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The Dakota BT2-DL Benchtop Bolt Tension Monitor (part number Z-197-0001), also known as the Max II, is an ultrasonic gauge that measures the elongation, and therefore the load, produced when a threaded fastener is tightened. It builds on the earlier BT1-DL with added speed, hardware and length capacity, measuring fasteners up to 100 feet long. Because the measurement is based on ultrasound rather than applied torque, it is not influenced by friction or thread resistance, which makes it a more reliable way to confirm that each bolt carries the intended clamp load.
The Dakota BT Benchtop Bolt Tension Monitor sends an ultrasonic pulse along the bolt and tracks the change in transit time as the fastener stretches. It covers a measurement range from 25.4mm to 25,400mm in pulse-echo mode with a resolution of +/- 0.0001mm, and a velocity calibration range of 1250 to 13,995m/s. Detections are reported as time in nanoseconds, elongation in millimetres, load, stress and percentage strain. An Auto Set function automates detection, scope and display setup for each individual bolt, and temperature compensation corrects for thermal effects on the reading.
Readings are shown on a sunlight-readable QVGA colour TFT display and stored in 4GB of internal memory with sequential and grid batching. The glue-on option suits short bolts with minimal elongation to remove transducer placement errors. Factory calibration is traceable to NIST and MIL-STD-45662A. Supplied by BAMR, South Africa's authorised distributor.
Dakota BT Benchtop Bolt Tension Monitor
The Dakota BT2 Ultrasonic Bolt Tension Monitor 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!
- Material thickness digits display
- A-Scan Rectified +/- (half wave view), or RF (full waveform view)
- Temperature Compensation
- Limit Alarm Mode
- Memory and Data Logging 4GB internal memory, Sequential and grid batching, Bitmap graphic capture and capture viewer
- USB-C Interface
- Temperature Sensor
- Auto Set Automates the detection, scope, and display setting process for each individual bolt
- Glue-On Available for short bolts with minimal/short elongations to eliminate transducer placement errors
Display Mode
- Material thickness digits display
- ♦
- A-Scan
- Rectified +/- (half wave view), or RF (full waveform view)
Measurement Range
- Measurement Range
- PE - 25.4 - 25,400mm, EE, EEV
- Resolution
- +/- 0.0001mm
Measurement Rate
- Manual
- 8 readings per second
- Velocity Calibration Range
- 1250 - 13,995m/s
- Temperature Compensation
- ♦
- Limit Alarm Mode
- ♦
Display
- Display
- Blanview sunlight readable QVGA TFT colour display (320 x 240 pixels), Viewable area 115.2 x 86.4 mm, or 144.78 mm diagonal
- Units (Selectable)
- mm, μs
- LED Backlight
- On / Off / Auto
- Repeatability / Stability Indicator
- ♦
- Low Battery Indicator
- ♦
- Battery Save Mode
- Auto
- Screen Refresh Rate
- 60Hz
Transducer
- Transducer Probe Type
- Single element
- Transducer Frequency Range
- 1 - 10MHz
- Transducer Connector Type
- Microdot, Lemo and BNC
Pulser and Signal Processing
- Pulser Type
- Spike, Square Wave & Tone Burst. Pulser Voltage: 100 - 400v. Selectable step options Spike, Thin, Wide, HV Spike, HV Thin, HV Wide, TB .5MHz, TB 1MHz, TB 2MHz, TB 5MHz, TB 10 MHz. Spike 40 ns, Square Wave 80 to 400 ns, Tone Burst 50 ns to 1 microsecond
- 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
Gates and Calibration
- Measurement Gate
- Three independent gates depending on measurement mode selected, with audible and visual alarms. Amplitude 5-95%, 1% steps
- Setups
- 64 custom user defined setups; factory setups can also be edited by the user
- Calibration Options
- Automatic, fixed, single and two-point
- Field Calibration
- Vector or Regression correction curve for increased accuracy using Load & Stress
Measurement Features
- 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 millimetre)
- % Strain
- Ratio of elongation to effective length
- Bolt Materials
- Select types from a preset or custom list
- Alarm Limits
- Adjustable Hi/Low tolerances with visual LED's and audible beeper
- Alarm Limits Bar
- Hi & Lo alarm limits for displaying an acceptable tolerance range
Timing
- Timing
- Precision TCXO timing with single shot 100 MHz 8 bit ultra-low power digitizer
Physical and Operating
- Operating Temperature
- -10 to 60°C
- Power Supply
- Lithium Ion Pack (supplied) or 6 x AA batteries
- Battery Life
- Lithium Pack: 18hrs, Alkaline: 12 hrs, Nicad: 5 hrs, NI-MH: 12 hrs
- Gauge Weight
