Cygnus 1 User manual
CYGNUS 1
Digital Ultrasonic
Thickness Gauge
CYGNUS
INSTRUMENTS
Ultrasonic NDT Equipment
OPERATION MANUAL
ROV-MOUNTABLE
SYSTEM
CYGNUS 1 ROV ULTRASONIC
THICKNESS GAUGE
ROV-MOUNTABLE SYSTEM
V6.21A - Jul 06 S.074 / Issue 2
2
QUALITY POLICY STATEMENT
“It is the policy of Cygnus Instruments to provide all customers with products and
services of a quality that complies in all respects with the requirements contained in
their orders and specifications.
“It is our firm belief that excellence can only be achieved and maintained by
continual appraisal. The organisation, methods, and procedures adopted by the
company aim to both fulfil this policy and ensure adherence to it.”
Cygnus is an ISO-9001 accredited company.
The scope of our accreditation covers all our products and services.
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Content
3
CYGNUS 1 ROV
ULTRASONIC THICKNESS GAUGE
OPERATION MANUAL
INTRODUCTION 5
Cygnus 1 ROV Ultrasonic Thickness Gauge 6
Cygnus Instruments 7
The Multiple-Echo Method 8
Cygnus 1 ROV Specification – Deep-Water Gauge 9
Cygnus 1 ROV Specification – Shallow-Water Gauge 10
Cygnus 1 ROV Specification – Mini-ROV Lightweight Gauge 11
Selection of Ultrasonic Probes 12
Serial Data Format 13
INSTALLING THE UNDERWATER GAUGE 15
Cygnus 1 ROV Kit Contents – Deep-Water & Shallow-Water Gauge 16
Cygnus 1 ROV Kit Contents – Mini-ROV Lightweight Gauge 17
Gauge Assembly & Disassembly 18
Underwater Cable Connector 18
Probe/Knurled Ring Assembly 20
Data & Power Connections 21
VIEWING MEASUREMENTS ON THE PC 23
Computer Connection Options 24
Installing the CygLink Program 25
Installing the USB-to-Serial Adaptor Drivers 26
Connecting the System Together 27
Using the CygLink Remote Display Program 31
Content
4
MEASURING WITH THE GAUGE 34
Controls 35
Calibrating the Gauge 35
Measurement 38
Probe Usage 39
Troubleshooting 40
General Points on Thickness Gauging 42
A Guide to Sound Velocities 43
Table of Sound Velocities 44
WORKING WITH LOG-FILES 45
About Log-Files 46
Viewing Log-Files 47
Creating a Report File 48
Printing Files Using CygLink 50
File Format 51
CREATING TEMPLATE-FILES USING CYGLINK 52
About Template-Files 53
Creating a Single-Record File 54
Creating a Multi-Record File 55
Creating a Key-Point File 56
Creating a Grid-Point File 61
REMOTE-LOGGING 63
Using Remote-Logging 64
Quick Logging 65
Remote-Logging to Datalogger Files 68
Logging to a Single-Record File 69
Logging to a Multi-Record File 71
Logging to a Key-Point File 72
Logging to a Grid-Point File 74
CARE AND SERVICING 80
Care of the Cygnus 1 ROV Gauge 81
Servicing 82
Recycling & Disposal 83
RoHS Directive 83
Introduction
5
INTRODUCTION
Cygnus 1 ROV Ultrasonic Thickness Gauge
Cygnus Instruments
The Multiple-Echo Method
Cygnus 1 ROV Specification – Deep-Water Gauge
Cygnus 1 ROV Specification – Shallow-Water Gauge
Cygnus 1 ROV Specification – Mini-ROV Lightweight Gauge
Selection of Ultrasonic Probes
Serial Data Format
Introduction
6
CYGNUS 1 ROV ULTRASONIC THICKNESS GAUGE
The Cygnus 1 ROV Multiple-Echo Ultrasonic Thickness Gauge is designed for high-
reliability thickness measurement using the multiple-echo technique.
The Gauge is designed to be mounted onto most types of work-class ROV with or without a
manipulator facility. There is also a lightweight version of the Gauge for use with smaller
ROVs.
