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Cygnus 2
Accessories List
Doc No. M41-CYG2-M-01_Iss3.doc
(Mk4 Cygnus 2 Gauges with OLED Display)
Cygnus 2 Operating & Accessories Manual M41-CYG2-M-01_Iss3.doc
QUALITY POLICY STATEMENT
Cygnus Instruments is committed to being a premier supplier of
niche test and measurement instruments. Cygnus is dedicated
to customer satisfaction. Cygnus will always provide products
and service of exceptionally high quality. We will listen to our
customers and be both market-led and technology driven. And
by utilising a formal Operations Management System that
complies with industry standards, we will continually improve
what we do and how we do it.
Cygnus is an ISO-9001 accredited company.
The scope of our accreditation covers all our products and
M41-CYG2-M-01_Iss3.doc Cygnus 2 Operating & Accessories Manual
1. Introduction...................................................................... 5
Cygnus 2 Thickness Gauge. ..................................................... 5
Multiple Echo Measurements. ................................................... 6
Triple Echo Verification. ........................................................ 6
Cygnus Instruments. .............................................................. 7
Gauge Kit Contents ................................................................. 8
2. Gauge Preparation ............................................................ 9
Fitting the Batteries ................................................................ 9
Connecting the Probe ............................................................ 10
Fitting the Protective Sleeve .................................................. 11
Fitting onto a Belt Strap ..................................................... 12
Fitting the Neck Strap ........................................................ 12
3. Gauge Operation ............................................................. 13
Gauge Controls .................................................................... 13
Turning the Gauge On........................................................... 14
Turning the Gauge Off .......................................................... 14
Automatic Power Off .......................................................... 14
Taking a Thickness Measurement ........................................... 15
Echo-Strength Indicators ....................................................... 15
Battery Life ......................................................................... 16
Battery Level ....................................................................... 16
Low Battery Warning ............................................................ 17
4. Probes & Membranes ...................................................... 18
Probe Selection .................................................................... 18
Changing the Membrane ....................................................... 19
Probe Selection & Specifications ............................................. 20
Probe Frequency Identification ............................................... 20
5. Gauge Setup ................................................................... 21
Gauge Menu Diagram ........................................................... 21
Calibrating the Gauge ........................................................... 22
Calibrating to a known thickness (Single Point) ...................... 23
Setting the Velocity of Sound .............................................. 24
Measurement Units............................................................... 25
Resolution Setting ................................................................ 25
Valid Thickness Measurement Beep......................................... 26
Display Brightness Setting ..................................................... 26
Automatic Probe Frequency Setting. ....................................... 27
6. General Points On Thickness Gauging ............................. 28
7. Troubleshooting .............................................................. 29
The Gauge will not Switch On ................................................ 29
Difficulty obtaining a Reading................................................. 29
If Readings are Erratic or Unstable ......................................... 29
8. The 4 Point Check ........................................................... 30
9. Care and Servicing .......................................................... 31
Cleaning the Gauge .............................................................. 31
Batteries ............................................................................. 31
Environmental ..................................................................... 31
Repairs ............................................................................... 31
Returning the Gauge for Servicing .......................................... 32
10. Information ................................................................. 33
Technical Specifications......................................................... 33
Table of Sound Velocities ...................................................... 35
Reading Conversions .......................................................... 36
11. Accessories List. .......................................................... 37
Remote Probes with 1.35 m (46) lead. .................................. 37
Marinised Probes with Cable length to order. ............................ 38
Probe Spares and Membranes ................................................ 39
Cables and Leads ................................................................. 40
Electronic Bodies Only........................................................... 40
Miscellaneous Spares ............................................................ 40
Carry Cases ......................................................................... 40
12. EU Declaration of Conformity ....................................... 41
13. Recycling and Disposal (EC Countries)......................... 42
14. Index ........................................................................... 43
Cygnus 2 Thickness Gauge.
The Cygnus 2 Multiple-Echo Ultrasonic Thickness Gauge is a
rugged, handheld, battery-powered instrument designed for high-
reliability thickness measurement using the multiple-echo
The Gauge can be used with a choice of single-crystal Ultrasonic
Probes, depending on the thickness and type of material which is
to be measured.
