Gauge Overview - Elcometer 266 Manual Del Usuario

2 GAUGE OVERVIEW

The Elcometer 266 detects flaws in protective coatings up to 7mm
(25mils) thick and is ideal for inspecting coatings on pipelines and
other protective coatings.
The coating under test can be electrically non-conductive or partially
conductive (such as coatings which contain metallic or carbon
particles). The coating must be at least 200µm (0.008") thick, and
preferably over 500µm (0.020"), thick.
The underlying substrate must be an electrically conductive material
such as metal or concrete (concrete is reasonably conductive because
of its water content).
Typical flaws are pinholes (a very narrow hole running from the
coating surface to the substrate), holidays (small uncoated areas),
inclusions (objects trapped in the coating, e.g. grit from blast cleaning),
air bubbles, cracks and thin spots.
The Elcometer 266 probe handle generates a high DC voltage which
is applied to the surface of the coating via a probe. An earth signal
return cable is connected between the instrument and the substrate.
When the probe is passed over a coating flaw, the electrical circuit is
completed and current flows from the probe to the substrate. As a
result, the instrument gives audible and visual alarms and a spark may
be produced at the flaw.
The user can perform the test to any one of a number of international
testing standards using the built-in Voltage Calculator.
The Elcometer 266 features an easy to use menu-driven graphical
interface which guides the user during setup of the instrument and
during measurement.
The instrument will operate in one of three voltage ranges; 0.5 kV to 5 kV,
0.5 kV to 15 kV and 0.5 kV to 30 kV. The voltage range is determined by
the model of high voltage probe handle fitted to the instrument - not the
instrument itself.
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