Bolt Tension Meter
BT1-DL Ultrasonic Bolt Tension Monitor
The BT1-DL Ultrasonic Bolt Tension Monitor, formerly known as the MINIMAX, is a state of the art instrument designed to measure elongation produced by tightening a threaded fastener. It accurately measures the elongation of fasteners of virtually any material from 1/2 inch to 10 feet in length. The measurement is achieved by determining the change in the transit time of an ultrasonic shock wave along the length of the fastener as the fastener is tightened. The on-board microcomputer automatically interprets this time measurement to display the time(nanoseconds), elongation, load, stress, or % strain from stretching a fastener.
Specifications
| Measuring Range | From 1" to 50ft (25.4mm to 15.24m) dependent on material type and consistency. |
| Time | Nanoseconds |
| Elongation | Change in length (inches/millimeters) |
| Load | Force load applied (pounds kIP or kN Killonewtons) |
| Stress | Force for unit area stress applied (pounds kPSI or megapascals MPa) |
| Strain % | percentage strain applied (inches per inch or millimeters per millimeter) |
| Resolution | +/- .00001 inches (0.0001 mm) |
| Velocity Range | .0492 to .3936 in/ms 1250 to 9999 meters/sec |
| Calibration | Fixed, Single, and Two point zero calibration options.
Select bolt material types from a preset or custom list. |
| Units | English & Metric / Fahrenheit & Centigrade |
| Measuring Modes | Pulse-Echo (standard) Pulse-Echo w/Gate (fine adjust) |
| Pulser | Square wave pulser with adjustable pulse width (spike, thin, wide) |
| Receiver | Manual or Auto Set gain control with 40dB range |
| Timing | 10 bit 250 MHz digitizer |
| Display Modes | A-Scan - Rectified +/- (half wave view), or RF (full waveform view) |
| Alarm Limits | Set hi and lo tolerances with audible beeper, viewable scan bar, and visual LEDs |
| Data Logger (Internal) | Total of 8,000 readings, multiple bolt groups. Stores both waveform views, nanoseconds, elongation, load, stress, and strain for each reading |
| Memory | 4gb |
| Transducer | Single Element (1 to 10 MHz & 1/8" to 1" diameters) |
| Transducer Cable Length | 10 foot (custom lengths available, inquire) |
| Temperature Probe | for automatic temperature compensation |
| Setup Memory | 64 custom user defined setups. Factory setups can also be edited by the user |
| Gate | Gate used to fine adjust where the detection point occurs |
| Auto Set | Locates the detection signal, optimizes the gain setting, and adjusts the overall display to show the waveform and detection point automatically |
| Field Calibration | Vector & linear regression. Includes Factory calibration traceable to national standards |
| Power | Three 1.5V alkaline or 1.2V NiCad AA cells.
Typically operates for 150 hours on alkaline and 100 hours on NiCad (charger not included.) |
| Dimensions | Width (2.5in/63.5 mm) Height (6.5 in/165 mm) Depth (1.24 in/31.5 mm) |
| Weight | 13.5 ounces (with batteries) |
| Operating Temperature | 14 to 140F (-10C to 60C) |
BT2-DL Ultrasonic Bolt Tension Monitor
The BT2-DL Ultrasonic Bolt Tension Monitor, formerly known as the MAX II is designed for precision measurement of fasteners up to 100 ft / 30 m in length. It incorporates all of the great features of the original MINIMAX, with improved features, hardware, speed, and range. The BT2-DL is designed for use in a wide range of industrial and lab applications including wind turbines. It enables you to accurately monitor bolt tension ultrasonically, measuring the elongation (change in length) of your bolts. Revisiting bolts over time, to measure deterioration is possible. The new "Auto Correlation" feature that helps you to optimize your transducer placement. Together with the large QVGA sunlight readable color display and the calibration function, it is very easy to use without the steep learning curves associated with other models.
Specifications
| Measuring | |
|---|---|
| Units | English (in), Metric (mm), or Time (µs) |
| Velocity | 0.0492 to .5510 in/µs (1250–13995 m/s) |
| Measurement Modes | Pulse-Echo (P-E), Echo-Echo (E-E), or Echo-Echo-Echo (E-EV) |
| 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. |
| Detection | Zero Crossing |
| Resolution | +/- 0.00001 in (0.0001 mm) |
| Calibration | Automatic, Fixed, Single or Two-Point zero calibration options |
| 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 |
| Bolt Materials | Select types from a preset or custom list. |
| Physical | |
| Weight | 4.5 lbs (2.04 kgs), with batteries |
| Size | 8.5W x 6.5H x 2.5D in (216 x 165 x 70mm) |
| Op Temperature | 14 to 140F (-10C to 60C) |
| Keyboard | Membrane switch with 21 tactile keys |
| Housing | Extruded aluminum body with nickel plated aluminum end caps (gasket sealed) |
| Display Views | RF (full wave view), +/- Rectified (half wave view), Digits, or split screen combination (wave plus large digits) |
| Environmental | Meets IP65 requirements |
| Connections | |
| USB | Direct USB 1.1 PC connectivity |
| Power Connector | 12v @ 2amps, adapter 100-240 VAC, .7 Amps, 50-60 Hz.5 Pin Lemo (includes):RS232Output – RS232 PC serial interface.Alarm Outputs – Two independent alarm outputs triggered by the gates.Analog Out – Proportional outputs (amplitude or distance), 0-10 volts. |
| Transducer Connectors | Two LEMO 00 connectors |
| Memory | |
| Log Formats | Grid (Alpha Numeric) |
| Capacity | 4 Gb internal & up to 64 Gb External SD slot |
| Screen Capture | Tagged interface file (.tif) capture for quick documentation |
| Custom Setups | 64 user configurations |
| Power Source | |
| 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, 1.2V AA NI-MH, or other other equivalent power source |
| Battery life (continuous use) | Alkaline (12 hrs), Nicad (5hrs), and NI-MH (12hrs), with default settings. |
| Electronics | |
| Display | Blanview sunlight readable QVGA TFT color display (320 x 240 pixels). Viewable area 4.54 x 3.40 in (115.2 x 86.4 mm), or 5.7 in (144.78 mm) diagonal. 16 color pallete, multiple color options and variable brightness |
| Screen Refresh Rate | 60Hz. Timing: Precision TCXO timing with single shot 100 MHz 8 bit ultra low power digitizer. |
| Pulser Types | Spike, Square Wave & Tone Burst.Pulser Voltage: 100 – 400v |
| Pulser Voltage | 100 – 400v |
| Pulse Width | 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. |
| Gain | 0 to 110dB with 0.2dB resolution. Manual and AGC control. |
| Damping | 50, 75, 100, 300, 600, & 1500 ohms. |
| 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 | 0 – 999.999in (25,400mm) at steel velocity |
| Measurement Gates | Three independent gates depending on measurement mode selected, with audible and visual alarms. Amplitude 5-95%, 1% steps. |
| Transducers | |
| Types | Single element – 1 MHz to 10 MHz frequencies, and 1/8” to 1” diameters. Magnetic & Non Magnetic options available |
| Glue-On | Available for short bolts with minimal/short elongations to eliminate transducer placement errors. |
| Connectors | Microdot, Lemo 00, or BNC options depending on the transducer model selected. |
| Custom Transducers | Available for special applications. |
| General | |
| Certification | Factory calibration traceable to NIST & MIL-STD-45662A |
| Warranty | 2 year limited |
