High Voltage Spark Tester

A stick type holiday detector is a standalone detector with internal battery power and electrodes that attach to the end of.

High voltage spark tester.

Due to their ac high frequency operation they can find faults in 100 coated articles without requiring an earth return connection. The elcometer 266 revolutionises high voltage dc testing of coatings porosity detection making it safer easier and more reliable than ever before. High voltage spark testers like the positest hhd operate at voltages up to 35 000v and are typically used on coatings more than 500 µm 20 mils thick. Suggested voltage v µm mil 200 to 300.

If any pin hole is detected in pvc a spark develops and electro magnetic counter counts the. A high voltage spark tester may however be used to test a paint system with a mean dry film thickness less than 500 μm but not less than 300 μm by agreement between the interested parties. The test voltage is suggested according to the thickness of the coating in bands as shown in table 1. For paint systems with a mean dry film thickness greater than 500 μm high voltage spark testers shall be used.

Unlike dc holiday detectors the ac output enables the detection of holes in coatings without requiring an earth return connection from the conductive material to the. As the probe passes over a flaw a spark at. 300 to 400. A test voltage is applied to the coating by moving a brush probe across the surface and where there is either a pinhole or flaw the voltage will spark through the coating at.

An ac spark tester is a device which provides a high voltage ac current via an electrode for testing non conductive membranes coatings and linings over conductive materials. The elcometer 266 holiday detector can be used to test porosity on coatings up to 7 5mm 300 mils thick and is ideal for inspecting coatings on pipelines and other protective coatings. What is meant by the term stick type or wand holiday detector. Glass lined or coated pipes and vessels to detect damages of interior coating applications on surfaces.

Spark testers have no audible or visual alarms to indicate a fault and rely on the operator to observe a spark jumping through a flaw in the coating material. The wire is passed through brass ball beads which carry high voltage. 8 to 11. Coatings on concrete can also be tested using this method.

The high voltage or porosity technique can be used to test coatings up to 25mm 1 thick and is ideal for inspecting pipelines and other protective coatings. Section 4 of this standard describes the use of high voltage spark testing and it defines the high voltage as being in excess of 800 v. Total dry film thickness. Can provide high and low voltage spark testing on painted.