Ultrasonic Thickness Gauge/Thickness Gauge
|FOB Unit Price:||US $200 US $190|
|Purchase Qty. (Pieces)||FOB Unit Price|
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- Model NO.: MT150
- Measurement Object: Thickness
- Material: Aluminum Alloy
- Certification: ISO, CE
- Shape: Rectangular
- Thickness Gauge: Thickness Gauge
- Transport Package: Potable Case
- Origin: Hong Kong
- Type: Gauge
- Test Methods: Ultrasonic
- Precision Gauge: Precision Gauge
- Usage: For Working, For Inspection, For Checking
- Customized: Customized
- Trademark: Mitech
- Specification: 20*30*20
- HS Code: 9031809000
Function & application
H-Thickness of the test piece.
v-Sound Velocity in the material.
t-The measured round-trip transit time.
Relative Humidity ≤90%;
The surrounding environment should avoid of vibratin, strong magentic field, corrosive medium and heavy dust.
Dual straight beam probes with different frequencies and crystal sizes are available;
Zero calibration, two-point calibration, automatic error correction system;
Known thickness, sound speed can be measured, in order to improve the measurement accuracy;
Coupling status indicator showing the coupling status;
EL backlight for easy use in dimly lit environments;
Remaining battery indicator can display the remaining power in real time;
Auto sleep and auto power off function to conserve battery life
Small, portable, high reliability for harsh operating environment, anti-vibration, anti-shock and anti-electromagnetic interference.
Operating Method and Attentions
When measuring a piece of pipe to determine the thickness of the pipe wall, orientation of the transducers is important. If the diameter of the pipe is larger than approximately 4 inches, measurements should be made with the transducer oriented so that the gap in the wearface is perpendicular (at right angle) to the long axis of the pipe. For smaller pipe diameters, two measurements should be performed, one with the wearface gap perpendicular, another with the gap parallel to the long axis of the pipe. The smaller of the two displayed values should then be taken as the thickness at that point.
Measuring hot surfaces
The velocity of sound through a substance is dependant upon its temperature. As materials heat up, the velocity of sound through them decreases. In most applications with surface temperatures less than about 100ºC, no special procedures must be observed. At temperatures above this point, the change in sound velocity of the material being measured starts to have a noticeable effect upon ultrasonic measurement. At such elevated temperatures, it is recommended that the user perform a calibration procedure on a sample piece of known thickness, which is at or near the temperature of the material to be measured. This will allow the gauge to correctly calculate the velocity of sound through the hot material.
When performing measurements on hot surfaces, it may also be necessary to use a specially constructed high-temperature transducer. These transducers are built using materials which can withstand high temperatures. Even so, it is recommended that the probe be left in contact with the surface for as short a time as needed to acquire a stable measurement. While the transducer is in contact with a hot surface, it will begin to heat up, and through thermal expansion and other effects, may begin to adversely affect the accuracy of measurements.
An additional important consideration when measuring laminates, is that any included air gaps or pockets will cause an early reflection of the ultrasound beam. This effect will be noticed as a sudden decrease in thickness in an otherwise regular surface. While this may impede accurate measurement of total material thickness, it does provide the user with positive indication of air gaps in the laminate.
Suitability of materials
Ultrasonic thickness measurements rely on passing a sound wave through the material being measured. Not all materials are good at transmitting sound. Ultrasonic thickness measurement is practical in a wide variety of materials including metals, plastics, and glass. Materials that are difficult include some cast materials, concrete, wood, fiberglass, and some rubber.
All ultrasonic applications require some medium to couple the sound from the transducer to the test piece. Typically a high viscosity liquid is used as the medium. The sound used in ultrasonic thickness measurement does not travel through air efficiently.
A wide variety of couplant materials may be used in ultrasonic gauging. Propylene glycol is suitable for most applications. In difficult applications where maximum transfer of sound energy is required, glycerin is recommended. However, on some metals glycerin can promote corrosion by means of water absorption and thus may be undesirable. Other suitable couplants for measurements at normal temperatures may include water, various oils and greases, gels, and silicone fluids. Measurements at elevated temperatures will require specially formulated high temperature couplants.
Inherent in ultrasonic thickness measurement is the possibility that the instrument will use the second rather than the first echo from the back surface of the material being measured while in standard pulse-echo mode. This may result in a thickness reading that is TWICE what it should be. The Responsibility for proper use of the instrument and recognition of these types of phenomenon rests solely with the user of the instrument.