UD3-71 Ultrasonic portable flaw detector

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UD3-71 flaw detector is an ultrasonic general-purpose flaw detector which is intended for:

  • manual non-destructive testing of products for detection of defects such as discontinuity and inhomogeneity of material in raw stock, finished items, in-process goods, welded, soldered, bolt, riveted and other joints;
  • measurement of defects depth and depth coordinates;
  • measurement of various items thickness at one-way access to them;
  • measurement of signals (reflected from defects) amplitudes ratio;
  • measurement of equivalent defects dimensions;
  • assessment of sound velocity in sundry materials.

Flaw detector is able to test materials and products with sound velocity from 1500 m/s to 12 000 m/s.

UD3-71 ultrasonic flaw detector provides the testing of weld joints and base materials, and also thickness measurement of monometals, bimetals in correspondence with the regulatory documents requirements in various industrial sectors.

UD3-71 Flaw detector advantages

 Min. instrument dimensions – no more than 200х100х110 mm – assure high instrument ergonomics and operation simplicity.

Внешний вид

Внешний вид

  • Various A-scan display forms: RF/full wave/+half wave/-half wave;
  • Dynamic change of generating path characteristics depending on the switched-on frequency filters;
  • Information display forms: А-scan, B-scan, orthogonal views, corrosion map;
  • USB slave;
  • Flaw detector can be operated at the ambient temperature from minus 10 to +45 °С;
  • Flaw detector case protection level from solid bodies and water penetration corresponds to IР65;
  • Flaw detector is also resistant to ionizing radiation impact and is meant for operation in increased humidity conditions;
  • easily removable storage battery;
  • легкосъемная аккумуляторная батарея

  • equipped with protective cover:
  • защитный чехол

  • device complies with European Standard 61326:2005(First edition).
  • Availability of two independent measurement gates with the defects alarm system (sound and light) by each gate. At the same time, every gate has:
  • Three going-off levels: "ACCEPTANCE"; "REGISTRATION"; "SEARCH" are marked on flaw detector screen in "RED", "BLUE" and "GREEN" color. The colors of light ALARM by every gate correspond to them. Application of three-level gates makes it possible to estimate the risk of detected defects;
  • the sound alarm going-off level is set up by an operator by a specific gate;F
  • the mode (when the preset level is transcended or not) is set up by an operator for every gate independently.

UD3-71 flaw detector

UD3-71 flaw detector

When using three-level gates it is possible to register echo-signals at different levels relative to the acceptance level. It will permit to record echo-signals from developing defects and monitor defects in the program of testing results viewing what is necessary for carrying out ultrasonic testing (UST) of important objects. Three-level gates as well as convenient sound and light defect alarm system allow to assess the detected discontinuity dimensions quickly and qualitatively.

Time control gain (TCG) mode

 TCG level is set up in the point grid connected by linear sections, i.e. it is possible to set sundry TCG curve forms – piecewise-linear, step etc. TCG level corresponds to the signal attenuation in the given point relative to the set gain value. This option allows to test long-length items and items made from materials with great attenuation, it is also used for sensitivity setup when testing weld joints with wall thickness of more than 12 mm.

UD3-71 flaw detector

DAC amplitude curves mode

 DAC mode is an alternative to TCG mode and enables to plot the curve which connects points (corresponding to signals peaks) on the screen. DAC mode also allows quick and convenient TCG curve plotting.

UD3-71 flaw detector


 "REFLECTIONS MARKING" mode helps to imagine the detected defect location in the testing item in the same direction as ultrasonic beams (straight and multiple-reflected beam).

UD3-71 flaw detector

"PEAK" mode

"Peak" mode is indispensable during small defects search, operation in unstable acoustic coupling conditions. Upon that, the current signal value is displayed on the screen concurrently with the max. signal envelope of all  observable echo-signals (displayed in red color). This mode is applied for max. echo-signal amplitude determination and conditional length estimation. It can be used for testing results registration both for rejected and in-order items, what will confirm the presence or absence of defects throughout the whole scanning perimeter.
Thus, "Peak" mode application increases results reliability and reduces testing time.

