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5. Probes & Membranes
The Gauge should only be used with Soft-Faced probes
supplied by Cygnus Instruments.
Cygnus Soft-Faced probes are 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.
Check the membrane regularly as it is important the membrane is
changed as soon as it shows any signs of wear.
Probe Selection
Apart from the physical limitation of the probe size, the diameter
of the probe face (crystal) and the frequency affect the probe
performance, generally:
• Large diameter probes produce more energy which gives
better performance on heavily corroded materials.
• Higher Frequency probes produce a narrower focused beam
which is better when looking for small features or on thin
materials.
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