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Summary of Contents for Stefan Mayer Instruments FERROMASTER
- Page 1 Stefan Mayer Instruments FERROMASTER Permeability Meter Instruction Manual – February 2013 – Stefan Mayer Instruments, Dipl. Phys. Dr. Stefan Mayer, Wallstr. 7, D-46535 Dinslaken, Germany, Phone/Fax: +49 2064 479762/3...
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Page 2: Table Of Contents
Contents 1 Safety Precautions 2 General Description 3 Operation 4 Measurement of Permeability 4.1 Dependence on the magnetic field strength ..4.2 Remanence ..... 4.3 Sample surface . -
Page 3: Safety Precautions
The FERROMASTER is used for material selection in applica- tions where totally non-magnetic material must be used. Exam- ples are: electron microscopes, electron/ion spectroscopy, NMR systems, and compass navigation. Apart from quality control of stainless steel and other alloys the instrument can also be used for the detection of material defects induced by stress. - Page 4 Physical Laboratory (NPL, Teddington, UK). The calibration can be easily readjusted. A calibration standard is supplied with each instrument. As a special feature the FERROMASTER is provided with a robust waterproof case (protection IP65) and is therefore well suited to applications in harsh industrial environments. The built-in battery serves for 50 hours operation.
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Page 5: Operation
Operation Before the instrument is switched on the protective cap must be removed from the permeability probe. The probe and its metal tip which is now visible must not be exposed to a strong magnetic field because the magnetic properties of the built-in permanent magnet may then change, and the instrument can be damaged. -
Page 6: Measurement Of Permeability
The measured permeability value is shown on the LC display. The FERROMASTER is calibrated to precise permeability stan- dards which have been manufactured and calibrated by the Na- tional Physical Laboratory (NPL, Teddington, UK). For easy check of the calibration a calibration standard is supplied with each instrument. -
Page 7: Remanence
FERROMASTER contains a permanent magnet which pro- duces a constant magnetizing field of 35 kA/m. Remanence Many materials, like some sorts of stainless steel, can be perma- nently magnetized in a strong magnetizing field. The magneti- zation which remains when the magnetizing field is switched off... -
Page 8: Dimensions Of The Sample
Dimensions of the sample For small samples the result of the permeability measurement depends on the dimensions of the sample. For example, the sensitivity of the instrument increases with increasing sample thickness. The sensitivity is independent of the dimensions for samples which are more than 5 mm thick and have a lateral diameter of more than 2 cm. -
Page 9: Power Supply
Power Supply The FERROMASTER is powered by a 9 V battery which serves 50 hours operation. If the capacity of the battery is ex- hausted ”LOBAT” is shown in the upper right corner of the digital display. The battery should then be replaced. In order to open the battery compartment the two lower screws on the back of the instrument must be removed. -
Page 10: Specifications
Specifications Measurement range = 1.001 to 1.999 Resolution 0.001 Calibration accuracy at 20 C 1) 5%, ref. to NPL calibration standards, can be readjusted Operating temperature 0 to 50 C Field strength at probe tip 35 kA/m Battery 9 V (PP3, Alkaline) Continuous operation with 1 battery 50 h Dimensions of electronics unit... -
Page 11: Warranty
Warranty All components of the permeability meter FERROMASTER are warranted to be free from defects in material and workmanship for a period of two years from the date of delivery to purchaser. The guarantee will apply only if the instrument is operated in accordance with this instruction manual and if the instrument is not changed by the purchaser.
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