MT01

The MT01 Transom/In-Hull Transducer is suitable for installation and operation on most boats. For optimal performance the transducer should be mounted to the transom of the boat as per the installation instructions. On fiberglass hulls (non-cored) and some aluminum hulls it can be glued to the inside of the hull, but this type of installation will reduce the performance of the depth sounder slightly.

Some boats may require a specialized transducer. If after completely reviewing the transducer installation instructions you find that the supplied transducer is not appropriate for your vessel, please contact NMP at 888-667-2767, or visit us on the internet at www.norcrossmarine.com for exchange information. You may exchange your new and unused transducer for another type, but keep in mind that some transducers may have additional costs.

Before installing the MT01, please ensure that the following parts are included in the packaging:

• Transducer with 25’ of Cable and Plug
• Transducer Support Bracket with Attached Kick-Up Bracket
• (2) Tapered Plastic Shims
• (2) Cable clamps
• Clam Shell Cable Cover
• (2) #10 x 1.25” self-tapping screws
• (2) #6 x .25” self-tapping screws

If any items are missing or damaged, please contact our Customer Service Department at 888667-2767.

Figure 1

• Straight Edge
• Screwdrivers
• Pencil
• Tie Wraps
• Water based antifouling paint (transom mount installation)
• Plastic Bag (in-hull installation)
• Petroleum Jelly (in-hull installation)
• 2 Part Epoxy Adhesive (in-hull installation)
• 30 Grit Sandpaper (in-hull installation)
• Safety Goggles
• Dust Mask
• Masking Tape

4” Minimum

 

Assembling and Mounting Figure 2

1. With the Locking Tab in the up position, align the transducer and bracket as per Figure 2 and slide the transducer into the Pivot Bracket until it cannot slide any further. (minimal force is required)
   
2. Press the Locking Tab down against the Pivot Bracket until it locks firmly into place.
3. Tape the template inserted in this manual against the hull as per Figure 3.
4. At the desired mounting location, position the template so the arrow at the bottom is aligned with the bottom
   edge of the vessel making certain that the template is parallel to the waterline of the vessel.
   
5. Using a 9/64" (4 mm) drill bit, drill two holes 7/8" (22 mm) deep at the locations indicated on the template
   marked with an “X”. To prevent drilling too deeply, wrap masking tape around the bit 7/8” (22 mm) from the
   point. To minimize surface cracking on fiberglass hulls use a chamfer or countersink bit. If either is not available, start drilling with a 1/4” (6 mm) bit to a depth of 1/16" (1 mm), then finish the hole with the 9/64” (4mm)
   bit.
   
6. Apply a marine sealant to the threads of the two #10 x 1-1/4" self-tapping screws and screw the bracket to
   the hull. DO NOT tighten the screws completely until you position the transducer as per the next section.
   

Positioning

 

below the bow (leading edge) of the sensor.

Figure 4

Tightening

Figure 5

Slide the transducer up or down to provide a projection of 1/8” inches (3 mm) below the hull bottom and then tighten the screws.

 

Cable Routing

Route the transducer cable over the transom, through a deck or splash-well drain hole or through a new hole drilled in the transom.

1.

If a new hole is required, it MUST be drilled well above the waterline.

2.

Mark the desired location with a pencil

3.

Check for obstructions behind the desired location inside the hull.

4.

Drill a hole through the transom using a 3/4” or 19 mm hole saw or spade bit.

5.

Route the cable over or through the transom.

1. On the outside of the hull secure the cable against the transom using the included cable clamps. Evenly distribute the clamps between
   the transducer and the location where the cable passes through or over the hull and mark the location with a pencil (Figure 6).
   