All versions of the Gauge are fully-waterproof, and can be used both underwater and in air -
Cygnus manufactures the Cygnus 1 ROV Thickness Gauge in three system options :
¾Deep-Water Version :
pressure-tested down to 3000 metres
¾Shallow-Water Version :
pressure-tested down to 1000 metres
¾Mini-ROV Lightweight Version :
pressure-tested down to 500 metres
All versions of the Gauge are supplied with dedicated PC-software for displaying and
logging the thickness readings at the surface.
The Gauge is supplied with one Ultrasonic Probe – the Probe-type must be specified at the
time of purchase of the Gauge. Probes are not freely interchangeable – please consult with
Cygnus if you wish to use a different Probe with the Gauge.
The Cygnus 1 ROV Ultrasonic Thickness Gauge is a solid-state electronic instrument
which, under normal operating conditions, will give many years of active service.
Although designed for ease of operation, the first time user should carefully read this manual
to familiarise themselves with the features of the instrument.
Introduction
CYGNUS INSTRUMENTS
Cygnus Instruments Limited, founded in 1983, were pioneers in the development of the
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 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.
website : www.cygnus-instruments.com
CYGNUS Instruments Limited CYGNUS Instruments Inc.
Cygnus House 1993 Moreland Parkway
30 Prince of Wales Road Suite 202
Dorchester Annapolis
Dorset DT1 1PW Maryland 21401
England USA
Tel: 00 44 (0) 1305 265533 Tel: 00 1 410 267 9771
Fax: 00 44 (0) 1305 269960 Fax: 00 1 410 268 2013
7
Introduction
THE MULTIPLE-ECHO METHOD
The Cygnus 1 ROV Ultrasonic Thickness Gauge works on the pulse-echo principle. The
Probe is made to vibrate for a very short period, creating a pulse of ultrasound which enters
the test piece. The Probe waits for returned echos and acting as a receiver, converts them
into electrical signals which are processed to produce timings in digital form.
The multiple-echo beam travel is depicted above, spread out for time, to illustrate the timing
method. The beam path is in fact straight, at 90 degrees to the surface and the ultrasonic
energy reverberates up and down within the metal (as shown in the small sketch above -
left). Each time the echo is reflected back down, a small portion of the energy comes up
through the coatings, striking the Probe which now acts as a receiver.
The delay between echoes at the Probe-face 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 of the metal thickness only.
8
Introduction
9
CYGNUS 1 ROV SPECIFICATION – DEEP-WATER GAUGE
Materials
Sound Velocity from 1000 m/s to 9995 m/s
[0.0400 in/uS to 03998 in/uS]
Range
Typical Measurable Range in Steel :
with 2¼ MHz Probe : 3mm to 250mm [0.120 in. to 10.0 in.]
with 3½ MHz Probe : 2mm to 150mm [0.080 in. to 6.0 in.]
Resolution
0.1 mm [0.005 in.] or
0.05 mm [0.002in.]
Accuracy
± 0.1 mm [± 0.005 in.] or
± 0.05 mm [± 0.002 in.]
Probes
Single-Crystal, Soft-face Compression Probes :
¾2¼ MHz : 13mm [0.5 in.]
¾2¼ MHz : 19mm [0.75 in.]
¾3½ MHz : 13mm [0.5 in.]
Operating
Temperature
Recommended :
-10°C to +50°C [14°F to 122°F]
Power Supply
Power Supply Requirement :
7.5 – 30 Vdc @ 100mA typical, 150mA maximum
Data-link
RS-422 Communication, differential pair, single direction
Display
Software
Computer Requirement :
Windows®-compatible PC or Laptop (486 minimum) with 45
MB free hard disk space
One free Serial COM-port, or a USB connection
Size
Gauge-Body dimensions, excluding cabling :
Length 237 mm x Diameter 70 mm [9.3 in. x 2.8 in.]
Probe-Cable length : 5 metre [16 ft. 5 in.]
Weight in Air
With Remote Probe – 4.0 Kg [141 ounce]
Water Depth
Fully Waterproof :
Pressure tested to a depth of 3000 m [9842 ft.]
Table of contents
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