Model UG20DL

Underwater Thickness 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 instrument and available as an accessory, areavailable to download via our website:
Elcometer Ultrasonic Couplant Material Safety Data Sheet:www.elcometer.com/images/MSDS/elcometer_ultrasonic_couplant.pdf
www.elcometer.com/images/MSDS/elcometer_ultrasonic_couplant_blue.pdf

All other trademarks acknowledged. © Elcometer Limited. 2011-2014. 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 formor by any means (electronic, mechanical, magnetic, optical, manual or otherwise) without the prior written permission of
Elcometer Limited.
TMA-0515 Issue 03
Text with cover: 23212

1 About your Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Safe use of your Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4 The Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 The Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Measurement - Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7 Setting up the Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8 Measurement - Taking Readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9 ThruPaint™ Measurement Technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
10 Measurement Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
11 Measurement - Recording your Readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
12 Data Transfer Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
13 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
14 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
15 Technical Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
16 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
17 Spares & Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
18 Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
19 Condition and Preparation of Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
20 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
21 Sound Velocities of Common Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
22 The Menu Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

enThank you for purchasing this Elcometer NDT product. Welcome to Elcometer NDT.
The Model UG20DL Underwater Thickness Gauge is a world beating product. With the purchase of thisgauge 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 GAUGEThe Model UG20DL is an underwater thickness gauge that measures with extreme versatility. It has theability 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 UG20DL
is capable of measuring the thickness of various materials with accuracy as high as 0.01 millimetres(0.004 inches). The principal advantage of ultrasonic measurement over traditional methods is thatultrasonic measurements can be performed with access to only one side of the material being measured.
The Model UG20DL includes a data-logging (memory) facility which allows readings to be stored in thememory before being downloaded to a computer.
1.1 STANDARDSYour 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 UG20DL, Bottle of couplant, Battery (3 x), Carrying case, Operating instructions, CD with software toenable you to transfer your readings and settings to and from a PC, PC connection cable.
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en
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en

2 SAFE USE OF YOUR GAUGEThis gauge is suitable for use underwater at depths of up to 300 m (1000 ft) provided that thefollowing conditions are followed:

2.1 CARE OF THE HOUSING
1. Keep the gauge out of direct sunlight as much as possible to avoid any potential crazing or stresscracking of the housing, as well as discolouration.
2. Protect the housing from impact.
3. Submerge or rinse the enclosure and transducers in fresh water following use.
4. Do not exceed the depth limitation of 300 m (1000 ft). Failure to adhere to this warning may result inleakage, potential implosion and serious injury.
2.2 CARE OF THE HOUSING SEALS
The housing is sealed by o-rings, one on each end cap, which require meticulous care. In order to maintaina watertight seal, the o-rings and their mating surfaces must be clean, free of foreign material and lubricatedwith silicone grease.
The following procedure must be performed on the end cap o-rings before each use:
1. Clean all old silicone grease from o-rings and mating surfaces using paper towels.
2. Inspect o-rings for foreign material (sand, seaweed, hair, etc.), cracks, cuts, soft spots, or deformities.
Replace o-ring if damaged. Inspect mating surfaces for scratches, rough spots, dents, or cracks.
3. Using a finger, apply a thin, even coat of silicone grease to o-rings on each end cap. Inspect to be surethe o-ring has been properly fitted, and screw the end cap back in place, until it has a snug fit.
3

en

3 GETTING STARTED
3.1 FITTING BATTERIESYour gauge may be used with dry cell batteries or
rechargeable batteries. 3 x LR6 (AA) alkaline batteries aresupplied 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. Remove the bottom end cap.
The battery compartment cover is revealed
You may need to use some pliers or grips with a clothto protect the plastic if the cap is very stiff.
2. Use a screwdriver to unscrew the battery compartment
cover.
3. Insert batteries into gauge ensuring correct polarity.
Note: When inserting batteries into the battery tube,
ensure the positive (+) battery terminal is facing up
towards the battery compartment cover - see illustration. Incorrect insertion may damage to the gauge.
4. Replace battery compartment cover.
5. Referring to “Care of the housing seals” on page 3,
replace the bottom end cap.

Bottom End Cap

Battery
compartment
cover

4

en
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 FITTING THE TRANSDUCER
The transducer transmits and receives ultrasonic sound waves that the gauge uses to calculate thethickness of the material being measured.
Fitting a dual element transducer: Connect the plugs ofa dual element transducer to the sockets on the top end capof the gauge. When using transducers manufactured by
Elcometer NDT, the orientation of the dual connectors is notcritical; either plug may be fitted to either socket.

Dual element transducer
sockets

Top End Cap
Fitting a single element transducer: Connect the plug ofa single element transducer to the socket on the top end capof the gauge as shown in the illustration. A special dongle
must be fitted to the other socket as shown. Failure to fit thetransducer plug and dongle as shown will result in thegauge not identifying the transducer correctly.

Single element transducer
socketDongle socket

Top End Cap

5en
3.3 SWITCHING ON/OFF
To switch on, press the control button on the top end cap.
To switch off, press and hold the control button. After approximately
10 seconds, POWER OFF is displayed and the gauge will then switch
off. Once the gauge has switched off, release the button.
Control button
The gauge will switch off automatically after 4 minutes of inactivity. Itshould be noted that if the transducer face is not wiped clean, there isa chance an echo can continuously be detected. If that happens, thegauge will remain on until the battery life is exhausted. In this instance,
switch off the gauge manually as described above.

