Sondes are small self-contained battery powered transmitters. Sondes are propelled through non-metallic pipes and ducts and can be located on the surface by a sonde locator or buried utility locator with a sonde mode. Sondes are also built into other products such as a sewer push camera, robotic crawler camera, or attached to a jetter hose. Sondes come in a variety of sizes which ties into how deep they can be located. Different frequencies are available which allow sondes to be located in metallic or non-metallic pipes and ducts.
The vLocCam2 sonde locator comes standard with sonde/camera frequencies of 8 kHz, 33 kHz and 512 Hz. The vLocCam2 receiver is equipped with two "passive" locate modes of Power and Radio which will detect the presence of power lines, CATV, telephone and some metallic pipes which radiate 60 Hz from nearby or overhead power lines and VLF signal from nearby broadcast towers.
The VM-540 Sonde Locator comes standard with sonde/camera frequencies of 33 kHz, 512 Hz, and 640 Hz. The VM-540 sonde locator is equipped with a "passive" Power mode which will detect the presence of power lines, CATV, telephone and some metallic pipes which radiate 60 Hz from nearby or overhead power lines.
The vScan receiver has passive "power" locate modes as well as sonde frequencies of 33kHz and 512Hz. The passive power mode can be used to sweep an area to locate live power, cable TV, or telephone lines before digging.