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Instrumentation • Computing • Control


test voltage situated in the test head provide convenience and


practicality and three test voltage instruments cover


0.8 - 5kV, 4 - 20kV and


8 - 40 kV. Te measurement head of the latter allows for the testing of thick coatings. Te test method is based on the fact that all electrically insulating coating materials have a much higher disruptive strength than


air does. High voltage is applied using,


Fig. 2. The Poroscope HV40 from Fischer Instrumentation.


for example, a brush-like electrode that is moved across the surface of the specimen. In the case of a defect (pore or scratch) a sparkover occurs, which is indicated acoustically and optically by the system.


Portable and practical Te portable HV40 is a sturdy, metal-clad instrument designed for practical application on rugged job sites. Te high voltage is generated inside the probe head, improving both operator safety and ease of use. It eliminates the need to drag long, bulky HV insulated cables across the work area – be it a wet ship deck


Fig. 3. Electrodes for porosity applications.


Te intactness of corrosion protection on any metal structure in an offshore environment is critical to its performance and longevity and instruments such as the Poroscope HV40 make the job of porosity testing safer and much more efficient. l


For more information ✔ at www.engineerlive.com/iog


Peter Ho is general manager, Fischer Instrumentation (GB). www.fischergb.co.uk


or tank – which also makes the instrument far less sensitive to moisture. Fig. 3 shows all the types of electrodes – sweeper, flat with rubber tongue, roller and circular ring – that are used for large area enamel, rubber or synthetic coatings, paint coatings and pore testing of foils and exterior pipe walls. Rotating electrodes are for interior pipe wall pore testing up to a diameter of 125mm.


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For more information ✔ at www.engineerlive.com/iog


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