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Summary of Contents for DAKOTA ULTRASONICS PR-82
- Page 1 OPERATION MANUAL DAKOTA ULTRASONICS MODEL PR-8 SONIC TESTER P/N P-102-0004 Rev 1.90, August 2017 GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
- Page 2 Dakota Ultrasonics. Every precaution has been taken in the preparation of this publication. Dakota Ultrasonics assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of information contained herein.
- Page 3 PR-8 Ultrasonic Thickness Gauge CONTENTS NTRODUCTION PERATION EYPAD ISPLAY RANSDUCER AKING EASUREMENTS ONDITION AND REPARATION OF URFACES ROBE ALIBRATION RANSDUCER ELECTION A: P PPENDIX RODUCT PECIFICATIONS B: A PPENDIX PPLICATION OTES C: S PPENDIX OUND ELOCITIES OF OMMON ATERIALS ARRANTY NFORMATION DISCLAIMER Inherent in ultrasonic thickness measurement is the possibility that the...
- Page 4 The last section provides application notes and a table of sound velocity values for various materials. Dakota Ultrasonics maintains a customer support resource in order to assist users with questions or difficulties not covered in this manual. Customer support may be reached at any of the following: GlobalTestSupply www.
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Page 5: Operation
PR-8 Sonic Tester OPERATION The PR-8 interacts with the operator through the membrane keypad and the LCD display. The functions of the various keys on the keypad are detailed below, followed by an explanation of the display and its various symbols. - Page 6 Dakota Ultrasonics The PRB-0 key is used to "zero" the PR-8 in much the same way that a mechanical micrometer is zeroed. If the tool is not zeroed correctly, all of the measurements that the tool makes may be in error by some fixed value.
- Page 7 PR-8 Sonic Tester The UP arrow key has two functions. When the PR-8 is in calibration mode, this key is used to increase numeric values on the display. An auto- repeat function is built in, so that when the key is held down, numeric values will increment at an increasing rate.
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Page 8: The Display
Dakota Ultrasonics The Display The numeric portion of the display consists of 4 complete digits preceded by a leading "1", and is used to display numeric values, as well as occasional simple words, to indicate the status of various settings. - Page 9 PR-8 Sonic Tester When the IN symbol is on, the PR-8 is displaying a thickness value in inches. The maximum thickness that can be displayed is 19.999 inches. When the MM symbol is on, the PR-8 is displaying a thickness value in millimeters.
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Page 10: T He T Ransducer
The transducer connects to the via the attached cable, and two coaxial connectors. When using PR-8 transducers manufactured by Dakota Ultrasonics, the orientation of the dual coaxial connectors is not critical: either plug may be fitted to either socket in the PR-8... -
Page 11: Making Measurements
PR-8 Sonic Tester This is a top view of a typical transducer. Press against the top with the thumb or index finger to hold the transducer in place. Moderate pressure is sufficient, as it is only necessary to keep the transducer stationary, and the wearface seated flat against the surface of the material being measured. - Page 12 Dakota Ultrasonics If the Stability Indicator has fewer than five bars darkened, or the numbers on the display seem erratic, first check to make sure that there is an adequate film of couplant beneath the transducer, and that the transducer is seated flat against the material. If the condition persists, it may be necessary to select a different transducer (size or frequency) for the material being measured.
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Page 13: Condition And Preparation Of Surfaces
PR-8 Sonic Tester Condition and Preparation of Surfaces In any ultrasonic measurement scenario, the shape and roughness of the test surface are of paramount importance. Rough, uneven surfaces may limit the penetration of ultrasound through the material, and result in unstable, and therefore unreliable, measurements. -
Page 14: Probe Zero
Dakota Ultrasonics Probe Zero Setting the Zero Point of the PR-8 is important for the same reason that setting the zero on a mechanical micrometer is important. If the tool is not "zeroed" correctly, all of the measurements the tool makes will be in error by some fixed number. -
Page 15: C Alibration
PR-8 Sonic Tester At this point, the PR-8 has successfully calculated it's internal error factor, and will compensate for this value in any subsequent measurements. When performing a "probe-zero", the PR-8 will always use the sound-velocity value of the built-in probe-disc, even if some other velocity value has been entered for making actual measurements. - Page 16 Dakota Ultrasonics Calibration to a known thickness NOTE: This procedure requires a sample piece of the specific material to be measured, the exact thickness of which is known, e.g. from having been measured by some other means. 1) Make sure the PR-8 is on.
