How Pushrods and Sondes Work

Pushrods and sondes are specialized tools for accurately locating and inspecting underground utilities, pipes, and blockages without excavation. Flexible, durable pushrods navigate tight bends and long runs inside pipes or conduits, often carrying a camera or sonde at the tip for visual inspection or signal transmission. Sondes are small, battery-powered transmitters that emit detectable radio signals, enabling operators to trace the exact position, depth, and path of non-metallic pipes, sewers, and drains—typically up to 3–15 meters deep—using compatible surface locators. Rugged construction and broad system compatibility make these tools essential for water, sewer, and municipal applications.

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Schonstedt Standard Sonde 512Hz
- Schonstedt Standard Sonde 512Hz is a compact, battery-operated transmitter designed for precise underground pipe and duct locating. Emitting a robust 512Hz signal, this sonde enables accurate tracking of non-metallic pipes and ducts at depths of up to 5 meters, even in challenging environments. Its small size allows for easy navigation through tight spaces, and it connects seamlessly to a flexrod for smooth insertion into pipelines. Built for durability and reliability, the Standard Sonde is ideal for utility professionals and contractors who need dependable, pinpoint location of underground utilities and structures.

Schonstedt FlexiTrace Conductive Push Rod for Pipe & Blockage Locating
- Schonstedt FlexiTrace Conductive Push for Pipe & Blockage Locating is a versatile tool engineered for locating pipe blockages and tracing non-metallic pipes where traditional sondes cannot pass. This dual-function system operates as both a push rod and a transmitter, allowing users to trace the entire length of the rod or pinpoint a blockage with a compatible sonde and Schonstedt locator. Available in 164-foot and 262-foot reel lengths, the FlexiTrace is ideal for navigating complex pipe networks, identifying blockages, and mapping underground utilities. Its robust construction and compatibility with Schonstedt locators make it a reliable choice for utility professionals and maintenance crews seeking efficient, accurate pipe tracing and blockage location.

FAQs

1. How do pushrods and sondes work together during pipe inspections?

Pushrods provide the flexibility and length to navigate pipes or conduits, while sondes—small battery-powered transmitters—are attached to the pushrod’s tip to emit a detectable signal. A surface locator then tracks the sonde’s position and depth, allowing technicians to map underground routes and pinpoint blockages or damage accurately.

2. Can sondes be used in both metal and plastic pipes?

Yes, sondes work in most pipe materials, including metal, PVC, and clay, as long as the surface locator can detect the signal. However, signal range and accuracy may decrease in heavily reinforced or high-metal-content pipes, so operators often adjust the frequency or use more powerful sondes.

3. What is the ideal pushrod length for residential versus commercial applications?

Residential tasks often require pushrods around 100 to 150 feet to navigate typical household plumbing or conduit runs, while commercial or municipal jobs may demand 300 feet or more to reach deep sewer lines or large industrial piping systems.

4. How do you ensure a sonde signal is strong enough for accurate locating?

Maintaining fresh batteries, selecting the correct frequency for soil conditions, and avoiding electromagnetic interference are key. Some operators also verify the signal strength periodically during use by lifting the locator above ground to confirm consistent detection.

5. Are pushrods and sondes safe to use in pressurized or water-filled pipes?

Most sondes are waterproof and pressure-rated, making them safe for water-filled or low-pressure systems. However, it’s important to check the manufacturer’s specifications before using them in high-pressure or chemically aggressive environments to prevent damage.

Pushrods & Sondes