Top End Cap

6en

4 THE CONTROLSYour gauge is operated by a single button on the top end cap. There are three methods of pressing the
button:
MethodActionPress and Short
Hold

Enters into, or
exits out of themenu structure.

Notes
If entering into the menu structure, Enter is displayed, followed by scrolling through the top level menu items.
If exiting the menu items, Exit is displayed, and then the display shows either the current storage location (i.e. A1), or

MEMOFF if data storage has been disabled.
Once either instance has occurred, the button must be released.
Press and Release Selects a menu
item.

To select a top level menu item, press and release the button.
The submenu items will begin scrolling on the display.
To select a submenu item, press and release again.

Press and Long
Switches theHold (10 seconds) gauge on andoff.

See “Switching on/off” on page 6.

7

en

5 THE DISPLAYYour gauge is equipped with two LCD displays.
• One display shows the gauge settings andmemory location menu items.
• The other display shows measurement readings.

Measurement
readings
Settings andmemory8

en
5.1 GAUGE SETTINGS AND CONTROL DISPLAY
The gauge settings and memory locations are displayed as a set of top level menu items, each of which has
one or more submenu items.
There are two menu structures used by the gauge. Choice of menu structure is determined automaticallyby the gauge and depends upon the type of transducer fitted to the gauge; dual element type or single
element membrane type.
5.1.1 Menu Structure - Dual Element Type Transducer

STORE DIRECT CLEAR
A1

9

NORTH
SOUTH
EAST
WEST

LOC

ZERO

GAIN

AUTO
VLOW
MANUAL LOW
COATIN MED
HIGH
VHIGH

MATL

UNITS

ALU
IN
STL
MM
STST
IRON
CIRO
PVC
PLST
PLUR
CUSTOM

MODE
P-E
PECT
E-E

UG20DL
LT ON
LT OFFLT AUTOMEMOFFen
5.1.2 Menu Structure - Single Element Membrane Type Transducer

STORE DIRECT CLEAR
A1

NORTH
SOUTH
EAST
WEST

LOC

MATL

UNITS

ALU
IN
STL
MM
STST
IRON
CIRO
PVC
PLST
PLUR
CUSTOM

MODE
E-E-E

UG20DL
LT ON
LT OFFLT AUTOMEMOFF

In order to simplify operation of the gauge, some of the menu items listed above will not be visible. Visibility
depends upon the gauge settings:•

If MEMOFF is selected (if you do not want to store measurements), the data logging section of thegauge is disabled. As a result, MEMOFF moves to the first top level menu option (in place of STORE)
and DIRECT and CLEAR are disabled and not displayed.

•

If a custom material type has not been uploaded into the gauge, CUSTOM is disabled and not displayed in the MATL submenu.

10en
The current settings of the gauge are displayed when it is switched on and then every 30 seconds. This
provides visual confirmation of the settings at any time without having to scroll through the menus to findthe values of the settings. The gauge settings are displayed in the following order:
Gauge Model
UG20DL
Battery Status
LO, MED, or HI
Transducer Type Identified
1/2 5, 1/2 3.5, 1/2 2 S or 1/2 5 S
Measurement Mode
P-E, PECT, E-E or E-E-E
Current Gain Setting
VLOW, LOW, MED, HIGH or VHIGH
Material Type
ALU, STL, STST, IRON, CIRO, PVC, PLST, PLUR, or CUSTOM
5.1.3 How to Select an Item in a Submenu
1. Press and hold the control button until the top level menu items begin scrolling, then release the button.
2. When the required top level menu item is displayed, immediately press and release the control button.
The submenu items begin scrolling.
3. When the required submenu item is displayed, immediately press and release the control button.
The submenu item is selected and is identified by a comma mark in the top left
corner of the display - in the example shown MED is selected.
4. Optional: Press and hold the control button to escape out of the menu items at
any time.

11en
5.2 MEASUREMENTS DISPLAY
Stability indicator•••

One vertical bar - noreadings are being takenLess than 5 bars - reading is unstable and may
be inaccurate
More than 5 bars - reading is stable

Units (IN, MM, IN/µs, M/s)

,100V

Measurement value/Text

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.

12

en

6 MEASUREMENT - MODES
Your gauge has two basic measurement modes, Pulse-Echo and Echo-Echo, plus other variations on thesemodes for specific measurement tasks.
If an auto identified transducer is fitted to the gauge the appropriate mode will be automatically set.
To select measurement mode:Use the control button to select MODE from the top level menu items and then select the mode required fromthe submenu items.
Note: The availability of the modes depend upon the type of transducer fitted to the gauge.
6.1 PULSE-ECHO MODE (P-E), COATING OFF
The standard measurement mode providing maximum sensitivity. This general purpose mode should be
used for corrosion and flaw inspections and will measure the total thickness of a material.
6.2 PULSE-ECHO COATING MODE (PECT), COATING ON
Special mode that allows measurement of coating thickness and material thickness at the same time while
retaining the capability to detect flaws.
6.3 ECHO-ECHO MODE (E-E), THRUPAINT™
This special mode allows the user to measure the material thickness of a substrate underneath a coating
while ignoring the coating thickness by using two echoes from the material back wall. This mode is usefulwhen the coating thickness makes up a sizeable proportion of a material, but has the impact of reducing
sensitivity so should not be used in pit and flaw inspections.
13

en
6.4 SINGLE ELEMENT TRANSDUCER TRIPLE ECHO MODE (E-E-E)
This mode uses a third echo to double check the measurement, increasing the reliability of a measurement
even further from the E-E mode.

