Airmar DT800 - User Manual

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: The YELLOW O-ring must be in place near the
top of the insert to make a watertight seal.
WARNING: To retrofit the insert in a housing without a
valve, the insert must have a BLACK O-ring near the top to
make a watertight seal.
WARNING: The O-rings must be intact and well lubricated
to make a watertight seal.
WARNING: The valve is not a watertight seal! Be sure the
insert or blanking plug is fully inserted into the housing, and
the cap nut is screwed on completely.
WARNING: Always attach the safety wire to prevent the
insert or blanking plug from backing out in the unlikely event
that the cap nut fails or is screwed on incorrectly.
WARNING: Immediately check for leaks when the boat is
placed in the water. Do not leave the boat unchecked for
more than three hours. Even a small leak may allow
considerable water to accumulate.
WARNING: Stainless steel housing in a metal hull—Be
sure the washer contacts the hull. Do not tighten the hull nut
with the washer against the isolation bushing, as the
housing will not be firmly installed. If necessary sand the
isolation bushing until the washer rests against the hull.
CAUTION: Plastic housing—Never use a fairing with a
plastic housing; the protruding sensor would be vulnerable
to damage from impact.
CAUTION: Metal housing—Never install a metal housing in
a vessel with a positive ground system.
CAUTION: Never pull, carry, or hold the transducer by its
cable; this may sever internal connections.
CAUTION: The arrow on the top of the transducer must
point toward the keel or centerline of the boat. This will align
the angle of the element inside the transducer with the
deadrise angle of your hull.
CAUTION: Stainless steel housing in a metal hull—The
stainless steel housing must be isolated from a metal hull to
prevent electrolytic corrosion. Use the isolation bushing
supplied.
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.
Thru-Hull: Retractable with Valve & Temperature Sensor
Tilted Element
™
Transducer
Tilt Angles: 0

, 12

, 20

Model DT800
Patent http://www.airmar.com/patent.html
17-431-01 rev.08 07/26/18
Record the information found on the cable tag for future
reference.
Applications
• Plastic housing recommended for fiberglass or metal hull only.
Never install a plastic housing in a wood hull since swelling of
the wood can fracture the plastic.
• Bronze housing recommended for fiberglass or wood hull.
Never install a bronze housing in an aluminum hull because
electrolytic corrosion will occur.
• Stainless steel housing compatible with all hull materials.
Recommended for aluminum hulls to prevent electrolytic
corrosion provided the stainless steel housing is isolated from
the metal hull.
Match Tilt Angle of Transducer to Deadrise
Be sure your transducer model matches the deadrise angle of
your boat at the mounting location. See the top of the transducer
insert for the tilt angle (Figure 1). To measure the deadrise angle of
your hull at the selected mounting location, use an angle finder or a
digital level (Figure 2).
• 0° model for deadrise angles from 0° to 7°
• 12° model for deadrise angles from 8° to 15°
• 20° model for deadrise angles from 16° to 24°
Figure 2. Deadrise angle of the hull
transom view
deadrise angle
slope of hull
parallel to waterline
Figure 1. Top of transducer insert
12° model 20° model
Copyright © 2006 Airmar Technology Corp.
Copyright © 2005 Airmar Technology Corp.
0° model
Plastic
Low profile
P617V housing
OWNER’ S GUIDE & INSTALLATION INSTRUCTIONS
Smart
™
Sensor

Summary

Safety Precautions

General Safety Warnings

General safety rules for installation, including personal protection and handling.

O-ring Integrity and Lubrication

Importance of intact, lubricated O-rings for watertight seals.

Watertight Seal Verification

How to ensure a watertight seal and check for leaks.

Hull Material Specific Warnings

Warnings for stainless steel in metal hulls and plastic housings.

Transducer Handling

Precautions for handling the transducer cable and orientation.

Applications

Hull Material Compatibility

Recommendations for housing materials based on hull type to prevent corrosion.

Match Tilt Angle of Transducer to Deadrise

0° Model for Deadrise Angles

Specifies the 0° transducer model for hull deadrise 0-7°.

12° Model for Deadrise Angles

Specifies the 12° transducer model for hull deadrise 8-15°.

20° Model for Deadrise Angles

Specifies the 20° transducer model for hull deadrise 16-24°.

Mounting Location

General Mounting Considerations

Factors for choosing a mounting location, ensuring smooth water flow and no obstructions.

Mounting by Boat Type

Specific mounting advice for displacement, planing, outboard, inboard, and sailboat hulls.

Anti-fouling Paint

Paint Application Instructions

How and where to apply water-based anti-fouling paint for optimal performance.

Installation

Hole Drilling

Step-by-step instructions for drilling holes through the hull for installation.

Bedding

Marine Sealant Application

Applying marine sealant to ensure a watertight seal and proper bedding.

Installing

Housing Installation Steps

Detailed steps for inserting and securing the transducer housing in the hull.

Installing Without Valve

Specific instructions for installing in housings that do not have a valve.

Cable Routing & Connecting

Cable Management and Connection

Guidelines for routing the transducer cable and connecting it to the instrument.

Checking for Leaks

Leak Verification Procedure

How to check for leaks after installation and what to do if found.

Installation in a Cored Fiberglass Hull

Cored Hull Preparation

Steps for preparing a cored fiberglass hull to prevent water seepage and crushing.

Operation & Maintenance

Transducer Valve Function

Explanation of the self-closing valve's operation and its limitations.

Using the Blanking Plug

Instructions for using the blanking plug for protection and maintenance.

Cleaning the Insert

Cleaning Procedure

Methods for cleaning the transducer insert to maintain performance.

Winterizing

Winterization Steps

Procedure for winterizing the transducer to prevent damage from freezing.

Replacement Transducer & Parts

Ordering Information

Details on how to order replacement transducers and parts.

Airmar DT800 Specifications

General

Frequency	235 kHz
RMS Power	100 W
Depth/Temperature	Yes
Mounting Style	Thru-Hull
Cable Length	6 m (20 ft)
Depth Range	Up to 100 m (330 ft)
Material	Bronze
Weight	0.5 kg
Power	100 W
Operating Voltage	12-24V DC