The Dakota BT Bolt Tension Meter uses ultrasound to precisely measure fastener elongation, time (nanoseconds), load, stress & % strain.

When nuts and bolts are fastened together under load the action of tightening the nut increases the force applied to the bolt causing elongation.

Ultrasonics bolt tension meter are not affected by temperature, friction or resistance factors affecting the accuracy of standard torque measurement techniques - giving the Dakota BT1-DL Bolt Tension Monitor accuracy within 0.0001mm (0.00001 inch).

Using the gauge's USB interface together with the optional shut off accessory the gauge can be programmed to automatically stop the tightening process when the appropriate load has been applied.

Features:

• Range of display & measurement options including: Elongation, Load, Stress, and %Strain, RF, Rectified, Large Digits with Limits Bar
• Temperature compensation to counteract measurement irregularity caused by temperature change
• Data storage capability: 4GB internal memory
• Auto Set feature automatically optimizes detection and adjusts display
• Hi/Lo Alarm tolerance limits work in conjunction with the data port

Measurement is achieved by determining the change in the transit time of an ultrasonic wave along the length of the fastener as the fastener is tightened using a mechanical method. The time is then converted to  elongation, load, stress, or % strain. 

The Dakota Ultrasonics Mini-Max has 4GB SD storage capacity for data storage in a group file format, as well as .tif file screen captures for additional documentation. 

DakView PC & OSX utility software completes the reporting process and allows for present and future verification.

Highlights

• Can measure bolts from 1/2″ up to 50 ft. (15.24 m).
• Auto calibration for system zero.
• Built in load calibration toolkit.
• Wide range of material types and calibrations.
• Selectable 200 volt square wave pulser (100, 150, 200 volts).
• Variable transducer damping (50, 75, 100, 300, 600 & 1500 ohms), for use with 1-10 MHz transducers.
• Large 110 dB gain range.
• Variable digitizer for improved resolution and stability.
• Temperature compensated.
• Hi/Lo alarm limit used for for tolerances.
• 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.
• The Auto Set feature automatically optimizes detection and adjusts display.

Dakota BT Benchtop Bolt Tension Monitor

The Dakota BT2 Ultrasonic Bolt Tension Meter is the latest gauge addition to our bolting products. 

It incorporates all of the great features of the Dakota BT1-DL Bolt Tension Monitor, with some added benefits in terms of features, hardware, speed, and length. Dakota BT2-DL Ultrasonic Bolt Tension Monitor very accurately measures fasteners up to 100 feet in length, and sports our very best effort to date…in terms of overall performance/power!