Hello, my name is Nina Giombetti
and I’m a sales engineer for Olympus Ultrasonic Thickness Gages.
Today, we are going to discuss
how to calibrate the 38DL PLUS
with one of our Thru-Coat Dual Element transducers,
the D7906 or the D7908.
These transducers are specifically designed
to measure the remaining wall thickness
of pipes and tanks where the external surface
maybe painted or coated.
The unique feature about Thru-Coat
is that it can display thickness of the coating
and the thickness of the steel at the same time
and does not require multiple backwall echoes in the steel to exist
to give you a true metal thickness.
To activate the Thru-Coat software
simply plug in a D7906 or D7908
dual element series transducer.
The 38DL PLUS will automatically recognize
the transducer and will prompt us to perform a Do-Zero.
This is done by wiping the couplant
off the tip of the probe
and pressing the 2nd FUNCTION and CAL ZERO key.
At this point the user will be prompted
whether or not they want to enable the Thru Coat feature.
You can now use the left or right arrow key
to select Yes or No.
In this application we are going to select yes
and press the ENTER key.
At this point we are now ready to calibrate
the 38DL PLUS in Thru-Coat mode.
In this example, I am going to be calibrating
to a five step carbon steel test block
where the maximum thickness is five hundred thousandths (inch)
and the minimum thickness is one hundred thousandths (inch)
with one hundred thousandths steps in between.
The test block does not have to have a coating on it
in order to calibrate for the steel in Thru-Coat mode.
Simply couple to your thick standard,
in this case the five hundred thousandths step,
and press the CAL VEL key.
Once we have a steady reading
press the ENTER key.
Then use the right, left, up or down arrow keys
to enter in the known thickness of the standard.
Then proceed to the thin standard,
couple on, and press the CAL ZERO button.
Once we have a steady reading
press the ENTER button
and then use the up or down, or left or right arrow keys
to enter in the known thickness value.
At this point if we do not wish to calibrate
for the velocity of the coating
press the MEASURE key to complete the calibration.
If we choose to calibrate
for the velocity of the coating
we will need a sample of known coating thickness.
In this case we are going to use a thin piece
of a plastic shim on top of a test block
to simulate a coating.
Couple the plastic shim to your thick standard
and press the CAL VEL key.
Then press the ENTER key
and use the right, left, up or down arrow keys
keys to enter in the known thickness of the coating.
In this case it is twenty thousandths (inch).
Now press the MEASURE Key
to complete the calibration.
We can now go back to the calibration block
and check the reference steps.
One hundred thousandths,
Two hundred thousandths,
Three hundred thousandths,
Four hundred thousandths,
Five hundred thousandths.
Now we can go back and check the steps
with the coating sample to make sure the measurements are correct.
Five hundred thousandths,
Four hundred thousandths,
Three hundred thousandths,
Two hundred thousandths,
One hundred thousandths.
This completes the calibration for
the Thru-Coat feature with the 38DL PLUS.
For more information please visit our website
at www.olympus-ims.com
or contact you local sales representative.