Checkline TI-25M-MMX User Manual download pdf (Page 12)

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Note: The calibration function has been disabled in E-E (echo-echo) mode.

If the CAL key is pressed while in E-E mode, “nO” followed by “CAL” will

be displayed.

2. Perform a Probe-Zero (refer to page 10)

3. Apply couplant to the sample piece.

4. Press the transducer against the sample piece, making sure that the transducer

sits flat against the surface of the sample. The display should show some

(probably incorrect) thickness value, and the Stability Indicator should have

nearly all its bars on.

5. Having achieved a stable reading, remove the transducer. If the displayed

thickness changes from the value shown while the transducer was coupled,

repeat step 4.

6. Press the CAL key. The IN (or MM) symbol should begin flashing.

7. Use the UP and DOWN arrow keys to adjust the displayed thickness up or

down, until it matches the thickness of the sample piece.

8. Press the CAL key again. The IN/ms (or M/s) symbols should begin flashing.

The TI-25M-MMX is now displaying the sound velocity value it has calculated

based on the thickness value that was entered in step 7.

9. Press the CAL key once more to exit the calibration mode. The TI-25M-MMX

is now ready to perform measurements.

Calibration to a known velocity

NOTE: This procedure requires that the operator know the sound-velocity of the

material to be measured. A table of common materials and their sound-velocities

can be found on page 23.

1. Make sure the TI-25M-MMX is on and switched to P-E (pulse-echo) mode.

Press the Dual-Multi key to toggle modes.

Note: The calibration function has been disabled in E-E (echo-echo) mode. If

the CAL key is pressed while in E-E mode, “nO” followed by “CAL” will be

displayed.

2. Press the CAL key to enter calibration mode. If the IN (or MM) symbol is

flashing, press the CAL key again, so that the IN/ms (or M/s) symbols are

flashing.

3. Use the UP and DOWN arrow keys to adjust the displayed velocity up or

down, until it matches the sound-velocity of the material to be measured.

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8.0 DUAL-MULTI MODE

Often times users and inspectors in the field are faced with coated materials such

as pipes and tanks. Typically inspectors will need to remove the paint or coating

prior to measuring, or allow for some fixed amount of error introduced by the

paint or coating thickness and velocity. An A-Scan scope with a special echo-echo

mode is generally used in order to accurately perform measurements through

paints and coatings. However, In order to inspect for blind wall pitting and

internal flaws, both echo-echo (thru-paint / coatings), and pulse-echo (locate

flaws & pits) modes are needed. Special high damped dual element transducers

are also a must when performing inspections using both modes without an a-scan

scope for verification. A highly damped transducer rings for a much shorter time,

allowing the TI-25M-MMX to measure thinner material thicknesses in echo-echo

mode. This same transducer is equally effective when used in pulse-echo mode,

eliminating the need to use different transducers for each mode. The new

TI-25M-MMX gives you all these features in a simple to use, one button toggle,

digital thickness gauge. The following steps outline the procedure for setting up

this feature:

Dual-Multi Mode

1. Press ON/OFF key to power up the TI-25M-MMX.

2. Press the DUAL-MULTI key to toggle between E-E (echo-echo)

thru-paint/coatings mode and P-E (pulse-echo) flaw and pit mode.When E-E

mode is selected, the + symbol is on and blinking, this indicates that the

TI-25M-MMX is currently operating in echo-echo ( Thru-paint/coating ) mode.

See illustration below:

3. The TI-25M-MMX is now ready to perform measurements in the current

mode setting.

1.8.8.8.8

INMM/µs

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Checkline TI-25M-MMX User Manual Page 12

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