Measurements can be displayed in Metric (mm) or in Imperial
(inch) units and measurement resolution can be selected for either
0.1 or 0.05 mm, (0.005 inch or 0.002 inch). The Gauge has an
endmounted low power OLED (Organic LED) graphic display
which can be easily read in most light situations.
Crystal-controlled Calibration provides stability and accuracy. The
gauge can easily be calibrated to a known thickness or to a known
Velocity of Sound. Velocity of Sound is displayed in either m/s or
in/s, depending on the current selection for Measurement Units
The Gauge is able to operate accurately in a wide range of ambient
temperatures and is environmentally sealed to IP65 & IP67 for use
in wet conditions.
The Gauge is a solid-state electronic instrument which, under
normal operating conditions, will give many years of active
Although designed for ease of operation the first time user
should carefully read this manual to familiarise themselves
with the features of the Gauge.
Multiple Echo Measurements.
The Gauge works on the pulse-echo principle. The Probe transmits
a very short pulse of ultrasound which enters the test piece. The
Probe then acts as a receiver listening for return echoes,
converting them into electrical signals which are processed to
produce timing information that can be used to determine the
material thickness.
Valid Thickness Measurement only when : t2=t3
t1 t2 t3
e1 e2 e3
Paint, Dirt etc
0 Time
The multiple-echo beam travel is depicted above, spread out in
time, to illustrate the timing method. In reality the beam path is
straight and perpendicular to the surface as the ultrasonic energy
reverberates up and down within the metal (shown on the left).
Each time an echo is reflected back down, a small portion of the
energy comes up through the coatings and is detected by the
Probe which acts as a receiver (e1, e2 and e3).
The delay between echoes at the Probe-face (t2 and t3) is exactly
equal to the time taken to pass through the metal twice, therefore
coatings such as paint are ignored and the measurement displayed
is the metal thickness only.
Triple Echo Verification.
The Gauge requires 3 equi-spaced return echoes in order to
calculate a thickness measurement value (t2=t3). This method
ensures the Gauge only displays valid thickness values, the three
echoes provide a reliable method of signal verification. This
process is referred to as Triple Echo Verification.
Cygnus Instruments.
Cygnus Instruments Limited, founded in 1983, were pioneers in
the development of the Digital Ultrasonic Multiple-Echo Technique
used for measurement through coatings. This has long been the
standard required to ensure that accurate measurements are
taken without the need to first zero the Gauge or remove any
coatings.
Our philosophy is to work closely with each of our customers to
provide a range of products specifically for each application.
Cygnus Ultrasonic Thickness Gauges are designed to be simple to
use and to withstand the harsh environments that they are
intended for. We have built up an enviable reputation with our
customers in over 45 countries around the world.
Cygnus House, 30 Prince of Wales Road,
Dorchester, Dorset DT1 1PW England.
Tel: +44 (0) 1305 265533 Fax: +44 (0) 1305 269960
www.cygnus-instruments.com sales@cygnus-instruments.com
CYGNUS Instruments Inc. CYGNUS Singapore (S) Pte. Ltd.
63 Jalan Pemimpin #05-01,
1993 Moreland Parkway, Suite 202.
Pemimpin Industrial Building.
Annapolis, Maryland 21401, USA.
577219 Singapore.
Tel: +1 410 267 9771 Tel : +65 6252 5909
Fax: +1 410 268 2013 Fax : +65 6251 1318
www.cygnusinstruments.com www.cygnus-instruments.sg
sales@cygnusinstruments.com sales@cygnus-instruments.sg
Gauge Kit Contents
1. Cygnus 2 Gauge
2. Protective Silicone Sleeve
3. Cygnus 2 Operating & Accessories Manual
4. Blue High-Flex Probe Cable, 1.5 m *
5. Accessory Pouch, containing Couplant Gel, Spare Membranes,
Membrane Couplant, Membrane Locking Ring Key, 15 mm
Test block, 2 x AA Procell Batteries and Krusell Belt Clip
6. Adjustable Neck Strap *
7. Probe(s)
* The adjustable neck strap and probe cable will be stored in
either the inside or outside pockets.
2. Gauge Preparation
The Gauge is supplied ready to use, out of the box. Just insert the
batteries, connect the probe to the Gauge, turn on the power and
you are ready to take thickness measurements.
