DeFelsko® HHD High Voltage Holiday Detector




  • Another quality instrument by DeFelsko
  • User-adjustable voltage range from 0.5 to 35 kV
  • Built-in voltmeter
  • Regulated pulse DC voltage output -±5% voltage accuracy
  • Complete kit comes with
    • Li-ion battery pack with built-in charge state indicator
    • 25ft earthing cable and smart charger with universal AC voltage input
    • stainless steel fan brush
    • 20in extension rod
    • Shoulder strap
    • Durable Pelican Storm case
    • Long Form Certificate of Calibration traceable to NIST.
  • Comes with a 2 year warranty

DeFelsko® HHD High Voltage Holiday Detector

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Holiday Detector / Coating Pin Hole Detector
Defelsko HHD Operates at voltages up to 35,000V. Typically used on coatings more than 500 µm thick. Ergonomic design aids operator comfort and reduces fatigue. Available for sale or rental/hire.

  • Lightweight, ergonomic design provides comfortable all-day use, reducing operator fatigue
  • Regulated pulse DC voltage output that won’t change under load — ±5% voltage accuracy
  • Voltage calculator feature — choose one of 11 international standards. Input the coating thickness to automatically calculate the required test voltage
  • Extensive electrode options — choose from a wide range of rolling spring and flat wire brush electrodes. Alternatively, use electrodes from other manufacturers with optional adapters — custom sizes available upon request
  • Long Form Certificate of Calibration included with each instrument

Conforms to ASTM D4787/D5162/G62, ISO 29601, NACE SP0188/SP0274/SP0490, AS3894.1

  • Built-in certified voltmeter (crest meter, jeep meter) displays and regulates the voltage at the electrode
  • Long Form Certificate of Calibration included with each instrument
  • Conforms to national and international standards including ISO, ASTM and NACE
  • Rugged, environmentally sealed ABS plastic enclosure
  • Weatherproof, dustproof and shockproof
  • Included Pelican Storm case with custom foam inserts for superior protection
  • Two year warranty
  • Detection of a holiday activates light and sound alarms. Audio alarm mode adjustable for differing environments.
  • Removable Smart lithium-ion battery provides power for up to 40 hours of continuous measurement

What is a holiday detector? What is the difference between a holiday detector and a porosity detector?
A holiday detector and a proximity detector are in essence the same thing. An electrical current is run over the painted/coated steel surface and in the event of porosity or pinhole in the coating (also known as a holiday) the current short-circuits to earth and creates an alarm. With high-voltage holiday detectors this can create a spark – hence the name spark tester. BlastOne has complete range of coating inspection instrumentation, such as digital coating thickness gauge, CTG, ferrous or nonferrous, surface profile meters / surface profile measuring device, testex tape, dew point meters, and magnetic surface thermometers.

There are many spark tester manufacturers which make different configurations of spark tester / holiday detectors – depending on the application and the complexity of the surface that requires testing for porosity in the paint coating. High-voltage spark testers come with different width bristle brushes or rolling spring probes, which can be used on pipelines. Low-voltage sponge detectors and sponge holiday detectors are also available. Paint inspectors should use caution when using high voltage porosity detectors high-voltage holiday detector.

It is important that 100% of the coated surface is tested for pinholes using a spark tester. Where ever a pinhole is located, a repair must be conducted in the paint coating – To ensure long coating life and and low maintenance. Most Holiday Detectors have regulated direct current pulse voltage outputs.

What voltage should I use for holiday detection / pinhole detection on my paint coating? To determine which voltage I need to use on my spark tester, it is important to refer to the paint coating spec sheet and the relevant standards applicable to high-voltage porosity detection.

How to choose the right Holiday Detector for detecting pinholes in coatings

How to Detect Pinholes and Holidays with the PosiTest HHD High voltage Holiday Detector