551 Advanced Underground Locator

Catalog Number: 551

Introducing the Tempo 551™ Advanced Underground Locator – the Professional Grade, All-in-One Location Solution.

Designed for professionals and packed with advanced features, the 551 brings you everything you want in a Locator including; dual simultaneous frequencies, Peak & Null receiver, and IntelliTrack™ digital noise rejection.

The proprietary IntelliTrack™ digital noise rejection technology offers signal clarity in noisy environments to give you an effortless locating experience that’s smarter, faster, and more accurate.

Connect to any type of wire, use our inductive clamp or transmitter antenna when a direct connection is not available. You can also choose between peak/null modes or between two simultaneous frequencies while in the field, always ensuring optimal signal performance and enabling side-by-side comparison to better detect and characterize anomalies.

And if you often locate near AC lines or change transmitter frequencies the 551 cable locator offers IntelliTrack™ digital noise rejection technology, so you can reliably trace lines near power sources. If AC interference is an issue, the 551 will give you two unique options for tracing without needing to walk back to the transmitter. Select Passive Mode to detect the source of the noise.

Whether you’re tracing electrical lines, irrigation wires, telecom cables, metal pipes, or Sondes (33 Khz) this rugged, IP54-rated underground wire locator is built for performance. The 551 can trace utility lines over a mile (1.6 km) and locate them at depths exceeding 20 feet (6 m). It can also triangulate depths up to 10 feet (3m). With an ergonomic, lightweight receiver and a rugged case, the 551 delivers reliability, efficiency, and ease of use at an affordable price.

Take your underground locating and safe digging to the next level—experience the 551 today!

Assembled in the USA

Dual Simultaneous Frequencies

  • By default, the 551™ Transmitter sends out two frequencies simultaneously ensuring optimal signal performance and enabling side-by-side comparison to better detect and characterize anomalies - all while in the field.

IntelliTrack™ Noise Rejection

  • With IntelliTrack™, we added digital noise rejection in our Receiver so that you can clearly track cables carrying a signal, despite electrical interference.

Inductive Clamp

  • With the IC-5 clamp, this locator can apply a signal without needing to disconnect or de-energize the line.

Transmitter Induction

  • Place the 551 Transmitter in Inductive Mode a few feet over a line and emit a long-range, low-bleed signal.

Passive

  • Detect and trace power lines carrying live AC-current without using the Transmitter.

Peak/Null

  • Now you don’t have to choose, you have both in the same locator. Track the line with Peak and pinpoint with Null in any frequency.

IP54

  • Protected with IP54-rated resistance to water and dust means the 551 can withstand conditions on any job site.

Accurate Depth Triangulation

  • Calibrated 45-degree indicator to enable a more precise triangulation of line depth.

Bright LCD

  • High contrast sunlight readable LCD display makes the screens easy to read in any lighting conditions.
Attribute name Attribute Value
[ - Full Unit - ]-
[ OPERATING CONDITIONS ]-
Operating Temperature14 °F to 131 °F (-10 °C to 55 °C)
-
[ WEIGHT ]-
With Batteries11.5 lbs
Without Batteries9.6 lbs
-
[ - CASE DIMENSIONS - ]-
Length28 in. (711mm)
Width12.6 in. (321mm)
Height4.1 in. (104mm)
-
[ - TRANSMITTER - ]-
[ PHYSICAL SPECIFCATIONS ]-
Weight without batteries2.6 lbs
Weight with batteries4.3 lbs
Ingress Protection RatingIP54
-
[ BATTERY SPECIFICATIONS ]-
Battery Type6x D cell (Alkaline Recommended)
Dual Frequency Mode40 hrs typical
Single Frequency Mode50 hrs typical
Auto Shutoff3 hrs
-
[ OPERATING FREQUENCIES ]-
Direct Connect1.75 kHz + 33 kHz Simultaneous
Inductive Coupler33 kHz
Inductive Antenna133 kHz
-
[ MAX OUTPUT POWER ]-
Direct Connect3.7W rms (1.8 rms for EU model)
Induction Mode<1W
-
[ - RECEIVER - ]-
[ PHSYICAL SPECIFICATIONS ]-
Weight without batteries1.0 lbs
Weight with batteries1.2 lbs
Ingress Protection RatingIP54
Headset sound pressure level96±3 dBA SPL max (When used with Tempo HS-1)
-
[ BATTERY SPECIFICATIONS ]-
Battery Type4x AA cell
Typical Battery Life35 hrs
Auto Shutoff1.5 hrs
-
[ OPERATING FREQUENCIES ]-
Passive Mode50/60 Hz
Active1.75 kHz, 33 kHz, 133 kHz

Available Accesories

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551 Receiver
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551 Case
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