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Suzhou Meimei Electromechanical Co., Ltd
German Fischer Coating Thickness Gauge Standard Operating Guide
Date: 2025-12-23Read: 12
The German Fischer coating thickness gauge is a precision instrument used for non-destructive measurement of the thickness of non-magnetic coatings on metal substrates or metal coatings on non-metallic substrates. It is widely used in fields such as automotive manufacturing, ship anti-corrosion, aerospace, building decoration, and quality inspection. The measurement principles mainly include magnetic induction method (Fe based) and eddy current method (NFe based). If used improperly, data distortion may occur due to substrate interference, curvature effects, or missing calibration. Mastering the scientific and standardized operation method of the German Fischer coating thickness gauge is the key to ensuring accurate measurement.
1、 Preparation before use
Check the substrate type: Confirm whether the tested material is ferromagnetic (such as steel) or non-magnetic (such as aluminum, copper), and select the corresponding measurement mode;
Check surface condition: clean and free of oil stains, rust, dust, or rough protrusions to avoid misjudgment of local thickness;
Calibration zero point and standard plate:
Zeroing on uncoated substrates of the same material (eliminating substrate differences);
Use at least two standard films of known thickness (such as 50 μ m and 150 μ m) for multi-point calibration to improve linear accuracy.
2、 Standardize measurement operations
Vertical fit: The probe should be lightly pressed vertically onto the measured surface to avoid tilting and causing magnetic/eddy current distribution deviation;
Avoid edges and welds: The distance between the measuring point and the edge should be ≥ 10mm, away from structural interference areas such as rivets and welding points;
Multiple averaging: Measure 3-5 times in the same area, remove outliers and take the mean to improve repeatability (typical accuracy ± (1-3%)).
3、 Response to special working conditions
Surface measurement: For small diameter pipe fittings, a dedicated small probe (such as Φ 6mm) should be used, and a surface calibration plate should be used for calibration;
Thin substrate: When the substrate thickness is less than 1mm, there should be no metal support on the back to prevent signal penetration interference;
Multi layer coating: Ordinary thickness gauges only measure the total thickness. If layer analysis is required, a model with spectral analysis function should be selected.
4、 Instrument maintenance and storage
The probe should avoid collision and falling to prevent damage to the internal coil;
When not in use for a long time, remove the battery and store it in a dry and dust-proof box;
Send it to a metrology institution for verification every 6 months to ensure compliance with JJG480 or ISO2178/2360 standards.