perpendicular to the hull from outside.
3.Sand and clean the area around the hole, inside and outside, to ensure that the sealant will adhere properly to the hull. If there is any petroleum residue inside the hull, remove it with either mild household detergent or a weak solvent (alcohol) before sanding. Metal hull—Remove all burrs with a file and sandpaper.
Bedding
CAUTION: Be sure the surfaces to be bedded are clean and dry.
Apply a 2mm (1/16") thick layer of marine sealant around the flange of the housing that contacts the hull and up the sidewall of the housing (see Figure 3). The sealant must extend 6mm (1/4") higher than the combined thickness of the hull, washer, and hull nut. This will ensure there is sealant in the threads to seal the hull and to hold the hull nut securely in place.
Installing
1.From outside the hull, push the housing into the mounting hole using a twisting motion to squeeze out excess sealant (see Figure 3). Align the arrow on the flange of the housing to point forward toward the bow. If the sensor is not installed on the centerline of the boat, angle the housing slightly toward the centerline to align it with the water flow.
2.From inside the hull, slide the washer onto the housing.
Aluminum hulls less than 6mm (1/4") thick—Use an additional rubbery, plastic, or fiberglass washer. Never use a wood backing block, since swelling of the wood can overstress the plastic housing causing a fracture. Never use bronze since electrolytic corrosion will occur.
3.Screw the hull nut in place being sure the notch on the upper rim of the housing and the arrow on the flange are still positioned forward toward the bow (see Figure 7).
Plastic housing—Do not clamp tightly on the wrenching flats, causing the housing to fracture.
Plastic hull nut—Hand-tighten only. Do not over tighten.
Metal hull nut—Tighten the hull nut with slip-joint pliers.
plastic housing |
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metal housing |
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pull ring |
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paddlewheel |
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paddlewheel |
insert |
safety wire |
insert |
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cap nut |
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(plastic) |
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hull nut |
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washer |
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marine |
hull |
marine |
sealant |
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sealant |
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Figure 3. Bedding and installing |
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Copyright © 2001 Airmar Technology Corp. |
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