Available Transmitter Clamps - SPX Radiodetection RD7000+ Operation Manual

7.3.2 Available transmitter clamps

Although transmitter and locator clamps look the same,
they have different internal windings. To prevent the wrong
clamp being connected, transmitters and locator clamps
have plugs of a different orientation.
Standard signal clamp
The standard clamp applies the transmitter signal very
selectively and effectively to a target cable up to 100mm
(4") diameter at frequencies from 8kHz to 200kHz.
The standard and small clamps have a double spring
action for positive toroidal contact.
Small signal clamp
The small signal clamp is useful for applying a signal to
a target cable in a pedestal or other place with limited
space. The clamp is suitable for cables up to 50mm (2")
diameter and can also be used for frequencies from 8kHz
to 200kHz.
WARNING! The transmitter must only be
connected to live services using the appropriate
accessory such as a plug connector or live cable
connector.
7.4 Sondes
7.4.1 When to use a sonde
A sonde transmitter is a small battery powered signal
transmitter that can be inserted into non-metallic ducts,
drains or sewers so they can be located and traced with
a locator. A wide range of transmitting sondes is available
to suit different applications. Sondes can also be used
to pinpoint joints in iron gas pipes, locate blockages in
plastic water pipes and monitor the progress of horizontal
boring tools.
7.4.2 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 locator
frequency; the locator 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.
7.4.3 Preparation
Insert a new battery into the sonde. A new battery or a
freshly recharged battery should be used at the beginning
of each day and preferably at the start of each new job.
Before inserting the sonde, check that the sonde and
locator are at the same frequency and working correctly.
To do this, place the sonde on the ground at a distance
from the locator that is equal to the rated depth of the
sonde. Point the locator at the sonde with the antenna
in line with the sonde (the opposite of using the locator
to locate a line) and check that the bar graph reading
exceeds 50% at maximum sensitivity.
7.4.4 Propelling a sonde
Sondes have a male thread at one end for connecting to
drain rods, or to other devices for inserting and propelling
the sonde along a drain or duct. Sondes may be floated
along drains at the end of a tether and floats are available
for fitting to the sewer sonde and super sonde. Sondes
can be strapped to high-pressure water jets or similar
devices used for cleaning, maintaining and inspecting
drains. Sondes used in underground drilling and boring
operations are normally housed in the boring or drill head
behind the boring or drill bit.
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