7 SETTING UP THE GAUGE
7.1 AUTOMATIC TRANSDUCER IDENTIFICATION
When you switch on your gauge, it will automatically identify the transducer type connected as described
below:
Note: Your gauge will only work correctly when fitted with Elcometer NDT transducers.
1. Connect the transducer to the gauge - see “Fitting the transducer” on page 5.
2. Ensure all couplant has been removed from the face of the transducer.
3. Switch on the gauge - see “Switching on/off” on page 6.
The settings and memory display will begin scrolling the current gauge settings, one of which is thetransducer type (1/2 2S or 1/2 5)...etc.
4. If the display shows NO PRB, and a dual element probe has been connected to the gauge, either thetransducer is faulty, or it is not an Elcometer NDT transducer supplied for this gauge type. If a single
element membrane transducer has been connected, be sure the dongle is connected to the correct
socket on the end cap of the gauge - “Fitting the transducer” on page 5. Switch off the gauge andrepeat the above steps until the transducer type has been identified.
If the probe is identified, the gauge will now automatically perform a probe zero - see “Transducer Zeroing” on page 15.
14

en
7.2 TRANSDUCER - ZEROING
Setting the zero point for the transducer is important for the same reason that setting the zero on amechanical micrometer is important. If the zero point of the transducer is not set correctly, all of themeasurements the gauge makes will be in error by some fixed number. When the zero point of thetransducer is set, this fixed error value is measured and automatically corrected for in all subsequent
measurements.
The gauge will perform a probe zero whenever it is switched on. You should also perform a probe zero
whenever you change the transducer and at other times on a regular basis. The zero probe routine must be
done prior to calibration. This will ensure that the zero point of the instrument is always correct.
When a dual element transducer is connected to the gauge:• If the selected mode is either pulse-echo (P-E) or pulse-echo coating (PECT), a probe zero will automatically be done following startup.
• If the selected mode is echo-echo, you must first change mode to either pulse-echo (P-E) or pulseecho coating (PECT), before performing a probe zero.
Note: Multi-echo modes do not require a probe zero.
Your gauge has two methods of conducting a probe zero:
Automatic probe zero (off block): When this function is selected the gauge conducts an electronic zeroautomatically, eliminating the need for a zero disk or block
Manual probe zero (on block): When this function is selected the transducer must be placed on the probe
zero disk located on the bottom end cap.

15

en
7.2.1 To conduct an automatic probe zero (off block)
1. Remove all couplant from the face of the transducer and check that the wearface of the transducer isclean and free of any debris.
2. Use the control button to select ZERO from the top level menu items and then AUTO from the submenu items.
The gauge performs the automatic zero and is then ready to be calibrated for a given material type.
7.2.2 To conduct a manual probe zero (on block)
1. Remove all couplant from the face of the transducer and check thatthe wearface of the transducer is clean and free of any debris.
Zero Disk
0$18$/

2. Use the control button to select ZERO from the top level menu
items.
The zero submenu items begin scrolling.
3. Apply a drop of couplant on the transducer and place the transducer in steady contact with the zero disk (located on the bottom
end cap), and obtain a steady reading.
Note: Do not remove the transducer from the zero disk.
The display should show a thickness value, and nearly all the barsof 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 thesesteps to ensure reliability of the zero calculation.

16

en
4. Use the control button to select MANUAL from the submenu items.
The gauge performs the manual zero.
5. Remove the transducer from the zero disk.
The gauge is now ready to be calibrated for a given material type.
7.3 TRANSDUCER - ZEROING FOR COATING MEASUREMENTS
In order to account for very slight electronic differences in transducers of the same type, frequency, anddiameter, your gauge has a "zero coating" feature. This enables your gauge to obtain very accurate
readings on coatings, eliminating potential errors incurred from slight differences in the manufacturing
processes.
The coating zero should be performed on the zero disk or an uncoated section of the material being tested.
Note: For this procedure, a coating transducer must be fitted to the gauge.

17

en
1. Remove all couplant from the face of the transducer and checkthat the wearface of the transducer is clean and free of any
debris.

Zero Disk

0$18$/

2. Use the control button to select ZERO from the top level menu
items.
The zero submenu items begin scrolling.
3. Apply a drop of couplant on the transducer and place the transducer in steady contact with the zero disk (located on the bottom
end cap), and obtain a steady reading.
Note: Do not remove the transducer from the zero disk.
The measurement display should show a thickness value, andnearly all the bars of the stability indicator should be illuminated.
Note: The value that is displayed will change depending on thecurrent 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. Use the control button to select COAT from the submenu items.
The gauge performs the coating zero.
5. Remove the transducer from the zero disk.

