The Mag–6 is intended for thickness measurement of ferromagnetic metal under a
layer of a non-magnetic coating or corrosion as well as of the layer of coating
or corrosion. It can also be applied to measure the thickness of ferromagnetic
sheets and products without coatings and to measure the protective
non-ferromagnetic coatings on a ferromagnetic basis.
The work of the device is based on the measurement of the normal component of
induction of a secondary field in two points, where its dependence on the
thickness of non-magnetic coating has various behaviors. Such dependence is
provided by the specially created source of a primary (magnetizing) field on the
basis of constant high-coercitivity magnets.
A: non-magnetic layer (rust, oil stain, dust or micro-defect of metal surface)
Local volume of material is magnetized by permanent magnet via ball made of
steel when the ball is contacting the material. After that, the probe is
separated from the material and the measuring coil interacts with the magnetic
field created by magnet in material. Interaction signal depends on the thickness
of non-magnetic layer on the surface of material
B: magnetic substrate ( steel, etc)
1: ball probe
2: permanent magnet
3: material under testing
4: measuring coil or Mall’s transducer
5: measuring unit
The Mag-6 consists of the transducers and the electronic block. The transducer
includes the magnetizing system and the measuring elements, and does not contain
special devices for detachment from the products. The electronic block has the
built-in program for processing of the measured results, which transforms the
received values of induction into the absolute ones of the thickness of
non-magnetic coating and ferromagnetic basis according to the given algorithm.
The measurement results are indicated on the service panel.
It is possible to expend the range of the measured thickness by introduction of
the additional mechanism of the transducer detachment from the product.