Elcometer CG30 Manuel utilisateur

Model CG30

Model CG50, CG50DL

Corrosion Gauge

Operating Instructions

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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.

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.

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.

.Doc.No. TMA-0497 Issue 01

Text with Cover No: 23195

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Contents

1 About your gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 The keypad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Getting started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4 The display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 Setting up the gauge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Taking a reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7 Measurement options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

8 Measurement - Recording your Readings (CG50DL only) . . . . . . . . . . . . . . . . . . . . . . 15

9 Transferring readings to a computer - CG50/CG50DL only . . . . . . . . . . . . . . . . . . . . . 17

10 Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

11 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

12 Technical specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

13 Spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

14 Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

15 Transducers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

16 Condition and preparation of surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

17 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

18 Sound velocities of common materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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

The Model CG30, CG50 and CG50DL Ultrasonic Thickness 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 CG30, CG50 and CG50DL Ultrasonic Thickness Gauges are handheld gauges for fast

and accurate measurement of material thickness.

Your gauge is capable of measuring the thickness of various materials with accuracy as high as

± 0.1 mm (± 0.004"). The principal advantage of ultrasonic measurement over traditional methods

is that ultrasonic measurements can be performed with access to onlyone side of the material being

measured.

There are three versions of the gauge:

• The Model CG30 is the basic model.

• The Model CG50 includes all features of the CG30 plus differential mode, an alarm and data

output.

• The Model CG50DL model includes all the features of the Model CG50 model plus a

data-logging (memory) facility which allows readings to be stored in batches before being

downloaded to a computer.

This manual describes the operation of all three models - CG30, CG50 and CG50DL.

1.1 STANDARDS

The Models CG30, CG50 and CG50DL can be used in accordance with the following International

Standards ASTM E 797, EN 14127 & EN 15317.

1.2 WHAT THIS BOX CONTAINS

Model CG30, CG50 or CG50DL Gauge, Bottle of couplant, Battery, (2 x), Carrying case, Test

certificate, Operating instructions, CD with data transfer and data collection software - CG50DL

only, RS232 and USB to Serial converter CG50DL only.

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.

To maximise the benefits of your new Elcometer NDT Ultrasonic Thickness 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.

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1.3 PACKAGING

Your gauge is packed inside its carrying case within a cardboard box. Please ensure that this

packaging is disposed of in an environmentally sensitive manner. Please consult your Local

Environmental Authority for further guidance.

Figure 1. Models CG30 - CG50 - CG50DL

CORROSION GAUGE

CAL PRB

SCAN

CLR

MEM

SEND

MODE

CAL

PRB

Model CG30 Model CG50 Model CG50DL

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2 THE KEYPAD

MODEL CG30 (6 BUTTONS) AND CG50 (9 BUTTONS)

MODEL CG50DL

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.

CG30

CG50

Press to zero the gauge.

See “Transducer - Zeroing” on page 8. CG30

CG50

Press to adjust calibration.

See “Calibration” on page 9. CG30

CG50

Press to change units (metric/imperial) CG30

CG50

a) Increases values on the display

(press and hold to change values quickly). CG30

CG50

b) Switches SCAN measurement on and off.

See “Scan mode” on page 12.

a) Decreases values on the display

(press and hold to change values quickly). CG30

CG50

b) Switches the display backlight between three settings; on, off and auto. See “Backlight”

on page 15.

a) Press and hold when switching the gauge on to switch the audible beeper on or off. CG50

b) Press to toggle the alarm on or off, and to adjust the nominal thickness value. See

“Alarm - CG50 and CG50DL only” on page 13.

Press to toggle the DIFFERENTIAL mode on or off, and to adjust the nominal thickness

value.

See “Differential Mode - CG50 and CG50DL only” on page 13. CG50

Press to send the displayed thickness measurement to an external storage device via the

RS232 port.

See “Transferring readings to a computer - CG50/CG50DL only” on page 17. CG50

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 zero the gauge.

See “Transducer - Zeroing” on page 8.

Press to adjust calibration.

See “Calibration” on page 9.

Press to adjust the features and settings of the gauge (alarm, scan, units, backlight, and beeper).

PRB

MODE

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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 in the kit.

To fit or replace batteries:

1. Locate battery compartment cover (Figure 2) at top of

gauge.

2. Unscrew battery compartment cover.

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

insert batteries 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.

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

flash. When this occurs the batteries should be replaced.

Note: Alkaline batteries must be disposed of carefully to avoid

environmental contamination. Please consult your local

environmental authority for information on disposal in your region.

Do not dispose of any batteries in fire.

