How to set up an Elcometer Continuous DC High Voltage Holiday Detector

When it comes to testing the porosity of protective coatings on pipelines, ballast tanks, or bridges for example - or testing for flaws in coatings on concrete - typically the high voltage or holiday detection method is used.
The Continuous DC method is used to test non-conductive coatings up to 7.5mm (300mils) thick on conductive substrates.
Elcometer has two continuous DC detectors: the Elcometer 236, where the high voltage supply is generated within the instrument and sent to the probe handle via a high voltage cable; and the Elcometer 266, where the high voltage supply is generated within the handle, and connected to the instrument via a low voltage cable.
CONTENTS
0:42 - How Continuous DC holiday detectors work
2:13 - Getting Started
4:42 - Testing the cable connections and substrate
This video introduces the Elcometer 236 DC Holiday Detector and the Elcometer 266 DC Holiday Detector, how continuous DC holiday detectors work, how to set up your continuous DC holiday detector, and how to set up your holiday detector when testing for coating flaws on concrete substrates.
With your holiday detector successfully connected to the substrate and switched on, the next step is to set the voltage and sensitivity for testing the coating.
WORKING SAFELY - While this video is intended as a guide for how to use the Elcometer 236 and Elcometer 266, you should always consult the operation instruction book before use, and always take extreme care when using high voltage equipment.
This video is part of the Elcometer Pinhole and High Voltage Detector series. Visit www.elcometer.com/en/pinhole-...
For more information on the Elcometer 236 and the Elcometer 266, please contact Elcometer at [e-mail] or visit our website: www.elcometer.com/en/coating-i...
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Click here to download the video script in English:
www.elcometer.com/pub/media/P...
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STANDARDS:
Elcometer 236
ANSI/AWWA C213, AS 3894.1, ASTM C 536, ASTM C 537, ASTM D 4787, ASTM G 6, ASTM D 5162-B, ASTM G 62-B, BS1344-11, DIN 55670, EN 14430, ISO 2746, JIS K 6766, NACE RP0188, NACE RP0274, NACE RP0490, NACE SP0188, NACE SP0490
Elcometer 266
ANSI/AWWA C213, AS 3894.1, ASTM C 536, ASTM C 537, ASTM D 4787, ASTM D 5162-B, ASTM G 62-B, BS1344-11, DIN 55670, EN 14430, ISO 2746, ISO 29601, JIS K 6766, NACE RP0274, NACE RP0188, NACE RP0190, NACE RP0490, NACE SP0188, NACE SP0490

[@jarmaz5344]

Sound alarm lives its own life.

[@ElcometerOfficialChannel]

Hi,
Please ensure the sensitivity is not set to auto. We suggest starting at 50 uA and adjust accordingly on the known defect.

[@maheshparshad8857]

Good 👍

[@alescue2091]

Hi, I am about to inspect a rubber lagging, however in the previous test the sound alarm is always on once I put closer the wand to the lagging. I think it is because the rubber has in its formulation a component which is conductor. what would you recommend?

[@ElcometerOfficialChannel]

Thank you for your comment.
For testing slightly conductive coatings, we recommend the Elcometer 280 Pulsed DC Holiday Detector, as it uses a pulsing current to avoid the build-up of voltage charge on the structure you are testing, but it does depend how conductive the coating is.
If you have any further questions please contact [e-mail] or visit www.elcometer.com/contact-us to find your local Elcometer distributor.

[@mohdmustafa-yh4vs]

Hi I used to watching your videos and learned a lot. I really appreciated. My concern is how to calibrate the DC high voltage ( continues DC & pulsed DC) prior to use or inspection, as what we do for elcometer 456, so kindly provide the information, thank you.

[@ElcometerOfficialChannel]

Thank you for your comment.
The Elcometer 266 and 280 both have built-in jeep meters which monitor and, if necessary, correct the output voltage, ensuring the output voltage matches the voltage set by the user.
You don't have to calibrate DC high voltage testers in the same way you would an Elcometer 456 - you simply set your test voltage to your specifications, and your sensitivity if using the Elcometer 266.
For a certified calibration the instrument should be returned to an Elcometer Service Centre.
If you have any further questions, please contact [e-mail] or visit www.elcometer.com/contact-us to find your local Elcometer distributor.

[@jarmaz5344]

I was using 266 ( two different devices) , there is always issue with them. Tried it on epoxy coating 800um - was beeping for no reason even at lowest settings , and winylester coating over 4000um was same problem.

[@ElcometerOfficialChannel]

Hi,
We suggest setting the sensitivity to manual, not automatic. Start at 50 uA and adjust as per the user manual.
If you have any more questions, please get in touch at [e-mail]