Elcometer SG80 User manual

Model SG80

Sonic Gauge

Operating Instructions

This product meets the Electromagnetic Compatibility Directive.

These operating instructions are available for download on our website www.elcometerndt.com.

The following trademark is a registered trademark of Elcometer Limited, Edge Lane, Manchester, M43 6BU. United

Kingdom:

All other trademarks acknowledged.

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.

TMA-0507 Issue 01

Text with cover : 23164

Contents

1 About your Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 The Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3 Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4 The Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Setting up the Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6 Measurement - Taking Readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

7 Scan mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

9 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

10 Technical Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

11 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

12 Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

13 Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

14 Condition and Preparation of Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

15 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

16 Sound Velocities of Common Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

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.

1 ABOUT YOUR GAUGE

The Model SG80 is a sonic gauge that measures with extreme versatility. It has the ability to measure the

thickness of a material while maintaining the ability to locate pits, flaws and defects in the material. Based

on the same operating principles as SONAR, the Model SG80 is capable of measuring the thickness of

various materials with accuracy as high as 0.01 millimetres (0.001 inches). The principal advantage of

ultrasonic measurement over traditional methods is that ultrasonic measurements can be performed with

access to only one side of the material being measured.

1.1 STANDARDS

Your gauge can be used in accordance with the following Standards and test methods; ASTM E 797,

EN 14127 and EN 15317.

1.2 WHAT THIS BOX CONTAINS

Model SG80, Bottle of couplant, Battery (2 x), Carrying case, Test certificate, Operating instructions.

Note: The box does not include a transducer; these must be ordered separately. To order a transducer,

contact Elcometer NDT or your local Elcometer NDT supplier.

1.3 PACKAGING

The gauge is packed inside its carry case within a cardboard box. Please ensure that the packaging is

disposed of in an environmentally sensitive manner. 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

have any questions.

2 THE KEYPAD

Key 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:

• Gauge in calibration mode: Increases numeric values on the display (press and hold to

increase quickly).

• Gauge not in calibration mode: Switches the Scan measurement mode on and off.

This key has two functions:

• Gauge in calibration mode: Decreases numeric values on the display (press and hold to

decrease quickly).

• Gauge not in calibration mode: Switches the display backlight between three settings;

on, off and auto (in auto mode the backlight automatically illuminates while the gauge is

making a measurement and switches off after several seconds, conserving battery life).

Press to zero the gauge.

Press to calibrate the gauge.

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3 GETTING STARTED

3.1 FITTING BATTERIES

Your gauge may be used with dry cell batteries or rechargeable

batteries. 2 x LR6 (AA) alkaline batteries are supplied with this gauge.

When the battery voltage is low the entire display will start to flash. When

this occurs the batteries should be replaced.

To fit or replace batteries:

1. Locate battery compartment cover at top of gauge.

2. Unscrew battery compartment cover.

3. Referring to battery polarity instructions on rear of gauge, insert bat-

teries into gauge ensuring correct polarity.

4. Replace battery compartment cover.

Note: Remove the batteries from the gauge if it is to remain unused for

a long period of time. This will prevent damage to the gauge in the event

of malfunction of the batteries.

3.2 CHOOSING THE TRANSDUCER

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

Battery

compartment

cover

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3.3 FITTING THE TRANSDUCER

The transducer transmits and receives ultrasonic sound

waves that the gauge uses to calculate the speed of sound in

the material being measured.

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.

The transducer must be used correctly in order for the gauge to produce accurate, reliable measurements.

The illustration shows the two semicircles of the wearface and

the barrier separating them on a typical transducer.

One of the semicircles transmits ultrasonic sound into the

material being measured, and the other semicircle receives

the sound echoes back into the transducer. When the

transducer is placed against the material being measured, it is

the area directly beneath the centre of the wearface that is

being measured.

3.4 SWITCHING ON/OFF

To switch on or off, press the on/off key .

The gauge will switch off automatically after 5 minutes of inactivity.

Wearface

4 THE DISPLAY

Note: The display will hold the last value measured, until a new measurement is made.

Note: When the battery voltage is low, the entire display will begin to flash. When this occurs, the batteries

should be replaced.

Stability indicator

• 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

Units (IN, MM, IN/µs, M/s)

Measurement value/Text

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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. When the zero point of the

transducer is set, this fixed error value is measured and automatically corrected for in all subsequent

measurements.

Though the gauge will remember the last zero point, it is generally a good idea to set the zero point

whenever the gauge is switched on, as well as any time a different transducer is used. This will ensure that

the zero point of the instrument is always correct.

The zero probe routine must be done prior to calibration.

1. Switch on the gauge and connect the transducer.

2. Remove all couplant from the face of the transducer and check that the

wearface of the transducer is clean and free of any debris.

3. Apply a drop of couplant on the transducer and place the transducer in

steady contact with the probe zero disk (the battery cover located on

the top of the unit), and obtain a steady reading.

The display should show a thickness value, and nearly all the bars of

the stability indicator should be illuminated.

Note: The value that is displayed will change depending on the current

velocity setting in your gauge. Disregard the value displayed; it is not

important. What is important is accurately performing these steps to

ensure reliability of the zero calculation.

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