Fitting the Batteries
The Gauge requires 2 x AA/LR6/UM3 Batteries. Cygnus supplies
and recommends Duracell Procell Alkaline batteries.
The batteries are located behind a cover at the bottom of the
Gauge. Unscrew this cover to replace the batteries. The batteries
are inserted + or pip first.
When refitting the battery cover screw ensure it is done up
tight by hand only. A drop of membrane-oil on the threads
will help to ensure smooth operation.
The Gauge is protected against electrical damage from incorrect
battery insertion.
2 x AA Battery
The Gauge can be fitted with NiCad or NiMH rechargeable
batteries but this may reduce the specified operating time.
Connecting the Probe
The Probe is connected to the Gauge with the supplied Probe Cable
as shown below.
The Lemo 1 connector is removed by pulling back on its body. Do
not pull on the cable.
Lemo 1
Fitting the Protective Sleeve
The Gauge is supplied with a protective Silicone Sleeve that fits
over the Gauge. This sleeve is designed to protect the Gauge
against bumps, scratches and dirt while in use whilst still allowing
Gauge operation and battery replacement.
To insert the Gauge simply push the Gauge down into the sleeve,
a lip at the top of the sleeve will retain the Gauge once fully
inserted.
Silicone Sleeve
The Gauge is removed by pushing it out from the bottom.
The sleeve also allows the Gauge to be worn on a belt or
suspended from the Neck Strap included in the kit.
Fitting onto a Belt Strap
The Gauge kit includes a Krusell belt clip
that is attached to the protective silicone
sleeve as shown on the right.
This enables the gauge to be easily taken on
and off the belt clip.
Krusell Belt
Fitting the Neck Strap
The Gauge is supplied with an adjustable Neck Strap. The ends of
the neck strap clip onto rings at the top of the protective silicone
sleeve.
3. Gauge Operation
Gauge Controls
Probe Display
Power ON/OFF Decrease
Button. Value
SET Increase
Gauge Setup Value
Turning the Gauge On
1. Press the Power button
2. A display test pattern appears
3. The firmware & hardware version are
4. The probe frequency is displayed
5. The velocity of sound is displayed
6. The Gauge is ready to use
Turning the Gauge Off
1. Press & Hold the Power button,
2. The display power-off and the Gauge
turns off.
Automatic Power Off
The Gauge will turn off automatically 5 minutes after the last
thickness measurement was taken.
Taking a Thickness Measurement
1. Remove all scale, rust, dirt or loose
coatings and brush the test area clean.
2. Apply couplant to the test surface.
3. Place the probe-face on the clean,
lubricated test surface and make firm
contact applying gentle pressure.
4. The Gauge will display a thickness
measurement, or an indication of Echo
Strength if no valid measurement has
been found.
Echo-Strength Indicators
Should the Gauge be unable to detect a stable multiple echo signal
it displays an Echo Strength indication to help the operator locate
a suitable position.
1. 1 Bar Flashing:
No echoes detected.
2. 1 steady + 1 Bar Flashing:
Only 1 echo detected.
Only 2 echoes detected.
3 echoes detected but they are not
related.
To help obtain a multiple echo reading the operator should
continue to move the probe around to locate a suitable reflector,
using a slight rocking motion.
The Gauge will operate continuously for approximately 30 hrs
when fitted with Duracell Procell Alkaline 1500 mA/hr batteries.
A graphic battery icon on the right of the display shows the battery
level. Pressing the down arrow key also displays full screen battery
level gauge.
Battery almost full
Battery about 1/3 full
Battery Level Gauge
Low Battery Warning
The Gauge will periodically flash a Low Battery warning message
when the batteries have approximately 1 hour of use remaining.
When the batteries are exhausted the Gauge will display a Flat
Battery message for 5 seconds then turn off automatically.
4. Probes & Membranes
The Gauge should only be used with Soft-Faced probes
supplied by Cygnus Instruments.
Cygnus Soft-Faced probes are fitted with a Polyurethane
Membrane which provides better contact on rough surfaces and
protects the probe face from wear, prolonging the life of the
probe.
Check the membrane regularly as it is important the membrane is
changed as soon as it shows any signs of wear.
