location system DD120 and DD220 SMART
The DD120 and DD220 SMART cable location systems detect underground lines made of metal. Intelligent accessories make it possible to locate non-conducting pipes made of plastic, clay or concrete.
Cable location systems help to prevent damage in excavation work and thus avoid unnecessary costs.
How the DD120 and DD220 SMART cable location systems work
Current-conducting lines generate electromagnetic fields. The DD120 and DD220 SMART cable location systems detect these fields like antennas and reveal where the lines are located. Metallic lines that do not supply electric current are somewhat harder to detect. But with a few tricks from physics they can also be located. The solution is to generate radio signals like those all around us in our modern environment. Underground conductors receive these signals and transmit them. In doing so, they generate an electromagnetic field that is stronger than the field in the surrounding soil. The DD120 and DD220 SMART can pick it up.
Fibre-optic cables cannot be detected with the DD120 and DD220 SMART cable location systems.
Leica DD120 location system
The Leica DD120 offers building professionals a simple, intuitive means of detecting and avoiding hidden underground utilities during excavation work. In auto mode it makes detection even easier, ensuring damage prevention and safe operation.
Use the DD120 cable locator in conjunction with the DA220 signal generator. You can choose from a wide range of accessories for depth measurements, improved accuracy and extended applications.
Ref.-No. 705594
Leica DD220 SMART location system
The Leica DD220 SMART is a user-friendly, intuitive system for locating underground utilities. It simplifies cable searches and provides added safety. In auto mode it reliably shows underground lines on an easy-to-read colour display. On-board video support, usage alerts and diagnostics are combined to improve usability, protect workers and prevent damage to lines.
Use the DD220 SMART cable locator in conjunction with the DA220 signal generator. You can choose from a wide range of accessories for depth measurements, improved accuracy and extended applications.
Ref.-No. 705599
Leica Cable Location Systems DD120 and DD220 SMART
| Leica DD120 | Leica DD220 SMART | |
| Ref.-No. | 705594 | 705599 |
| Power | 50 Hz model or 60 Hz model | 50 Hz/60 Hz power supply and harmonic |
| Radio mode | 15 kHz to 60 kHz | 15 kHz to 60 kHz |
| Auto mode | Current, radio | Power, radio, 33 kHz |
| Transmitter mode | 33 kHz, 8 kHz | 131 kHz, 33 kHz, 8 kHz |
| Depth range in line mode | 0.3 m to 3 m | 0.1 m to 5 m |
| Depth range in sonde mode | 0.3 m to 3 m | 0.1 m to 7 m |
| Depth accuracy | 10 % (for an undistorted signal) | 5 % (for an undistorted signal) |
| Protection class | IP 54 | IP 66 |
| Operating temperature | -20°C to +50°C | -20°C to +50°C |
| Power supply | 6 x LR6 (AA) alkali | 7.4 V Li-ion |
| Operation duration | approx. 15 h | approx. 20 h |
Signal generator and Signal clamps
Lines that do not carry electric current cannot be located with certainty because they do not emit electromagnetic waves. In these cases a signal generator is used, which produces a strong electromagnetic signal at a clearly defined frequency. The signal propagates along the buried conductor and can be easily detected with the DD120 and DD220 SMART location systems. The stronger the signal, the easier it is to locate the line and measure its depth.
If the connection point of a conductor is accessible, the signal generator can be directly attached, using the signal clamp if necessary. In other cases the signal from the generator can be sent into the ground through a ground spike. If the direction of a suspected cable is known, the signal generator can be pointed towards it. In any case the signal from the generator is coupled to the conductor being searched for.
Leica DA220 signal generator
The Leica DA220 signal generator is a simple, intuitive device for improving safety on construction sites by avoiding underground utilities. With its four power settings and three location frequencies it provides everything you need for better cable detection. It comes with a ground spike and crocodile clamps.
Optionally available with 1 watt or 3 watts
| Adjustable search frequencies: | |
| Induction mode | 33 kHz and 8 kHz |
| Direct connection mode | 131 kHz, 33 kHz and 8 kHz |
| Power supply | 7.4 V Li-ion battery with 15 h battery operating time |
| Protection class | IP 67 |
| Output power | max. 1 watt Ref.-No. 705595<br>max. 3 watt Ref.-No. 705593 |
50M trace rod and sonde
Pipes made of plastic, clay or concrete cannot be located with the DD120 and DD220 SMART location systems because they do not conduct electricity or transmit electromagnetic waves.
But they can also be located and traced with the help of practical accessories like the 50M trace rod and sonde. The 50M trace rod is a flexible conductor, wound on a reel, that can be inserted into a pipe for tracing. The signal generator is clamped to the rod, allowing the pipe to be located and traced with the DD120 and DD220 SMART detection systems. The sonde, which is available as an accessory, emits its own electromagnetic waves. When pushed into a wastewater line, drain pipe, etc. it can be detected by the DD120 and DD220 SMART location systems, allowing the line to be traced.