7.4 CALIBRATING
In order for the gauge to make accurate measurements, it must be calibrated to the sound-velocity of thematerial being measured.
18

en
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.
To calibrate your gauge for the material you are measuring, you select the material from a list of materials
stored in the gauge. For each material stored in the list there is a corresponding sound-velocity value. Thereare eight factory-set materials which you cannot change, plus one user customisable sound-velocity value:
Submenu
Item

Material

Sound-velocity
m/s

in/µs

ALU
STL
STST
IRON
CIRO
PVC
PLST
PLUR

Aluminium

6350

0.2500

Steel 4340

5918

0.2330

Stainless Steel 304

5662

0.2229Iron

5893

0.2320CUSTOM
19

Cast Iron

4572

0.1800PVC

2388

0.0940

Polystyrene

2337

0.0920

Polyurethane

1778

0.0700User-defined sound-velocity

-

-

en
7.4.1 Selecting a Material and Sound-velocity
Use the control button to select MTL from the top level menu items and then select the material required
from the submenu items.
The gauge is now calibrated for the material selected and ready to take readings.
7.4.2 Editing the User Customisable Sound-velocity Value
To calibrate your gauge for the material and coating you are measuring, use ElcoMaster™ to define thesound-velocity for the material and for the coating and to upload these values into the gauge - see theinstructions included with ElcoMaster™ and “Data Transfer Software” on page 31.

8 MEASUREMENT - TAKING READINGS
Disclaimer: Inherent in ultrasonic thickness measurement is the possibility that the instrument will use thesecond rather than the first echo from the back surface of the material being measured. This may result ina thickness reading that is TWICE what it should be.
Responsibility for proper use of the instrument and recognition of this phenomenon rests solely with the userof the instrument.
Other errors may occur from measuring coated materials where the coating is insufficiently bonded to thematerial surface. Irregular and inaccurate readings may result. Again, the user is responsible for proper use
and interpretation of the measurements acquired.

20

en
8.1 BEFORE YOU START• Prepare the surface - see “Condition and Preparation of Surfaces” on page 39.
• Set the zero point of the transducer - see “Setting up the Gauge” on page 14.
• Select units - see “Units” on page 24
8.2 PROCEDURE
1. Apply couplant
For the gauge to work correctly there must be no air gap between the transducer and the surface ofthe material to be measured. This is achieved using a couplant. When the gauge is used underwater
as intended, the water itself acts as a couplant. However when the gauge is used above water, a couplant will be required.
Before the transducer is placed on the surface, put a small amount of couplant on the surface of thematerial. Typically a single drop is sufficient.
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 thewearface seated flat against the surface of the material.
3. Read the measurement display
If six or seven bars of the stability indicator on the measurement display are showing, the display will
be reading the correct thickness of the material directly beneath the transducer.
If the stability indicator has fewer than five bars showing, or the numbers on the display seem erratic,
check to make sure that there is an adequate film of couplant beneath the transducer, and that thetransducer is seated flat against the material.

21

en
The gauge will perform a number of measurements every second when the transducer is in contact
with the surface of the material. The measurement display is updated as each reading is taken.
4. Remove transducer from surface
The measurement display will show the last measurement made.
Note: Occasionally, a small film of couplant will be drawn out between the transducer and the surface as
the transducer is removed. When this happens, the gauge may perform a measurement through thiscouplant film, resulting in a measurement that is larger or smaller than it should be. This phenomenon canbe seen when one thickness value is observed while the transducer is in place, and another value isobserved after the transducer is removed. If this happens, take the reading again using less couplant.

9 THRUPAINT™ MEASUREMENT TECHNIQUE
Your gauge is equipped with a ThruPaint™ measurement mode that uses a multiple echo technique toallow measurement of the material thickness beneath a coating. This is useful for checking the material
thickness of painted object.
ThruPaint™ capability is available in E-E mode, to activate ThruPaint™ operation select this measurementmode using the MULTI MODE key.
Special "High Damped" or Coating Thickness transducers are required for this mode to function.
Further information may be found on the Elcometer NDT Knowledge Centre on www.elcometerNDT.com

22

en

10 MEASUREMENT OPTIONS
10.1 GAIN
The gain (the amplitude of the transmitted pulse) can be adjusted to suit a variety of applications. To obtainvalid readings the gain must be set to the correct level to give reliable return echoes:• Too much gain may result in erroneous measurements by detecting noise rather than the material
back wall itself.
• Not enough gain may result in intermittent detection. It may also result in lack of detection on internal
flaws, pits, or porosity.
The gain setting on your gauge can be compared to the volume control of a home stereo system. If you turnit up too much you cannot hear the music clearly. If it is turned down too much, you cannot hear it at all.
Note: GAIN will only be displayed as a top level menu item if a dual element style transducer has beenconnected, and the gauge is in either pulse-echo mode (P-E) or pulse-echo coating mode (PECT). Multiple
echo modes, which include both single and dual style probes, are equipped with automatic gain control that
optimises the gain setting automatically and in these modes, GAIN is disabled and not displayed.
Your gauge has been optimised for a medium gain setting and for the majority of applications it can be usedat this setting. Some applications however may require lower or higher gain settings:• Lower values might be necessary for noisy or granular cast materials. If the reading becomes sporadic and will not settle down or resolve on a thickness value.
• Higher values may be necessary when trying to measure a material that is hard to penetrate (due tothe material type, or the overall thickness of the material) and when locating fine pits or flaws. In these
instances, increase the gain to see if the reading settles down and becomes stable.

