Elcometer CG20 Manuale utente

Model CG10 & CG20

Corrosion Gauge

Operating Instructions

This product meets the Electromagnetic Compatibility Directive.

The product is Class A, Group 1 ISM equipment according to CISPR 11.

Group 1 ISM product: A product in which there is intentionally generated and/or used conductively coupled radio-frequency

energy which is necessary for the internal functioning of the equipment itself.

Class A product are suitable for use in all establishments other than domestic and those directly connected to a low voltage

power supply network which supplies buildings used for domestic purposes.

Note : In the close presence of some radio transmitters, erroneous readings may be given. If this occurs tests should be

repeated at another location.

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

The following trademarks are registered trademarks of Elcometer Limited, Edge Lane, Manchester, M43 6BU. United

Kingdom:

Material Safety Data Sheets for the ultrasonic couplant supplied with the CG10 & CG20 and available as an accessory, are

available to download via our website:

Elcometer NDT Ultrasonic Couplant Material Safety Data Sheet :

www.elcometerndt.com/images/MSDS/elcometer_ultrasonic_couplant.pdf

Elcometer NDT Ultrasonic Couplant Material Safety Data Sheet :

www.elcometerndt.com/images/MSDS/elcometer_ultrasonic_couplant_hi_temp.pdf

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. TMA-0553 Issue 01

Text with cover: 23730

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 Taking Readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

7 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

8 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

9 Technical Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

10 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

11 Spares & Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

12 Condition and Preparation of Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

13 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

14 Sound Velocities of Common Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Thank you for purchasing this Elcometer product. Welcome to Elcometer NDT.

The Model CG10 and CG20 Corrosion Gauges are world beating products. 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 CG10 and CG20 are corrosion gauges that measure with extreme versatility. They have the

ability to measure coatings and material thickness simultaneously while maintaining the ability to locate pits,

flaws and defects in the material. Based on the same operating principles as SONAR, the Model CG10 and

CG20 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 CG10 and CG20, Bottle of couplant, Battery (2 x), Carrying case, Test certificate, Operating instruc-

tions, CD with sound velocity programming software, RS232 cable and USB Serial converter.

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 Model

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.

CG10

CG20

Press to change units (metric/imperial) CG10

CG20

Switches the display backlight between three settings; on, off and auto.

• ON - backlight is on

• OFF - backlight is off

• AUTO - backlight automatically illuminates while the gauge is making a meas-

urement and switches off after several seconds (to conserve battery life).

CG10

CG20

Press to zero the gauge CG10

CG20

Press to select material type. CG20

,1

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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. Unscrew battery compartment cover.

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

teries into gauge ensuring correct polarity.

3. 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.

Battery

compartment

cover

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Model CG20

3.2 FITTING THE TRANSDUCER

The transducer transmits and receives ultrasonic sound

waves that the gauge uses to calculate the thickness of 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.

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

,100 V



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.

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, and always when a different transducer is used.

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.

4. While the transducer is firmly coupled to the disc, press .

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