DeFelsko PosiTector 200 v.3.1 Full Manual - Manual (Page 8)

8
The PosiTector 200 probe emits 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 in the coating to obtain the thickness of the
coating.
Ultrasonic Thickness Ultrasonic Thickness
Theory of Operation Theory of Operation
Couplant
Probe
Coating 1
Substrate
Coating 2
The PosiTector 200
interprets the largest
“echo” within the
selected range as the
coating/coating or
coating/substrate echo.
How to Measure How to Measure
1. Remove the protective rubber cap from probe.
2. Power-up Gage by pressing the center navigation
button.
3. Apply couplant (see pg. 5) 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.