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Altitude, Pitch, Roll &
Installation & Operation
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ISA500
Heading Sensor
Manual
Revision:
1.1
Date:
07/10/2015
www.impactsubsea.com
www.impactsubsea.com
www.impactsubsea.com
www.impactsubsea.com
Innovative Underwater Products
Innovative Underwater Products
Innovative Underwater Products
Innovative Underwater Products
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Table of Contents
Related Manuals for ImpactSubsea ISA500
Summary of Contents for ImpactSubsea ISA500
- Page 1 Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products ISA500 Altitude, Pitch, Roll & Heading Sensor Installation & Operation Manual Revision: Date: 07/10/2015 lr-1| "†0v;- |7 bm=o blr-1|v†0v;- 1o †h ‰‰‰ blr-1|v†0v;- 1ol...
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Page 2: Table Of Contents
4.2 Mounting .........................9 4.3 Electrical Installation.....................10 4.3.1 Connector Pin Out....................10 4.3.2 Connector Mating....................11 4.3.3 Connector Cleaning....................11 5.0 Software & Configuration......................12 ISA500 Page............................17 6.0 Maintenance..........................26 7.0 Theory Of Operation........................27 7.1 Altitude - Basic Principles....................27 7.2 The Sonar Equation......................29 7.2.1 Source Level (SL)....................29 7.2.2 Transmission Loss (TL)..................30... -
Page 3: Introduction
Pitch, Roll and Temperature readings. Utilising a broadband composite transducer and advanced digital signal processing techniques; enables the ISA500 to achieve long range capability with a high degree of accuracy and stability. The availability of heading, pitch and roll provides the capability to clearly understand the orientation of the unit at all times. -
Page 4: Specification
Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products 2.0 Specification 2.1 Unit Overview 2.2 Unit Dimensions All dimensions are in mm. © Impact Subsea Ltd... -
Page 5: Acoustic, Heading, Attitude & Temperature
Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products 2.3 Acoustic, Heading, Attitude & Temperature Acoustic Attitude Frequency 500kHz Standard Pitch Range ± 90° (400 to 600kHz Roll Range ± 180° Selectable) Range 0.1 to 120m... -
Page 6: Overview
Diagram 1 Diagram 2 The ISA500 times how long the acoustic wave takes to travel from the ISA500, to the seabed and back again. With this time value, combined with a knowledge of the speed of sound in water, the distance/altitude can be calculated. -
Page 7: Installation
– see Section 5 for details. 4.1.2 Magnetic Disturbers (For Maximising Heading Performance) Where the heading output is to be used, the ISA500 should be mounted as far as possible from sources of magnetic interference. -
Page 8: Alignment With Vehicle (For Maximising Pitch/Roll Accuracy)
4.1.4 Heat Sources (For Maximising Temperature Accuracy) In order for the ISA500 to read the ambient temperature of the water, it should not be installed in close proximity of any heat sources (such as Hydraulic Power Packs). -
Page 9: Mounting
ISA500 due to housing degradation, resulting in a loss of water sealing capability. The ISA500 has two flats, on either side of the body – these are to enable the unit to sit tightly against another flat surface if available. These flats also help prevent the unit moving when on the workbench for testing. -
Page 10: Electrical Installation
Innovative Underwater Products Innovative Underwater Products 4.3 Electrical Installation The ISA500 is fitted with a SubConn MCBH8M-SS connector as standard. This will mate to a SubConn MCIL8F connector/cable assembly. 4.3.1 Connector Pin Out The standard connector pin out is provided below:... -
Page 11: Connector Mating
Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products 4.3.2 Connector Mating When mating the cable to the SubConn connector, to maximise the life of the connector, it is important to observe the following: Always apply grease before mating. -
Page 12: Software & Configuration
Innovative Underwater Products 5.0 Software & Configuration The ISA500 is supplied with its own bespoke software package, which can either be used to operate the unit or can purely be used to configure the unit to output a specific string. - Page 13 A - Distance This provides the distance which has been read from the ISA500 transducer to the target. In the majority of applications this distance is the Altitude (assuming the ISA500 transducer is pointing towards the seabed).
- Page 14 This is the button to access all of the settings for the topside computer. This is where you go first to setup your computer's Com port to talk to the ISA500. This button also provides access to the Log file setup. This allows you to set where log files are saved, and also what is saved in them.
- Page 15 ISA500 the connected unit's serial number will be shown. 5.3 Setup Setup is the first place to start – to establish communications between the ISA500 and your computer running the software. Upon clicking the 'Setup' icon, the following window will be displayed: A –...