Probe Body
Locking Ring
Polyurethane Membrane
Knurled Ring
Probe Selection
Apart from the physical limitation of the probe size, the diameter
of the probe face (crystal) and the frequency affects the probe
performance, generally:
Large diameter probes produce more energy which gives
better performance on heavily corroded materials.
Higher Frequency probes produce a narrower focused beam
which is better when looking for small features or on thin
Lower frequency probes offer better penetration on heavy
corrosion/coatings.
Changing the Membrane
1. Unscrew the Knurled Ring from
the end of the Probe
2. Use the Locking Ring Key to
unscrew the Locking Ring from
inside the Knurled Ring. The old
membrane can then be removed
and discarded.
3. Place a new membrane into the
end of the Knurled Ring ensuring
it locates in the groove.
4. Screw the Locking Ring back
inside the Knurled Ring and
tighten with the Locking Ring
Key.
5. Place a few drops of Membrane
Couplant on to the probe face.
6. Screw the Knurled Ring back
onto the probe. Use your thumb
to squeeze the couplant from
under the membrane as you
tighten the Knurled Ring down
7. You should see the membrane
has a very thin film of couplant
between itself and the probe
face with no air bubbles.
Probe Selection & Specifications
Crystal Frequency Measurement Application
Diameter Range
13 mm 2 MHz 3.0 250 mm 1 This is the standard probe
inch 0.12 10 inch suitable for most
13 mm 3 MHz 2.0 150 mm Suitable for measurement on
inch 0.08 6 inch thinner sections where
surfaces are relatively rough
6 mm 5 MHz 1.0 50 mm The higher frequency and
inch 0.04 2 inch narrower beam makes this
Probe ideal for measuring
small-bore tubing, thin section
plate and other areas where
access is limited.
13 mm 5 MHz 1.0 50 mm Ideal for thin sections without
inch 0.04 2 inch heavy corrosion.
Probe Frequency Identification
The frequency of Cygnus probes is indicated by colour;
Red = 2.25 MHz Orange = 3.5 MHz Black = 5.0 MHz
Old Style Inox Probes with Inox Remote
Probes BNC Connectors Probes
Coloured Probe Face Coloured Ring under Coloured Band on
BNC connector Probe Cap
To measure thicknesses on tall thin cylinders or columns the height-width ratio should be no
less than 1.0:0.6 (Height:Width) otherwise side reflections prevent measurement.
5. Gauge Setup
Gauge Menu Diagram
+ SET
Calibrating the Gauge
The Gauge is supplied tested and calibrated to BS EN 15317:2007.
The Gauge will have been calibrated to measure thickness
through steel (grade S355JO).
Either a 15mm or 1/2 Test Block is supplied with the kit so the
Gauge can be quickly checked for correct operation. Note, this test
block is not intended to be used for calibration of the Gauge.
The best way to calibrate the Gauge is to Calibrate using a
Known Thickness using a sample of the material you intend to
measure. This method determines the velocity of sound for
the material sample, which will always be more accurate than
using a general velocity value. For calibration instructions
see page 23.
If there is no test sample available the Gauge can be calibrated by
Setting the Velocity of Sound directly. A table on page 35 at the
back of this manual lists common materials and their velocity of
sound value. For calibration instructions see page 24.
A third method is to leave the Gauge set to its factory-preset value
for Steel [5920 m/s or 0.2332 in/us], and then use a Conversion
Factor from the table of velocities on page 35.
Calibrating to a known thickness (Single Point)
This method of calibrating the Gauge is the most accurate as the
Gauge calculates the velocity of sound for the sample material.
1. Accurately measure the 25.40 mm
thickness of your sample
2. Place the Probe on the sample
so the Gauge is displaying a
thickness value.
3. Press the SET button once to
display the Gauge setup menu. SET x1
4. The display shows the current
5. Use the buttons to change
the thickness value until it reads
the correct value as measured.
6. Press the SET button to save the
new calibration. SET
Setting the Velocity of Sound
The Gauge uses the Velocity of Sound value to calculate the
material thickness value from the matched triple-echo time.
A table at the back of this manual lists velocity of sound values for
common material.
1. Ensure the probe is not touching
anything so the Gauge is not
displaying a thickness value.
