Wireless measuring technologies have proven to be advantageous wherever corrosion coating can only checked while climbing such as the quality and safety inspections of large steel constructions like pylons and antennae. Modern measuring gauges enable the user to check the coating thickness on the object completely and effectively. The use of small measuring probes such as the wireless miniaturized QNix® 8500 sat and the QNix® Keyless enable the user to work particularly fast and conveniently in each situation. Even under such difficult conditions as they occur on pylons, the work will be done in compliance with all safety regulations and without any cables hindering the work.

Coating material protects against corrosion  
To ensure passive corrosion protection organic coating materials are used. Inorganic coatings are mostly manufactured in a galvanizing process. It is the impermeability against affecting media of such coating materials that is the most important aspect of their various protective features.
Existing pores allow subsurface corrosion to spread and destroy the coating from underneath. Therefore, steel structures are layered with several coatings to protect the structure for a longer period of time. Careful selection of adequate coating materials and the quality of the coating process are of the utmost importance to the durability of the coated layers. To ensure the quality of a Duplex system for instance, the coating thickness of the galvanized layer and the organic coating on the steel underground have both to be measured in a controlled manner.

Combined measuring mode for convenient coating thickness measurements
The combined measuring mode of the QNix® 8500 measuring system from AUTOMATION Dr. Nix, Cologne offers a particularly convenient way of measure multiple layers in a controlled manner. The zinc layer and the upper organic layer are being measured in one single measuring process and then recorded. The coating thickness of both layers can then be analyzed simultaneously.

Providing safety - standards for the inspection of coating thickness.
As the protection and safety of large steel constructions are of such importance, the DIN EN ISO 12944 Part 7 “Corrosion protection of steel structures by protective paint systems” regulates the execution and monitoring of coating work. The standard explicitly requires dry coating thickness to be checked with measuring procedures and methods that are in compliance with the EN ISO 2808:2007(D) as stated under item 6.3. The standard includes: magnetic measurement methods based on the measurement of changes in the magnetic field as implemented by AUTOMATION Dr. Nix (item 5.5.6) and measurements with Hall sensors as well as eddy current measurement methods (item 5.5.8).

Measuring gauges for everyday use are sought-after
The ease-of-use and ease-of-calibration are of particular advantage for gauges measuring corrosion protection and coating thickness. Easy operation, a rugged construction and a design that is ideally suited for everyday use are only a few of the important requirements for a reasonable application of these gauges in the quality management of major projects.

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