23

en
To select a gain setting:
Use the control button to select GAIN from the top level menu items and then select the gain setting
required from the submenu items:
•
•
•
•
•

VLOW
LOW
MED
HIGH
VHIGH

10.2 UNITS
The measurement readings can be displayed in metric units (mm) or English units (inches):
Use the control button to select UNITS from the top level menu items and then select the units setting fromthe submenu items:
•
•

IN
MM

10.3 DISPLAY BACKLIGHTS AND LEDSYour gauge has three lighting options. Choose the option which best meets your requirements for visibility
versus power consumption:24

en
Use the control button to select UG20DL from the top level menu items and then select the required option
from the submenu items:•••

LT ON - Select to switch on all the LEDs and display backlights.
LT OFF - Select to switch off all the LEDs and display backlights.
LT AUTO - Select to switch on all the LEDs and display backlights when the gauge takes ameasurement.

11 MEASUREMENT - RECORDING YOUR READINGSYour gauge is equipped with a data logger - an essential feature for improving the efficiency of productinspection. With a data file open, all your readings values are saved into the file, therefore eliminating theneed to manually record measurements during the inspection process. Once all the measurements havebeen taken, the gauge can then be connected to a computer or serial printer to save and print the resultsof the inspection.
11.1 ABOUT THE DATA LOGGER
With a data file open, as you take measurements, the measurement data is stored in files in the gauge
memory.
Data logger file format: You have a choice of two different file formats:

25

en
•

Grid format: Similar to a spreadsheet format in which each cell is used to store
a reading. Cells are referenced by the row number (1 to 999) and the column
label (A to ZZ).

Grid format•

Sequential format: A single column of up to 512 possible rows (readings), anda column of corresponding identifiers associated with each individual reading.
The identifier can be a combination of up to 10 alphanumeric/special characters (see below), however it must not start or end with a special character.
Once a start and end ID are entered into the gauge and the log created, thegauge automatically generates all the identifiers within that range.

Sequential format

Data logger filename character sets: Any combination of the following characters can be used for filenames and sequential format identifiers:• Numeric characters: 0 - 9• Alpha Characters: A - Z• Special Characters: ! ' _ # space / . - ( )What measurement data is saved: When a measurement is taken (irrespective of log file format), thefollowing information is saved:• The reading value.
• A screenshot of the echo waveform plus all the gauge settings. This ‘Save Graphics’ option can be
toggled on/off.
26

enMemory capacity: You can create and save as many data files as required up to the maximum capacity of
the gauge memory (32 Mbit). If you try to create a new file which exceeds the memory capacity, the gauge
will display an error message. In this instance, to free some space in memory, you should consider deletingsome of the existing files or transferring them to a computer
Note: Multiple grids can be created and saved as template files on a PC, using ElcoMaster™ software, but
only one grid can be uploaded into the gauge at a time.
Save Graphics Option

Memory Capacity(readings)

On

16 000 +Off

210 000 +11.2 CREATING A DATA LOGGER FILE
You define the parameters of a data logger file using ElcoMaster™ software. Once the file has been definedand saved, you then transfer the file to the gauge using the supplied PC connection cable. For full
instructions on how to define the parameters of a data logger file and save it, see the help included with
ElcoMaster™. The following sections describe the data logger file parameters which must be defined:
11.2.1 Coordinates/Identifiers
Grid files: A grid is defined by using coordinates to define the Top Left and the Bottom Right corners of thegrid. Alpha coordinates are horizontal across the top, and numeric coordinates are vertical down the side similar to the coordinates of a cell in a spreadsheet.
The boundaries of the grid are set by defining the coordinates for the top left cell and the lower right cell.
27

enSequential files: A sequential file is a single column of up to 512 possible rows (readings), and a columnof corresponding identifiers associated with each individual reading.
The boundaries of the column are set by defining a start ID and an end ID (the gauge will automaticallygenerate all the identifiers within this range).
With both file formats (Grid/Sequential), if you attempt to create a file that is larger than the statedboundaries, an error message OUT OF MEMORY is displayed.
11.2.2 Auto Increment Direction
The Auto Increment function allows you to specify which direction to advance the cursor after storing areading.
11.2.3 Save Graphics Option
When you create a data logger file you have the option of specifying whether a screenshot of the echo
waveform plus all the gauge settings is saved with each reading value. Saving the waveform and settingsfor each reading may be of benefit for reporting purposes, and gives additional confidence in themeasurements, as the waveform can be studied to review and confirm the validity of the measurement
values.
11.3 ENABLING THE DATA LOGGER
1. Switch on the gauge - see “Switching on/off” on page 6.
•

If the display shows a storage location in the left most top level menu item (i.e. A1), the data logger
is already enabled and ready to store readings.

•

If the display shows MEMOFF in the left most top level menu item, the data logger is disabled andmust be enabled.
28

en
2. To enable the data logger, select UG20DL and then select MEM ON from the submenu items.
When the data logger is enabled, the current storage location is displayed in the left most top levelmenu item (i.e. A1).
11.4 MOVING STORAGE LOCATION WITHIN A DATA FILE
When you define a data file using ElcoMaster™ software one of the selection options is Increment Direction.
The increment directions are those of a compass; NORTH, SOUTH, EAST, WEST and NONE.
• When the increment direction is set to NORTH, SOUTH, EAST, or WEST, the gauge will automaticallymove to the next storage location in the defined direction.
• When the increment direction is set using ElcoMaster™ to NONE, you have to manually set the increment direction in the gauge.
When a data file is open, you can navigate your way through the file using these increment directions (forinstance, to save a reading in an alternative location, or just to review measurements):
Use the control button to select DIRECT from the top level menu items and then select the direction
required from the submenu items:
•
•
•
•

