Eagle Electronics SeaFinder 480DF - Manual (Page 28)

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If a second temp sensor is used, it must be the model TS-2U. This
model has a fixed electronic "address" which designates it as the second
of two temp sensors. Dual temperatures are only displayed on the Full
Chart page. The Large Digital page will only display the primary
temperature sensor. See the following wiring diagram for temperature
and speed sensor combinations.
Sonar unit with secondary external temperature sensor.
Sonar unit with external speed sensor or combo speed/temp sensor.
The primary temperature sensor is built into the transducer.
Power/trans-
ducer cable. Temp sensor built
into transducer.
SP-U speed sensor
or combo speed/
temp sensor.
Sonar unit
rear view
Sonar unit
rear view
T2-U temp sensor
Temp sensor built
into transducer. Power/trans-
ducer cable