High Performance

Renamed the HD series, these 8 KHz transmitters take locating in nonmetallic lines to new depths. This high frequency gives better range in a small package. Plus, they operate well outside power line frequency, so electrical interference is a thing of the past.  The HD-40 fits nicely into a Spring Carrier, the heavier HD-80 will need a camera tractor to get down the line.


 Check out these accessories:


  • Size: 3/4″ x 4″
  • Range:  23 ft (non-metallic)
  • Battery: 1 AAA Alkaline Battery
  • Tone:  C
  • Line Size:  3″ and up

  • Size:  1-1/2″ x 10″
  • Range:  80 ft (non-metallic)
  • Battery:  4 “C” cell Batteries
  • Tone:  C
  • Line Size:  6″ and up
  • Available by custom order only
    Please call 800-541-9123

  • 16 Hz – This equipment operates at 16 Hz, a very low frequency with the advantage that it will penetrate steel or ductile iron lines (as well as cast iron and nonmetallic). It is compatible with any gear that operates at 16 Hz.
  • 512 Hz – This equipment operates at 512 Hz, the industry standard frequency for locating in cast iron or nonmetallic lines. It is compatible with any other manufacturer’s 512 Hz equipment.
  • 8 KHz – This Transmitter or Receiver operates at 8 KHz, a high frequency that works in nonmetallic lines only, but is very efficient and offers good range. Works with any 8 KHz equipment.
  • 223 KHz – This Transmitter or Receiver operates at 223 KHz, which is suitable for nonmetallic environments only. Only Prototek makes equipment that operates at this frequency (AR-1 and ATP-12).

You must match the transmitter’s frequency to the receiver’s frequency. A 512 Hz Transmitter will not work with a 223 KHz Receiver, etc.

The Range of a transmitter is the maximum distance, in feet, your receiver can be from the transmitter and still pick up a usable signal (using fresh batteries in both transmitter and receiver).

  • For 16 Hz transmitters the range is very dependent on the wall thickness of the pipe, so the range given is pessimistic, i.e., for the thickest typical lines. Range in nonmetallic lines can be up to 3 times that in steel; the range in cast iron is slightly less than in nonmetallic.
  • For 512 Hz transmitters, is made specifically for cast iron but works great in nonmetallic lines to. The range of an FD-10 is about 10 feet in cast iron and 15 feet in nonmetallic.
  • For 8 KHz transmitters, the range is for nonmetallic lines only – its signal will not pass through any kind of metal.
  • For a 223 KHz transmitter (ATP-12), the range is also for nonmetallic lines only. The range of an ATP-12 flushable transmitter is about 12 feet. Its signal will not pass through any kind of metal.

Note: These Range distances apply to Prototek receivers only! We cannot guarantee your results with other receivers.

“Tone” refers to the type of signal emitted by a transmitter. All of our transmitters are one of these types; many are available either way. Which tone should you choose? Here are some considerations about each type:

C – Continuous or “Solid” Tone

• available on almost all Prototek transmitters
• best to use for determining precise depth
• compatible with most other manufacturers’ equipment

• harder to distinguish signal from interference
• shorter battery life

B – Beeping (on/off) Tone

• easier to distinguish signal from interference
• longer battery life

• difficult to use for determining depth
• won’t work with LF2000 or LF2200, or many other manufacturers’ digital equipment