Checkline TI-25DL - Manual (Page 13)

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5.0 QUICK START INSTRUCTIONS — STEEL THICKNESS
These Quick Start procedures are intended for those applications where the
thickness of steel is to be measured. If a material other than steel will be
measured, the gauge must be calibrated for use on this particular material.
Refer to Sections 6.0 through 8.0 for additional details.
Quick Start Instructions
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 drop of coupling fluid on the built-in Probe Zero Plate.
4. Grasp the probe and place it on top of the Probe Zero Plate.
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 display will show some thickness value and the Stability Indicator
will have most of its bars illuminated.
6. While keeping the probe on the Probe Zero Plate, press the key.
The display will show a value that can be recorded for future use.
7. Remove the probe from the Probe Zero Plate. The gauge is now ready to
perform thickness readings on steel samples.
8. Place a small amount of coupling fluid on the steel surface to be
measured and proceed as explained in step #4 above.
9. The gauge will display the thickness of the steel wall along with the
Stability Indicator showing the relative stability of the reading. If fewer
than five (5) bars are illuminated, the thickness reading displayed is most
likely inaccurate.
Notes
a. When the probe is removed from the sample after a measurement, the
last reading will be retained on the display.
b. 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
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9.0 MEASURING PROCEDURE
After setting the TI-25DL for the correct acoustic velocity, or retaining the
factory-set acoustic velocity for Common 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 and place it on top of the material surface.
Apply moderate pressure to the top face 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.
9.1 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-25DL 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