PosiTest HHD High voltage porosity detector (holiday detector)

The PosiTest HHD by Checkline Europe is a Pulse Type DC Holiday Detector / Porosity Tester designed to to detect unacceptable discontinuities such as pinholes and voids in coatings and films using pulse DC.
A holiday test is also known as a continuity test.
It can be used for porosity tests performed on tank interiors, chemical storage, pipelines, vessels and other protective coatings. It also can measure coating thickness on concrete, concrete is not considered a 'conductive' substrate, as it is much less conductive than metal. However, concrete is still slightly conductive, and can carry enough current to allow holiday detectors to function. Therefore, for the purposes of holiday detection, concrete is considered a 'conductive' substrate.

With a wide range of probes and accessories available, high voltage holiday test can be carried out on a variety of substrates with a different coating thickness and is suitable for all applications.

A High voltage up to 35,000V (35kV) can used to inspect non-conductive coatings thicker than 500 µm.
Discontinuities can be detected when the charged electrode is passed over the coated surface. When a discontinuitie is encountered, current flows from the electrode into the substrate. The current returns to the detector through the ground (earth) wire, completing the circuit and triggering audible and visible alarms. An integrated peak reading voltmeter measures and displays the output voltage on the display while in use.

The PosiTest HHD can be used in either a stick-type or wand-type configuration (when used with the optional wand accessory).
A stick-type holiday detector is a standalone detector with internal battery power and electrodes that attach to the end of an extension rod (stick). The Wand' or 'Belt-style' detectors typically have a separate battery pack carried on the belt or shoulder strap and electrodes that attach to a handheld wand. The PosiTest HHD is the first combination stick type/wand type instrument on the market. With the optional handheld wand accessory, the PosiTest HHD converts into a wand style instrument suitable for voltages less than 15kV.

The PosiTest HHD has two primary operating modes:
1.Standby Mode: The detector is powered-up but not generating a high voltage.
2.Detection Mode: The detector is generating a high voltage and analyzing electrode voltage and current to determine if holidays are present.

A wide range of accessories are available,so the high voltage holiday test / Porosity Testing can be carried out on a variety of substrates with a different coating thickness and is suitable for all applications.