UD3-71 flaw detector

Measurement of equivalent defects dimensions (DGS diagrams)

UD3-71 flaw detector distinctive feature is the measurement of equivalent defects dimensions.

Using DGS diagrams UD3-71 flaw detector enables to measure equivalent defects dimensions in the range from 1 to 20,0 mm (equivalent defect diameter) with relevant error which does not exceed 15 %.

Availability of the algorithm (built in flaw detector software) of automatic plotting of DGS diagrams for various probes types makes it possible to analyze the received data quickly and qualitatively and determine equivalent dimensions of the detected discontinuities with their further registration. To save the time which is used for the instruments setup, UD3-71 instrument software contains the function of automatic TCG curve plotting by DGS diagram plotted for a specific probe.

UD3-71 flaw detector

RF signal display

To measure precisely the item thickness and defects coordinates, the undetected RF (radio frequency) signal is used what enables to assure the measurement resolution of 0,01 mm. Two modes of the point selection on the signal oscillogram by which the measurements are taken (automatic and manual) are provided in the instrument.

UD3-71 flaw detector

Special program interface mode

This mode is applied for solving special-purpose tasks. For example, when testing various single-type parts or when the part has many testing area. For solving this task "Special program interface" system is used in UD3-71. The necessary standard setups and program interface of "Special program interface" enter flaw detector from PC. The input setups are protected from illegal change by NDT inspector (operator).

UD3-71 flaw detector

Mode of connection to PC is essential for data transmission from the flaw detector memory to the computer memory and vice-versa. It is used for transmitting "А-scans" and "B-scans" to PC for reports creation on the basis of testing results or databases.


Ultra UDх-7х - the program intended for processing testing results of UD3-71 ultrasonic flaw detector and serves for functionality extension and increase of instrument operation comfort. The present program assures operation with the data stored on PC

 Memory elements operation enables to perform the following functions:

View: setups, А-Scans and B-Scans Creation and editing: Setups
Report printing: A-Scans and B-Scans


parameters units values
Max. scan range inch 236,22
mm 6000
Min. scan range inch 0,0197
mm 0.5
Velocity in the material inch /µs from 0,0025 to 0,0375
m/s from 1000 to 15000
Scan delay inch 236,22
mm 6000
Delay (in the wedge) µs from 0 to 100
Frequency МHz from 0,4 to 15
Initial pulse frequency Hz from 30 to 1000
Operating modes   А-scan, B-scan
Gain dB from 0 to 100
Signal detection   radio signal (without detection)
full wave
positive half-wave
negative half-wave
Noises cutoff % from 0 to 80
Gates   Two independent three-level measuring gates
Two additional special gates
Measurement modes   Peak, Front
Reconfigurable readings in А-scan   distance by the beam, amplitude in gates, defects depth coordinates, equivalent defect dimensions    
Measurement resolution inch 0,00039
mm 0,01
Defect alarm   sound, light, visual
Setups quantity   at least 100
Languages and interfaces   English, Russian, Chinese (additional languages are possible to the customer's order)
Units   SI system units
Connection to PC   USB port
Battery   storage battery
12V/2500 mА×h
Operation time from the battery hour at least 8
Power supply from AC network   single-phase network
230 V, 50 Hz
Screen   color TFT
Screen size, W x H inch 2,756 x 1,969
mm 71,52 x 53,64
Screen resolution, W x H pixel 320 x 240
А-scan size, W x H x D pixel 320 x 200
Overall dimensions inch 8,27 x 3,94 x 4,33
mm 210 x 100 x 110
Weight lb 1,764
kg 0,8
Operating temperature ºF from minus 22 to +113
ºC from minus 30 to +45
Protection from environmental impacts   IP 65 according to GOST 14254