Nexus 21 Boating Equipment Depth TH 52 User Manual

Depth TH 52  
- Transducer -  
Installation and Operation Manual  
English  
 
DEPTH TH52  
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DEPTH TH52  
CONTENTS:  
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DEPTH TH52  
INSTALLATION INSTRUCTIONS  
Thru-Hull Depth Transducer  
Low Profile, Flush, and Retractable Models  
IMPORTANT: Please read these instructions completely before proceeding  
with the installation. These directions supersede any other instructions in  
your instrument manual if they differ.  
WARNING: NEVER USE SOLVENTS!  
Certain cleaners, fuel, paints, sealants, and other products may contain strong solvents,  
such as acetone, which attack many plastics greatly reducing their strength.  
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Applications  
Plastic housing is recommended for fiberglass or metal hulls only. Never install a  
plastic thru-hull sensor in a wood hull, since swelling of the wood may overstress  
the plastic causing a fracture.  
Bronze housing is recommended for fiberglass or wood hulls only. Never install a  
bronze housing in a metal hull, because electrolytic corrosion will occur.  
Stainless steel housing is recommended for metal hulls to prevent electrolytic  
corrosion.  
Never install a metal housing in a vessel with a positive ground system.  
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Tools and Materials Needed  
Safety goggles  
Dust mask  
Electric drill with 10mm (3/8") or larger chuck capacity  
Drill bit: 3mm or 1/8"  
Hole saw (see table on page 1)  
Beveled countersink tool for B21, P269, and P314  
Countersink tool for B119, P217, and P219  
Sandpaper  
Mild household detergent or weak solvent (alcohol)  
File (installation in a metal hull)  
Marine sealant  
Additional washer for some aluminum installations  
Slip-joint pliers for metal housing  
Silicone grease or petroleum jelly (Vaseline ® ) (retractable units)  
Zip-ties  
Water-based antifouling paint (mandatory in salt water)  
Installation in a cored fiberglass hull:  
Hole saw for hull interior: (see table on page 1)  
Fiberglass cloth and resin (see page 4, #5)  
or Cylinder, wax, tape, and casting epoxy (see page 4, #5)  
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DEPTH TH52  
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Mounting Location  
3.1 Acoustic Noise  
Acoustic noise is always present and these sound waves can interfere with the  
operation of the transducer. Background noise from sources such as: waves, fish, and  
other vessels cannot be controlled. However, carefully selecting the transducer  
mounting location can minimize the affect of vessel generated noise from the  
propeller(s) and shaft(s), other machinery, and other echosounders. The lower the  
noise level, the higher the echosounder gain that can be used.  
3.2 Placement  
Choose a location where:  
The water flowing across the hull is smoothest with a minimum of bubbles and  
turbulence (especially at high speeds).  
The transducer will be continuously immersed in water.  
The transducer beam is unobstructed by the keel or propeller shaft(s).  
There is a minimum deadrise angle.  
There is adequate headroom inside the vessel for the height of the housing,  
tightening the nuts, and removing any insert (see table below).  
Minimum  
Outside Hull  
Inside Hull  
Model  
Headroom  
Hole Saw Size  
Hole Saw Size  
P17, Retractable  
200mm (8”)  
51mm (2”)  
60mm (2-3/8”)  
Caution: Do not mount the sensor:  
Near water intake or discharge openings, Behind strakes, fittings,  
or hull irregularities, Behind eroding paint (an indication of  
turbulence)  
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3.3 Boat Types  
(see Figure 1)  
Displacement hull powerboat—Locate 1/3 aft LWL and 150–300mm (6–12") off  
the centerline on the side of the hull where the propeller is moving downward.  
Planing hull powerboat—Mount well aft, on or near the centerline, and well  
inboard of the first set of lifting strakes to insure that the transducer is in contact  
with the water at high speeds. Mount on the side of the hull where the propeller is  
moving downward.  
Outboard and I/O—Mount just forward of the engine(s).  
Inboard—Mount well ahead of the propeller(s) and shaft(s).  
Step-hull—Mount just ahead of the first step.  
Boat capable of speeds above 25kn (29MPH)—Review the installation location and  
operating results of similar boats before proceeding.  
Fin keel sailboat—Mount to the side of the centerline and forward of the fin keel  
300–600mm (1–2').  
