Maintenance; Cleaning; Troubleshooting - PCE Health and Fitness PCE-TG 75 User Manual

9

Maintenance

9.1

Cleaning

Alcohol and thinner can damage the housing, especially the display. Therefore, only clean the
meter w ith a damp cloth.
9.2

Troubleshooting

Very thin material
With any ultrasonic thickness gauge, measurement errors occur when the thickness of the
material being tested is smaller than the low er limit of the probe. When measuring ultra-thi n
materials, an error called "double refraction" sometimes occurs, where the measured value is
tw ice the actual thickness. Another error is called "pulse envelope and loop jump" w here the
measured value is higher than the actual thickness. To avoid such errors, repeat the control
measurement of critically thin material.
Rust stains and corrosion
Rust stains and corrosion pits on the surface to be measured w ill cause the readings to change
irregularly or not at all in extreme cases; in addition, small rust stains are sometimes difficul t to
detect. If pits (blow holes) are found or suspected, be careful when measuring this area and place
the silver line of the probe at different angles for several tests.
Incorrect material identification
If you have calibrated the instrument w ith one material and use it to test another material, an
incorrect result w ill be displayed. Make sure to select the correct sound velocity. If the sound
velocity in the current test has some deviation from the calibration, errors may also occur. Make
an adjustment w hen using it.
Probe abrasion
The surface of the probe is made of acrylic resin. After prolonged use of the meter, the roughness
of the probe surface increases, resulting in a decrease in accuracy. If the user can detect
measurement errors caused by this, the probe surface can be polished with a little bit of sandpaper
or 500 grit grindstone to smooth the surface and ensure parallelism. If the result is still incorrect,
you may need to replace the probe.
Lam inated material, composite material
It is not possible to measure uncoupled laminated materials because ultrasonic w aves cannot
penetrate the uncoupled space. Since ultrasonic w aves cannot be transmitted at a constant
velocity in composite materials, measuring instruments that measure thickness by ultrasoni c
reflection are not suitable for measuring laminated and composite materials.
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