Accurate Utility Position and Depth
In a typical cable or pipe survey the Spar is mounted vertically on a survey pole directly below the GNSS receiver. The surveyor monitors the display continuously, using the on-screen indicators to maintain casual contact with the utility center line. Measurements may be collected automatically at fixed intervals or with single-shot measurements at selected locations. The pole may be equipped with a survey wheel for convenience.
When the measurement range of the Spar needs to be extended, either because the utility is buried deeper than the 10 ft. (3 m) range of a single spar or because access to the centerline is restricted or difficult, two Spar 300 PPS units may be mounted together on a cart or a vehicle. The separation of the Spars determines how much the range is extended, for example, a 6 ft. (2 m) separation yields about 40 ft. (12 m) range.
A Dual-Spar system using the Spar 300 RL1G1 may be configured to measure the 3-D separation between the Spars automatically. This is done by configuring one of the Spars as a GNSS base station, along the other one to continuously monitor its relative position. The automatic baseline measurement increases the flexibility of the system significantly, since the Spars can now be moved with more ease, even continuously, allowing the surveyor to position them optimally.
10 Watt Transmitter - The Broadband Loc-10Tx Transmitter Spar configuration C014 has multiple induction frequencies and Spar direct-connection frequencies ranging from 32Hz to 9.82kHz. This transmitter comes in a soft carry bag with connection leads and ground stake.