Toneable system locates underground duct blockages
GMP's new system with transmitter, receiver, sonde and rodders allows full mapping of undergound duct routes.
The Toneable Duct Rodder System from General Machine Products (GMP) allows technicians to remain above-ground, without having to dig or trench, when they need to find duct blockages or otherwise map an underground duct system.
System components include a signal transmitter, signal receiver, sonde, and duct rods that feature 18-AWG copper wires embedded into their fiberglass cores.
"To accurately detect rodder position in underground ducts," GMP says, "the Toneable Duct Rodder System employs a transmitter that sends a signal along the entire length of the rod. The rod is also fitted with a self-contained transmitter sonde. Above ground, a receiver is used to detect the rod's exact location at depths of up to 50 feet."
Rodders are available in various diameters and lengths. Each rodder's leading edge has a tapered male-threaded head and the trailing end includes a female-threaded fitting. The signal receiver has an LCD screen, is IP54-rated and battery-operated, and includes a choice of frequencies. The signal transmitter has 3 watts of power and provides a number of inductive or direct frequencies. The sonde, a self-contained transmitter that connects to the end of the duct rod, helps trace the duct route and can locate duct blockages or collapses.