NORTH
SOUTH
EAST
WEST

Note: If you want to step quickly through storage locations in a single direction, follow the steps above, andthen continuously press and release the control button to move in the direction chosen.
29en11.5 SAVING READINGS IN A DATA FILE
To save readings in a data file:
1. Create a data file and transfer it to the gauge using ElcoMaster™ - see “Creating a Data Logger File”
on page 27.
2. Ensure the data logger file is enabled - see “Enabling the data logger” on page 28.
3. Take a reading - see “Measurement - Taking Readings” on page 20.
4. Press and release the control button.
The measurement value and data is saved to the current storage location of the data file.
The storage location is then advanced automatically in the direction defined.
Note: The storage location must be empty. If the storage location already contains measurement data, thegauge will not take a measurement. Either clear the storage location, or move to an empty location.
11.6 CLEARING A STORAGE LOCATION
To delete measurement data from a storage location:
1. Move to the storage location you want to clear - see “Moving Storage Location within a data file” onpage 29.
2. Use the control button to select CLEAR from the top level menu items.

CLEAR and then the storage location (i.e. A1) are shown alternating on the display.
3. Press and release the control button.
The storage location is cleared.

30

en

12 DATA TRANSFER SOFTWARE
Software is available which allows data and settings to be transferred between your gauge and a PC.
Presently Elcometer supplies ElcoMaster™ software for this purpose.
To set-up other types of communications software:
1. Start the communications software.
2. Configure the software using the following parameters:
Data Bits - 8, Parity - None, Stop Bits - 1, Baud Rate 1200 (to print a report), or 9600 to transfer
data file.
Note: A report can be printed to a communications program (i.e. HyperTerminal), or printed to a serial
printer using A4 or 8.5" x 11" paper.
3. Set the communications software COM port to the port number that the gauge is connected to.
12.1 TRANSFERRING DATA AND SETTINGS
12.1.1 Data port
The data port socket (LEMO type) is located behind the bottom end cap of the gauge. It
is designed to connect directly from the gauge to a standard AT serial port on a PC. The
cable supplied with the gauge is a LEMO to 9 pin serial cable.

Data port
socket31

en
12.1.2 Computer System Requirements
ElcoMaster™ requires Windows XP or better to run correctly. ElcoMaster™ is not currently compatible withMac OS.
ElcoMaster™ requires an available communications port in order to transfer data to and from the gauge.
12.1.3 USB to Serial Converter
Some newer laptop computers do not have standard serial ports. In this case it is possible to use a USB to
Serial converter. If a serial to USB cable is needed, contact Elcometer (part number: TL-24032).
12.1.4 Installing ElcoMaster™
Installing ElcoMaster™ comes on a CD-ROM with an automatic installer program. Alternatively, thesoftware may be downloaded from www.elcometerNDT.com

13 STORAGE
Your gauge has a Liquid Crystal Display. If the display is heated above 50°C (120°F) it may bedamaged. This can happen if the gauge is left in a car parked in strong sunlight.
Always store the gauge in its case when it is not being used.
If the gauge is to remain unused for long periods of time, remove the batteries and store themseparately. This will prevent damage to the gauge in the event of malfunction of the batteries.

32

en

14 MAINTENANCE
You own one of the finest underwater thickness gauges in the world. If looked after, it will last a lifetime.
14.1 FAULTSYour gauge is designed to give many years reliable service under normal operating and storage conditions.
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.
14.2 TRANSDUCER
The transducer will wear with repeated use. Transducer life depends on the number of measurements taken
and the manner in which readings are taken. To extend transducer life, always set the transducer down sothat it is perpendicular to the panel surface. Dragging the transducer along the surface will reduce the lifeof the transducer. Replacement transducers are available from your local Elcometer NDT supplier or directlyfrom Elcometer NDT.

33

en

15 TECHNICAL SPECIFICATION
Measuring Rangea

Pulse-Echo P-E

0.63 mm to 500 mm (0.025” to 19.999”)

Pulse-Echo Coating PECT

Material: 0.63 mm to 500 mm (0.025” to 19.999”)
Coating: 0.01 mm to 2.54 mm (0.001” to 0.100”)

Echo-Echo E-E

2.54 mm to 102 mm (0.100” to 4.0”)
Range will vary +/- depending on the coating.

Triple Echo E-E-E

1 mm to 150 mm (0.040” to 6.0”) in steel
Range will vary +/- depending on the coating.

Measurement Rate (Manual)

4 readings per second

Measurement Resolution

0.01 mm (0.001")

Velocity Calibration Range

1250 m/s to 13995 m/s (0.0492 in/µsto 0.5510 in/µs)

Velocity

1 user-programmable velocity (for material and coating)
8 pre-calibrated velocities (aluminium, cast iron, iron, polystyrene, polyurethane, PVC, stainless steel and steel)

Weight (including batteries)

680 g (1.5 lbs)

Dimensions (Length x Dia.)

229 mm x 60.33 mm (9.0” x 2.375”)

Gauge Operating Temperature-29°C to 60°C (-20°F to 140°F)

Case

High strength transparent plastic housing with gasket sealed
end caps and magnetically coupled operating button.
Depth rating of 300 m (1000 ft).
34

en
PC Connection

RS232 serial port. Windows PC interface software

Display

12.7 mm (1/2”) 4.5 Digit LCD (Measurement Display)
9.5 mm (3/8”) 6 Character LCD (Settings and Memory Display)
Both displays have LED backlight (on/off/auto).

