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8.0MEASURING PROCEDURE
After setting the TI-25M for the correct acoustic velocity, or retaining the
factory-set acoustic velocity for steel, the gauge is ready to take wall thickness
measurements.
1. Turn on the power by pressing the key.
2. Plug the probe cable into the receptacle at the top of the gauge.
3. Place a small amount of coupling fluid on the surface to be
measured.
4. Grasp the probe by the molded rubber grip and place it on top
of the material surface. Apply moderate pressure to the top
surface of the probe with your index finger or thumb to
stabilize the probe and to keep the wearface seated flat against
the measurement surface.
5. The gauge will display the thickness of the steel wall along with the
Stability Indicator showing the relative stability of the reading.
6. Repeat steps #3 - #5 as required.
8.1 General Notes On Measurements
1. When the probe is removed from the sample after a
measurement, the last reading will be retained on the display.
2.If fewer than five (5) bars of the Stability Indicator are illuminated,
the thickness reading displayed is most likely inaccurate.
3. Occasionally, a small film of couplant will be drawn out between
the probe and the surface as the probe is removed. When this
happens, the TI-25M may perform a measurement that is larger or
smaller than it should be. This phenomenon is obvious when one
thickness value is observed while the probe is in contact with the
material, and another value after the probe is removed.
4. The gauge will automatically power off after 5 minutes of non-use.
5. The following surface conditions can prevent accurate
measurements (refer to section 4.6 Preparation Of The Surface):
• More than 0.020" (20 mils or 500 µm) of paint or other coating
• Flaking or loosely adhered coatings
• Rough or heavily pitted surface
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