MFD500B Ultrasonic Flaw Detector





Measuring range:

0 ~9999 at steel velocity

Resolution Accuracy:

Horizontal: +/-0.1% FSW, Vertical: 0.25% FSH, Amplifier Accu

Communication storage:

USB2.0;100 groups of flaw detecting parameters channels;1000

Working time:

more than 8 hours

Main unit weight:




Package dimensions:


Total weight:



  • Overview
  • Graphic
  • Technical
  • Configuration
  • Related


  • Overview
  • Graphic
  • Technical
  • Configuration
  • Related
  • Product Overview

      Based on ultrasonic principle, digital ultrasonic flaw detector MFD500B with 320*240 TFT LCD, it can test, orient, evaluate and diagnose various flaws such as crack, lard, air hole in workpiece’s interior swiftly and accurately without any destruction. It can be used in Laboratory as well as in engineering filed. With range of 0-9999mm, it can meet the requirement for general defect inspection in manufacturing industry, metallurgical industry, metal processing industry, chemical industry and so on. Low power design with large capacity and high performance lithium battery module, it can be long standby for months. High quality with low price, it is the first choice for the practical economic model for ultrasonic testing equipment.

    Function & application

    The instrument can be widely used in locating and sizing hidden cracks, voids, disbands and similar discontinuities in welds, forgings, billets, axles, shafts, tanks, pressure vessels, turbines and structural components.

    Working Principle

    When presence of a defect in a workpiece with homogenous material, due to the defects, it will inform the interface among different mediums between the defect and workpiece. As the acoustic resistance is different at the interface, after the pulsing ultrasonic wave met the interface, it will produce reflection. The reflected energy will be received by the probe. Then it will show a reflection waveform in a certain abscissa position in the display screen which is the defect depth in the workpiece. The height and shape of reflecting wave would be different caused by the different defects which reflect the defect’s character.

    Working Conditions

    Operating Temperature: -10 to 50;

    Storage Temperature-30 to 50

    Relative Humidity: (20 ~ 95)% RH

    The surrounding environment should avoid of vibrating, strong magentic field, corrosive medium and heavy dust.

    Instrument Features

    Gate Alarm

    Gate position, gate width and gate height can be adjustable at will. The B gate can chose to set wave-getting alarm or wave-losing alarm. The beep in gate and LED light can be alarmed or closed (the LED light alarm is very effective under the noise environment).

    Data Storage

    The instrument is built with mass storage, the data and files will not be lost because of instrument power breakdown. The storage contents included channel parameters, waveform pictures and video files. It supports 100 groups of flaw detecting parameters channels. It can preset well for the combination parameters of various types of probes and instruments as well as set testing standards for each industry freely. It can save 10000 pictures of detecting echo signals and parameters. It can realize to save, read and transfer the data via the USB port.

    Video Function

    The instrument supports for saving the inspection process as video file and save it to the internal storage card. Video file can be replayed through the instrument. The instrument can support 2 minutes video. 


    Record and save the tracking record of detecting date and time in real time.


    With USB2.0 high speed communication interface, it also can use special software to upload and download data through the USB port.

    Battery Module

    The large capacity lithium battery module is easy to be assembled and disassembled. It can be charged independently but also charged by inserting wire. Its continuously working time is more than 10 hours.  

    Operating Method and Attentions

    Simple Operation Way:

    1. Connect the probe to instrument with probe cable

    2. Power on the instrument

    3. Choose the channel and clear the present channel

    4. Calibration the probe

    Straight Probe: P-Delay

    Angle Probe: P-Delay, X-value, Angle

    5. Make AVG curve (straight probe), DAC curve (angle probe)

    6. Choose the function setting

    7. Detecting flaw in the workpiece

    8. Record the flaws

    9. Power off the instrument after operation


    1. During pressing key operation, please not be too hard. Please not use the hands with much oil or mud for operating the instrument keypad to avoid affecting the keypad working life.

    2. Please clear the instrument cover after operation

    3. Please keep the instrument in a dry and clean place

    4. Please avoid oil, water or other liquids into the instrument and clean the instrument surface regularly.

    5. Make sure not twist or press the probe cable, communication cable and power cable. Please grasp the plug root during inserting or pulling the cable. Don’t grasp the cable for pulling or inserting.

    6. Please make sure the standard battery for working power adapter for charging. Otherwise, the instrument would be damaged easily.


