ULTRASONIC BOLT TENSION MONITOR
ULTRASONIC BOLT TENSION MONITOR

MODEL: MINI-MAX

MANUFACTURER: DAKOTA ULTRASONICS

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. MINI-MAX can measure the elongation very accurately in fasteners of virtually any material from 1/2 inch to 4 feet in length.

 

Features
  • 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 Percent 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.

SPECIFICATIONS

Physical

  • Size:
    Width (2.5in/63.5 mm)
    Height (6.5 in/165 mm)
    Depth (1.24 in/31.5 mm)
  • Weight:
    13.5 ounces (with batteries).
  • Keyboard:
    Membrane switch pad with
    twelve tactile keys.
  • Operating Temperature:
    14 to 140F (-10C to 60C)
  • Case:
    Extruded aluminum body with nickel-plated aluminum end caps (gasket sealed).
  • Data Output:
    Bi-directional RS232 serial port. Windows® PC interface software.
  • Display:
    1/8in 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

  • Modes:
    Pulse-Echo (standard)
    Pulse-Echo w/Gate (fine adjust)
  • Pulser:
    Square wave pulser with adjustable pulse width (spike, thin, wide).
  • Receiver:
    Manual or Auto Set gain control with 40dB range.
  • Timing:
    10 bit 250 MHz digitizer.
  • Warranty:
    2 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.

Measuring

  • Range: From 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.
  • Units:
    English & Metric / Fahrenheit & Centigrade.

Display

  • A-Scan – Rectified +/- (half wave view), or RF (full waveform view).
  • Large Digits – Display 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.

Memory

  • 16 megabit non-volatile ram.
    Transducer

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.

Features:

  • Setups:
    64 custom user defined setups. Factory setups can also be edited by the user.
  • Gate:
    Gate used to fine adjust where the detection point occurs.
  • Alarm Limits:
    Set hi and lo tolerances with audible beeper, viewable scan bar, and visual LEDs.
  • Auto Set:
    Locates the detection signal, optimizes the gain setting, and adjusts the overall display to show the waveform and detection point automatically.
  • Field Calibration:
    Vector & linear regression.
    Certification
    Factory calibration traceable to national standards.

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