Choosing the appropriate frequency is crucial when identifying underground utilities. Factors such as the utility’s depth, size, material, and the level of congestion (closeness to other utilities) all play a role in determining the right frequency. Larger diameter pipes that are directly buried, like those used for water or gas, often have bell housing ends with insulators and rubber gaskets, and thus require a higher frequency. On the other hand, smaller diameter utilities that are well-grounded, directly buried, or span long distances in conduits, function better with a lower frequency.
The VM-810 operates at a frequency of 83.1kHz, making it suitable for locating water and gas utilities, which typically involve larger pipes with bell housings and gaskets. The higher frequency of the VM-810 is also effective for detecting ungrounded small diameter drop wires and for inducing signals through the soil onto services when direct connection is not feasible.
The Distance Sensitive Left/Right Guidance TM
This feature of the VM-810 allows the locator to determine which antenna is receiving the strongest signal, thereby indicating the direction to move to be directly above the buried line.
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