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 20, which will help you

a) Increases values on the display

(press and hold to change values quickly).

b) Scrolls up through features and settings of the gauge and through files, memory locations, and

functions of the data logger.

a) Decreases values on the display

(press and hold to change values quickly).

b) Scrolls down through features and settings of the gauge and through files, memory locations, and

functions of the data logger.

Press to switch on/off data logging (memory).

See “Measurement - Recording your Readings (CG50DL only)” on page 15.

Press when data logger is switched on to clear the contents of an entire batch, or an individual

memory location.

The CLR key is also used to send an obstruct message (ObSt) to an individual memory location. The

ObSt symbol would indicate that the user was unable to take a reading at a particular location.

See “Measurement - Recording your Readings (CG50DL only)” on page 15.

Press to send the displayed thickness measurement to an internal memory location or an external

storage device via the RS232 port.

See “Data Transfer Software” on page 17.

The SEND key is also used to select data logging functions in the Model CG50DL.

MEM

CLR

SEND

Elcometer 208

Ultrasonic Thickness Gauge

CAL

SEND

ALRM

PRB

MM ON

OFF

SCAN

DUAL

MULTI

Elcometer 206

Ultrasonic Thickness Gauge

CAL

SEND

ALRM

DIFF

PRB

MM ON

OFF

SCAN

Battery

compartment

cover

Figure 2. Fitting batteries

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identify the correct transducer type. Alternatively contact Elcometer NDT, your local Elcometer NDT

supplier or visit www.elcometerndt.com.

3.3 FITTING THE TRANSDUCER

The transducer transmits (see Figure 3) 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.

Figure 4 shows the two semicircles of the wearface

and the barrier separating them. 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.

Figure 3. Typical transducer

Wearface

Figure 4. Transducer - bottom view

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4 THE DISPLAY

Stability indicator

Refer to “Read display” on page 12 and “Transducers” on page 20 for information on how to

achieve a stable measurement.

4.1 FRONT PANEL LIGHTS (CG50 & CG50DL ONLY)

Green light illuminates when:

• The alarm mode is active, and

• the measured thickness is greater than the alarm value.

Red light illuminates when:

• The alarm mode is active, and

• the measured thickness is less than the alarm value.

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.

One bar - no readings are being taken

Less than 5 bars - reading is unstable and may be

inaccurate

More than 5 bars - reading is stable

INMM/ s

Stability

indicator

(see

below)

Units

(IN, MM

IN/µs,

MM/s)

Thickness value/

Menu items

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To set the zero point:

1. Plug the transducer into the gauge ensuring that the connectors are fully engaged. Check that

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

2. Switch on the gauge.

3. The battery compartment cover on the top end of the gauge acts as a metal ‘probe-disc’. Apply

a single droplet of ultrasonic couplant to the top of this disc.

4. Press the transducer against the probe-disc, making sure that the transducer is flat against the

surface (Figure 5). The display should show some thickness value, and nearly all the bars of

the stability indicator should be illuminated.

Figure 5. Transducer pressed against probe-disc

5. While the transducer is firmly coupled to the probe-disc, press the PRB-0 key on the keypad.

The gauge will display ‘Prb0’ while it is calculating the zero point.

6. Remove the transducer from the probe-disc.

When setting the zero point, the gauge will always use the sound-velocity value of the built-in

probe-disc, even if some other velocity value has been entered for making measurements.

Although 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.

5.2 CALIBRATION

In order for the gauge to make accurate measurements, it must be set to the correct sound-velocity

for the material being measured.

Different types of material have different sound-velocities. For example, the velocity of sound

through steel is 5918 m/s (about 0.233 in/µs) and the velocity of sound through aluminium is 6350

m/s (about 0.248 in/µs).

If the gauge is not set to the correct sound-velocity, all of the measurements the gauge makes will

be erroneous by some fixed percentage.

There are three methods of calibrating your gauge:

One-point CALIBRATION: This is the simplest and most commonly used calibration procedure -

optimising linearity over large ranges. One-point calibration is carried out using a known thickness.

Two-point CALIBRATION: This allows for greater accuracy over small ranges. Two-point

calibration is carried out using two known thicknesses.

Known velocity CALIBRATION: The sound-velocity of the material being measured is entered

directly into the gauge.

Note: One-point and two-point calibrations must be performed on material with the paint or coating

removed. Failure to remove the paint or coating prior to calibration will result in a multi-material

velocity calculation that may be different from the actual material velocity intended to be measured.

Elcometer 208

Elcometer 206

CG30_CG50_CG50DL_TMA_0497_00_01_A6L.fm Page 9 Wednesday, November 16, 2011 3:47 PM

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