M4-CYG1UW-TSR-M-ENG_Iss11.docx
Cygnus UW-TSR Operating Manual
71
14.
The 4 Point Check
The most frequent reasons found to cause difficulty getting
readings are:
1.
Is the Probe-membrane fitted correctly?
•
Check that there is a thin layer of oil between the membrane
and Probe-face, and with no air-bubbles trapped. See
Changing the Membrane on Page 58.
2.
Is the Probe-lead OK?
•
Check the probe lead is in good condition and is correctly
inserted into the Probe and the Gauge. See Connecting the
Probe on Page 16
3.
Is there adequate couplant applied to the material being
measured, and is the surface properly prepared?
•
Check there is plenty of couplant gel applied and there are no
air-gaps between the Probe and the material when measuring
in air. See Taking a Thickness Measurement on Page 23.
4.
Is the material measurable at all?
•
Are the front and back faces of the material parallel?
•
Is the material too heavily corroded?
•
Is the material too thin for the Probe being used? (See page
59)
It is often worth confirming that the Gauge is operating OK using a
test sample, and also to confirm that the material can actually be
measured by ultrasonic multiple-echo thickness measurement.
