13
Locating a sonde
The Loki receiver is capable of locating a Schonstedt sonde. Before attempting
to locate a sonde ensure that the sonde’s batteries are fully charged. Schonstedt
recommends using new or fully recharged batteries at the beginning of each day
and preferably at the start of each job. Also check that the Loki receiver is operating
at the same frequency as the sonde and that they are both working correctly.
To test the Loki receiver and the sonde, position the sonde at a distance equal to
its rated depth range from the Loki receiver. Point the Loki receiver at the sonde
with its blade parallel to the direction the sonde is travelling.
Check that the bar graph shows more than 50% at high sensitivity
Note: In Sonde Locate mode the blade of the Loki receiver must aligned with the
sonde, this is opposite to other line locate methods.
Sonde Procedure
1. Attach the sonde to the rod and insert it into the drain or duct to be mapped.
Keep the sonde just in view.
2. Hold the Loki receiver vertically directly over the sonde with the blade in line
with the sonde’s orientation.
3. Adjust the sensitivity of the Loki receiver to give a bar graph reading between
60-80%.
A sonde radiates a peak field from the centre of its axis with ghost signals at each
side of the peak. Move the locator to one side and then along the axis of the sonde
forwards and backwards to detect the ghost signals.