- 2.04kg - including batteries
- Gauge Dimensions
- 216 x 165 x 70mm
Interfaces
- USB-C Interface
- ♦
- Temperature Sensor
- ♦
Part Numbers
♦ = feature present / included
| Part Number | Description | Certificate |
|---|---|---|
| Z-197-0001 | Dakota BT2-DL Benchtop Bolt Tension Monitor (Max II) | ♦ |
Specifications
Display Mode
- Material thickness digits display
- ♦
- A-Scan
- Rectified +/- (half wave view), or RF (full waveform view)
Measurement Range
- Measurement Range
- PE - 25.4 - 25,400mm, EE, EEV
- Resolution
- +/- 0.0001mm
Measurement Rate
- Manual
- 8 readings per second
- Velocity Calibration Range
- 1250 - 13,995m/s
- Temperature Compensation
- ♦
- Limit Alarm Mode
- ♦
Display
- Display
- Blanview sunlight readable QVGA TFT colour display (320 x 240 pixels), Viewable area 115.2 x 86.4 mm, or 144.78 mm diagonal
- Units (Selectable)
- mm, μs
- LED Backlight
- On / Off / Auto
- Repeatability / Stability Indicator
- ♦
- Low Battery Indicator
- ♦
- Battery Save Mode
- Auto
- Screen Refresh Rate
- 60Hz
Transducer
- Transducer Probe Type
- Single element
- Transducer Frequency Range
- 1 - 10MHz
- Transducer Connector Type
- Microdot, Lemo and BNC
Pulser and Signal Processing
- Pulser Type
- Spike, Square Wave & Tone Burst. Pulser Voltage: 100 - 400v. Selectable step options Spike, Thin, Wide, HV Spike, HV Thin, HV Wide, TB .5MHz, TB 1MHz, TB 2MHz, TB 5MHz, TB 10 MHz. Spike 40 ns, Square Wave 80 to 400 ns, Tone Burst 50 ns to 1 microsecond
- 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
Gates and Calibration
- Measurement Gate
- Three independent gates depending on measurement mode selected, with audible and visual alarms. Amplitude 5-95%, 1% steps
- Setups
- 64 custom user defined setups; factory setups can also be edited by the user
- Calibration Options
- Automatic, fixed, single and two-point
- Field Calibration
- Vector or Regression correction curve for increased accuracy using Load & Stress
Measurement Features
- 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 millimetre)
- % Strain
- Ratio of elongation to effective length
- Bolt Materials
- Select types from a preset or custom list
- Alarm Limits
- Adjustable Hi/Low tolerances with visual LED's and audible beeper
- Alarm Limits Bar
- Hi & Lo alarm limits for displaying an acceptable tolerance range
Timing
- Timing
- Precision TCXO timing with single shot 100 MHz 8 bit ultra-low power digitizer
Physical and Operating
- Operating Temperature
- -10 to 60°C
- Power Supply
- Lithium Ion Pack (supplied) or 6 x AA batteries
- Battery Life
- Lithium Pack: 18hrs, Alkaline: 12 hrs, Nicad: 5 hrs, NI-MH: 12 hrs
- Gauge Weight
- 2.04kg - including batteries
- Gauge Dimensions
- 216 x 165 x 70mm
Interfaces
- USB-C Interface
- ♦
- Temperature Sensor
- ♦
Part Numbers
♦ = feature present / included
| Part Number | Description | Certificate |
|---|---|---|
| Z-197-0001 | Dakota BT2-DL Benchtop Bolt Tension Monitor (Max II) | ♦ |
Packing List
Packing List
Standards
Standards
Part Numbers
Part Numbers
| Description | Part Numbers |
|---|---|
| Dakota BT2-DL Benchtop Bolt Tension Monitor (Max II) | Z-197-0001 |
Downloads
Frequently asked questions
How long can the Dakota BT2 measure in a bolt or fastener?
The Dakota BT2 measures up to 100 feet in length, with a measurement range of 25.4 to 25,400mm and resolution of +/- 0.0001mm. This covers most practical bolting applications.
Can I calibrate the Dakota BT2 in the field without returning it to the workshop?
Yes. The Dakota BT2 supports field calibration using Vector or Regression correction curves, with calibration data tied to Load and Stress measurements for increased accuracy.
What transducer connector types are compatible with the Dakota BT2?
The Dakota BT2 accepts Microdot, Lemo, and BNC connectors. This flexibility allows you to use existing probes or source specific connectors for your setup.
What measurements can the Dakota BT2 provide beyond bolt length?
The Dakota BT2 measures elongation (change in length), load (force applied in pounds, KIP, or MPa), stress (force per unit area), and percentage strain, giving a complete picture of bolt behaviour under tension.
Is the Dakota BT2 display usable in sunlight or bright factory conditions?
Yes. The Dakota BT2 features a Blanview sunlight-readable QVGA TFT colour display (320 x 240 pixels), so you can read measurements clearly even in bright ambient light.
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Tell us about your application and we will send a quote with lead time and accessories.