Checkline TI-25DL - Manual (Page 11)

– 11 –
4.4 Changing Units — inches to mm
The TI-25DL can be set to measure in units of “INCH” or “MM.”
The factory default setting is "INCH". To change the units of measure,
perform the following:
1. Turn on the TI-25DL power by pressing the key.
2. Press the key to activate the features and settings menu.
3. Press the or key until ... “unit.” is shown on the display.
4. Press the key to change the currently selected units of
“INCH” to “MM.” Each time the SEND key is pressed the units
will change and the corresponding indicator “IN” or “MM” will
flash on and off.
5. Press the key to store the selected units of measure and return
to measurement mode.
4.5 Checking Calibration With The Test Plate
The Probe Zero Plate can be used to confirm that the gauge is operat-
ing properly, however, there are several precautions necessary for
proper use.
1. Due to manufacturing tolerances, the thickness of the Probe Zero
Plate can vary with each gauge. Therefore, its exact thickness is not
reported, and the user must record this value when first
performing the Probe Zero Function (refer to Section 4.3).
2. The displayed thickness reading of the Probe Zero Plate will change
if the user manually changes the calibration.
4.6 Preparation Of The Surface
The TI-25DL can be used to measure thickness over existing paint or
coatings as long as the coating is in good condition, is well adhered to
– 26 –
9.3 Measurements On Materials At High Temperatures
When it is necessary to measure wall thickness on surfaces that are in
excess of 200 °F (100 °C), special-purpose high temperature probes
should be used. These probes are built using special materials and
techniques that allow them to withstand high temperatures without
damage. Additionally, care must be taken when performing a “Probe
Zero” or “Calibration To Known Thickness” using a High Temperature
probe.
At such elevated temperatures, it is recommended that the user follow
these procedures:
1. Perform a calibration procedure on a sample of known thickness
(refer to Section 6.3) with the material temperature at or near the
temperature that will be encountered during measurement.
2. Remove the probe from the hot surface immediately after a “stable”
reading is displayed. Even though the High Temperature Probes are
constructed using materials which can withstand high temperatures,
the probe can begin to heat up, through thermal expansion and
other effects, adversely affecting the accuracy of the measurement.
Note: The probe can be cooled by submerging it in water.