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Elcometer SG80 Operating Instructions Manual

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Model SG80
Sonic Gauge
Operating Instructions

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Summary of Contents for Elcometer SG80

  • Page 1 Model SG80 Sonic Gauge Operating Instructions...
  • Page 2 All other trademarks acknowledged. © Elcometer Limited 2011. All rights reserved. No part of this document may be reproduced, transmitted, transcribed, stored (in a retrieval system or otherwise) or translated into any language, in any form or by any means (electronic, mechanical, magnetic, optical, manual or otherwise) without the prior written permission of Elcometer Limited.

  • Page 3: Table Of Contents

    Contents About your Gauge ..............1 The Keypad .

  • Page 4: About Your Gauge

    Thank you for purchasing this Elcometer NDT product. Welcome to Elcometer NDT. The Model SG80 Velocity Gauge is a world beating product. With the purchase of this gauge you now have access to the worldwide service and support network of Elcometer NDT. For more information visit our website at www.elcometerndt.com.
  • Page 5 Consult your Local Environmental Authority for further guidance. To maximise the benefits of your new Elcometer NDT gauge, please take some time to read these Operating Instructions. Do not hesitate to contact Elcometer NDT or your Elcometer NDT supplier if you...

  • Page 6: The Keypad

    2 THE KEYPAD Functions Press to switch the gauge on or off. When switching off, the gauge retains all of its settings. If the gauge is idle for 5 minutes, it will switch itself off. Press to change units (metric/imperial) This key has two functions: •...

  • Page 7: Getting Started

    When you purchased your gauge you should have also purchased a suitable transducer for your application. If you have not yet done so, refer to “Transducers” on page 22, which will help you identify the correct transducer type. Alternatively contact Elcometer NDT, your local Elcometer NDT supplier or visit www.elcometerndt.com...
  • Page 8 The transducer connects to the gauge via the attached cable, and two coaxial connectors. When using transducers manufactured by Elcometer NDT, the orientation of the dual coaxial connectors is not critical; either plug may be fitted to either socket.

  • Page 9: The Display

    4 THE DISPLAY Stability indicator Units (IN, MM, IN/µs, M/s) • One vertical bar - no readings are being taken • Less than 5 bars - read- ing is unstable and may be inaccurate • More than 5 bars - read- ing is stable Measurement value/Text Note: The display will hold the last value measured, until a new measurement is made.

  • Page 10: Setting Up The Gauge

    5 SETTING UP THE GAUGE 5.1 TRANSDUCER - ZEROING Setting the zero point for the transducer is important for the same reason that setting the zero on a mechanical micrometer is important. If the zero point of the transducer is not set correctly, all of the measurements the gauge makes will be in error by some fixed number.
  • Page 11 4. While the transducer is firmly coupled to the disc, press The display will show ‘Prb0’ while it is calculating its zero point. When the probe zero is completed the measurement screen is displayed. 5. Remove the transducer from the probe zero disk. Your gauge should now be calibrated.
  • Page 12 To achieve the most accurate measurements possible, it is generally advisable to calibrate the gauge to a sample piece of known thickness. Material composition (and thus, its sound-velocity) sometimes varies from lot to lot and from manufacturer to manufacturer. Calibration to a sample of known thickness will ensure that the gauge is set as closely as possible to the sound-velocity of the material to be measured.
  • Page 13 4. Press On the display, MM (or IN) starts flashing on and off. 5. Use the arrows to adjust the displayed thickness until it matches the thickness of the sample of material. 6. Press again. On the display, M/s (or IN/µs) starts flashing on and off. The gauge now displays the sound velocity value it has calculated based on the thickness of the sam- ple piece.
  • Page 14 3. Having achieved a stable reading, remove the transducer. If the displayed value changes from the value shown while the transducer was coupled, repeat the previous step. 4. Press On the display, MM (or IN) will start flashing on and off. 5.
  • Page 15 5.2.2 Known Velocity Calibration If the material velocity is known, you can enter the velocity value directly into the gauge. A list of the sound velocities of common materials is given at the end of this instruction manual. Note: Before you start this calibration procedure, perform a probe zero. 1.

