DEVItector™ II V2
User Guide
BC421332622232en-010101
22 | ©Danfoss | FEC | 2022.07
Tracing procedure
WARNING
Hazardous voltage on terminals. Keep hands
away from terminals and connected cable.
The tracer is battery-driven and it is recommended
to switch OFF the tracer when not in use to increase
battery life.
1. Connect the HVU outlet cable to the heating cable
if not already connected.
2. Select menu “Burn/Trace”.
3. Select menu “Trace”.
4. Square pulses of 1
,
8 kHz frequency now flows into
the heating cable.
Depending on the depth of a cable installation,
you may change the tracing current by the knob.
Normal values of the tracing current are within the
300–500 mА range.
5. Connect the earphone headset to the tracer
console and mount the headset.
6. Use the magnetic tracer on crutch to follow the
heating cable starting from the cold cable. Sweep
sidewards to find the highest acoustic signal, that is
the location of the heating cable.
7. Adjust Gain, Offset or Volume if needed.
Moving the tracer
When tracing a heating cable it is important to
keep the tracer steady and in a vertical angle with a
constant distance to the floor.
Do not rotate tracer in a vertical axis.
Tracing the heating cable
When trying to locate the heating cable you must
move the tracer until the readout on the meter is
at maximum. Then move the tracer along the cable
keeping track by means of the readout of the meter.
It is important always to keep the tracer „lengthwise“
to the cable. If the tracer is turned 90º in relation
to the cable, the read out will be reduced to some
extent. In this manner, it should be possible to trace
the cable along its length across the floor. The signal
should vanish where the fault is, that is when you pass
the fault, the tracer readout drops to the low level
adjusted on the meter.
Beware of the special situations of screened cables
described in section “Gallery of Heating Cable Faults”.
You can now break up the floor and repair the heating
cable!
Twist effect (Transposition)
When tracing heating cables, it may seem as the cable
is wriggling along the floor (like a loop). However, the
cable is probably laid down in a straight line, but the
transposition of the relationship between the two
conductors used in the cable, gives a „twist effect“ of
the signal which is seen on the tracer.
Therefore, the tracer will at some locations show a
maximum signal when the tracer is right on top of the
cable, but at other locations will show a maximum
readout when the tracer is somewhat to the left or
right along the cable.
It makes the tracing of the cable slightly more difficult,
but when looking at the average line along the floor, it
should not cause any problems.
Single conductor without screen
With regards to single conductor cable faults
without screen, it is not possible to use the described
equipment, as two conductors are not provided.
