R509LH Depth/Temperature Transducer

Part # 000-10575-001

The R509LH is an epoxy, thru-hull CHIRP transducer, ideal for sportfishing and commercial vessels up to 12 m (40 ft) in length. This dual-channel transducer combines Low CHIRP frequencies to accurately track the bottom in deep water, and High CHIRP for great resolution in shallower water. 

Key Features

  • 28-60 kHz Low CHIRP with 23-9° port/starboard beam width (11-5° fore/aft)
  • 130-210 kHz High CHIRP with 8-4° beam width
  • Up to 1200 m (4000 ft) range with Low CHIRP
  • Narrow High CHIRP is great at pinpointing structure in shallower water
  • 25 internal broadband ceramics
  • Thru-hull with epoxy housing, stuffing tube and high-performance fairing (can retrofit to existing R209 installations)
  • Suitable for fiberglass, wood and metal hulls
  • Ideal for sportfishing and commercial vessels up to 12 m (40 ft) in length
  • Recommended for use with the BSM-3 broadband sounder module
Where To Buy

    Dual Channel CHIRP

    Using pulsed transmissions swept across a range of frequencies, CHIRP technology delivers target resolution and depth penetration superior to traditional single-frequency sonar. This dual-channel CHIRP transducer operates in the 28-60 kHz Low CHIRP frequency range with a 23-9° port/starboard beam width (11-5° fore/aft), and the 130-210 kHz High CHIRP frequency range with a 8-4° beam width. With Low CHIRP, the R509LH provides an operating depth of up to 1200 m (4000 ft).


    One sensor does it all. Able to measure both depth and temperature in a single package, the R509LH simplifies installation and requires just one connection to your echosounder module or multifunction display.


    With epoxy housing, the R509LH is suitable for thru-hull mounting in fiberglass, wood and metal hulls. Thru-hull mounting places the transducer in the water on the outside of your boat’s hull; a hole must be drilled for installation, and a fairing block is required to ensure proper alignment. This typically offers the best depth measurement and fishfinding performance.

    Calculate the beamwidth for this transducer

    R509LHFrequencyCone AngleBeamwidth
    130 kHz  
    210 kHz  
    28 kHz 23°  
    60 kHz  
    Depth: Update
    NB: depending on the strength of your transducer pulse