E. Miscellaneous Notes and Suggestions:
1. Energizing Lines.
a) When energizing a line inductively, avoid setting the
transmitter directly on the line or within a foot of large
masses of metal. The transmitter will continue to func-
tion under these conditions, but the energizing efficien-
cy might be reduced considerably.
b) For long tracing runs, periodically bring the transmitter
closer to the area you are working and re-energize the
line. This will insure a solid tracing signal.
c) Signals entering a line at one point may be transferred
to another line through a common point. Erroneous
conclusions may result. This kind of transfer may occur,
for instance, when energizing a gas service that feeds
into a water heater. At the heater the gas service may
be electrically common with the incoming water pipe;
the water pipe might carry the signal as well, thereby
leading the operator to false conclusions while tracing.
The operator should be aware of the possibility for
false signals.
2. Tracing Lines.
a) Remember to be aware of airborne signals when work-
ing close to the transmitter. Either offset the transmitter
over the line as described, or energize the line from a
point further from where you are working.
Model 902 Pipe & Cable Locator
27
