S9 MiniSonde 33kHz


The S9 MiniSonde is a small 9mm (0.35”) diameter transmitter designed to be inserted into non-metallic pipes or ducts, and enables operators to trace the route of small diameter pipes or ducts and to precisely locate any blockages.

The flexibility of the S9 MiniSonde allows the Sonde to travel around bends or pass existing cables, while durable design and construction helps to protect the S9 MiniSonde from damage when travelling around bends or when encountering obstacles within the duct. The S9 MiniSonde is the ideal accessory for small diameter ducts, where flexibility and strength are required.

Locatable to 13' (4m) and measuring 0.35 x 5.4" (9 x 138mm). Supplied as a kit that includes Sonde, 2 batteries and case.

Part No: 10/SONDE-MINI-33 

Pack of 10 x batteries for S9 MiniSonde.


Detection Depth 4m    
Battery 1 x lithium cell
Min. bend radius 130mm    
Diameter 9mm (0.35")
Signal frequency 33kHz    
Total operating length 137mm
Battery Life Approx. 10 hours at room temperature, 8 hours at 0ºC temperature
Rod fitting M6 female/adhesive fit

Product offering 

The S9 MiniSonde is sold as a kit, containing: 

a. S9 MiniSonde 
b. 2 x batteries 
c. Case 
d. User guide 

A pack of 10 replacement lithium batteries is also available 

Find out more about the S6 MicroSonde. 


More and more cables and pipes are being laid in the underground network, making buried utility ducts increasingly congested. Before attempting to insert other cables into an existing duct it is important to know if there is enough space for another cable or if there are any blockages within the duct.

Blocked / damaged ducts

Utility pipes and ducts may become blocked or deformed, both before and while in use. These blockages cause delays due to failed cable insertions, and can even require excavation to clear them - an expensive and time consuming task.

The S9 MiniSonde is designed to be pushed or pulled into a small buried pipe or duct using the installer’s standard installation kit. By using a Radiodetection locator the operator can follow the path of the sonde as it travels, confirming its route and reducing the risk of damage from local excavations.

If a blockage is found, an operator can precisely locate the position where the sonde stops from above ground, and evaluate if excavation is required.