  • Page 16: Measurement - Taking Readings

    6 MEASUREMENT - TAKING READINGS Disclaimer: Inherent in ultrasonic thickness measurement is the possibility that the instrument will use the second rather than the first echo from the back surface of the material being measured. This may result in a sound-velocity reading that is HALF what it should be. Responsibility for proper use of the instrument and recognition of this phenomenon rests solely with the user of the instrument.
  • Page 17 2. Place transducer onto the surface of the material to be measured Press the transducer wearface into the couplant. Moderate pressure on the top of the transducer using the thumb or index finger is sufficient; it is only necessary to keep the transducer stationary and the wearface seated flat against the surface of the material.

  • Page 18: Scan Mode

    7 SCAN MODE In normal operation, your gauge performs and displays four measurements every second, which is quite adequate for taking a measurement at a single point. It is sometimes desirable however to examine a larger region, searching for the thinnest point. Your gauge includes a feature, called Scan Mode, which allows it to do just that.

  • Page 19: Storage

    The gauge does not contain any user-serviceable components. In the unlikely event of a fault, the gauge should be returned to your local Elcometer NDT supplier or directly to Elcometer NDT. The warranty will be invalidated if the instrument has been opened.

  • Page 20: Technical Specification

    10 TECHNICAL SPECIFICATION Measurement Rate Manual 4 readings per second Scan mode 16 readings per second Sound Velocity 1250 m/s to 10000 m/s (0.0492 in/µs to 0.3930 in/µs) Measuring Range Thickness 0.63 mm to 500 mm (0.025” to 19.999”) Measurement Resolution Sound Velocity 1 m/s (0.0001 in/µs) Thickness...

  • Page 21: Warranty

    Additionally, Elcometer NDT warrants transducers and accessories against such defects for a period of 90 days from receipt by the end user. If Elcometer NDT receives notice of such defects during the warranty period, Elcometer NDT will either, at its option, repair or replace products that prove to be defective. The warranty will be invalidated if the instrument has been opened.
  • Page 22 11.2 OBTAINING SERVICE DURING WARRANTY PERIOD If your hardware should fail during the warranty period, contact Elcometer NDT and arrange for servicing of the product. Retain proof of purchase in order to obtain warranty service. For products that require servicing, Elcometer NDT may use one of the following methods: •...

  • Page 23: Spares

    Your gauge is complete with all the items required to get started and take measurements (transducers must be ordered separately). Over the life of the gauge replacement items may be required. The following replacement and optional items are available from your local Elcometer NDT supplier or directly from Elcometer NDT.

  • Page 24: Transducers

    13 TRANSDUCERS Your gauge is capable of performing measurements on a wide range of materials, from various metals to glass and plastics. Different types of material, however, have different properties. The following paragraphs highlight the important properties of transducers which should be considered when assessing a particular measurement task.
  • Page 25 For full details of the Elcometer NDT range of transducers contact your local Elcometer NDT supplier, or visit the Elcometer NDT website www.elcometerndt.com...

  • Page 26: Condition And Preparation Of Surfaces

    14 CONDITION AND PREPARATION OF SURFACES The shape and roughness of the test surface are of paramount importance when carrying out ultrasonic thickness testing. Rough, uneven surfaces may limit the penetration of ultrasound through the material, and result in unstable, and therefore unreliable, measurements. The surface being measured should be clean, and free of any small particles, rust, or scale.

  • Page 27: Application Notes

    15 APPLICATION NOTES 15.1 MEASURING TUBING When measuring a piece of pipe to determine the thickness of the pipe wall, orientation of the transducers is important. If the diameter of the pipe is larger than approximately 100 mm (4”), measurements should be made with the transducer oriented so that the gap in the wearface is perpendicular (at right angles) to the long axis of the pipe.
  • Page 28 At such elevated temperatures, it is recommended that the user perform a calibration procedure on a sample piece of known thickness, which is at, or near, the temperature of the material to be measured. This will allow the gauge to correctly calculate the velocity of sound through the hot material. When performing measurements on hot surfaces, it may also be necessary to use a high-temperature transducer.

  • Page 29: Sound Velocities Of Common Materials

    16 SOUND VELOCITIES OF COMMON MATERIALS Sound velocity Sound velocity Material Material (m/s) (in/µs) (m/s) (in/µs) Aluminium 6350 0.250 Paraffin 2210 0.087 Bismuth 2184 0.086 Platinum 3962 0.156 Brass 4394 0.173 Plexiglas 2692 0.106 Cadmium 2769 0.109 Polystyrene 2337 0.092 Cast Iron 4572 0.180 (Approx.)

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