2. At the marked locations, use a 1/8" (3 mm) bit to drill a hole 3/8” (10 mm) deep. To prevent drilling too deeply, wrap masking tape around
   the bit 3/8"
   
3. Apply marine sealant to the threads of the 2 #6 x 1/2" self-tapping screws, position the two cable clamps and fasten them in place. (skip
   to #13 if the cable was routed over the transom or a hole that was already in the hull)
   
4. If a hole has been drilled in the transom position the clam shell cover over the cable where it enters the hull and mark the two screw
   holes.
   
5. Use a 3 mm or 1/8" bit to drill a hole 10 mm (3/8") deep. To prevent drilling too deeply, wrap masking tape around the bit 10 mm (3/8")
   from the point of the bit.
   

11.

Fill the remaining space in the hole with marine sealant.

12.

Apply marine sealant to the 2 #6 x 1/2" self-tapping screws and fasten the cable clam shell cover into place.

6. Route the cable to the depth sounder to the mounting location of the depth sounder . To reduce electrical interference, separate the transducer cable from other electrical wiring. Coil any excess cable and secure it in place using tie-wraps.

14.

Refer to the depth sounder owner’s manual to connect the transducer to the instrument.

Checking for Leaks

Antifouling Paint

Marine growth can accumulate rapidly on the transducer’s surface. If the vessel is left in saltwater for extended periods of time, all components of the transducer below the waterline must be painted with WATER BASED antifouling paint.

•

Never use ketone-based paint, as this type of paint can damage to the transducer’s plastic shell.

• Clear, spray on antifouling paints are very easy to apply and can be purchased from your local boating supply store.

•

Reapply paint as needed to prevent marine growth.

Testing

Applications

•

High Speed Boats to increase the performance of the depth sounder.

•

Trailer boats to prevent accidental damage to the transducer from trailering.

• Shallow draft boats to prevent accidental damage to the transducer to from intentional or unintentional ground.

•

NON-CORED hulls or Aluminum Hulls thinner than 1/8”

Hull Material

Since the hull absorbs acoustic energy, transmitting through the hull reduces the transducers performance. Fiberglass hulls are often reinforced in places for added strength. These cored areas contain balsa wood or structural foam which are poor sound conductors. To achieve optimal performance, find a location where the hull laminate is solid (not cored).

Location

Consult the boat manufacturer for the best in-hull transducer placement. If this information is unavailable, follow the guidelines below and see Figure

7.

Testing at the Selected Location

• Place the boat into a body of water where the depth is generally known
  (you may also consider using a stick to hang the transducer over the
  side of the vessel to develop known depth readings).
  
• While the boat is anchored, use one of the methods below in Figure 8
  to test the depth sounder with the transducer at the desired in-hull
  location.
  
• If the test readings noticeably differ from the known depth you will need
  to find another location.
  
• If the readings are similar mark the spot in the hull and proceed to
  Selecting the Adhesive.
  

FIGURE 8A

• If the hull surface is not smooth, sand it with 30 grit sandpaper until a
smooth surface is obtained. Partially fill a thin plastic bag with water, place the transducer inside and close it tightly with a tie wrap. Wet the surface
of the hull and press the transducer face against it through the bag.

FIGURE 8B

FIGURE 8C

Selecting the Adhesive

Use a viscous slow-cure epoxy or a fairly rigid, one part adhesive sealant. In cold climates, a one-part polyurethane adhesive, such as Boat-Life’s Life Seal‚ may be best. Do not use “5 minute” epoxies because they are generally brittle. RTV (silicone) adhesives (Weather Sealants, “Rubbery” Caulks, 3M 5200, etc) are not recommended because most of the sound energy is lost.

