COATING THICKNESS GAUGES 

The coating thickness gauge is that most important variable in product quality, process control, and cost control. Film thickness for measurement may be done with much different kind of tools. To understanding the equipment that is available for film thickness measurement and how to use it is useful to every coating operation.
The problems that determine what kind of method is best for a given coating measurement include the kind of coating gauges, the substrate material, the thickness gauge range of the coating,  size and shape of the part measured, and the rate of the equipment. Regularly used measuring techniques tools for treated organic films include nondestructive dry film methods for example magnetic, ultrasonic, micrometer measurement and also destructive dry film methods for example cross-sectioning or mass measurement. Some methods are also available for powder and liquid coatings to measure the film before it is treated.

The gauges and functionality

Magnetic film thickness gauges

Magnetic film thickness gauges are used to nondestructively live the thickness of a nonmagnetic coating on ferrous substrates.  The foremost coatings on steel and iron are dignified this way.  The magnetic gages use one in every of a pair of principles of operation is magnetic pull-off electromagnetic induction.

Magnetic pull-off

 Stable magnet, a calibrated spring, and a graduated scale are used by Magnetic pull-off gauge. The magnetism between the magnet and magnetic steel pulls the each along. As a result of coating thickness separating the two will increase, it becomes easier to tug the magnet away. Thinner coatings gauge will have stronger magnetic attraction whereas thicker films will have comparatively less magnetic attraction. The challenging with magnetic gages is sensitive to surface unevenness, curvature, substrate thickness, and additionally the makeup of the metal alloy. The Magnetic pull-off gages are rugged, simple, cheap, portable, and often do not want any calibration adjustment. They are an honest and low-cost totally completely different in things where quality goals want solely a handful of readings throughout production.

They are a pair of style of gages models that is pencil-type and roll back model.

The Pull-off gages are normally pencil-type or rollback dial kind models. Pencil-type models use a magnet that is connected to a helical spring that works perpendicularly to the coated surface. The foremost pencil-type pull-off model gages have huge magnets and are designed to work in barely one or a pair of positions that partially complete gravity. The extra correct version is out there that option a little, correct magnet to measure on very little, hot, or hard-to-reach surfaces. A triple indicator ensures correct measurements when the gage is pointed up, down, or horizontally with a tolerance of ±10%.

The Rollback dial models gauge is that the foremost common kind of magnetic pull-off gage. A magnet is connected to one end of a turning balanced arm and connected to a calibrated hairspring These rollback gauges are easy to use and have a balanced arm that enables them to figure in any position, freed from gravity. They only safe in short-tempered environments and are commonly utilized by painting contractors and little powder coating operations. Typical tolerance is ±5%.