Checkline TI-CMXDL - Manual (Page 26)

2. Assuming the TI-CMXDL recognized the probe and the OK
key was pressed, the TI-CMXDL will advance to a Zero Probe
menu. If the transducer was identified as a special transducer
capable of measuring coating thickness, a menu will be
displayed allowing the user the ability to toggle the coating
thickness display on/off as follows:
3. Press the UP and DOWN arrow keys to toggle the coating
option on/off.
4. Wipe all couplant from the transducer face and proceed to the
Probe Zero section that follows.
In this second example the transducer was not identified and will force the user to select
the transducer type from a predefined list of transducers:
1. Press the OK or ESC keys to display the factory list of
transducer types (by diameter and frequency).
2. Press the UP and DOWN arrow keys to scroll through the
transducer list until the appropriate type is highlighted.
3. Press the ENTER key to select the transducer type and
display overwrite existing probe screen.
4. Press the OK key to overwrite the existing probe type with
the newly selected probe type. The zero probe screen will be
displayed. Proceed to the zero probe section that follows.
6.2 Probe zero
The next step is to perform a probe zero. The zero function is
a very important and necessary function that must be done prior
to calibration. It should be done on a regular basis. In fact, the
TI-CMXDL has been programmed to force this issue at regular
intervals during operation if it hasn’t been done. If the TI-
CMXDL is not zeroed correctly, all the measurements taken may
be in error by some fixed value. When the TI-CMXDL is using
the auto zero (electronic zero), the TI-CMXº can be in any meas-
urement mode. However, when the manual zero is being used, the TI-CMXDL must be in
pulse-echo mode in order to perform the zero. The TI-CMXDL will also see to it that this
occurs bysimply forcing the gauge into this mode when zero. Therefore, if the TI-CMXDL
is in the echo-echo measurement mode and a manual zero is being performed, the TI-
CMXDL will put the gauge into pulse-echo mode automatically before performing the
zero. While this is a very convenient feature of the TI-CMXDL, the user should be sure to
check the measurement mode following calibration to be sure the TI-CMXDL is in the
desired mode. The following steps outline both of these techniques.
The TI-CMXDL is equipped with two zero options:
1. Off Block Zero (Automatic Probe Zero) – When this feature is enabled the
TI-CMXDL will do an electronic zero automatically, eliminating the need for a zero
disk or block.
2. On Block Zero (Manual Probe Zero) – When this feature is enabled the transducer
must be placed on the probe zero disk (battery cover located on the top of the unit.
Both zero procedures are outlined as follows
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One Point Calibration
NOTE: Use the maximum coating sample for the one point calibration first.
1. Physically measure the thicker of the two samples of coating, as close as possible to
maximum expected coating measurement range, using a set of calipers or a digital
micrometer.
Very Important: If coating measurements will be made with the coating applied to a
metal surface, the calibration must be done in the same manner, with the samples couple
to a metal surface. However, if the coating will be measured as a stand alone material, th
calibration must be performed the same way.
2 Apply a drop of couplant on the transducer and place the transducer in steady contac
with the thicker of the two coating and samples fist. Be sure that the reading is stable
and the repeatability indicator, in the top left corner of the display, is fully lit and stab
Press the MENU key once to activate the menu items tab. Press the MENU key multi
times to tab right and the ESC key multiple times to tab left until the CAL menu is
highlighted and displaying the submenu items.
3. Use the UP and DOWN arrow keys to scroll through the sub
menu items until COATING 1PT is highlighted.
4. Press the ENTER key to display the Digits Edit Box.
5. Press the UP and DOWN arrow keys to scroll the highlighted
value.
6. Press the LEFT and RIGHT arrow keys to scroll the digit
locations.
7. Repeat steps 5 & 6 until the known thickness value is correctly
displayed.
8. Press the OK key to calculate the velocity and return to the menu screen, or ESC to
cancel the coating one point calibration.
9. Finally, press the MEAS key to return to the measurement screen and begin taking
readings.
Two Point Calibration
NOTE: Use the minimum coating sample for the two point calibration.
1. Physically measure the thinnest of the two samples of the
coating, as close as possible to the minimum expected coating
measurement range, using a set of calipers or a digital
micrometer.
Very Important: If coating measurements will be made with the
coating applied to a metal surface, the calibration must be done in
the same manner, with the samples coupled to a metal surface.
However, if the coating will be measured as a stand alone material,
the calibration must be performed the same way.
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