Gluing In Place

1. All surfaces to be bonded must be smooth, clean and dry. If the hull surface is not smooth, sand it with 30 grit sandpaper until a smooth surface is obtained in an area a little larger in diameter than the length of the transducer.
2. Clean and dry both the selected area and the face of the transducer with a weak solvent to remove any dust, grease or oil.
3. Prepare the adhesive as per the directions supplied with the adhesive.
4. Apply a generous amount of adhesive to the center of the face of the transducer (side opposite from the cable).
5. Press the transducer face onto the hull with a twisting motion to expel all air bubbles. (If the hull is slanted, temporarily secure the transducer in place with duct tape.) Allow the adhesive to cure as per the manufacturer’s instructions.
6. After the adhesive has cured, route the cable to the depth sounder mounting location. To reduce electrical interference, separate the transducer cable from other electrical wiring and coil and secure the excess cable in place using tie-wraps.

The Depth Reading on the Depth Sounder is Random, Flashing, and Inconsistent

1. Operate the unit under normal operating specifications and check to see if it operating properly (pay attention to minimum and maximum depth capabilities).
2. If this condition occurs only at certain speeds, then a transducer adjustment is needed. Refer to the “Helpful Hints for Transducer Installation” section below. Refer to the Transducer Adjustment Instructions for adjustment procedures.
3. Under certain circumstances sonar may not perform at the best of its ability. Extremely dirty water, very soft bottom, high speeds, deep water, or a combination of the above will result in incomplete or inaccurate readings. Please refer to the Transducer Adjustment Instructions to minimize the effects of these conditions.
4. If the transducer is transom mounted check to make sure that the transducer is not “kicked-up”. To prevent damage to the transducer, it will automatically release from mounting bracket (kick-up) when it is impacted. If this occurs refer to the Transducer Installation Instructions to reset the transducer for normal operation. If this happens frequently make sure that the trailer or boat lift bunks do not interfere with the transducer during loading and unloading.
5. Check the transducer cable connection on the back of the depth sounder. Make sure that the connection is made as per the instructions supplied with the depth sounder.
6. Contact NMP at 888-667-2767 for assistance if you are unable to correct the problems.

Helpful Hints for Transducer Installation (Transom Mounting)

 

Figure 9

1. Make sure the transducer is not mounted in any area where the water flow is interrupted by propeller turbulence or aerated water. If standing at eye level, behind the transducer and looking forward along the bottom of the boat hull there
   should NOT be any strakes, chimes, steps, or hull fittings inline with the transducer. If there are any of these obstruc
   tions, the transducer will need to be relocated to achieve optimal performance. The transducer CAN NOT be transom
   mounted on a Stepped-Hull vessel, it must only be in-hull mounted.
   
2. Make sure that the leading edge (bow - side closest to the bow of the boat) of the transducer extends at least 1/8” (3
   mm) below the bottom of the hull. Also make sure that the trailing edge (stern - side furthest from the bow of the boat)
   is 1/16” to 1/18” (1-3 mm) below the leading edge.
   

The Transducer Cable Supplied with the Transducer is Too Short for My Installation, Can It Be Extended

YES: To extend the transducer cable:

1. Cut the cable on the transducer side 1” (28 mm) from the plug. If the depth sounder display also has a plug, you will need to cut this plug off as well.
2. At both cuts, strip back the rubber cable cover 1” (28 mm) exposing the three internal wires (blue, white, and bare).
3. Using a soldering iron, solder the desired length extension cable (available at a boating supply store or by calling 888-667-2767) between the depth sounder display and the transducer. Be certain that the blue, white and bare wires are connected properly between the depth sounder display and the transducer and make sure the colors are consistantly matched throughout the splice.
4. Using electrical tape, or heat shrink tubing make certain that the soldered connections are complete

 6450 Kingspoint Parkway, Suite 6 Orlando, FL 32819 www.norcrossmarine.com

(p) 888-667-2767 -4

 

© 2004 Norcross Marine Products, Inc., All rights reserved. All specifications are subject to change without notice.

CENTERLINE OF VESSEL (Keel, Drive)

Drill Mounting Holes Here

 

Align Arrow Tip w/ Bottom of Boat

 This Line Parallel To Vessel’s Waterline

STARBOARD SIDE OF VESSEL

This Line Vertical