Cygnus Ultrasonic Thickness Gauge

Cygnus Thickness Gauge mounted on Blueye X3

Overview

Introduction
How to install
How to use
Specifications
Operation Manual

Introduction

Cygnus Ultrasonic Thickness Gauge is a peripheral that can be used with the Blueye X3 to measure the thickness of different constructions and materials underwater.

Thickness measurements are verified with a multiple echo technique, and the integration gives reliable measurements on corroded and coated surfaces.

The measurements are given with an accuracy of 0.1 mm, even through coatings and soft marine growth.

Live readings are displayed in the Blueye app, and measurements can be overlayed in video recordings and still pictures.

How to install

Communication cable

The communication cable from the Cygnus gauge body to the Blueye X3 comes pre-installed on your X3. The following instructions describe the steps to connect the Cygnus gauge body and probe handler to the X3 vehicle.

The Cygnus Ultrasonic Thickness Gauge must be connected to Guest Port 1 (GP1).

Attach the probe to the Blueye X3

Assemble the Cygnus gauge and probe as described in Chapter 3 of the Cygnus operation manual.

The mechanical parts needed for installation onto the X3.

Insert the two long screws into the black u-shaped mount.

Insert the short screws on the sides with the washer inside the mount.

Tighten the two side screws, make sure the washer is in place and the plastic parts can move freely.

Insert the connector for the communication cable in GP1. Make sure the drone is powered off before unplugging/plugging any connectors!

Guide the black guest port cable as shown in the picture.

Connect the communication cable to the Cygnus unit.

Place the plastic wedge between the battery tube and the Cygnus unit.

Use the rubber strap to tighten down the Cygnus unit. You can tuck any leftover cable under the strap after completing the assembly.

Insert the U-shaped mount in the two mounting holes at the front of the drone.

Tilt the probe at a max angle upward while attaching the cable to the zip-tie mounts to ensure it can move freely. Attach the second zip-tie mount and tuck any loose cable under the rubber strap.

How to use

Software integration

App usage

Before diving with the thickness gauge, the probe membrane should be inspected. If there are air bubbles or damage to the membrane, it must be replaced as described in the operation manual.

Make sure that the material type to be inspected is chosen in the Cygnus settings menu. The selected material can be changed at any time during a dive.

Select material on the Cygnus setting page

To display thickness measurements in the video recording, you have to turn on the video overlay in the setting menu and press the record button or (X) when in-dive.

Turn on video overlay to display measurements in video recording

Align the probe to the surface you want to measure, and live thickness readings are displayed. A value is only displayed when it is verified with Triple Echo Verification. When a value is not verified, but the probe is measuring echoes, it will be displayed as dashes.

Measurement value displayed in Blueye App

To capture a still picture of the measurement, simply hold (LB) or (RB) while pressing (X). The still pictures will be included in the automatically generated report. The report can be shared immediately after the dive, and you have the option to add comments.

Share automatically generated reports with still pictures

Learn more about how to transfer and edit the report. You can also create a custom report template for your inspections.

Material selection

Velocities will vary according to the precise grade and processing conditions of the material being measured. The table below includes the available material options. The Blueye app will convert the measured thickness to the actual thickness for a given material based on the selected material option.

If the material you are measuring is not included in the table below, use the Core Ten Steel EN12223 S355-J0 material, and perform the conversion manually after the inspection is completed, as described on page 54 in the Cygnus operation manual.

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 limits described above. No liability is accepted for errors.

Available material options

Material	m/s	in/us	Conversion Factor
Aluminium (alloyed)	6380	0.2512	1.078
Aluminium (2014)	6320	0.2488	1.068
Aluminium (2024 T4)	6370	0.2508	1.076
Aluminium (2117 T4)	6500	0.2559	1.098
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
Grey Cast Iron	4600	0.1811	0.777
Inconel	5700	0.2244	0.963
Lead	2150	0.0856	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	1.00
Tool Steel	5870	0.2311	0.992
Stainless Steel 302	5660	0.2228	0.956
Stainless Steel 347	5190	0.2279	0.978
Stainless Steel 314	5715	0.2250	0.965
Stainless Steel 316	5750	0.2264	0.971
F51 Duplex Steel UNS S31803	5715-5750	0.225-0.2264	0.956-0.971
Core Ten Steel EN12223 S355-J0	5920	0.2331	1.00
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

Regarding 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. See page 54 in the Cygnus operation manual for details about conversion between measurement values.

Specifications

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Operation Manual

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