Airmar ST800 Owner's Manual And Installation Instructions
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Thru-Hull, Retractable with Valve
Speed & Temperature Sensor
Model ST800
Applications
• Plastic housing recommended for fiberglass or metal hull only.
Never install a plastic housing in a wood hull because swelling
of the wood can possibly fracture the plastic.
• Bronze housing recommended for fiberglass or wood hull.
Never mount a bronze housing in an aluminum 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. If
there are no readings or they are inaccurate, check all the
connections and try again. If there is still a problem, return the
product to the place of purchase.
Tools & Materials
Safety goggles
Dust mask
Ear plugs
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
Mild household detergent or weak solvent (such as alcohol)
File (installation in a metal hull)
Marine sealant (suitable for below waterline)
Additional washer [for aluminum hull less than 6mm (1/4") thick]
Slip-joint pliers (installing a bronze 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
Turbulence-free water must flow over the paddlewheel at all boat
speeds. Choose an accessible spot inside the vessel. Allow a
minimum of 280mm (11") of space for the height of the housing,
tightening the nuts, and removing the insert.
CAUTION: Do not mount the sensor directly ahead of a depth
transducer, because turbulence generated by the paddlewheel’s
rotation will adversely affect the depth transducer’s performance,
especially at high speeds. Mount side by side.
Record the information found on the cable tag for future reference.
Part No._________________Date______________
Follow the precautions below for optimal
product performance and to reduce the risk of
property damage, personal injury, and death.
WARNING: Always wear safety goggles, a dust
mask, and ear plugs 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: Plastic housing—Never use a fairing
with a plastic housing. The protruding sensor would
be vulnerable to damage from impact.
CAUTION: Bronze housing—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 to align the paddlewheel
with the water flow.
CAUTION: Never use solvents. Cleaners, fuel,
sealant, paint, and other products may contain
solvents that can damage plastic parts.
IMPORTANT: Please read the instructions
completely before proceeding with the installation.
These instructions supersede any other instructions
in your instrument manual if they differ.
low profile
P120 housing
plastic
OWNER’S GUIDE & INSTALLATION INSTRUCTIONS