Call +44 (0) 845 500 5556 or email sales@boltight.com
Echometer Ultrasonic Measurement
Using the latest ultrasonic technology the Boltight Echometer is a fast and accurate way to measure bolt load and bolt elongation.
The Boltight Echometer uses ultrasonics to measure the elongation, stress and load in fasteners. It offers quick and accurate measurements with readings displayed on an easy to read screen. The unit works with all bolt tightening systems and is used to monitor the fastener during the tightening process to ensure accurate initial loading. The retained load in the fastener can then be monitored at any time.

Echometer minimises the requirement for extensive operator training. With built in data recording and reporting through a USB interface, the device is quick and easy to use and offers a reliable solution to the most difficult bolting problem.
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  HOW IT WORKS

Quick, easy and highly accurate
The Echometer measures the time of flight of a sound wave as it travels through a fastener. A sound wave is created when an electrical pulse is applied to a piezoelectric element inside a transducer placed on the end face of the bolt.

When the ultrasonic sound wave encounters an abrupt change in density, such as the end of the fastener, the wave reflects. This reflection travels back through the length of the fastener and back into the transducer. When the sound wave enters the piezoelectric element, a small electrical signal is produced. This signal is used to stop a timing counter.

Ultrasound travels in a fastener at a constant speed (the acoustic veloicty) determined by the material type. Therefore the time divided by 2 and multiplied by the acoustic velocity of the material gives the acoustic length of the bolt

A measurement is taken before the bolt is tightened, and then after the bolt is tightened. The difference between the two readings is the bolt's elongation!

The Echometer can be calibrated to also read in units of Load, Stress and Strain.

Example:
Before:112.35 mm
After:113.45 mm
Difference 1.1 mm

... therefore the bolt has stretched 1.1 mm

   WHY ULTRASONIC?

The Ultrasonic method offers several benefits, including…
• Speed of taking measurement
• Accuracy
• Permanent electronic record
• In service monitoring
• Difficult access bolts

Most fasteners are suitable for ultrasonic measurement.

There are a few requirements…
• Flat ends - the bolt ends must be flat and parallel
• Surface finish - the bolt ends must have a reasonable surface finish
• Material must conduct ultrasound - not a problem for typical bolting steels
• Significant stretch bolts with very, very short effective lengths are not suitable

  TECHNICAL DATA

The Echometer ultrasonically measures the elongation, stress and load in fasteners, quickly and accurately, and displays the result on an easy to read screen.

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 unit works with all bolt tightening systems and is used to monitor the fastener during the tightening process to ensure accurate initial loading. The retained load in the fastener can then be monitored at any time .

Echometer minimises the requirement for extensive operator training. With built in data recording and reporting through an RS232 interface, the Echometer is quick and easy to use and offers a reliable solution to the most difficult bolting problem.

• Simple to operate.
• Compact and durable for proven reliability.
• Minimal operator training required.
• Provides elongation, load, stress and strain measurements.
• Accurate and reliable.
• Designed to complement Boltight bolt tensioning
• Easy measure during tightening and monitoring during plant operation
• Cost effective
• Simple data recording and reporting
Specifications
Physical
Width(2.5in/63.5mm)
Height (6.5in/165mm)
Depth(1.24in/31.5mm)

Weight
0.4kg (with batteries)

Keyboard
Membrane switch pad with twelve tactile keys

Operating Temperature
14°F to 140°F (-10°C to 60°C)

Case
Extruded aluminium body with nickel-plated aluminium end caps(gasket sealed)

Data Output
Bi-directional RS232 serial port.
Windows® PC interface software.

Display
1/8in VGA grayscale display (240 x 160 pixels)
Viewable area 2.4 x 1.8in (62 x 45.7mm
EL Backlit (on/off/auto)

Ultrasonic Specifications Measurement
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
Units
Imperial and Metric

Display
A-Scan: Rectified +/- (half wave view), or RF (full waveform view)

Limits Bar(Alarm Limits)
Set Hi & Lo alarm limits for displaying an acceptable tolerance range.
Repeatability Bar Graph- Bar Graph indicates stability of measurement.

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
16 megabit non-volatile ram

Transducer Types
Single element (1 to 10MHz & 1/8"to 1" diameters).
Locking quick disconnect "00" LEMO connectors.
Standard 10 foot cable.
Custom transducers and cable lenghts available on request.
Temperature probe for automatic and temparature compensation.

Alarm Limits
Set Hi and Lo tolerances with audible beeper, viewable scan bar and visual LEDS).
Power Source
Three 1.5V alkaline or 1.2V NiCad AA cells
Typically operates for 150 hours on alkaline and 100 hours on NiCad
Auto power off if idle 5 min
Battery status icon

Range
From 1" to 96" ( 25.4mm to 2435mm) length bolts.

Time
Nanoseconds

Elongation
Change in length (Change in length)

Load
Force load applied (pounds kip or kilo newtons kN)

Stress
Force per unit area stress (pounds kpsi or mega pascals Mpa).

Strain
Percentage strain applied (inches per inch or millimeters per millimeter)

Resolution
+/- 0.00001 inches (0.0001 mm)

Velocity Range
0.0492 to 0.3936 in/ms
1250 to 9999 meters/sec
Fixed, Single and Two point zero calibration options
Select bolt material types from a preset or custom list


  SERVICE AND TRAINING

Boltight offers Echometer ultrasonic bolt load measurement as a service. Our experienced engineers provide the necessary skill and knowledge to verify bolt loads during construction and maintenance projects. Working alongside our customers bolt tightening methods and procedures are reviewed to ensure best practice.

The Echometer provides the clarification that target bolt loads and elongations have been achieved, ensuring correct tightening of the bolted joint. Documentation, reports and bolting databases can be maintained as per your requirements to meet QA requirements.

Echometer training is available on-site or at our Boltight training facilities to give technicians the necessary skills to use ultrasonic measurement competently. Our training courses can be tailor-made to suit the particular customer requirements.

Consulting services are available for any facet of bolted joint design. Boltight engineers can advise on best practice for required bolt loads, flange stress calculations, tightening procedures, as well as bolt load verification using Echometer ultrasonic measurement. Boltight can also offer specific materials calibration as well as annual calibration services. Please contact us for further details.

  DOWNLOADS

Data Sheets
Click on a data sheet to open a pdf file in a new window
Software Updates
Additional Information
Boltight Limited
Unit 2 Junction 10 Business Park
Bentley Mill Way
Walsall
West Midlands
WS2 0LE
United Kingdom
Tel: +44 (0) 845 500 5556
Fax: +44 (0) 845 500 5557
email: sales@boltight.com

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BOLTIGHT is the registered trademark of Boltight Limited

VAT Number: GB 748 1351 28

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