Velocity of Sound value.
the value.
new velocity value. SET
The Gauge can display thickness measurements in either Metric
(mm) or Imperial (inch). Changing the measurement units will not
affect the calibration.
1. Press the SET button 2 times to
enter the Gauge setup menu and SET x2
display the Measurement Units
new Measurement Units SET
Resolution Setting
The Gauge can display the thickness measurements in two
resolutions:
High Resolution : 0.05 mm / 0.002 inch
Low Resolution : 0.1 mm / 0.005 inch
To change the Resolution setting:
display the Resolution setting
new Resolution setting SET
Valid Thickness Measurement Beep
The Gauge can beep when a valid thickness measurement has
display the Beep setting
Beep setting ON or OFF
new Beep setting SET
Display Brightness Setting
The OLED display has three levels of brightness:
High (Most power from the battery)
Low (Least power from the battery)
To change the Brightness setting:
display the Resolution setting.
Brightness setting.
new Brightness setting. SET
Automatic Probe Frequency Setting.
The Gauge will automatically detect the frequency of the probe
connected and set the Gauge accordingly. When a probe of a
different frequency is connected the display will briefly show the
new probe frequency detected.
Probe Connected Display
2.25 MHz Probe
3.5 MHz Probe
6. General Points On Thickness Gauging
On very rough surfaces and especially if both sides are badly
corroded, it is often necessary to move the Probe around to locate
a back wall reflector. Sometimes a slight rocking movement can
help find reflectors which are otherwise impossible.
Badly corroded sections can also be soaked with a light lubricating
oil to improve ultrasound coupling through to the good material.
Always ensure that there is plenty of couplant present for good
contact, but beware that on a pitted surface the Gauge may just
measure the couplant-filled pit, always avoid measuring directly
over external pits.
Beware that in extreme conditions or if the plate is of poor quality
and contains many inclusions the ultrasound will be scattered to
such an extent that measurement may not be possible.
Beware that the multiple-echo technique will not work if the front
and back surfaces of the material being measured are not close to
parallel. Also note that long narrow bars cannot be gauged along
their length with the multiple-echo method.
The Gauge should not be used near arc-welding equipment, as this
affects its performance.
The Gauge will not Switch On
Are the batteries dead?
Check the batteries are inserted correctly.
Difficulty obtaining a Reading
If there is 1 single flashing bar on the display - this means the
Gauge is not receiving any echoes:
Check that the Probe-lead is properly connected to both
Probe and Gauge.
Check the condition of the lead, replace if necessary.
If there is mostly 1 fixed bar plus 1 flashing bar this means that
the Gauge is having difficulty obtaining more than one echo:
Check the Probe and its membrane are properly assembled.
If there are up to 3 fixed bars plus 1 flashing bar, but never any
reading - this means the Gauge is receiving unrelated echoes from
more than one reflector:
On heavily corroded areas this is often a problem, try and
take measurements in adjacent areas of the same material.
Check the Gauge and Probe together on a test block, if there
is still no reading the Gauge may require servicing.
If Readings are Erratic or Unstable
Check that the Probe and its membrane are correctly
assembled with sufficient couplant between the probe face
and membrane.
Check the Probe-frequency is suitable for the probable
minimum thickness of the material being measured. Probe
frequencies too low cause doubling and tripling of the actual
8. The 4 Point Check
The most frequent reasons found to cause difficulty getting
readings are:
1. Is the Probe-membrane fitted correctly?
Check that there is a thin layer of oil between the membrane
and Probe-face, and with no air-bubbles trapped. See
Changing the Membrane on Page 19.
2. Is the Probe-lead OK?
Check the probe lead is in good condition and is correctly
inserted into the Probe and the Gauge. See Connecting the
Probe on Page 10
3. Is there adequate couplant applied to the material being
measured, and is the surface properly prepared?
Check there is plenty of couplant gel applied and there are no
air-gaps between the Probe and the material when
measuring. See Taking a Thickness Measurement on Page 15.
4. Is the material measurable at all?
Are the front and back faces of the material parallel?
Is the material too heavily corroded?
Is the material too thin for the Probe being used?
It is often worth confirming that the Gauge is operating OK using a
test sample, and also to confirm that the material can actually be
measured by ultrasonic multiple-echo thickness measurement.
