Holiday Detectors are devices used to minimize the effects of corrosion
by detecting the presence of “holidays” or “defects” in non-conductive
They detect defects by creating a voltage potential on an electrode,
passed over a conductive surface. The detector is also grounded. As
holes or fissures in the coating are passed over, the voltage jumps the
gap and completes a circuit which then causes a horn (also known as a
jeep) to sound.
Portable holiday detectors are designed for various pipeline, plant, and
other surface applications where the inspection surface remains
stationary and the detector is moved over the inspection surface. High
voltage detectors are used for thicker surface coatings, such as those
used on pipelines and other industrial applications. low voltage, wet
sponge detectors are used for thin film applications.