Checkline TI-CMXDL - Manual (Page 23)

Coating Only
The coating only mode should be used when the application calls for coating measure-
ments only and the user is not interested in the thickness of the material the coating has
been applied to. This mode can also be used as a stand alone coating thickness gauge,
where the coating has not been applied to another material surface. An auto identified
coating probe must be attached to the TI-CMXDL in order to enable this mode.
Thin materials
Use pulse echo mode and a high frequency transducer for these types of applications. Th
most common transducers are the 7.5MHz and 10MHz models with extra resolution. Th
higher frequencies provide greater resolution and a lower minimum thickness rating
overall.
High temperature
Use and select a special 2.25MHz and 5 MHz High temperature transducer for these
types of applications. Both pulse-echo and echo-echo modes will also work for these
applications. However, echo-echo mode will eliminate error caused by temperature
variations in the delay line of the transducer.
Noisy Material
Materials such as titanium, stainless steel, and aluminum may have inherent surface nois
issues. This is a signal that appears at the surface of the material when using a dual elem
delay line probe. Select a higher frequency transducer to reduce this noise – 7.5MHz an
higher for better resolution.
Restricted access
Measuring materials with extreme curvatures or restricted access, higher frequencies wit
smaller diameters should be considered. The smallest diameter uses 3/16” crystals with
contact area of .250”. Custom transducers are available on request.
5.3 Factory Setup Chart
There are no standard factory setups provided with the TI-CMXDL, as the primary reaso
for the setups is to retain all of the user adjustments made to set the gauge for use on a s
cific application. Saving a setup allows you to retain all of the settings made to tune the
gauge, such as Gain setting, 1 or 2 Point Calibration values for the Material and/or the
Coating, Acoustic Velocity setting, Alarm limits, operating mode, B-scan settings and
much, much more. Refer to section 11.0 for additional info on Setups.
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Setting the Alarm Low Limit
1. Assuming the ALARM is ON, use the UP and DOWN arrow
keys to scroll through the sub menu items until ALARM LOW
is highlighted.
2. Press the LEFT and RIGHT arrow keys to scroll the value.
When the correct alarm value is being displayed, proceed to
step 7.
3. Alternatively, press the ENTER key to display the Digits Edit
Box.
4. Press the UP and DOWN arrow keys to scroll the highlighted
value.
5. Press the LEFT and RIGHT arrow keys to scroll the digit
locations.
6. Repeat steps 4 & 5 until the ALARM LOW value is correctly
displayed.
7. If only one limit will be used, press the MEAS key to return to
the measurement screen and begin taking readings. Otherwise,
continue on to set the ALARM HIGH limit.
10.3 Differential Mode
The Differential Mode of the TI-CMXDL provides the user with the ability to set a nomi-
nal value, according to what the expected thickness should be, and measure the +/- differ-
ence from the nominal value entered. This feature is typically used in QA incoming inspec-
tions on pipes, plate stock, coils, etc. The steps below outline how to enable and enter the
nominal value to use this feature:
Toggle Differential (on/off)
1. Press the MENU key once to activate the menu items tab.
Press the MENU key multiple times to tab right, and the
ESC key multiple times to tab left, until the UTIL menu is
highlighted and displaying the submenu items.
2. Use the UP and DOWN arrow keys to scroll through the
sub menu items until DIFFERENTIAL is highlighted.
3. Use the LEFT and RIGHT arrow keys to toggle the
DIFFERENTIAL on. A value will appear to the right of
DIFFERENTIAL.
4. Continue on to the next section “Setting the Differential Value”.
Setting the Differential Value
1. Assuming DIFFERENTIAL has been enabled and a value is
being displayed to the right of the DIFFERENTIAL label,
press the ENTER key to display the Digits Edit Box.
2. Press the UP and DOWN arrow keys to scroll the highlighted
value.
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