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MAX II Bolt Tension Monitor

Advanced Bolt Tension Monitor


The Dakota Ultrasonics MAX II, Ultrasonic Bolt Tension Monitor, defines the State of the Art in the measurement of the actual clamp load produced by tightening a fastener. The MAX II can measure time, elongation, load, stress, or %strain in bolts of virtually any material from 1 inch to 100 feet in length. By storing the reference waveform and displaying it for comparison while the elongation is being measured, the MAX II minimizes operator training.

MAX II Bolt Tension Monitor performs the above measurements of a fastener under tension, using the transit time of a wave, Hooke's law, and Young's modulus , by sending an ultrasonic wave down the length of the fastener and accurately measuring the change in transit time between an unloaded versus loaded fastener/bolt, and ultrasonically measuring the change in length.

The instrument provides a menu based selection of material from a list of preset material types. To keep data for a bolt type, for repeated measurements for a batch or measuring the bolt elongation over life, a group can be created of upto 250 bolts containing 1 reference length and up to 51 elongations.

Product Specification
Physical Electronics Measuring
Weight: 4.5 lbs (2.04 kgs), with batteries. Display: Blanview sunlight readable QVGA TFT color display (320 x 240 pixels). Viewable area .54 x 3.40 in (115.2 x 86.4 mm), or 5.7in (144.78 mm) diagonal. 16 color pallete, multiple color options and variable brightness. Units: English (in), Metric (mm), or Time (µs).
Size: 8.5W x 6.5H x 2.5D in (216 x 165 x 70mm). Velocity: 0.0492 to .5510 in/µs (1250–13995 m/s).
Operating Temperature: 14 to 140F (-10C to 60C). Screen Refresh Rate: 60Hz. Measurement Modes: Pulse-Echo (P-E), Echo-Echo (E-E), or Echo-Echo-Echo (E-EV).
Keyboard:Membrane switch with 21 tactile keys. Timing: Precision TCXO timing with single shot 100 MHz 8 bit ultra low power digitizer. Measurement Range: 1 to 999.999in (2540cm) in pulse-echo(P-E) measurement mode. Range will vary using multi-echo modes - dependent on material type and consistency.
Case: Extruded aluminum body with nickel plated aluminum end caps (gasket sealed). Pulser Types: Spike, Square Wave & Tone Burst. Detection: Zero Crossing.
Display Views: RF (full wave view), +/- Recti- fied (half wave view), Digits, or split screen combination (wave plus large digits). Pulser Voltage: 100 - 400v. Resolution: +/- 0.00001 in (0.0001 mm).
Environmental: Meets IP65 requirements. Pulse Width: Selectable step options Spike, Thin, Wide, HV Spike, HV Thin, HV Wide, TB.5MHz, TB 1MHz, TB 2MHz, TB 5MHz, TB 10MHz. Spike 40 ns, Square Wave 80 to 400 ns, Tone Burst 50 ns to 1 microsecond. Calibration: Automatic, Fixed, Single or Two- Point zero calibration options.
Connections Quantities:
USB: Direct USB 1.1 PC connectivity. Win- dows & OSX interface software. Time - Nanoseconds.
Power Connector: 12v @ 2amps, adapter 100-240 VAC, .7 Amps, 50-60 Hz. Gain: 0 to 110dB with 0.2dB resolution. Manual and AGC control. Elongation - Change in length (inches/mil- limeters).
5 Pin Lemo (includes): Damping: 50, 75, 100, 300, 600, & 1500 ohms. Load - Force load applied (pounds KIP or megapascals MPa).
RS232Output - RS232 PC serial interface. Frequency Band: Broadband 1.8 - 19 MHz (-3dB) filter. Stress - Force for unit area stress applied (inches per inch or millimeters per millimeter).
Alarm Outputs - Two independent alarm outputs triggered by the gates. Horizontal Linearity: +/- 0.4% FSW.
Vertical Linearity: +/- 1% FSH. Amplifier Linearity: +/- 1 dB.
%Strain - Ratio of elongation to effective length.
Analog Out - Proportional outputs (ampli- tude or distance), 0-10 volts. Amplitude Measurement: 0 to 100% FSH,with 1% resolution. Bolt Materials: Select types from a preset or custom list.