Power Source

Three 1.5 V alkaline or 1.2 V NiCad AA cells.
With LED backlight off, typically operates for 50 hours on
alkaline and 15 hours on NiCad (charger not included.)
Note: Alkaline batteries must be disposed of carefully to avoid
environmental contamination. Please consult your local
environmental authority for information on disposal in yourregion. Do not dispose of any batteries in fire.

a. Measuring Range depends on material, surface conditions and the transducer selected.

35

en

16 WARRANTY
Elcometer NDT warrants your gauge against defects in materials and workmanship for a period of two years
from receipt by the end user.
Additionally, Elcometer NDT warrants transducers and accessories against such defects for a period of 90days 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.
16.1 EXCLUSIONS
The above warranty shall not apply to defects resulting from: improper or inadequate maintenance by thecustomer; unauthorised modification or misuse; or operation outside the environmental specifications forthe product.
Elcometer NDT makes no other warranty, either express or implied, with respect to this product.
Elcometer NDT specifically disclaims any implied warranties of merchantability or fitness for a particularpurpose. Some states or provinces do not allow limitations on the duration of an implied warranty, so theabove limitation or exclusion may not apply to you. However, any implied warranty of merchantability or
fitness is limited to the two-year duration of this written warranty.
This warranty gives you specific legal rights, and you may also have other rights, which may vary fromcountry to country, state to state or province to province.
This warranty is void in the event of negligent handling of the housing including, but not limited to, dropping
the housing, modifications to the housing by other than the manufacturer, improper care of the sealing
components, and exceeding the specified depth limitation of 300 m (1000 ft).

36

en
16.2 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:• Repair the product• Replace the product with a re-manufactured unit
• Replace the product with a product of equal or greater performance• Refund the purchase price.
16.3 AFTER THE WARRANTY PERIOD
If your hardware should fail after the warranty period, contact Elcometer NDT for details of the services
available, and to arrange for non-warranty service.

17 SPARES & ACCESSORIES
17.1 TRANSDUCERS
Elcometer NDT gauges are not supplied with a transducer as standard - this must be ordered separately.
The transducers listed below are the most commonly used however, Elcometer NDT offer a wide range ofother transducers to suit various applications.
Further information on the transducers available and their applications can be found on the Elcometer NDT
Knowledge Centre on www.elcometerNDT.com

37

en
Description
3.5 MHz 1/2” Potted Top Dual Element Underwater Transducer
5.0 MHz 1/2” Potted Top Dual Element Underwater Transducer
2.25 MHz 1/2” Lemo Single Element Membrane Underwater Transducer
5.00 MHz 1/2” Lemo Single Element Membrane Underwater Transducer
Underwater Gasket Lubricant, 6 g
O-Ring Kit (1 lubricant, 2 gaskets)
10 MHz 1/4” Potted Side Transducer

Sales Part No.
TX3M50EP-3
TX5M00EP-8
TX2M25EL-2
TX5M00EL-2
TC-24034-6
TZ-24037
TX10M0CP-4

17.2 CALIBRATION BLOCKS
Elcometer NDT offer a comprehensive range of calibration blocks to suit a wide range of applications andstandards.
Selecting the correct calibration block for the application is essential to ensure accurate evaluation. The
form, shape and material of the calibration block should be appropriate for the material being inspected. Any
artificially induced flaw should closely resemble that of the actual flaw being tested for.
The calibration blocks listed below are a selection of those available - details of the full range can be foundon www.elcometerNDT.com.
Description
Sales Part No.
Calibration Block: 8 Step; 1 - 8mm
TW-24005-*
Calibration Block: 10 Step; 2 - 20mm
TW-24006-*
Calibration Block: 10 Step; 2.5 - 25mm
TW-24007-*
Replace * with S1018 = 1018 Steel Block; A = Aluminium Block; SS = Stainless Steel Block;
T = Titanium Block.

38

en
17.3 ULTRASONIC COUPLANT
Each gauge is supplied with a 120ml (4oz) bottle of standard ultrasonic couplant. Replacement bottles areavailable from your local Elcometer NDT supplier or directly from Elcometer NDT.
Description
Sales Part No.
Ultrasonic Couplant, 120 ml (4 oz)
TC-24034-1
Ultrasonic Couplant, 360 ml (12 oz)
TC-24034-2
Note: A wide range of other transducers and accessories is available - see www.elcometerNDT.com fordetails.
17.4 MISCELLANEOUS
Description

Sales Part No.

RS232 Cable USB to Serial Converter

TL-24031

18 TRANSDUCERS
Further information can be found on the Elcometer Knowledge Centre on www.elcometerNDT.com

19 CONDITION AND PREPARATION OF SURFACES
Further information can be found on the Elcometer Knowledge Centre on www.elcometerNDT.com

20 APPLICATION NOTES
Further information can be found on the Elcometer Knowledge Centre on www.elcometerNDT.com

39

en

21 SOUND VELOCITIES OF COMMON MATERIALS
Material
Aluminium
BismuthBrass
Cadmium
Cast Iron
Constantan
CopperEpoxy Resin
German Silver
Glass, Crown
Glass, Flint
Gold
Ice
Iron
Lead
Magnesium
Mercury
NickelNylon

Sound-velocity(m/s)(in/µs)

6350
2184
4394
2769
4572
5232
4674
2540
4750
5664
4267
3251
3988
5893
2159
5791
1448
5639
2591

0.250
0.086
0.173
0.109
0.180 (Approx.)
0.206
0.184
0.100 (Approx.)
0.187
0.223
0.168
0.128
0.157
0.232
0.085
0.228
0.057
0.222
0.102 (Approx.)

