Dakota BT Bolt Tension Monitor

Product Description

The Dakota BT Bolt Tension Monitor 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.

By using ultrasonics, bolt tension monitors 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.

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.

Applications


Wind Turbines…..	Automotive Frames	Bridge Structures..

Theme Parks….

Technical Specifications

Part Number	Description	Certificate
Z-156-0008	Dakota BT1-DL Bolt Tension Monitor (MiniMax)	■
Operating Temperature	-10 to 60ºC
Power Supply	3 x AA batteries and via USB
Battery Life	Alkaline 35 hrs, Nicad 10 hrs, NI-MH 35 hrs
Gauge Weight	383g – including batteries
Gauge Dimensions	63.5 x 165 x 31.5mm

● Certificate supplied as standard

Product Features

Model	BT1-DL
Display Mode
Material thickness digits display	■
A-Scan	Rectified +/- (half wave view), or RF (full waveform view)
Measurement Range	PE – 25.4 – 25,400mm
Resolution	0.001mm or 0.0001mm switchable
Measurement Rate
Manual	8 readings per second
Velocity Calibration Range	1250 – 13,995m/s
Temperature Compensation	■
Limit Alarm Mode	■
Memory and Data Logging	4GB internal memory Sequential and grid batching Bitmap graphic capture and capture viewer
Calibration Options	Automatic, fixed, single and two-point
Transducer Probe Type	Single element
Transducer Frequency Range	1 – 10MHz
Display	1/8” VGA greyscale display (240 x 160 pixels) Viewable area 62 x 45.7mm
Units (Selectable)	mm, μs,°C
LED Backlight	On / Off/ Auto
Repeatability / Stability Indicator	■
Low Battery Indicator	■
Battery Save Mode	Auto
Transducer Connector Type	Microdot, Lemo and BNC
USB-C Interface	■
Temperature Sensor	5 pin LEMO 1
Screen Refresh Rate	30 Hz
Timing	Precision TCXO timing with single shot 100 MHz 8 bit ultra-low power digitizer
Pulser Type	Square Wave. Selectable 100, 150 and 200 volts. Selectable options Spike, Thin, and Wide. 80 to 400ns
Damping	50, 75, 100, 300, 600, & 1500ohms
Frequency Band	Broadband 1.8 – 19 MHz (-3dB) filter
Horizontal Linearity	+/- 0.4% FSW
Vertical Linearity	+/- 1% FSH
Amplifier Linearity	+/- 1 dB
Amplitude Measurement	0 to 100% FSH, with 1% resolution
Delay	25,400 mm at steel velocity
Measurement Gate	One gate with audible and visual alarm. Amplitude 5-95%, 1% steps
Setups	64 custom user defined setups; factory setups can also be edited by the user
Auto Set	Automates the detection, scope, and display setting process for each individual bolt
Alarm Limits	Adjustable Hi/Low tolerances with visual LED’s and audible beeper
Field Calibration	Vector or Regression correction curve for increased accuracy using Load & Stress
Alarm Limits Bar	Hi & Lo alarm limits for displaying an acceptable tolerance range
Detections	Zero Crossing
Time	Nanoseconds
Elongation	Change in length (mm)
Load	Force load applied (pounds KIP, or megapascals MPa)
Stress	Force for unit area stress applied (millimeters per millimeter)
%Strain	Ratio of elongation to effective length
Bolt Materials	Select types from a preset or custom list
Glue-On	Available for short bolts with minimal/short elongations to eliminate transducer placement errors

Data Sheet