Airmar B175M Bronze Thru-Hull Transducer User Manual

Product Overview

The Airmar B175M is a high-performance bronze thru-hull transducer designed for marine applications. It features a 20-degree tilted element, providing optimal performance for boats with a deadrise between 16 and 24 degrees. This 1kW transducer utilizes CHIRP technology to deliver exceptional detail and resolution for bottom detection, distinguishing between individual baitfish, game fish, and underwater structures.

It operates within a medium frequency band, specifically from 85 kHz to 135 kHz, offering a beamwidth ranging from 24 degrees to 16 degrees. The B175M includes a depth and fast-response water-temperature sensor and is suitable for fiberglass or wood hulls up to 11 meters (36 feet) in length. It requires a Mix and Match Cable for installation.

Image: The Airmar B175M bronze thru-hull transducer. This image shows the robust bronze housing with the black transducer face and a small white dot indicating the orientation. The threaded shaft for thru-hull mounting is visible on the left.

Key Features

• Medium CHIRP Frequency: Operates from 85 kHz to 135 kHz, providing 50 kHz of total bandwidth.
• 20° Tilted Element: Compensates for hull deadrise, ensuring the transducer beam is directed straight down.
• 1 kW Power: Delivers strong sonar signals for deep-water performance.
• Integrated Sensors: Includes depth and fast-response water temperature sensing.
• Bronze Housing: Durable construction suitable for thru-hull mounting.
• Xducer ID® Technology: Provides transducer identification for compatible fishfinders.

Setup and Installation

Proper installation is crucial for optimal performance of your Airmar B175M transducer. It is recommended that installation be performed by a qualified marine electronics technician.

Pre-Installation Considerations:

• Hull Type: Suitable for fiberglass or wood hulls. Not recommended for cored hulls without proper preparation.
• Location: Choose a location free from turbulence, air bubbles, and propeller cavitation. The transducer face should be fully submerged at all speeds.
• Deadrise: The 20° tilt is designed for hulls with a deadrise between 16° and 24°.
• Cable Routing: Plan the cable route to avoid sharp bends, kinks, or interference with other electrical systems.

Installation Steps (Summary):

1. Drill Hole: Carefully drill the required diameter hole through the hull at the chosen location, ensuring proper alignment for the 20° tilt.
2. Prepare Hull: Clean and prepare the hull surface around the hole for sealant application.
3. Apply Sealant: Apply marine-grade sealant generously to the transducer flange and cable entry point.
4. Insert Transducer: Insert the transducer through the hull from the outside.
5. Secure: From the inside, secure the transducer with the supplied backing block and nut, tightening until the sealant squeezes out.
6. Connect Cable: Connect the Mix and Match cable to the transducer and route it to your fishfinder/sonar module.
7. Test: Perform a functional test of the transducer and sonar system.

Refer to the detailed installation guide provided with your transducer for complete instructions and safety warnings.

Operating Instructions

The Airmar B175M transducer operates in conjunction with a compatible CHIRP-enabled fishfinder or sonar module. Once installed and connected, the transducer will automatically provide depth and temperature data to your display unit.

Sonar Operation:

• Power On: Ensure your fishfinder/sonar unit is powered on.
• Transducer Recognition: Most modern units will automatically detect the B175M via Airmar's Xducer ID® technology. Verify that the correct transducer type (B175M or 85-135 kHz Medium CHIRP) is selected in your unit's settings.
• Frequency Selection: While the B175M covers a range, you may be able to select specific frequencies or sweep ranges within the 85-135 kHz band on your display unit to optimize for different fishing conditions or target types.
• Gain/Sensitivity: Adjust the gain or sensitivity setting on your fishfinder to achieve the clearest possible image of the bottom and targets.
• Range/Depth: Set the depth range appropriate for your current water depth.
• Scroll Speed: Adjust the scroll speed to match your boat's speed for optimal target separation.

Consult your fishfinder/sonar unit's user manual for detailed instructions on operating its specific features and settings.

Maintenance

Regular maintenance will ensure the longevity and optimal performance of your Airmar B175M transducer.

• Cleaning: Periodically inspect the transducer face for marine growth (fouling). Clean the face with a soft cloth and mild boat soap or a specialized transducer cleaning solution. Do not use abrasive cleaners or harsh solvents as they can damage the transducer surface.
• Anti-fouling Paint: If your boat is kept in water, apply a thin coat of water-based anti-fouling paint specifically designed for transducers to the bronze housing, avoiding the black transducer face.
• Cable Inspection: Regularly inspect the transducer cable for any signs of wear, cuts, or damage. Ensure all connections are secure and free from corrosion.
• Sealant Integrity: Check the sealant around the thru-hull fitting for any cracks or signs of degradation. Reapply sealant if necessary to prevent water intrusion.

Troubleshooting

If you experience issues with your Airmar B175M transducer, consider the following common troubleshooting steps:

For persistent issues, consult your fishfinder's manual or contact Airmar technical support.

Specifications

Warranty Information

Airmar products are manufactured to high standards and are typically covered by a limited warranty against defects in materials and workmanship. The specific warranty period and terms may vary by region and product. Please retain your proof of purchase.

For detailed warranty information, including coverage duration and claims procedures, please refer to the official Airmar website or the warranty card included with your product. Warranty claims are generally handled through authorized Airmar dealers or service centers.

Support and Contact

For technical assistance, installation questions, or troubleshooting beyond the scope of this manual, please contact Airmar customer support or an authorized Airmar dealer.

• Airmar Official Website: www.airmar.com (Check for support resources, FAQs, and contact details)
• Authorized Dealers: A list of authorized dealers and service centers can typically be found on the Airmar website.

When contacting support, please have your product model (B175M) and part number (B175C-20-M-MM) readily available.