Airmar ST800 Owner's Manual & 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 since 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.
• Stainless steel housing compatible with all hull materials.
Recommended for aluminum hulls to prevent electrolytic corrosion
provided the stainless steel housing is isolated from the metal hull.
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" (plastic or metal housing in non-metal hull)
57mm or 2-1/4" (stainless steel housing in metal hull)
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 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
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 headroom for the height of the
housing, tightening the nuts, and removing the insert.
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.
Record the information found on the cable tag for future reference.
Part No._________________Date___________
INSTALLATION INSTRUCTIONS
OWNER’S GUIDE &
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.
WARNING: Stainless steel housing in a metal hull—
Be sure the washer contacts the hull. Do not tighten
the hull nut with the washer against the isolation
bushing, as the housing will not be firmly installed.
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: A stainless steel housing must be isolated
from a metal hull to prevent electrolytic corrosion. Use
the isolation busing supplied.
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.
low profile
P120 housing
plastic
ST800
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 the connections and try again. If
there is still a problem, return the product to the place of purchase.