    Instrument Maintenance

    1. Care of the Instrument

    Clean the instrument and its accessories using a moist cloth. Only use the following recommended instrument cleaners: water, a mild household cleaner or alcohol (no methyl alcohol).


    Do not use any methyl alcohol, solvents, or dye penetrated cleaners!

    The plastic parts can be damaged or embrittled by these.

    2. Care of the Batteries

    Capacity and life of batteries mainly depend on the correct handling. Please therefore observe the tips below.

    You should charge the batteries in the following cases:

    Before the initial startup

    After a storage time of 3 months or longer

    After frequent partial discharge

    3. Maintenance

    The instrument requires basically no maintenance.


    If the accident occurred during instrument using, the instrument will be abnormal which means the instrument will not be able to use. Please turn off the instrument connection with the battery by putting the battery switch to off. Then, power on the instrument again after waiting one minutes to see if it is back to normal.

    We provide two year’s warranty and life-long maintenance to the instrument. Please kindly contact with our company or agent for instrument repair. Please don’t disassemble the instrument by yourself without our agreement.


  • Display Resolution (320×240 pixels) full digital TFT LCD
    Blind Area 5MM
    Flaw Sizing Automatic flaw sizing using AVG/AVG or DAC, speeds reporting of defect acceptance or rejection
    Weld Figure Feature Weld Figure feature can be enabled when detecting the weld parts using angle transducer
    Auto-Calibration Automated calibration of transducer zero offset and/or material velocity
    Memory be able to store, recall the A-Scan patterns and instrument settings
    Flaw Locating Live display Sound-path, Projection (surface distance), Depth, Amplitude
    Defect Quantification directly display the result with db unit
    Defect characterization calculate the equivalent size of the flaw easily and quickly to facilitate the judgment of artificia
    Curved Surface Correction used to measure the surface distance and depth of defect on a curved surface
    AWS D1.1 one of the AWS(American Welding Society) standards
    Crack Height Measuring measure and display the height of a crack found inside the workpiece
    Magnify Gate spreading of the gate range over the entire screen width
    Video Recording more than 10 minutes
    A Scan Freeze Display freeze holds waveform and sound path data
    Coded Echo Color locate the flaw position
    B-Scan display a graphical cross-section of the workpiece
    Power-Saving Method low power consumption
    Protection Level IP54
    Communication Interface High Speed USB2.0 port
    DataPro Software Y
    Working Language freely switch between Chinese and English
    Total Weight 6.0KG
    Measuring Range (0 ~9999) mm at steel velocity
    Bandwidth 0.5 to 15MHz automatic matching according to the probe frequency
    Material Velocity (1000~ 9999) m / s
    Dynamic Range ≥ 36dB
    Vertical Linear Deviation ≤ 3.0%
    Horizontal Linear Deviation ≤ 0.2%
    Resolution > 40dB (5P14)
    Sensitivity Leavings >60dB (flat-bottomed deep hole 200mmФ2)
    Rejection (0 to 80)% Linear without affecting the linearity and gain
    Noise Level ≤ 10%
    Probe Type straight beam probe, angle beam probe, dual element probe, through-transmit probe
    Gates Wave-getting Gate, Wave-losing Gate, Single Gate Reading, Dual Gate Reading
    Alarm Beep Alarm and LED light Alarm
    Power Supply DC 9V
    Working Time >10 hours
    Overall Dimensions 263 × 170 × 61(mm)
    Operating Temperature (-10 ~ 50) ℃
    Relative Humidity (20 ~ 95)% RH
    Pulse Energy Low (300V), Medium (500V) and High (700V) selectable, suitable for various probe
    Pulse Width (0.1~0.512)µs range with continuous adjustment to match the different frequency probes
    Probe Damping 100Ω、200Ω、400Ωselectable to meet different requirements for resolution and sensitivity
    Sampling 10 digits AD Converter at the sampling speed of 160MHz, waveform of highly fidelity
    Rectification Positive half wave, negative half wave, full wave, RF
    Gate Reading optional for single gate and double gate reading mode, peak readings within the gate
    Gain 0 dB to 110 dB adjustable in selectable steps 0.1 dB, 1 dB, 2dB and 6dB
    Transducer Connections BNC or LEMO
  • B Series Power Adapter
    B Series Power Adapter of Mitech Ultrasonic flaw detector, the standard configuration of B series products with 9V voltage and 4A current, It is used for instrument charging. During charging, it will produce the constant voltage which can effectively protect the instrument, easy to use, safe and reliable. This instrument is only limited to the use of our company's special battery pack and power adapter (charger), otherwise it may cause damage to the instrument.
    Straight Probe
    Mitech standard Straight Probe with the parameters of 4MHz, 10mm is the standard configuration of Mitech series ultrasonic flaw detectors. It is mainly composed of the piezoelectric crystal, damping block and protective film. The ultrasonic wave is emitted from the piezoelectric crystal, through the protective film and couplant enter into the measured workpiece. So for the straight probe, the actual distance of ultrasonic transmission is equal to the workpiece thickness plus protective film and couplant.  So the straight probe should be calibrated before using to remove the distance between the protective film and the couplant to reduce the error caused by them and improve the measurement accuracy. The Straight Beam Probe is suitable for flaw detecting of larger parts with various shapes like forgings, castings and so on. 
    Angle Probe
    Mitech standard Ultrasonic flaw detector Angle Probe with the parameters of 4MHz 8*9, 60°is the standard configuration. It is mainly composed of the piezoelectric crystal, damping block and wedge. The ultrasonic wave emitted from the crystal, through the wedge, it is converted to the transverse wave, and then incident to the measured workpiece. The wedge is made of organic glass, which can realize the waveform transformation. In order to avoid errors in calculating the defect distance, before using the angle probe, we need to calibrate its P-delay, angle and forefront. Through calibration, this part of the error can be automatically subtracted, thus improving the measurement accuracy .The Angle Beam Probe is suitable for normal flaw detecting like welds. 
    Single Probe Cable
    The single cable for Mitech ultrasonic flaw detector, with standard length of about 20cmm, BNC/LEMO-LEMO00 probe cable is the standard configuration of the instrument, used for connecting the main unit with the probe. 
    Battery Module MB-02
    Mitech B series products of Ultrasonic flaw detector have internal rechargeable Li-ion battery pack rated 7.2V at 8800 mAh,is the standard configuration.When using ,don't disassemble ,and only for supplied charger ,otherwise ,the battery will be damaged .If it’s not used for a long time, be sure to regularly charge and discharge(about once a month), so as to avoid failure. 
    Power Cable
    Power Cable of Mitech Ultrasonic flaw detector with length about 140cm, it is used for the connection between the main unit and power adapter. There are GB standard power cable, European standard power cable, British standard power cable, the United States power cable for selection. 
    ABS Instrument Case
    The ABS instrument case for Mitech Ultrasonic flaw detector with length of 42cm, width of 30cm, height of 8.5cm, designed with ABS engineering plastic, It has excellent performance like waterproof, shockproof, excellent heat resistance and low temperature resistance. It can effectively prevent oil, dust and corrosion in harsh environment. Its size in line with the standards for aviation and train carrying (capable of putting under the seat and on the luggage rack), it is safe, reliable and stable.
    Support Pillar
    The B seris support pillar, the standard configuration for MFD B series products, with length of 9.5cm, it’s used to support the instrument. 

