© 2023 Radiodetection Ltd 56
5 Propel the sonde a further 1 or 2 meters, pinpoint, and
mark the position. Repeat this pinpoint procedure at
similar intervals along the line of the drain or duct until
the survey is completed.
Checking sonde depth
The RD8200SG locator will automatically display the
depth of a located sonde providing the locator is correctly
oriented and positioned above the sonde. Using the LCD
compass as a guide, rotate the locator until the compass
indicates the sonde is in East / West position.
Figure 13.12: Calculating sonde depth
Calculation method
Pinpoint the sonde. Move the locator in front of the sonde
and still with the antenna in line with it, increase sensitivity
to find the Peak of the ghost signal. Move the locator to
behind the sonde ensuring that the locator blade is always
in line with the sonde. Find the null positions A and B (See
Figure 8.10). Measure the distance between them and
multiply by 0.7 to give an approximate depth
measurement.
Flexitrace
The Flexitrace is a traceable plastic covered fiberglass rod
incorporating wire conductors and is used for locating
small diameter, non-metallic pipes to a depth of 3 meters.
The Flexitrace can be inserted into a pipe or duct as small
as 9 mm / 3/8” internal diameter, and with a minimum bend
radius of 250mm. Batteries are not required, as the
FlexiTrace is powered by any Radiodetection transmitter.
The FlexiTrace has a maximum power rating of 1W. When
using the FlexiTrace with a Radiodetection Tx-5 or Tx-10
transmitter the output limit must be set to 1W in the MAX
P menu and the output voltage limit set to LOW in the MAX
V menu.
WARNING! Failure to follow the Tx-5 or Tx-10
instructions above may result in the tip of the FlexiTrace
becoming too hot to touch, resulting in risk of personal injury
and damage to the equipment.
The FlexiTrace can be used in two modes: Sonde mode
or Line mode. In sonde mode only the tip of the FlexiTrace
is energized whilst in line mode its whole length is
energized.
To use as a sonde, connect both transmitter leads to the
FlexiTrace stud terminals. As the FlexiTrace terminals are
not color coded it does not matter to which terminals the
leads are connected. To use the FlexiTrace in line mode,
connect the red transmitter lead to one of the FlexiTrace
terminals and connect the black transmitter lead to a
suitable ground connection.
13.7 Stethoscopes
When to use a stethoscope
At times, it may not be possible to put a clamp around a
cable because of congestion or because of inaccessibility.
A stethoscope antenna should be used in place of a clamp
to identify the target cable(s).
How to use a stethoscope
Plug the stethoscope into the locator accessory socket.
Press the concave head against each cable in turn to
detect a maximum signal.
Stethoscope range
Large stethoscope antenna
The large stethoscope antenna, which plugs into the
locator accessory socket, is used for cable identification in
situations where the cable is exposed. It is particularly
useful for identifying heavy cables lying in a tray where it
is not possible to fit a clamp. The concave detector head
on the end of the insulated, flexible gooseneck is placed
firmly against the cable to be identified. If there are a
number of cables, the stethoscope antenna will give the
strongest response from the cable to which the transmitter
signal has been applied.
Small stethoscope antenna
The small stethoscope antenna has a 25mm (2”) concave
head at the end of a 2m (6½ ft) lead. The small
stethoscope can be screwed into an extension rod or used
at the end of several extension rods joined together for
identifying inaccessible small cables.
Figure 13.13: FlexiTrace
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