MITECH mt180, User Manual

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mvip@mitech-ndt.com
1 Overview
The model MT180/MT190 is a multi-mode ultrasonic thickness gauge. Based on the same operating
principles as SONAR, the instrument is capable of measuring the thickness of various materials with
accuracy as high as 0.1/0.01 millimeters.
The multi-mode feature of the gauge allows the user to toggle between pulse-echo mode (flaw and pit
detection), and echo-echo mode(eliminate paint or coating thickness).
1.1 Product Specifications

Display
：
4.5 digits LCD with EL backlight.

Range
：
Pulse-Echo mode: (0.65
～
600)mm (in Steel).

Echo-Echo mode: (3
～
30)mm for MT180, (3
～
60)mm for MT190.

Sound Velocity Range: (1000~9999) m/s.

Resolution
：
0.1mm/0.01mm

Accuracy
：
±
（
0.5%Th0.01
）
mm, depends on materials and conditions

Storage
：
Memory for up to 20 files (up to 99 values for each file) of stored values.

Power Source
：
Two “AA” size, 1.5 Volt alkaline batteries. 100 hours typical operating time (EL
backlight off).

Communication
：
USB1.1.

Outline dimensions
：
150mm×74mm×32 mm.

Weight
：
245g
1.2 Main Functions

Multi-mode: Pulse-Echo mode and Echo-Echo mode.

Capable of performing measurements on a wide range of material, including metals, plastic,
ceramics, composites, epoxies, glass and other ultrasonic wave well-conductive materials.

Transducer models are available for special application, including for coarse grain material and high
temperature applications.

Probe-Zero function, Sound-Velocity-Calibration function

Two-Point Calibration function.

Single point mode and Scan mode. Seven measurements readings per second in single point mode,
and sixteen per second in Scan Mode.

Coupling status indicator showing the coupling status.

Units: Metric/Imperial unit selectable.

Battery information indicates the rest capacity of the battery.

Auto sleep and auto power off function to conserve battery life.

Optional software to process the memory data on the PC.
1.3 Measuring Principle
The digital ultrasonic thickness gauge determines the thickness of a part or structure by accurately
measuring the time required for a short ultrasonic pulse generated by a transducer to travel through the
thickness of the material, reflect from the back or inside surface, and be returned to the transducer. The
measured two-way transit time is divided by two to account for the down-and-back travel path, and then
multiplied by the velocity of sound in the material. The result is expressed in the well-known relationship
2
t v
H


Where
：
H
－
Thickness of the test piece.
v
－
Sound Velocity in the material.
t
－
The measured round-trip transit time.
1.4 Configuration
Table 1-1