Cold Clamp precision long distance underground fiber optic cable fault locator

Our unique Cold Clamp locates fiber optic cable breaks & faults to a physical accuracy of better than 1 meter over long distance.

It causes a temporary optical loss marker at a location near the fault, allowing an OTDR user to find the physical fault with great accuracy. 

In practice OTDR distance measurement is accurate to 0.5% - 2%. Real-world systems also often have cable coils & undeclared topologies that impact distance measurement. So a cable fault can be hundreds of meters away from an expected location.

Diagram showing OTDR usage with a Cold Clamp

  • Works brilliantly over long distances on underground faults
  • Reduces network hazard and days of labor as exploratory trenching is eliminated
  • Minimizes community disruption and excavation damage
  • Find a hidden fault or break in fibre cables where there is no visible evidence
  • Minimizes service disruption, since it can be used on a live system
  • Economical repair allows revival of dark or abandoned fiber lines, reclaiming capacity
  • Inexpensive, non-destructive & field proven locator. Telcordia (Bellcore) report available
  • Use your existing training & OTDRs
  • Safety kit & work practices are provided. (a small amount of liquid nitrogen is easier to acquire and manage safely than most people think!)

General Cold Clamp specifications

Weight Empty 6.1 kg, Full 14.1 kg
Maximum Cable Diameter 38 mm
Known Applicable Cable types Fiber optic cable, jelly filled with acrylate coated fiber, including armored types.
Typical loss created by Cold Clamp 0.21 dB at 1300 & 1550 nm
Typical usage of liquid nitrogen 300 ml (15mm non-metallic cable)
Liquid nitrogen boiling Point 196 °C
10-Liter Dewar 45 days of boil dry time in static conditions

Part Number Description + Applications MSRP *
COLDCLAMP-1 Starter Kit


USD $4418.28
Add to Enquiry
COLDCLAMP-2 5 Cold Clamps & Consumables


USD $668.10
In stock
Add to Enquiry


USD $540.35
In stock
Add to Enquiry
COLDCLAMP-4 10 Litre Dewar


USD $3322.17
In stock
Add to Enquiry
COLDCLAMP-5 1 Litre Flask


USD $293.41
Add to Enquiry

* Prices are per instrument. Price excludes tax, duties, and shipping.
This product is designed, made, and calibrated in Australia.

Not sure?

Fill out our quote request form with as much detail as you can, and we'll help you get your test needs sorted.