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INSIDE THE HULL MOUNTED TRANSDUCER
Installation Guide
2. Proceed to Install the Temp Probe (if applicable) or Set up the Transducer on the Control
Head.
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| Install the Temperature Probe (If Applicable)
The Temperature Probe incorporates a temperature-sensitive probe in a high impact plastic
housing. The probe is intended for installation on the transom and will work well on almost any boat.
NOTE: The temperature probe is only available on certain models. Contact Humminbird Technical
Support for details.
Supplies: In addition to the parts supplied, you will need a hand drill with various size bits, marine-
grade silicone sealant, and various hand tools.
Temperature Probe Mounting Location: Locate an area on the transom of your boat 6" to 8" or
farther from the transducer(s). This area must stay in contact with the water at high speeds. Do
not mount the sensor directly in front of the propeller or outdrive, and make sure that there are no
protrusions such as ribs, rows of rivets, or transducers directly forward of the mounting location, as
these may affect the flow of water over the temperature probe.
1. Either route the cable from the in-hull mounted transducer over the top of the transom, or drill
a 5/8" hole in the transom directly above the sensor, above the waterline.
CAUTION! The temperature probe incorporates a temperature-sensitive probe in a high-
impact plastic housing with 10 feet of cable. Do not cut or shorten the temperature probe
cable, and try not to damage the cable insulation. The probe is intended for installation on
the transom and will work well on almost any boat.
2. Assemble the sensor in the clamp, and align it on the transom so the lower edge of the
temperature probe sensor is flush with the hull of the boat, and so that it doesn't extend below
the hull. Mark the hole location.
3. Drill a 1/8" mounting hole approximately 3/4" deep.
NOTE FOR FIBERGLASS HULLS: It is best to start with a smaller bit and use progressively
larger drill bits to reduce the chance of chipping or flaking the outer fiberglass coating.
4. Seal the mounting hole with marine-grade silicone sealant, and attach the sensor to the
transom using the provided screw.
5. If a thru-hole is used, an escutcheon plate is included to dress the hole. Place the escutcheon
plate over the cable hole and use it as a guide to mark the two escutcheon plate mounting
holes. Remove the plate, drill two 9/64" diameter x 5/8" deep holes, then fill all holes with
marine-grade silicone sealant. Place the escutcheon plate over the cable hole and attach it
with two #8 x 5/8" wood screws.
6. Route and secure the cable by attaching the supplied cable clamps to the transom. Drill one
9/64" diameter x 5/8" deep hole for each cable clamp. Fill the hole with marine-grade silicone
sealant, and attach the cable clamp to the transom using a #8 x 5/8" screw.
7. If the connection is correct, the Humminbird unit will begin displaying water temperature
immediately. If the gauge fails to read at high speeds, adjust the height of the sensor on the
transom of your boat.
8. After final high-speed adjustments have been made, if a thru-hull hole was used, seal the hole
with marine-grade silicone sealant.
NOTE: The cabling from your transducer should already be routed from its location to the control
head. The cabling from the temperature probe goes into the transducer module and its readings
are transferred through the same cable to the control head. Refer to your control head installation
guide for more information about the quick disconnect or connector collector included with your
control head.
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530509-8_A
In-Hull Transducer with
External Temperature Probe
Routing the Temp Probe Cable
escutcheon
plate
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