Material
Paraffin
Platinum
Plexiglas
Polystyrene
Porcelain
PVC
Quartz Glass
Rubber, Vulcanised
SilverSteel
Steel, StainlessStellite
TeflonTin
Titanium
Tungsten
Water
Zinc

Sound-velocity(m/s)(in/µs)

2210
3962
2692
2337
5842
2388
5639
2311
3607
5918
5664
6985
1422
3327
6096
5334
1473
4216

0.087
0.156
0.106
0.092
0.230 (Approx.)
0.094
0.222
0.091
0.142
0.233
0.223
0.275 (Approx.)
0.056
0.131
0.240
0.210
0.058
0.166

40

en

22 THE MENU COMMANDS
Note: The availability of these commands depends upon the transducer type and gauge settings.
Top Level
Menu Item

Submenu
Item

STORE

A 1

Description
Displays the current measurement reading storage location. This location
can refer to either a grid cell location (similar to a cell in a spreadsheet), ora sequential format location, depending on which file format was uploaded
into the gauge.
Note: A grid file structure is loaded into the gauge prior to despatch from the
Elcometer NDT factory.
If MEMOFF is selected, the STORE top level menu item is replaced by

MEMOFF.
DIRECT

41

NORTH
SOUTH
EAST
WEST

Part of the data logger. The submenu item selected specifies in which
direction to advance the cursor after a measurement is stored. If a twodimensional grid format is being used, all direction options can be used,however if a sequential file format is used, only NORTH and SOUTH are
applicable.
If MEMOFF is selected, DIRECT is disabled and not displayed.

en
Top Level
Menu Item

Submenu
Item

CLEAR

LOC

Description
Part of the data logger. If a measurement is stored by mistake, or in thewrong location, the measurement can be cleared from memory using thisoption. Use DIRECT to advance to the location, then select CLEAR toerase the stored measurement.
If MEMOFF is selected, CLEAR is disabled and not displayed.

42

en
Top Level
Menu Item

Submenu
Item

ZERO

AUTO

Initiates an off-block electronic zero automatically, eliminating the need fora manual zero on a specified disk or block. When the gauge is switched on,
it performs an auto zero during the boot sequence. However, another auto
zero may be needed to account for changes in temperature, or an incorrect
zero due to couplant on the end of the transducer during the zeroingprocess.

MANUAL

Initiates an on-block manual zero. This zero is used to reset the internal zerofor of the gauge, as a reference point for the auto zero.

Description

Note: The reference disk is located on the bottom end cap.

COATING

In order to account for very slight electronic differences in transducers of thesame type, frequency, and diameter, your gauge has a zero coating feature.
This enables your gauge to obtain very accurate readings on coatings,
eliminating potential errors incurred from slight differences in the
manufacturing processes. This zero is only used when the PECT coating
mode feature is being used. Although the coating thickness is not displayedon the display, the coating thickness is stored with the base material
thickness when a measurement is saved to memory.
Once the data is downloaded to a PC, the coating thickness will be
displayed with the PECT measurement stored.

43

en
Top Level
Menu Item

Submenu
Item

GAIN

VLOW
LOW
MED
HIGH
VHIGH

Description
Select to eliminate unwanted noise or for maximum resolution.
Select to reduce unwanted noise or for better resolution.
The standard setting.
Select for better penetration.
Select for maximum penetration.

44

en
Top Level
Menu Item

Submenu
Item

MATL

ALU
STL
STST
IRON
CIRO
PVC
PLST
PLUR
CUSTOM

Description
Aluminium: 6350 m/s (0.2500 in/µs)
Steel: 5918 m/s (0.2330 in/µs)
Stainless Steel:
Iron:
Cast Iron:
PVC:
Polystyrene:
Polyurethane:
Custom material. The common material types listed above each have astandard factory-set sound-velocity. Materials of the same type, can havevarying grades and consistencies and as a result, the material soundvelocity will also have slight variations. CUSTOM is included to allow you to
add your own sound-velocity, and can be programmed via ElcoMaster™
PC software45

enTop Level
Menu Item

Submenu
Item

UNITS

IN
MM
P-E
PECT

Select for measurements in inches.

E-E

Select to measure coated materials. Measures the base material only
without having to remove the coating.

E-E-E

Special multiple echo mode used only with Elcometer NDT single element
membrane transducers.

LT ON
LT OFFLT AUTO

Select to switch on all the LEDs and display backlights.

MEMOFF

Select to disable data logging. When selected, this submenu item moves tothe start of the top level menus.

MODE

UG20DL

Description

Select for measurements in millimetres.
Select to measure non-coated material (bare metals).
Select to measure coated materials. Measures the thickness of both thebase material and coating.

Select to switch off all the LEDs and display backlights.
Select to switch on all the LEDs and display backlights when the gauge
takes a measurement.

46