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Byk Gardner Gloss Measurement

Gloss is an important aspect of visual perception and appearance. Every day, we encounter gloss in many surfaces, just second to color. ISO 4616:2014 defines term the Gloss. The degrees of gloss are high glossgloss, silk gloss, semi-gloss, satin, matt, and dead matt. According to the International Committee of Illumination, gloss is a phenomenon where bright reflexes light on a surface. That is, the ability of a surface to reflect light specularly, causing surfaces to exhibit characteristics of a mirror.

While high gloss diffused share is very little, matt surfaces have a high share of diffusion. On smooth and polished surfaces, light is reflected very well. Rough surfaces do diffuse light, rendering a blurred appearance. Whereas colorimeters measure the diffused share of surface reflection, Gloss meters measure and quantify the share of light reflected from the surface. Gloss meter does these measurements by directing a light source at a specified angle. Gloss is measured in Gloss Units (GU), always indicating the incident angle used. ISO 2813 viewing geometries are used to measure gloss. They define three measuring angles for gloss measurement: 20 degree angle for high gloss; 60 degree angle for medium gloss, and 85 degree angle for near matt. The medium gloss is the universal measurement angle.

Byk Gardner Gloss offers a complete line of glossmeters. These glossmeters are designed to measure all ranges of gloss, whether for specific or universal applications – with highest accuracy and easy to use. Most Byk Gardner Gloss meters  conform with industry standards ISO 2813, ASTM D 523, ASTM D 2457, DIN 67530, JIS Z 8741, and ISO 7668.

Paint Thickness Meter / Gauge Adjustment, Calibration and Certification

The following article explains terminologies and examples related to the QNix Paint thickness meter by Automation Dr. Nix. ASTM D 7091 describes steps that are necessary before coating thickness measurement. This standard guarantees the reliability of the measurements when in conformity. Gauge must be calibrated, verified for accuracy and adjusted, where necessary. Generally, a paint meter is checked for accuracy by measuring a known thickness. Verifying the gauge accuracy requires the use of a certified coated or uncoated zero plate with a known shim thickness.

Automation Dr. Nix calibrates all QNix paint meters and issues a calibration certificate – free of charge. Note that some equipment manufacturers charge for this certificate. Calibration, which is a controlled and documented process, can also be performed by a qualified laboratory under controlled conditions – This could either be for recertification of the paint gauge or after gauge has been repaired.

The question is frequently asked, as to how often or in what intervals should paint gauge be recalibration. The answer to this question depends on many factors; the frequency of use, the stability of the calibration curve, the environment where the device is used, internal quality standards, etc,. This is the reason why there is no standard time interval for re-certification. Depending on the above factors, users can establish their interval or have the manufacturer recommend when it is appropriate for factory re-calibration. Automation Dr. Nix recommends a one – year interval.

A lower level method to ensure the accuracy of a paint thickness meter / gauge is via adjustment. Paint Gauge adjustments are usually made to correct anticipated or verified out-of-tolerance conditions. The gauge readings are aligned with known sample thickness to improve its accuracy. Adjustment is also recommended when dealing with metals of different chemical compositions, shapes, surface roughness or work conditions.

Corrosion protection, DUPLEX - Coating systems & Thickness measurement

Steel is a thermodynamically unstable metal. Its tendency to corrode is a natural process – atmospheric corrosivity, which intends to bring it back to its thermodynamic stable – iron in its oxide form. The result of ferrous ions reacting with hydroxyl ions is ferrous hydroxide, which in the presence of oxygen, oxidizes to a browny red colored hydrated ferrous oxide called rust. – the devil to be avoided. Corrosion protection addresses aspects of cost, safety and aesthetics. Without proper corrosion management systems, the cost of its prevention will continue to increase in many industries. Pipeline, auto makers, oil and gas, drinking and waste water industries continue to work with experts around the globe to develop cost – effective methods to counter the effects of corrosion for long lasting / durability of steel structures. According to NACE, the global cost of corrosion, also known as cost of corrosion damages, was USD 2.5 trillion in annually. This International body found that implementing efficient corrosion prevention could save the industry between 15-35 % cost of prevention (NACE International, March 8, 2016). Corrosion prevention systems for steel structures are cathodic prevention and other coating systems, such as painting and metallic coatings

There are many methods to prevent corrosion on steel structures, depending on the severity of the environmental impact / aggressiveness, cost involved and the structure to be protected. Because anode and cathode exist on steel surface, there is always a voltage different created that transmits currents to flow from anode to cathode, resulting in moisture build up on the surface. Cathodic protection, achieved via impressed current (low voltage direct current) or galvanic anode, whereby electrical connection to a metal with comparatively more negative corrosion capacity than that of the steel structure, reverses the flow of current and reduces the electrochemical reaction on the steel surface by converting the steel structure into a cathode.

