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The Dakota Ultrasonics Mini-Max Ultrasonic Bolt Tension Monitor measures the actual elongation produced by tightening a threaded fastener. The Mini-Max enables you to monitor your bolts during periodic shutdowns so you can accurately identify loaded and unloaded waveforms of virtually any material from 1/2 inch to 8 feet in length.
The MINI-MAX determines the length of the fastener through the change in the transit time of an ultrasonic shock wave across the length of the fastener, regardless of tightening method. Measurements are displayed in time (nanoseconds), elongation, load, stress, or percent strain. The digital and automated diagnostics are intuitive and minimize the requirement for significant operator training.
The Dakota Ultrasonic Mini-Max allows you to visually compare your results in an intuitive and easy-to-use, menu driven 1/8 inch VGA display with 240 x 160 pixel resolution. The Mini-Max stores up to 8,000 readings and waveforms in multiple groups and offers built-in linear regression or vector for optimizing load measurements.
The Mini-Max also has an auto-set feature that automatically optimizes detection and adjusts the display. There are also hi/lo alarm tolerance limits that work in conjunction with the data port and external pump shut-off device.
The Dakota Ultrasonics Mini-Max ships with built-in data recordation and supporting DakView utility software for Windows PC & MAC OSX, and is a field-tested solution for the most difficult bolting problems.
When purchasing this instrument, please be sure to select the transducers that best meet your measurement requirements.
| Physical | |
| Size | Width (2.5"/63.5 mm) Height (6.5"/165 mm) Depth (1.24"/31.5 mm) |
| Weight | 13.5 ounces (with batteries) |
| Operating Temperature | -14˚ to 140˚F (-10˚ to 60˚C) |
| Keyboard | Membrane switch with twelve tactile keys |
| Case | Extruded aluminum body with nickel plated aluminum end caps (gasket sealed) |
| Data Output | Bi-directional RS232 serial port; Windows® PC interface software |
| Display | 1/8" VGA grayscale display (240 x 160 pixels) viewable area 2.4 x 1.8" (62 x 45.7mm) EL backlit (on/off/auto invert) |
| Ultrasonic Specifications | |
| Measurement Modes | Pulse-Echo (flaws, pits) Pulse-Echo w/Gate (fine adjust) |
| Pulser | Square wave pulser with adjustable pulse width (spike, thin, wide) |
| Reciever | Manual or AGC gain control with 40dB range |
| Timing | 10 bit 250 MHz digitizer |
| Transducer | |
| Single Element | 1 MHz to 10 MHz & 1/8 to 1" diameters |
| Dual Element | 1 to 10 MHz |
| Measuring | |
| Range | 1 to 96" (25.4 to 244 cm) |
| Quantities | Time: Nanoseconds Elongation: Change in length (inches/millimeters) Load: Force load applied (pounds KIP or megapascals MPa) Stress: Force for unit area stress applied (inches per inch or millimeters per millimeter) % Strain: Ratio of elongation to effective length |
| Resolution | ± 0.00001" (0.0001 mm) |
| Velocity Range | 0.0492 to .3937 inches/microsecond (in/µs) (1250 to 9,999 meters/sec) |
| Units | Imperial & Metric / Farenheit & 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 inch (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 | |
| Memory | 16 megabit non-volatile ram |
| Specifications | Factory calibration traceable to NIST & MILSTD-45662A |
| Warranty | 2 Year limited |
