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Measuring Non-Metals
You can measure certain types of plastics with the gauge using a
twin element probe and the gauge set to Single Echo
measurement mode. Generally the harder the plastic the better,
soft materials like rubber or TPEs tend to absorb too much
ultrasound so only thin samples can be measured.
Engineering plastics like Acetal, Tufset (Polyurethane), Nylon and
High-density polyethylene (HDPE) can be measured successfully.
Rotationally mounded parts can generally be measured
successfully.
• You must use Single Echo mode to measure plastics.
• You must generally use a low frequency probe (i.e. T2C) to
measure plastics, but this will depend on the properties of the
material.
• Any material with a closed-cell construction cannot be
measured.
• Any material with internal voids, air bubbles or honeycomb
cannot be measured.
Typically these materials cannot be measured with the gauge;
• Concrete
• Wood
• Thermal insulation materials
• Foams
• Composites
Single Element Probes and Protective Membranes
All Cygnus single element probes have a soft face and are
therefore fitted with a Polyurethane Membrane which provides
better contact on rough surfaces and protects the probe face from
wear, prolonging the life of the probe.
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