The 33kHz Duct Sonde is a transmitter used to trace the direction of small and congested ducts or conduits.

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Product code: CL/YIRSD-33 Category: Tags: Battery Operated Transmitter, Cobra Rodding, Cobra Rodding Spares, Duct Sonde, Duct Sonde (33kHz), Maxi Cobra High Capacity Rodding System, Maxi Cobra Rodding System, Medi Cobra Rodding System, Quick Trace Rodding System


The 33kHz Duct Sonde is a small battery powered transmitter which can be screwed onto the end of a duct rod and inserted and fed into a a duct or conduit. The direction of the duct or conduit can then be traced by a  locator set to Generator/ Transmitter Mode. The location of a blockage can be identified using this system with enormous cost saving potential.

Often the standard sized Sonde is too large to pass between cables when tracing electrical, telecommunication or cable conduits or ducts. The solution is the  33kHz Duct Sonde. The small diameter Duct Sonde, developed in conjunction with British Telecom, can be fed easily inside ducting without snagging.

Product Product Code Dimensions (mm) øxL
Duct Sonde (33kHz) CL/YIRSD-33 24 x 300

Key Features:

  • 33kHz transmit signal allowing detection and tracing by a Cable Avoidance Tool
  • Standard rod thread (” Whitworth 16 T.P.I.), female connector at one end
  • Range of 3.5-4.5 meters dependent on Locator
  • Simple to use
  • Robust
  • Single AAA battery operation.
  • Low battery signal
  • Fully weatherproof design to IP65
  • Compatible with most rods
  • Resin sealed electronics
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