- Page 16 D - Compass Offset The ISA500 provides heading to the local magnetic north. If you are aware of the difference between magnetic north and true north in your area of operation and offset can be entered here. This will allow the ISA500 software to display a True North Heading.
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Page 17: Isa500 Page
Innovative Underwater Products 5.4 ISA500 Clicking on the ISA500 button will take you to the units settings page, to setup and configure the ISA500 to operate as required. Typically the ISA500 will be supplied by Impact Subsea pre-set for your application. - Page 18 An accurate speed of sound is essential to ensure accuracy of Altitude measurement. Minimum Range This is the minimum range the ISA500 will detect down to. By default, this is set to 0.7 meters. If operating the ISA500 with a long range setting (such as 120 meters), 0.7m minimum range will ensure that the transmit pulse is not inadvertently detected as a return echo.
- Page 19 This can be useful to increase the update rate of the ISA500 if required (due to a longer time required to wait for a ping to return from 120m as opposed to say 50 meters.
- Page 20 ISA500. Output String This box allows selection of the output strings available from your ISA500 unit. If you require a particular string which is not present, please contact Impact Subsea support to have this added. The string selected will be output either by interrogation or autonomously –...
- Page 21 Select Edge & Enable/Disable For users who are interrogating the ISA500 via TTL, the 'Select edge' button will select which edge of the input signal the ISA500 will trigger on. Either the rising or falling edge of the signal. The Enable/Disable button will either enable TTL interrogation capability or disable it.
- Page 22 (up to 24mA) can be set using the lower right hand side box. In the above example the ISA500 is set to output a scales voltage from 0 to 5 VDC. i.e. At 0m range, 0VDC will be output. At 120m range, 5VDC will be output. All ranges in between will be output in a corresponding linear voltage between 0 and 5VDC.
- Page 23 Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products I - Calibrate The Calibrate button will take you to a calibration page for the heading sensor. This should ideally be carried out at each installation. This calibration is a hard and soft iron calibration –...
- Page 24 4. Once a reasonable spread of points has been acquired acquisition can be stopped. 5. If performing a calibration click Apply to save the calibration to the ISA500. The graphed Red points will re-plot in Green to show how the data just acquired would have looked with the new calibration values.
- Page 25 The 'Use max range for missed pings' can either be set to 'Yes' or 'No'. When set to 'Yes', if the ISA500 does not receive a return on a ping it has sent, it will output the full scale value (for example, it will read 120m if this is the maximum range the unit is set to).
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Page 26: Maintenance
Innovative Underwater Products Innovative Underwater Products 6.0 Maintenance The ISA500 is a highly robust Altitude and Attitude measurement device. The unit has been designed to require minimal maintenance, and as such there are no user serviceable components within the unit. -
Page 27: Theory Of Operation
Heading, Pitch, Roll and Temperature Readings. 7.1 Altitude - Basic Principles Throughout this section, Altitude is referred to – the ISA500 can equally be used to measure ranges underwater (vertical and horizontal). For simplicity, only Altitude is referenced here, however the same principles apply to range measurements. - Page 28 (temperature, salinity & pressure). However, for the purpose of this explanation, we will assume a speed of sound of 1,500m/s. For example, if an acoustic pulse takes 0.1 seconds to return to the ISA500 after being sent, we can calculate its round trip travel distance as: Distance = Speed x Time = 1,500 x 0.1...
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Page 29: The Sonar Equation
Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products 7.2 The Sonar Equation Any equipment which relies on acoustics underwater for ranging purposes, falls into the category of a Sonar, and hence the operation is governed by the 'Sonar Equation'. -
Page 30: Transmission Loss (Tl)
Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products 7.2.2 Transmission Loss (TL) As the acoustic pulse propagates through the water, it experiences spreading, which causes the energy of the signal to be dispersed over an ever increasing area. -
Page 31: Directional Index (Di)
An appreciation of the Sonar equation will provide an understanding of the fundamental operation of the ISA500. It may also help during installation and also when fault finding as it provides an indication as to influential factors. -
Page 32: Heading, Pitch & Roll
MEMS sensor to provide you with a Compass (Heading) and spirit level (Pitch/Roll). The ISA500 makes use of a MEMS sensor to provide heading, pitch and roll to an accuracy level to suit basic ROV/AUV navigation. -
Page 33: Warranty
What do you have to do? To obtain a warranty repair of your ISA500 unit, you must first contact us to determine the problem and the most appropriate solution for you. -
Page 34: Technical Support
Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products Innovative Underwater Products 9.0 Technical Support Should you require technical support for your ISA500 unit, our Support team can be contacted as follows: T. +44 (0) 1224 460 850 E. support@impactsubsea.co.uk www.impactsubsea.com...