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Elcometer 266 Thickness Tester

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Overview

Overview

The Elcometer 266 can test porosity on coatings up to 7.5mm (300 mils) thick and is ideal for inspecting pipelines and other protective coatings. 

 

Premature corrosion of a substrate is usually due to a coating failure. A major cause is the presence of flaws in the finished coating. Metal pipes which have been dipped and galvanised may on the surface look to be protected but any problem with the application of the coating can result in the coating having tiny voids or holidays on the finish. Collectively called porosity, there are a number of issues which may be present.

 

  • Runs & Sags: Coatings move under gravity leaving a thin dry film. 
  • Cissing: When a coating does not re-flow to cover the voids generated by air bubbles being released from the surface of a coating.
  • Cratering: If the substrate is wet or the coating has poor flow characteristics, voids are created in the coating.
  • Pinholes: Caused by air entrapment which is then released from the surface, or by the entrapment of particulates (dust, sand etc.) which do not stay in place.
  • Over Coating: If too much coating is applied, as it cures internal stresses of the coating can cause it to crack.

Under Coating: Uncoated areas, or where the coating flows away from edges or corners of a substrate or welds. Insufficient coating over a rough surface profile may also leave the peaks of the profile exposed.

 

There are a number of detection methods and the Elcometer 266 uses a very high voltage technique.

 

The high voltage, or porosity technique, can be used to test coatings and the Elcometer 266 can test porosity on coatings up to 7.5mm (300 mils) thick and is ideal for inspecting pipelines and other protective coatings. Coatings on concrete can also be tested using this method. A power supply generates a high voltage DC or pulsed DC to a probe. As the probe passes over a flaw, a spark at the contact point sets off the alarm. This technique is suitable for locating the types of flaws described above, although care is required on thin coatings.

 

The Elcometer 266 holiday Detector features a built-in voltage calculator which will determine and set the correct test voltage based upon the test standard and the thickness of coating being tested. A Voltage calculator automatically sets the correct voltage from your coating thickness value and a dual safety switch on handle to avoid accidental switch on (Grey/orange probe handles only) Adjustable Voltage: 0.5kV - 1kV in 50V steps and 1kV to 30kV in 100V steps An internal Voltmeter/ Jeep tester ensures that the test voltage equals the selected voltage. Visual and audible alarms, Bright LEDs on the handle, as well as a loud buzzer, clearly indicate when a holiday is detected and to change maximum voltage range, simply select a different handle; 5kV, 15kV or 30kV DC or 30kV DC continuous