9. Care and Servicing
Cleaning the Gauge
Clean the Gauge and accessories with a damp cloth. Use
water with a mild detergent household cleaner.
Do not use solvents to clean the Gauge.
Do not use any abrasive cleaner, especially on the display
Do not immerse the Gauge in liquid when cleaning.
Always remove the batteries if the Gauge will not be used for
more than a few days.
Only use leak-proof batteries, Cygnus recommend Duracell
Procell batteries.
Do not immerse the Gauge in liquids.
Do not subject the Gauge to temperatures greater than 60C
(140F).
Do not store the Gauge for long periods in conditions of high
humidity.
There are no user serviceable parts inside the Gauge.
Therefore all repair work should be carried out by Cygnus
Instruments or by an Authorised Cygnus Service dealer.
Returning the Gauge for Servicing
A full Manufacturers Factory Service is available from Cygnus
Instruments.
The Complete Kit should always be returned for Service or
Repair, including all Probes and Leads.
Cygnus Gauges are renowned for their reliability, very often
problems with getting measurements are simply due to the way
the Gauge is being used. See Troubleshooting on Page 29.
However, if you do need to return your Gauge for Repair please let
us know the details of the problem, to help us guarantee the best
possible service:
Is the problem Intermittent Behaviour?
Is there a problem turning the Gauge On?
Or a problem with the Gauge turning itself Off?
Does the Gauge constantly give Incorrect Readings, or
Unsteady Readings?
Is it not possible to Calibrate the Gauge?
10. Information
General Attributes
Size 85 mm x 115 mm x 25 mm (3.3 x 4.5 x 1.0)
Weight 275 g (9.7 oz) Including Batteries
Power Supply 2 x AA Alkaline Cells.
Probe Lead Connectors Lemo 1S 75 Ohm to Lemo 00 or BNC.
Battery Operation Time Approximately 30 hrs with alkaline 1500 mA/hr batteries.
Battery Voltage Range Min 2.0 V DC, max 3.2 V DC
Operating Temperature Range -10C to +50C (14F to 122F)
Storage Temperature Range -10C to +60C (14F to 140F)
Low Battery Indication Low Battery flashed on Display when approximately 1 hr of
operating time remains, assuming alkaline batteries.
PRF 602 Hz
Monitor Outputs N/A
Through Coating Coatings up to 6 mm thick as standard.
Measurements. Coatings up to 20 mm thick in Deep Coating 2 mode.
Materials Sound Velocity from 2000 m/s to 7000 m/s
[0.0800 in/uS to 0.2780 in/uS]
Measurement Range Measurement Ranges in Steel:
2 MHz probe 3 mm to 250 mm [0.120 in. to 10.00 in.]
3 MHz probe 2 mm to 150 mm [0.080 in. to 6.000 in.]
5 MHz probe 1 mm to 50 mm [0.040 in. to 2.000 in.]
Accuracy 0.05 mm (0.002) High Resolution Mode
0.1 mm (0.005) Low Resolution Mode
Resolution 0.05 mm (0.002) High Resolution Mode
Type of Display Graphic Organic LED Display, 128x32 Pixels, Cyan.
Display Size 8 mm High.
Shape of Pulse Square
Pulse Energy : Voltage (peak- 30 V p-p
to-peak)
Pulse Energy : Rise Time 25 nS (max)
To use Deep Coat mode consult Cygnus Instruments Ltd.
Pulse Energy : Pulse Duration 110 ns / 135 ns / 230 ns (5 MHz, 3.5 MHz, 2.25 MHz)
Gain Control Automatic Gain Control up to pre-set Maximum Gain value.
Frequency Range 1.5 MHz to 5.0 MHz (-6dB)
Data Output and Storage. N/A
Calibration setting storage. Calibration data stored in non-volatile EEprom memory.
Calibration Mechanisms. N/A (Multiple Echo Gauge)
Display & Recall Facilities. N/A
Display Response Time. 500 ms
Printer Output. N/A
Environmental Rating. IP65 & IP67
Compliance. CE Marked.
RoHS Compliant.
Specifications are subject to change for product improvement.
Table of Sound Velocities
Velocities will vary according to the precise grade and processing
conditions of the material being measured.
This table is included as a guide only.
Wherever possible, the Gauge should always be calibrated on
the material under test.
