Airmar B150M – bronze through-hull transducer 300W (95-155kHz) with 0° tilted element + temperature – (8-pin)

This Airmar B150M CHIRP transducer operates in the mid-frequency band, ranging from 95 kHz to 155 kHz.

No, this bronze-housed transducer is recommended for fiberglass or wooden hulls. It must never be installed on a metal hull due to the risk of electrolytic corrosion.

This Airmar B150M transducer has a 0° tilted element. This means it is designed for hulls with a deadrise angle between 0° and 7° at the mounting location.

Yes, this Airmar B150M transducer is equipped with a fast-response water temperature sensor.

This depth sounder is fitted with an 8-pin connector, compatible with the appropriate Garmin devices.

To install this transducer, a 51 mm (2 inch) diameter hole must be drilled from the outside of the hull. For sandwich fiberglass hulls, a 60 mm (2-3/8 inch) hole is required from inside the hull.

CHIRP tilted-element transducers offer several advantages:

The ceramic elements are tilted inside the housing to compensate for the hull’s deadrise angle, ensuring the beam is directed downward. They maximize echo returns and eliminate the need for a fairing block. Their low-profile design protrudes only 6 mm below the hull, making them ideal for towed or lifted boats. They provide superior resolution, precise fish detection, and better bottom-finding capability at high speeds.

The housing and nut of this depth sounder are made from bronze alloy. The cap is made from impact-resistant and chemical-resistant plastic.

The ideal mounting location must meet the following criteria:

Water under the hull must be smooth, with minimal bubbles and turbulence.The transducer must remain continuously submerged.The transducer’s beam must not be obstructed by the keel or propeller shaft.Choose a location away from interference sources (propeller, other machinery, other fishfinders, cables).For CHIRP transducers, mount in a cool, well-ventilated area away from the engine to prevent overheating.

Yes, it can be installed on a cored fiberglass hull. However, this requires additional steps to seal the hull core to prevent water ingress, using fiberglass and resin, or a cylinder, wax, tape, and casting epoxy resin.

The -3 dB beam width of this transducer varies with frequency:

Approximately 26° at 100 kHz.Approximately 20° at 130 kHz.Approximately 17° at 155 kHz.

Mid-frequency provides a good balance: it allows deeper sounding than high frequencies while offering better resolution than low frequencies. It also produces a wider beam than high frequencies, increasing coverage beneath the boat and the chances of finding fish, with clear images even at higher boat speeds.

Yes, applying water-based antifouling paint on the depth sounder is mandatory if the boat is used in saltwater to prevent marine growth.

No, it is imperative never to install a metal housing (such as bronze) on a vessel with a positive ground system, as this can cause electrolytic corrosion.