RD4000 Locating System User Manual
Page 55
Types and range of receiver clamps
Standard clamp
The clamp plugs into the receiver accessory socket and is
used for cable identification at points where the cable can be
accessed. The standard clamp is suitable for cables up to
10cm/4-inch diameter.
Small clamp
The small clamp performs the same function as the
standard clamp but is useful in cramped situations
where there is insufficient access for the standard clamp.
The small clamp is suitable for cables up to 5cm/2-inch diameter.
Current Direction (CD) and Current Measurement (CM) clamp
The CD/CM clamp plugs into the accessory socket of the
receiver and enables CD and CM measurements to be made
on individual cables.
Sondes
When to use a sonde
A sonde transmitter is a small self-contained signal transmitter designed for insertion into non-metallic ducts,
drains, or sewers so that it may be located and traced with a receiver. A wide range of transmitting sondes is
available to suit different applications. In addition to tracing non-–metallic pipes and ducts, sondes can be used
to pinpoint joints in iron gas pipes, locate leaks in plastic water pipes, and monitor the progress of horizontal
boring tools.
Choosing a suitable sonde
Check that the sonde has sufficient range for the application and is dimensionally small enough and sufficiently
robust for the application. Ensure that the frequency of the sonde corresponds with the receiver frequency, as
the receiver will not locate the sonde unless the frequencies are the same. Sondes are marked with their
transmitting frequency. Ensure that the means of propelling the sonde is available together with the correct
fittings and couplings.
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