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Operation manual ISOTEST 4 S / 4 S
p l u s
3. Functional description
By using a high-voltage tester, even the smallest voids can safely be
detected. Voids can be pinholes, cracks or weak spots.
Depending on the grounding method employed, the following tests can be
performed:
Recognition of voids in non-conducting or semiconducting coatings
on electrically conductive carrier material.
Areas of application
,
e.g.,:
Systems for protection of pipelines
Coatings applied by the
manufacturer
(internal and external)
Coatings applied in the field
Tanks and containers
Coating material, e.g.:
Polyethylene (PE)
Bitumen
Butyl rubber bands
Petroleum jelly
Gummings
Rilsan
Halar
Ceramic
Enamel
Epoxy resin
Powder coatings
Carrier material, e.g.:
Fe-based metals
Ne-based metals
Electrically conductive fillers
Electrically conductive fleece
Concrete with sufficient residual
moisture
Before testing, the test object as well as the ISOTEST
®
test equipment
must be grounded.
Subsequently, a suitable testing electrode is moved in close distance to
the test object across the latter's entire surface. The test voltage applied
to the testing electrode should be chosen according to the coating
thickness as well as the relevant standards and manufacturer
specifications.