These Velocities are given in good faith and are believed to
be accurate within the limits described above.
No liability is accepted for errors.
Velocities given are the compressional wave velocity cl.
Velocity of Sound (V) Conversion
m/s in/us Factor (f)
Aluminium (alloyed) 6380 0.2512 1.078
Aluminium (2014) 6320 0.2488 1.068
Aluminium (2024 T4) 6370 0.2508 1.076
Brass (CuZn40) 4400 0.1732 0.743
Brass (Naval) 4330 0.1705 0.731
Copper 4700 - 5000 0.1850 0.1969 0.794 0.845
Core Ten 5920 0.2331 1.000
Grey Cast Iron 4600 0.1811 0.777
Inconel 5700 0.2244 0.963
Lead 2150 0.0846 0.363
Monel 5400 0.2126 0.912
Nickel 5630 0.2217 0.951
Phosphor Bronze 3530 0.1390 0.596
Mild Steel 5920 0.2331 1.000
Tool Steel 5870 0.2311 0.992
Stainless Steel 302 5660 0.2228 0.956
Tin 3320 0.1307 0.561
Titanium 6100 - 6230 0.2402 0.2453 1.030 1.052
Tungsten Carbide 6660 0.2622 1.125
Epoxy Resin 2500 0.0986 0.422
Acrylic 2730 0.1076 0.461
Nylon (Polyamide) 2620 0.1032 0.443
Reading Conversions
If only a few measurements are to be taken on a material other
than Steel, it may be easier to leave the calibration set for Steel
and merely convert the readings by multiplying by the
Conversion Factor for the material being measured.
This method avoids unnecessary recalibration.
The Gauge is calibrated for Steel [5920 m/s], but the reading is
being taken on Copper [4700 m/s] :
T = t x VCOPPER / VSTEEL
= t x 4700 / 5920
= t x 0.794
thus : T = t x f [ where: f = VCOPPER / VSTEEL ]
where : T = true thickness of Copper being measured
t = actual reading obtained
f = Conversion Factor (from table)
VCOPPER = Sound Velocity in Copper : 4700 m/s
VSTEEL = Sound Velocity in Steel : 5920 m/s
The Conversion Factor f: is given for various materials in the
11. Accessories List.
Remote Probes with 1.35 m (46) lead.
All probes are fully assembled and include a spare membrane
pack, knurled ring locking key and probe cable.
004-9310 Remote Probe 2.25MHz 13mm (1/2) BNC
004-9313 Remote Probe 3.5MHz 13mm (1/2) BNC
004-9314 Remote Probe 5.0MHz 6mm (1/4) Lemo 00
corrosion/coatings. Please refer to page 20 for correct probe
selection.
Marinised Probes with Cable length to order.
For divers taking underwater thickness measurements down to
60m (approx 200ft) maximum whilst keeping the Cygnus 2 on the
surface. Alternatively please visit:
www.cygnus-instruments.com/english/cygnus1uw.html for full
details on the Cygnus Underwater thickness gauge.
002-9387 Marinised Probe 2.25MHz 13mm (1/2) UW remote
probe with Lemo 1 plug
002-9389 Marinised Probe 3.5MHz 13mm (1/2) UW remote
Marinised Probe 5.0MHz 6mm (1/4) UW remote probe
with Lemo 1 plug
002-9390 Marinised Probe 5.0MHz 6mm (1/4) UW remote probe
corrosion/coatings. Please refer to page 20 for correct
probe selection.
Probe Spares and Membranes
Polyurethane Membranes are for normal use on surface
temperatures up to 75C.
Teflon Membranes are for use on surface temperatures up to
001-3702 Standard Membranes (polyurethane) (20pk)
13mm (1/2)
001-4873 Teflon Membranes (10pk) (High Temperature)
001-3706 Membrane Couplant
001-3707 UCA-2M Ultrasonic Couplant Gel (1 litre tub)
001-3708 UCA-2M Ultrasonic Couplant Gel (100 ml)
001-3717 Spares Kit Cygnus 2,3 or 4 Gauge consisting of
1 x Standard Membranes (20pk) & Membrane
Couplant
Cables and Leads
004-0406 Probe Cable: Blue High-Flex BNC to Lemo 1 (STD)
1.35m (46) As supplied with standard probe.
