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3.1.6 Detection of the narrow (blocked) part of an installed non-metallic
pipe
Preconditions:
* The pipe must be made of non-conductive materials (such as plastic).
* The pipe should not be loaded.
* The emitter is connected to a metal helical tube (metal tube or flexible
conductor) and an auxiliary ground, as shown in Fig. 3-1-6.
* The measurement method is the same as that used in the example.
1. If there is current in the pipeline, cut off the power, and connect the ground
correctly when the pipeline is not loaded.
2. The end of the ground must be perfectly anchored, and the end of the
ground of the emitter must be at a certain distance from the pipe to be
measured. If this distance is too short, the signal and the circuit cannot be
precisely located. If you only have a helical tube that is made of non-
conductive material (such as fiberglass), we suggest you insert a metal wire
with a section area of about 1.5mm2 into the non-metallic helical tube, and
then push it towards the part narrow.
Precautions
1. If you only have a helical tube that is made of non-conductive material (such as
fiberglass), we suggest that you insert a metal wire with a section area of about
1.5mm2 into the non-metallic helical tube, and then push it towards the narrow part.
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