Coating systems for corrosion protection will depend on design of the structure, surface preparation requirements, cost, maintenance and of course, environmental conditions. Depending on the above mentioned, coating systems can be metallic coatings only or Duplex systems – a combination with paint systems. Metallic system is based on non-ferrous metal such as aluminum, zinc and their alloys applied as hot dip galvanization, electroplating, and thermal spraying. The performance of this system relies on the thickness applied and the exposure to the environment. A good quantity of zinc dust in paint will allow it protect steel surfaces. Duplex coating system combines zinc galvanization and painting, such as the applying a paint layer over galvanized steel. This is comparatively, a high performance coating system, as it meritoriously retards or inhibits anode and cathode reactions, guaranteeing superior protection.

Heavy duty paint coating/ paint systems are predominantly used on long span bridges located at marine / bay areas for corrosion protection painting. Such a system could consist of a prime coat of zinc rich paint, intermediate epoxy resin and polyurethane with a total thickness of up to 15-20 mils. Measuring coating thickness is an irreplaceable part (next step) of determining coatings quality. Thickness of the coating also directly defines the durability and protection of the coating. However, some coating system possesses challenges to some thickness measurement gauges.

With a duplex coating systems, a Coating Thickness Gauge with a combination of a Hall Sensor principle / magnetic principle and eddy current probe, such as the QNix® 4500 or QNix® 8500 will allow for either the taking of two readings separately or taking one reading, while measuring the individual thickness of both paint and zinc layers. The duplex mode integrated in the QNix® 8500 modular system thickness gauge employs the Hall sensor principle for non- destructive coating thickness measurements on ferrous substrate and eddy current for non-ferrous measurements on non-ferrous substrate to calculate and simultaneously display readings of both layers.

 

Thickness Gauges / Mil Gauges operating on Hall Sensor Principle QNix Coating Thickness Gauges operate on Hall sensor principle – These electronic thickness gauges are designed to measure non-ferrous or non-ferromagnetic coatings on ferromagnetic substrate, such as measurement on iron or steel substrate – Qnix® 1200, QNix® 4200, QNix® 7500 Fe, QNix® 8500 Fe , as depicted below.

                       

Features of the QNix® Digital Coating Thickness Gauges

  • ·         Fast and easy to use- one hand operation
  • ·         Digital Display for easy reading of measurements
  • ·         Integrated probes – cable probes optional for QNix® 4200, QNix® 7500, QNix® 8500
  • ·         High accuracy and precision
  • ·         Easy zero-point calibration
  • ·         Large measuring range of up to 5,000 µm /200 mils
  • ·          
  • ·         Durable ruby measuring head tip
  • ·         Software – otional for QNix® 7500 aand QNix® 8500

 

Technical Specifications

Standard probe

Measurement range

Substrate

Deviation

 

Fe 2 mm

QNix 1200 / QNix 4200 / QNix 7500Fe / QNix 8500 Fe

2000 µm / 80 mils

Fe

      0 – 1999 µm: +/- (1 µm + 2%)

 

Fe 5 mm

QNix 4200 / QNix 7500Fe / QNix 8500 Fe

5000 µm / 200 mils

Fe

      0 – 1999 µm: +/- (1 µm + 2%)
2000 – 5000 µm: +/- 3.5%

 

Smallest measuring surface

Smallest radius of curvature

Smallest substrate thickness

Fe    25 mm

Convex:  5 mm
Concave: 25 mm

0.2 mm

 

Measuring Coating Thickness with a Duplex Coating System

There is a consensus among architects, construction engineers, automotive manufacturers, petroleum engineers, aviation engineers, appliance manufacturers that duplex coating systems for corrosion provides extra protection to coating systems. The zinc – iron alloy that acts as a primer before paint is applied increases a metal’s ability to resist corrosion damages and hence, extends the asset’s productive life and decrease frequency of maintenance.

In the integrated duplex / combined mode, QNix® 8500 modular Paint thickness Gauge / mil gauge conveniently, non-destructively and simultaneously measures both individual thicknesses of a duplex coating system by taking a single reading.   

 

 

 

This is what you get with our QNix ® 8500 modular measuring system

  • A modular measuring system with interchangeable probes and a measurement range of up to 5000 µm – guarantees later adjustment to the new measurement tasks throughout the entire product lifecycle
  • Variety of probes, one - gauge body
  • Fast, High measurement speeds of up to 120 measurements/minute
  • Quick and easy calibration function
  • Duplex measurement mode for measuring duplex coating systems
  • Large memory capacity - up to 30,000 measurement values in over 200 blocks with a statistics function and PC software for data evaluation and documentation
  • Integrated acoustic and visual display - when set minimum and maximum coating thicknesses are either fallen short of or exceeded
  • Robust and durable ruby measurement tip for a large number of measurements
  • An optional protective rubber holster   with belt clip to reduce shock sensitivity
  • Optional thumb-sized radio probe with a hand strap facilitates use in places that are difficult to access and takes safety regulations for work safety – such as during lattice tower checks – into consideration
  • Wireless probes for measurements at difficult to access areas
  • Probes for measuring thin layers

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