Long-Range Crawler Sondes
Prototek’s Long-Range Sondes are built for the deepest, most demanding locates — the jobs where the signal has to punch through depth, ground conditions and pipe material to reach the surface. All three industry-standard frequencies are covered so you can be ready for any environment.
The FD-40 is a 512 Hz sonde reaching roughly 30 ft through cast iron and 40 ft in non-metallic pipe. The HD-80 is an 8 kHz multi-frequency sonde with the family’s longest non-metallic reach at ~55 ft, and the LD-14 runs at 16 Hz to drive a locatable signal through ductile (~13 ft) and steel (~7 ft) pipe.
All three share a rugged 1-1/2″ x 10-3/4″ body (2–3 lbs) powered by four C-cells for long runtime, sized for lines 6″ and larger and at home on a crawler for mainline work.
| FD-40 | 512 Hz, 512 Hz Sonde receiver |
|---|---|
| HD-80 | 8 kHz, Multi Frequency Sonde receiver |
| LD-14 | 16 Hz, Multi Frequency Sonde receiver |
| FD-40 | ~30 ft in cast iron, ~40 ft in non-metallic |
|---|---|
| HD-80 | ~55 ft in non-metallic (not cast-iron compatible) |
| LD-14 | ~13 ft ductile / ~7 ft steel |
| Dimensions | 1-1/2" x 10-3/4" L |
|---|---|
| Weight | 2 lbs (LD-14: 3 lbs) |
| Minimum line size | 6" |
| Batteries | 4 C-cell |
|---|---|
| Best use | Crawler |
Interested in the Long Range Sonde?
Request pricing, availability, or a hands-on demo from our team.