Transducer Connectors: Two LEMO 00 con- nectors. Transducers
Memory Delay: 0 - 999.999in (25,400mm) at steel velocity. Transducer types: Single element - 1 MHz to 10 MHz frequencies, and 1/8” to 1” diameters. Magnetic & Non Magnetic options available.
Log Formats: Grid (Alpha Numeric). Measurement Gates: Three independent gates depending on measurement mode selected, with audible and visual alarms. Amplitude 5-95%, 1% steps. Glue-On: Available for short bo-lts with mini- mal/short elongations to eliminate transducer placement errors.
Capacity: 4 Gb internal & up to 64 Gb Exter- nal SD slot. Features Connectors: Microdot, Lemo 00, or BNC options depending on the transducer model selected.
Screen Capture: Tagged interface file (.tif ) capture for quick documentation. Setups: 64 custom user defined setups; fac tory setups can also be edited by the user. Custom Transducers: Available for special applications.
Custom Setups: 64 user configurations. Auto Set: Automates the detection, scope, and display setting process for each individual bolt. Certification
Power Source Gates: Three measurement gates, dependingon measurement mode used, with adjustable start and threshold. Factory calibration traceable to NIST & MIL- STD-45662A.
Lithium Ion Pack: 10.8v, 2 amp hrs, typical operation 18hrs.
Battery Backup: Emergency battery backup. Six 1.5V alkaline, 1.2V AA Nicad cells, 1.2VAA NI-MH, or other other equivalent power source.
Battery life (continuous use): Alkaline (12 hrs), Nicad (5hrs), and NI-MH (12hrs), with default settings.
Alarm Limits: Adjustable Hi/LO tolerances with visual LED’s and audible beeper. Hard- ware alarm outputs (accesory cable required). 2 year limited
Field Calibration: Vector or Regression cor- rection curve for increased accuracy using Load & Stress.
  • Max II is the most advanced bolt tension monitor on the market.
  • Quantities - Elongation, Load, Stress, Strain and Time (nanoseconds)
  • Sunlight readable color QVGA display (320x240 pixels)
  • Measure Modes - Pulse- Echo, Echo- Echo, Echo- Echo-Verify (triple echo)
  • A u t o C o r r e l a t i o n - Transducer Placement
  • Custom auto calibration feature
  • 4GB internal & up to 64GB external SD memory
  • USB 1.1 connectivity
  • Analog, serial & alarm outputs
  • P C & O S X r e p o r t i n g software
  • Import & export files - between
  • Max II and Mini Max
  • L i - I o n p a c k & 6 A A emergency battery
  • backup option
  • 2 year warranty.
Frequently Asked Questions (3 answered questions)
Max II Bolt Tension Monitor measures stress, strain, elongation & tension induced in bolts.

Person name: Asian


Person name: Asian

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ZF Wind uses Max II Bolt Tension Monitor to cross verify the Joint efficiency of bolts used in assembly of the Wind turbine.
Application Name: Cross-verification of the Joint efficiency (Clamp load & elongation ) of bolt & studs used in assembly of the Wind turbine. Client Name- ZF Wind Requirement: To cross verify the Joint efficiency (Clamp load & elongation ) of bolt & studs used in assembly of the Wind turbine. The manual torques wrenches measure the applied force between nuts & bolt when tightening a fastener, the output is affected by temperature, friction & resistance, and it’s not reliable. To determine the accurate joint efficiency, assessment of clamp load is required in respect of elongation produced due to force applied by fastening the bolt & studs. Solution: Max II Bolt Tension Monitor is used to cross-verify the joint efficiency (clamp load & elongation) of bolt after fastening through the conventional method. MAX II Bolt tension monitor is a highly sensitive ultrasonic Bolt tension monitor that measures bolt load, elongation, stress and percentage of strain ...
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