004-0401 Probe Cable: Lemo 00 to Lemo 1 (STD) 1.35m
(46). For use with 6mm 5 MHz probe.
Electronic Bodies Only
002-7173/4 Cygnus 2 Mk4 electronics body only
001-4850 Steel Test Block 15 mm
001-4851 Steel Test Block
001-4852 Coated Test Block
001-4856 Carbon Steel Step Block 5-25 mm in 5 mm steps set
in perspex
002-4834/4 Cygnus 2/4 Mk 4 carry case with foam
002-4835/4 Cygnus 2/4 Mk 4 silicone instrument sleeve with belt
clip stud
002-4836/4 Cygnus 2/4 Mk 4 belt clip
002-4837/4 Cygnus 2/4 Mk 4 fabric accessories pouch
12. EU Declaration of Conformity
Manufacturer Cygnus Instruments Ltd.
Address 30 Prince of Wales Road, Dorchester, Dorset. DT1 1PW.
Equipment Cygnus 2 - Digital Ultrasonic Thickness Gauge (Mk4)
Description Battery powered, hand held, digital ultrasonic thickness
gauge.
Directive 2004/108/EC - Electromagnetic Compatibility (EMC)
Applied EMC test standards:
Emissions: EN 61326-1:2006
Radiated disturbance - CISPR 11:2003, Class A
Immunity: EN 61326-1:2006
Electrostatic discharge - IEC 61000-4-2:2001
Radiated RF interference - IEC 61000-4-3:2002
(Test requirements for portable test and measurement equipment (Annex A))
On behalf of Cygnus Instruments Ltd, I declare that on the date the
equipment accompanied by this declaration is placed on the market, the
equipment conforms with all technical and regulatory requirements of the
above listed directives.
13. Recycling and Disposal (EC Countries)
The WEEE Directive (Waste Electrical and Electronic Equipment
2002/96.EC) has been put into place to ensure that products are
recycled using best available treatment, recovery and recycling
techniques to ensure human health and high environmental
protection.
The Gauge has been designed and manufactured with high quality
materials and components which can be recycled and reused. It
may contain hazardous substances that could impact health and
the environment. In order to avoid the dissemination of those
substances in our environment and to diminish the pressure on
natural resources we encourage you to dispose of this product
DO NOT dispose of this product with general household
waste.
DO dispose of the complete product including cables,
plugs and accessories in the designed WEEE collection
facilities.
This product may also be returned to the agent or manufacturer
who supplied it for safe end-of-life disposal.
Cygnus Instruments Ltd registration number for The WEEE
Directive is WEE/HE1274RU.
14. Index
Accessories List Echo Strength, 15
Cables and Leads, 40 Gauge Controls, 13
Carry Cases, 40 Gauge Menu, 21
Electronic Bodies Only, 40 Imperial, 25
Knurled Rings, 40 Metric, 25
Marinised Probes with cable, Neck Strap, 12
38 Pitted surface, 28
Miscellaneous Spares, 40 Polyurethane Membrane, 18
Probe Spares and Power button, 14
Membranes, 39 Probes
Remote Probes with Lead, 37 Knurled Ring, 19
Automatic Power Off, 14 Locking Ring Key, 19
Automatic Probe Frequency, 27 Membrane Couplant, 19
Batteries Probe Cable, 10
Fitting, 9 Selection, 18
Incorrect Insertion, 9 Specifications, 20
Level, 16 Pulse-echo, 6
Life, 16 Recycling, 42
Low Battery Warning, 17 Repair, 32
NiCad, 9 Resolution, 25
NiMH, 9 Rough surfaces, 28
Beep, 26 Service, 32
Belt Strap, 12 Silicone Sleeve, 11
Brightness, 26 Sound Velocities, 35
BS EN 15317:2007, 22 Specifications, 34
Calibration, 22 Test block, 22
Conversion Factor, 36 Thickness Measurement, 15
Known Thickness, 22 Triple Echo Verification, 6
Single Point, 23 Troubleshooting, 29
Velocity of Sound, 24 Units, 25
Cleaning, 31 Unrelated echoes, 29
Deep Coating, 33 WEEE Directive, 42
Disposal, 42
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