User Manual
User Manual
Ultrasonic Thickness Gauge and Meter
|
D1140772 • D1141137
Ultrasonic Thickness Gauge and Meter
|
D1140772 • D1141137
ULTRASONIC THICKNESS GAUGE AND METER | D1140772 • D1141137
- 12 -
ULTRASONIC THICKNESS GAUGE AND METER | D1140772 • D1141137
- 13 -
The size & sound velocity of the material being measured will change as the temperature changes.
When the accuracy of your measurement is critical, take 2 measurements from 2 different samples
of the material under the same temperature to determine the most accurate reading. When taking
measurement for steel parts in high temperature, this method may be adopted to obtain the correct
reading.
4.7. Influence of Temperature on the Material being Measured
4.8. Materials that induce acoustic absorption
4.10.
4.11. Selecting a transducer
4.9. Reference Calibration Piece
To calibrate the device, a known thickness or sound velocity of the material is necessary. When
calibrating you must use either the sample Calibration piece or a calibration piece of your own that
has a known thickness and/or sound velocity. This Ultrasonic Thickness Gauge comes with a 4.0mm
calibration piece attached to the front. It can be removed for use, and please refer to the calibration
diagram on how to calibrate.
The supplied calibration piece may not be adequate when measuring different materials. The
supplied calibration piece is great for measuring steel, however you will require additional
calibration pieces that match your application to get the most accurate readings. After calibrating
to the calibration piece, the effects of variation of sound velocity will be minimized. To achieve the
best accuracy having a set of calibration pieces of varying weights is useful to keep handy depending
on your application. However, generally, using one calibration piece will generate an accurate
measurement.
The calibration piece should be made of the same material and ideally the same thickness as the
parts to be tested. First take a reading of the thickness of the calibration piece using a micrometer.
When measuring thin material that has a thickness that is close to the minimum limit range of this
unit, please use a calibration piece to define the exact limit of the measured material (1.2mm for
steel). Do not measure any material that has a thickness under the minimum limit.
When the material to be measured is a complex alloy in a large size use a calibration piece that has a
similar thickness and similar material if possible.
Most metals have different molecular structures depending on the composition, therefore the sound
velocity will be slightly different. To achieve an exact reading, the calibration piece should have a
similar structure as the measured material if possible.
Attempting to measure materials that are porous or made of fiber or granular in composition will
cause acoustic dispersion making it difficult attain accurate readings and not suitable for use with
this type of Ultrasonic Thickness gauge.
The transducer might become worn after heavy use and this will affect the measurements.
When the following occur, please replace the transducer:
A.
The reading remains the same when measuring varying thicknesses.
B.
You achieve a reading without taking any measurements.
ITEM
Characteristic
Range
Operation temperature
5MHz ø10mm
General-purpose
1.00mm to 300.0mm(steel)
-10 to 60°C
5MHz ø6mm
Thin workpeice
1.00mm to 50.0mm(steel)
-10 to 60°C
2.5MHz ø10mm
General-purpose
1.00mm to 300.0mm(steel)
-10 to 60°C
You can check the most common sound velocity on the tables provided in this manual and use in the
place of taking calibration for calibration piece. However, please note that this is simply a close guide,
and occasionally the sound velocity will differ caused by different physical / chemical factors. The
sound velocity of mild steel is adopted on the reference table.
This Ultrasonic Thickness Gauge has the function to measure the sound velocity, so the velocity
can be obtained prior to measuring the thickness. Once Sound velocity has been measured, you can
proceed with measuring the thickness.