Full keel sailboat—Locate amidships and away from the keel at the point of  
minimum deadrise angle.  
Figure1.  
Best location for the transducer  
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Installation  
Cored fiberglass hull—Follow separate instructions on page 4.  
4.1 Hole Drilling  
Warning: Always wear safety goggles and a dust mask.  
1. Drill a 3 mm or 1/8" pilot hole from inside the hull. If there is a rib, strut, or other hull  
irregularity near the selected mounting location, drill from the outside.  
Note: If the pilot hole is drilled in the wrong location, drill a second hole in a better  
location. Apply masking tape to the outside of the hull over the incorrect hole and  
fill it with epoxy.  
2. Using the appropriate size hole saw, cut a hole from outside of the hull (see table  
on page 1).  
Note: All flush models require a countersink tool to create a “seat” in the hull.  
3. Sand and clean the area around the hole, inside and outside, to ensure that the  
sealant will adhere properly to the hull. If there is any petroleum residue inside the  
hull, remove it with either mild household detergent or a weak solvent (alcohol)  
before sanding.  
Metal hull—Remove all burrs with a file and sandpaper.  
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DEPTH TH52  
4.2 Bedding  
Caution: Never pull, carry, or hold the transducer by its cable; this may sever internal  
connections.  
1. Remove the hull nut and any washer (see Figure 2). Also remove the cap nut and  
the transducer insert.  
2. Apply a 2mm (1/16") thick layer of sealant around the lip of the housing that  
contacts the hull and up the sidewall of the housing, 6 mm (1/4") higher than the  
combined thickness of the hull, washer(s), and the hull nut. This will ensure there is  
sealant in the threads to seal the hull and to hold the hull nut securely in place.  
Figure 2  
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Installing  
Note: Ignore any arrows on the housing, insert, and blanking plug.  
1. From outside the hull, push the housing into the mounting hole using a twisting  
motion to squeeze out excess sealant (see Figure 2).  
2. Slide the washer onto the housing inside the hull  
Aluminum hull less than 6mm (1/4") thick—Use an additional washer. Never use  
bronze, since electrolytic corrosion will occur.  
3. Screw the hull nut in place. Hand-tighten only. Do not over-tighten.  
4. Remove the excess sealant on the outside of the hull to ensure smooth water flow  
over the transducer.  
5. After the sealant cures, inspect and lubricate the O-rings on the insert with silicone  
grease or petroleum jelly. Slide the insert into the housing. Seat the insert into  
place with a twisting motion until the key fits into the notch. Be careful not to rotate  
the outer housing and disturb the sealant. Screw the cap nut in place and hand-  
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DEPTH TH52  
tighten only. Do not over tighten.  
Warning: Always attach the safety wire to prevent the insert from backing out in  
the unlikely event that the cap nut fails or is screwed on incorrectly.  
6. Attach the safety wire. Attach the safety wire to one eye in the hull nut. Lead the  
wire in a counterclockwise direction and thread it through one eye in the cap nut,  
the pull ring, the second eye in the cap nut, and the second eye in the hull nut.  
Twist the wire securely to itself.  
7. Route the cable to the Server, being careful not to tear the cable jacket when  
passing it through the bulkhead(s) and other parts of the boat. To reduce electrical  
interference, separate the sensor cable from other electrical wiring and the engine.  
Coil any excess cable and secure it in place using zip-ties to prevent damage.  
8. Refer to the Server manual to connect the sensor to the instrument.  
5.1 Checking for Leaks  
Caution: Never install a thru-hull transducer and leave the boat in the water unchecked  
for several days.  
When the boat is placed in the water, immediately check around the thru-hull  
transducer for leaks. Note that very small leaks may not be readily observed. It is best  
not to leave the boat in the water for more than 3 hours before checking it again. If  
there is a small leak, there may be considerable bilge water accumulation after 24  
hours. If a leak is observed, repeat “Bedding” and “Installing” immediately.  
5.2 Blanking Plug  
1. Inspect and lubricate the O-rings on the blanking plug with silicone grease or  
petroleum jelly.  
2. Remove the safety wire from the pull ring and cap nut. Then, unscrew the cap nut  
(see Figure 2).  
3. With the blanking plug ready in one hand, pull the insert most of the way out.  
Remove the insert and rapidly replace it with the plug. Seat it into place with a  
pushing twisting motion until the key fits into the notch in the housing. With  
practice, only 250ml (10oz.) of water will enter the boat. Screw the cap nut in place  
and hand-tighten only.  
