Materials Testing
    Moniteur de tension de boulon à ultrasons

Moniteur de tension de boulon à ultrasons

  • Mini-Max

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The MINI-MAX, Ultrasonic Bolt Tension Monitor, defines the state of the art in the measurement of the actual elongation produced by tightening a threaded fastener.

The MINI-MAX can measure the elongation very accurately in fasteners of virtually any material from 1/2 inch to 4 feet in length. The measurement is achieved by determining the change in the transit time, of an ultrasonic shock wave along the length of the fastener as the fastener is tightened by any method. The on-board microcomputer automatically interprets this time measurement to display the time(nanoseconds),elongation, load, stress, or %strain from stretching a fastener. Through the use of high speed digital signal processing and automated diagnostics, the MINI-MAX minimizes the requirement for extensive operator training. With built in data logger and reporting through an RS232 interface, the MINI-MAX offers an easy to use and reliable solution to the most difficult bolting problem.


  • The first cost effective ultrasonic solution available on the market.
  • Effectively monitor your bolts during periodic shutdowns over the service life of the fastener.
  • Visually compare the unloaded to the loaded waveform.
  • Measurement quanities - Time (nanoseconds),Elongation, Load, Stress, and %Strain.
  • Display Options - RF, Rectified, Large Digits with Limits Bar.
  • Display Resolution - 1/8" VGA 240 x 160 pixels.
  • Stores 8000 readings and waveforms in multiple groups.
  • Built-in Linear regression or vector for optimizing load measurements.
  • The Auto Set feature automatically optimizes detection and adjusts display.
  • Hi/Lo alarm tolerance limits work in conjunction with the data port and external pump shut-off device.

    Cat. No.Description
    DAZ156-0001MINI-MAX without Temperature Connector - External temperature source used, or user will be measuring fasteners one time only
    DAZ156-0002 MINI-MAX with temperature Connector - Included only with the purchase of a temperature sensor pt# A-156-8001
    Includes Unit, 3 AA Batteries, 4 oz. Bottle of couplant, RS232 Transfer Cable
    Lemo to DB9, USB converter cable to DB9, Carrying Case, 10'
    Lemo to Microdot Transducer cable, PC Utility Software, Operation
    Manual and Certification.


      SizeWidth (2.5in/63.5 mm)
      Height (6.5 in/165 mm)
      Depth (1.24 in/31.5 mm)
      Weight13.5 ounces (with batteries).
      KeyboardMembrane switch pad with
      twelve tactile keys.
      Operating Temperature14 to 140F (-10C to 60C)
      CaseExtruded aluminum body with nickel-plated aluminum end caps (gasket sealed).
      Data OutputBi-directional RS232 serial port. Windows® PC interface software.
      Display1/8in VGA grayscale display (240 x 160 pixels). Viewable area 2.4 x 1.8in (62 x 45.7mm). EL backlit (on/off/auto)
      Ultrasonic Specifications Measurement
      ModesPulse-Echo (standard)
      Pulse-Echo w/Gate (fine adjust)
      PulserSquare wave pulser with adjustable pulse width (spike, thin, wide).
      ReceiverManual or Auto Set gain control with 40dB range.
      Timing10 bit 250 MHz digitizer.
      Warranty2 year limited
      Power Source
      • Three 1.5V alkaline or
      • 1.2V NiCad AA cells.
      • Typically operates for 150 hours on alkaline and 100 hours on NiCad (charger not included.)
      • Auto power off if idle 5 min.
      • Battery status icon.
      RangeFrom 1″ to 96″ (25.4mm to 244cm) bolts.
      Time Nanoseconds.
      Elongation Change in length (inches/millimeters).
      Load Force load applied (pounds kIP or kN Kilonewtons).
      Stress Force for unit area stress applied (pounds kPSI or megapascals MPa).
      Strain % percentage strain applied (inches per inch or millimeters per millimeter)
      Resolution+/- .00001 inches (0.0001 mm)
      Velocity Range.0492 to .3936 in/ms
      1250 to 9999 meters/sec
      Fixed, Single, and Two point zero calibration options.
      Select bolt material types from a preset or custom list.
      UnitsEnglish & Metric / Fahrenheit & Centigrade.
      A-Scan Rectified +/- (half wave view),or RF (full waveform view).
      Large DigitsDisplay and toggle between nanoseconds, elongation, load, stress, and strain.
      Digit Height 0.400 in (10mm).
      Limits Bar(alarm limits)Set Hi & Lo alarm limits for displaying an acceptable tolerance range.
      Repeatability Bar Graph Bar graph indicates stability of measurement.
      Data Logger (internal)
      Total of 8,000 readings, multiple bolt groups. Stores both waveform views, nanoseconds, elongation, load, stress, and strain for each reading.
      Memory16 megabit non-volatile ram.
      Transducer Types
      • Single Element (1 to 10 MHz & 1/8″ to 1″diameters).
      • Locking quick disconnect
        “00” LEMO connectors.
      • Standard 10 foot cable.
      • Custom transducers and cable lengths available on request.
      • Temperature probe for automatic temperature compensation.
      Setups64 custom user defined setups. Factory setups can also be edited by the user.
      GateGate used to fine adjust where the detection point occurs.
      Alarm LimitsSet hi and lo tolerances with audible beeper, viewable scan bar, and visual LEDs.
      Auto SetLocates the detection signal, optimizes the gain setting, and adjusts the overall display to show the waveform and detection point automatically.
      Field CalibrationVector & linear regression.
      Factory calibration traceable to national standards.