How To Measure - DeFelsko PosiTector 200 Guide D'utilisation

PosiTector 200 - Theory of Operation
PosiTector 200 probes emit a high frequency sound pulse that
travels into the coating via a coupling gel and reflects from ANY
surface that is different in density. Coating thickness readings are
obtained by measuring the time taken for the ultrasonic signal to
propagate from the probe to the coating/substrate interface and
back. The travel time is divided by two and multiplied by the
velocity of sound for the coating to obtain the thickness of the
coating.
Coating 1
Coating 2
Substrate
1. Remove the protective rubber cap from probe.
2. Power-up Gage by pressing the center navigation
3. Apply couplant (pg. 2) to the surface
of the part.
4. Place the probe FLAT on the surface
and press down.
5. Lift the probe when you hear a double
BEEP, - OR - leave probe on the surface
in the same location for continuous
measurements.
6. When completely finished, wipe the probe clean of couplant
then return the Gage to the protective pouch. There is no
need to disconnect the probe from the PosiTector during
storage.
Verify accuracy (pg. 4) at the beginning and the end of each shift,
or if the gage is dropped or suspected of giving erroneous
readings.
Probe

How to Measure

3
Couplant
The PosiTector 200
interprets the largest
"echo" within the
selected range as
the coating/coating
or coating/substrate
echo.
button.