06 / Concrete & mortar
Floor and waterproof coatings
DR200A uses ultrasound to check coatings on concrete or cement mortar, including floor and waterproof layers.
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Applications & Technology
Choose the method that fits the material.
From vehicle paint and protective coatings to pipe walls and optical films, begin with the material, the property you need to measure and the expected range.
Eight inspection tasks. The right instrument for each.
These examples pair a Dongru instrument with the surface and property it is designed to inspect. Check the substrate, measuring range and probe access before selecting a model.
01 / Automotive inspection
Check paint on steel and aluminum panels.
Compare readings across neighbouring panels to identify areas that may have been repaired or recoated. A dual-mode gauge switches between magnetic induction for steel and eddy current for non-ferrous metal.
- Measure
- Paint and coating thickness
- Consider
- Substrate recognition, range and access to curved panels
02 / Structural steel
Check thick protective coatings on steel.
Fire-resistant coatings and heavy anticorrosive layers can be far thicker than vehicle paint. DR15A is intended for thick coatings on ferrous metal, with a 0.1–15 mm range.
- Confirm the coating type and specified dry film thickness.
- Use a probe and range appropriate for the coating.
- Record readings across representative areas of the structure.
03 / Electronics production
Measure conformal coating on a conductive PCB area.
DR370A uses eddy current measurement for non-conductive conformal coatings over a suitable conductive base. Probe placement and available test area matter on a populated board.
- Measure
- PCB coating thickness, 0–1250 µm
- Consider
- Accessible conductive area of at least 12 mm diameter
04 / Pipes & vessels
Inspect a metal wall from one side.
Ultrasonic pulse-echo measurement helps assess pipe, vessel and ship-hull wall thickness without cutting the part. DR87A offers a through-coating mode for compatible conditions.
- Measure
- Remaining metal wall thickness
- Consider
- Sound velocity, coupling, coating and curvature
05 / Glass & window film
Check visible light transmission.
DR81 measures visible light transmission through glass, acrylic and film. Use it when the question is how much visible light passes through a sample; haze and gloss need different instruments.
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More applications
Other surfaces call for other measurements.
Concrete coating thickness, optical haze and surface gloss each require their own measurement principle.
07 / Optical clarity
Film and plastic haze
DR-W300 measures haze on suitable transparent film, plastic and glass samples.
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08 / Finished surfaces
Paint and material gloss
DR60A checks surface gloss on finishes such as paint, plastics, stone and paper.
Explore DR60ATechnology guide
Start with the measurement principle.
These methods answer different questions. Confirm the substrate, surface condition and instrument specification before applying a reading to an acceptance decision.
Magnetic induction
Non-magnetic coating thickness on a ferrous base, such as paint on steel.
Eddy current
Non-conductive coating thickness on a conductive non-ferrous base, such as anodized aluminum.
Ultrasonic pulse-echo
Wall thickness from the travel time of sound through the material, with access from one side.
Optical measurement
Transmission, haze or gloss measured with the instrument and geometry appropriate to the property.
Need to specify a measurement?
Discuss your applicationTell us the material, layer and expected range.
Include the inspection location and whether results must be recorded. We can help narrow the suitable method and instrument family.