MFD620C Ultrasonic Flaw Detector





Measuring range:

0 to 6000 mm, at steel velocity

Resolution Accuracy:

Horizontal: +/-0.2% FSW, Vertical: 3% FSH, Amplifier Accurac

Communication storage:

USB2.0;50 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

    The MFD620C is an advanced digital ultrasonic flaw detector featuring a multi-color TFT LCD and a host of new features to meet challenging inspection requirements. It combines powerful flaw detection and measurement capabilities, extensive data storage, and the ability to transfer detailed inspection data to the PC via its high-speed USB port.

    The instrument incorporates many advanced signal processing features including a 15MHz RF bandwidth to permit testing of thin materials, narrowband filters to improve signal to noise in high gain applications, a spike pulser for applications requiring higher frequencies, and a tunable square wave pulser to optimize penetration on thick or highly attenuating materials.

     Its waterproof, oil proof, dustproof function can achieve IP65 protection level. It is the necessary professional precision instrument for defect detection, quality control, on-line safety monitoring and life evaluation in fields of oil, chemical, metallurgy, shipbuilding, aviation, railways and so on.

    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


    Sampling10 digit AD Converter at the sampling speed of 160 MHz

    RectificationPositive Halfwave, Negative Halfwave, Fullwave and RF

    Analog Bandwidth: 0.5MHz to 10MHz capability with selectable frequency ranges (automatically set by the instrument) to match probe for optimum performance.

    Gain0 dB to 110 dB adjustable in selectable steps 0.1 dB, 1.0dB, 2 dB, 6 dB, and locked.


    Two fully independent gates offer a range of measurement options for signal height or distance using peak triggering.

    The echo-to-echo mode allows accurate gate positioning for signals which are extremely close together.

    Gate Start: Variable over entire displayed range

    Gate Width: Variable from Gate Start to end of displayed range

    Gate Height: Variable from 0 to 99% Full Screen Height

    Alarms: Threshold positive/negative


    Memory of 50 channel files to store calibration set-ups

    Memory of 1000 wave files to store A-Scan patterns and instrument settings.

    All the files can be stored, recalled and cleared.

    Video Recorder

    Screen scenes can be captured as movie files.  As long as 2 hours movie can be saved to the inside memory.  It can be re-played using the instrument or the PC software delivered with the instrument.

    Video Recorder is useful in many situations, it is very convenient for those who want to analyze the probing activities later.

    Real Time Clock

    The instrument clock keeps running tracking the time.


    High speed USB2.0 port. Two USB modes can be selected: U-DISK and U-BRIDGE. In U-DISK mode, the instrument acts as a USB flash disk when connected to PC. Configuration files, saved pictures and recorded movies can be copied to PC when possible. In U-BRIDGE mode, the instrument exchanges data with DataPro Software. The optional DataPro software helps manage and format stored inspection data for high-speed transfer to the PC. Data can be printed or easily copied and pasted into word processing files and spreadsheets for further reporting needs. New features include live screen capture mode and database tracking.

    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) multi-color 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 2 hours
    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 ~ 6000) mm in steel
    Bandwidth 0.5 to 10MHz automatic matching according to the probe frequency
    Material Velocity (1000~ 15000) m / s
    Dynamic Range ≥ 36dB
    Vertical Linear Deviation ≤ 3%
    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
    Alarm Beep Alarm and LED light Alarm
    Power Supply DC 9V
    Working Time >8 hours
    Overall Dimensions 280 × 220 × 70(mm)
    Operating Temperature (-10 ~ 50) ℃
    Relative Humidity (20 ~ 95)% RH
    Pulse Energy 200V, 300V, 400V, 500V ,600V selectable, suitable for various probe
    Pulse Width (0.1~0.5)µs range with continuous adjustment to match the different frequency probes
    Probe Damping 100Ω、200Ω、400Ω selectable 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, both peak and edge can trigger it
    Gain 0 dB to 110 dB adjustable in selectable steps 0.1 dB, 1 dB, 2dB and 6dB
    Transducer Connections BNC or LEMO