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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 glasses, a dust mask, 

and ear protection when installing.

WARNING

: When the boat is placed in the water, 

immediately check for leaks around the screws and 

any other holes drilled in the hull.

CAUTION

P48W

Operate at 200kHz only

Operating at any other frequency will permanently 

damage the transducer and/or the echosounder.

CAUTION

TM150M

 

CHIRP transducer

—Always 

operate the transducer in water. Operating in air will 

allow the transducer to overheat resulting in failure.

CAUTION

: The bracket protects the sensor from 

frontal impact only.

CAUTION

: Never pull, carry, or hold the transducer by 

its cable; this may sever internal connections.

CAUTION

: Never strike the transducer with anything 

except the palm of the hand to release it.

CAUTION

: Never use solvents. Cleaner, fuel, sealant, 

paint and other products may contain solvents that can 

damage plastic parts, especially the transducer’s face.

IMPORTANT

:

 Read the instructions completely 

before proceeding with the installation. These 

instructions supersede any other instructions in your 

instrument manual if they differ.

17

-4

99

-0

2-

re

v.0

2

06

/30

/16

Transom 

or Optional

 Trolling-motor Mount

CHIRP 

or

 Adjustable Wide-beam Transducer

Models: 

P48W, TM150M

U.S. Patents 7,369,458; 7,961,522; 8,582,393. UK 2 414 077

Applications

• Recommended for boat up to 7m (22’) long
• Not recommended for boats with large inboard engine(s)

P48W

—Not recommended for stepped transoms because the 

transducer will be difficult to adjust.

• Vertically orients sound beam on hull with deadrise angle up to 22°
• Adjusts to transom angles from 2

°

 – 22

°

• Requires 89mm (3-1/2") of headroom to install
• Release bracket protects sensor from frontal impact only

P48W

—Trolling Motor Kit adapts transducer for use with a 

trolling motor or optional Portable Bracket

Record the information found on the cable tag for future reference.

Part No._________________Date___________Frequency________kHz

INSTALLATION INSTRUCTIONS

OWNER’S GUIDE      &

TM150M

P48W

Tools & Materials

Safety glasses
Dust mask
Ear protection
Phillips screwdrivers
Pencil
Electric drill
Drill bits:

Bracket holes

4mm, #23, 

or

 9/64"

Transom hole (optional)

18mm, 11/16", 

or

 3/4"

24 mm or 15/16" or 1" 

(Raymarine only)

Cable clamp holes

3mm 

or

 1/8"

Masking tape
Angle finder (some installations)
Marine sealant (suitable for below waterline)
Straight edge
Grommet(s) (some installations)
Cable ties (some installations)
Band clamp

 (trolling motor mount) Measure before purchasing (Figure 8)

Water-based anti-fouling paint (

mandatory in salt water

)

Transom Mount

Attaching the Bracket to the Transom Housing

1. Insert the transom housing’s pivot posts into the recesses on the 

sides of the bracket (see Figure 1).

2. Press the two nuts into the slots in the back of the bracket.
3. Align the holes in the transom housing, bracket, and nuts. Insert 

the two machine screws capturing the nuts. Tighten the machine 
screws until the housing will stay in the “up” (released) position 
unaided.

Figure 1. Attaching the bracket to the transducer

pivot post (2)

recess (2)

bracket

nuts

machine

screw (2)

slot (2)

Copyright © 2008 - 2015 Airmar Technology Corp.

transom

housing

Summary of Contents for P48W

Page 1: ... s P48W Not recommended for stepped transoms because the transducer will be difficult to adjust Vertically orients sound beam on hull with deadrise angle up to 22 Adjusts to transom angles from 2 22 Requires 89mm 3 1 2 of headroom to install Release bracket protects sensor from frontal impact only P48W Trolling Motor Kit adapts transducer for use with a trolling motor or optional Portable Bracket ...

Page 2: ...at may be supported during trailering launching hauling or storage For the best performance the transducer s face must be in contact with smooth water To identify an area of clean water observe the water flow off the transom while the boat is underway Allow headroom space above the bracket for it to release and rotate the sensor upward Mount the sensor as close to the centerline keel of the boat a...

Page 3: ...e the waterline 1 If a hole must be drilled through the transom choose a location well above the waterline see Figure 3 Check for obstructions such as trim tabs pumps or wiring inside the hull Mark the location with a pencil Drill a hole using the appropriate size bit to accommodate the connector 2 Route the cable over or through the transom 3 On the outside of the hull secure the cable against th...

Page 4: ...ectrical wiring and the engine s Coil any excess cable and secure it in place with cable ties to prevent damage 10 Refer to your echosounder owner s manual to connect the sensor to the instrument Checking for Leaks When the boat is placed in the water immediately check for leaks around the screws and any other holes drilled in the hull Note that very small leaks may not be readily observed Do not ...

Page 5: ... size beam width in both directions 90 12 38 Maximum detection while boat is moving forward Good high speed bottom detection Fish arches are not pronounced or may not be evident Transom Mount Adjusting the Beam NOTE The knob corresponds to the shape and position of the transducer s beam To change the beam s orientation relative to the boat grasp the transducer s knob push down rotate to the desire...

Page 6: ... with sealant 3 Cover the damaged area with electrical tape Severed Cable 1 Slide heat shrink tubing onto the cable 2 Splice each pair of matching colored conductors with rosin core solder 3 Wrap each conductor with insulating tape at the splice 4 Splice the braided shield wire with solder 5 Fill the spliced area in the cable with sealant 6 Cover the damaged area with the heat shrink tubing follow...

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