- Page 17 PR-8 Sonic Tester Calibration to a known velocity NOTE: This procedure requires that the operator know the sound- velocity of the material to be measured. A table of common materials and their sound-velocities can be found in Appendix C. 1) Make sure the PR-8 is on.
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Page 18: Two Point Calibration
Dakota Ultrasonics Two Point Calibration NOTE: This procedure requires that the operator has two known thickness points on the test piece that are representative of the range to be measured. 1) Make sure the PR-8 is on. 2) Perform a Probe-Zero (refer to page 12) 3) Apply couplant to the sample piece. -
Page 19: Scan Mode
PR-8 Sonic Tester Scan Mode While the PR-8 excels at making single point measurements, it is sometimes desirable to examine a larger region, searching for the thinnest point. The PR-8 includes a feature, called Scan Mode, which allows it to do just that. -
Page 20: Transducer Selection
Dakota Ultrasonics TRANSDUCER SELECTION The PR-8 is inherently capable of performing measurements on a wide range of materials, from various metals to glass and plastics. Different types of material, however, will require the use of different transducers. Choosing the correct transducer for a job is critical to being able to easily perform accurate and reliable measurements. - Page 21 PR-8 Sonic Tester strength of the waves, and thus, the PR-8 's ability to detect the returning echo. Higher frequency ultrasound is absorbed and scattered more than ultrasound of a lower frequency. While it may seem that using a lower frequency transducer might be better in every instance, low frequencies are less directional than high frequencies.
- Page 22 Dakota Ultrasonics Selection of the proper transducer is often a matter of tradeoffs between various characteristics. It may be necessary to experiment with a variety of transducers in order to find one that works well for a given job. Dakota Ultrasonics can provide assistance in choosing a transducer, and offers a broad selection of transducers for evaluation in specialized applications.
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Page 23: A Ppendix A: P Roduct S Pecifications
PR-8 Sonic Tester APPENDIX A Product Specifications Physical Weight: 10 ounces Size: 2.5W x 4.75H x 1.25D inches (63.5W x 120.7H x 31.8D mm). Operating Temperature: -20 to 120 F (-20 to 50 C) Case: Extruded aluminum body / nickel plated aluminum end caps. - Page 24 PR-8 Sonic Tester APPENDIX B Application Notes Measuring pipe and 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 4 inches, measurements should be made with the transducer oriented so that the gap in the wearface is perpendicular (at right angle) to the long axis of the pipe.
- Page 25 Dakota Ultrasonics above this point, the change in sound velocity of the material being measured starts to have a noticeable effect upon ultrasonic measurement. At such elevated temperatures, it is recommended that the user perform a calibration procedure (refer to page 11) on a sample piece of known thickness, which is at or near the temperature of the material to be measured.
- Page 26 PR-8 Sonic Tester An additional important consideration when measuring laminates, is that any included air gaps or pockets will cause an early reflection of the ultrasound beam. This effect will be noticed as a sudden decrease in thickness in an otherwise regular surface. While this may impede accurate measurement of total material thickness, it does provide the user with positive indication of air gaps in the laminate.
- Page 27 PR-8 Sonic Tester APPENDIX C Sound Velocities of some Common Materials M a te r ia l s o u n d v e lo c ity in /u s m /s A lu m in u m 0 .2 5 0 6 3 5 0 B is m u th 0 .0 8 6...
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Page 28: Warranty Information
Dakota Ultrasonics warrants transducers and accessories against such defects for a period of 90 days from receipt by the end user. If Dakota Ultrasonics receives notice of such defects during the warranty period, Dakota Ultrasonics will either, at its option, repair or replace products that prove to be defective.
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