Warning: Always attach the safety wire to prevent the insert from backing out in  
the unlikely event that the cap nut fails or is screwed on incorrectly.  
4. Reattach the safety wire.  
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DEPTH TH52  
5.3 Installation in a Cored Fiberglass Hull  
The core (wood or foam) must be cut and sealed carefully. The core must be protected  
from water seepage, and the hull must be reinforced to prevent it from crushing under  
the hull nut allowing the housing to become loose.  
Warning: Always wear safety goggles and a dust mask.  
1. Drill a 3 mm or 1/8" pilot hole from inside the hull (see Figure 3). If there is a rib,  
strut, or other hull irregularity near the selected mounting location, drill from the  
outside. If the hole is drilled in the wrong location, drill a second hole in a better  
location. Apply masking tape to the outside of the hull over the incorrect hole and  
fill it with epoxy.  
2. Using the appropriate size outside hull hole saw, cut a hole from outside the hull  
through the outer skin only (see table on page 1).  
3. Using the appropriate size inside hull hole saw, cut through the inner skin and  
most of the core from inside the hull. The core material can be very soft. Apply only  
light pressure to the hole saw after cutting through the inner skin to avoid  
accidentally cutting the outer skin.  
4. Remove the plug of core material, so the inside of the outer skin and the inner core  
of the hull is fully exposed. Sand and clean the inner skin, core, and the outer skin  
around the hole.  
Caution: Always completely seal the hull to prevent water seepage into the core.  
5. If you are skilled with fiberglass, saturate a layer of fiberglass cloth with a suitable  
resin and lay it inside the hole to seal and strengthen the core. Add layers until the  
hole is the correct diameter.  
Alternatively, a hollow or solid cylinder of the correct diameter can be coated with  
wax and taped in place. Fill the gap between the cylinder and hull with casting  
epoxy. After the epoxy has set, remove the cylinder (see Figure 3).  
6. Sand and clean the area around the hole, inside and outside, to ensure that the  
sealant will adhere properly to the hull. If there is any petroleum residue inside the  
hull, remove it with either mild household detergent or a weak solvent (alcohol)  
before sanding.  
7. Proceed with “Bedding” and “Installing”.  
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CONNECTION TO INSTRUMENT/CONTACTS  
The depth transducer connects to the FI-30 Server or directly.  
The transducer cable is clearly marked with No 2 and the colours will correspond to  
input screw terminal on the Server.  
IMPORTANT! DO NOT CUT OR EXTEND THE 8 M TRANSDUCER CABLE!  
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Calibration  
Calibration is carried out in the Multi Control instrument (see manual).  
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Maintenance  
8.1 Antifouling Paint  
Surfaces exposed to salt water must be coated with anti-fouling paint. Use water-  
based antifouling paint only. Never use ketone based antifouling paint, since ketones  
can attack many plastics possibly damaging the transducer. Apply antifouling paint  
every 6 months or at the beginning of each boating season.  
8.2 Cleaning  
Aquatic growth can accumulate rapidly on the transducer’s surface, reducing its  
performance within weeks. Clean the surface with a soft cloth and mild household  
detergent. If the fouling is severe, use a stiff brush or putty knife to remove the growth  
taking care to avoid making scratches. Wet sanding is permissible with fine grade  
wet/dry paper.  
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TECHNICAL DATA  
Dimensions Transducer:  
Transducer cable:  
Power supply:  
51 x 86 mm (1 5/8” x 3 3/8”)  
8 m (9.9 ft + 26.2 ft)  
12V DC (10-16V)  
Power consumption:  
Depth range:  
0.2 W  
0.8 - 150 m (3 - 450 ft) at  
speed up to 30 knots.  
± 0.1 %  
Accuracy:  
Type of transducer:  
Temperature range:  
Piezocrystal 200 kHz  
Operation -10°C to + 70°C  
Storage -35°C to +85°C  
The depth measuring is based on the echos speed in water which is 1.463 m/sec.  
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Copyright ©:  
Nexus Marine AB  
Kuskvägen 4, 191 62 Sollentuna, Sweden  
Tel: +46 -(0) 8 – 506 939 00. Fax: +46 -(0) 8 -506 939 01  
 

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