Ultrasonic Bolt Measurement

Features

Setups: 64 custom user defined setups; Factory setups can also be edited by the user.

Gate: Used to fine adjust where the detection point occurs.

Alarm Limits: Set Hi and Lo tolerances with audible beeper, viewable scan bar, and visual LEDs.

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 and linear regression.

Certification: Factory calibration traceable to national standards.

• The FIRST cost-effective ultrasonic solution available on the market.
• EFFECTIVELY monitor your bolts during periodic shutdowns over the service life of the fastener.
• VISUALLY compare the unloaded to the loaded waveform.
• MEASUREMENT QUANTITIES—Time (nanoseconds), Elongation, Load, Stress, and % Strain.
• DISPLAY OPTIONS—RF, Rectified, Large Digits with Limits Bar.
• DISPLAY RESOLUTION—1/8-inch VGA 240 x 160 pixels.
• STORES 8,000 readings and waveforms in multiple groups.
• BUILT-IN linear regression or vector for optimizing load measurements.
• AUTO SET feature automatically optimizes detection and adjusts display.
• HI/LO ALARM tolerance limits work in conjunction with the data port and external pump shut-off device.

As design engineers push the envelope to provide greater strength and efficiency in bolted joints, the use of torque, torque and angle, or even tensioning as the method of tension control may not be adequate, leading to costly failures. In those applications, ultrasonic bolt elongation / load measurement is able to provide accuracy equal to strain gauging without the need to instrument the bolts. In addition, the use of ultrasonic bolt measurement allows the user to return at any time and re-verify the level of tension in each fastener over its service life. The UT2 has been both laboratory- and field-proven to be the most accurate, reliable, and cost-effective solution to bolting failures, which could place workers at risk, lead to the loss of production, and/or cause damage to capital and equipment.

The basic principle behind this method of tension control is similar to sonar. The ultrasonic measurement of bolt tension is achieved by introducing a sonic pulse at one end of the fastener and accurately measuring the time of flight (TOF) required for the echo to return from the opposite end. Using material constants, the UT2 converts this TOF into an “acoustic length" of the fastener, providing a baseline from which future measurements will be made. When the fastener is tightened, the TOF increases and the SSM-3 will again utilize material constants to eliminate the effects of stress and temperature variations on sound velocity, providing an accurate elongation of load measurement.

The UT2 uses state-of-the-art hardware and digital signal processing to achieve these measurements with maximum automation, minimizing the need for operator interpretation. Once measurements have been recorded to the non-volatile UT2 internal memory, the included SonicBolt software will transfer the data to a PC computer for backup of files, creation of project reports, and conversion of data to Excel® format for further analysis. In addition, the analog signal output and optional controller enables the UT2 to automatically shut off powered torque and tensioning tools based on elongation of load, in even the most demanding applications.

Ultrasonic Stress Meter

• Large 1/4 VGA backlit display is easily visible from a distance and in poor light.
• Can store up to 4,000 bolts, 20,000 elongation and load readings.
• Rugged steel and aluminum case designed for production, field, and construction environments.
• USM-3 is supplied in a rugged, watertight (Pelican®) case complete with AC adaptor, nylon carrying case, 10-foot (approx. 3m) transducer cable, RS232 data transfer cable, 4-oz bottle of couplant, batteries, and operator's handbook.
• Measures fasteners of virtually any material from 1/2 inch (12mm) to over 50 feet (15m) in length.
• 0–10V analog output for control of tightening tools such as a Norbar Pneutorque® multiplier.
• Fast update speeds.
• Measurement modes of pitch-catch and pulse-echo.
• Unit can be operated with main power supply (96 to 264 Volts) or via 4 'C' cell batteries.
• Sealed membrane keypad with tactile keys.
• Works with magnetic and glue-on transducers from 1 MHz to 10 MHz.

Resolution: 0.00001 inch (0.0001 mm)
Weight: 2.25 Kg (4.95 lb) with batteries
Dimensions: 7-1/16" high x 9-7/16" wide x 2-1/16" deep
(180mm high x 239mm wide x 53mm deep)