    Data processing software
    Data Pro Software, the standard configuration of Mitech ultrasonic flaw detector, which has the functions of data management, graphic display, parameter setting, report printing, file management and so on. It is suitable for storing and managing the non-destructive flaw detecting report. With the analysis results provided by the software, it can make enterprise quality control more scientific basis and higher traceability. Improving the quality of enterprise information management level is the effectively guarantee for enterprise analysis the product qualification rate and improve the quality monitor. The software can also be used as effective tools in scientific research units related with metal materials, manufacturing plants, universities and other departments engaged in theoretical teaching, experimental analysis and basic scientific research
    USB Communication Cable
    The  USB Communication Cable of Mitech Ultrasonic flaw detector, with length about 150cm, it is used for connecting the instrument with PC to realize the application of communicating with PC, analyzing and storing the data as well as printing the inspection reports.
    Attached files
    The Mitechs Ultrasonic flaw detector with customized packing documents has included product certificate, warranty card, product manual and packing list. The packing documents had used the special printed paper. The manual is with graphic design, beautiful, easy to understand, easy to save for a long time.
    Note: The electronic version of the packing documents for Mitech series products can be downloaded from www.mitech-ndt.com.
  • Dual Straight Probe(F5-F30)
    There are many optional dual straight probes with various specifications like 1.25P/2.5P/5P、Φ10、Φ14、Φ20, which are suitable for flaw detecting the thin plates and bars. The probe radian can be selected according to the diameter of the bars. 
    Protective Cover for Main Unit