Impact Subsea ISA500 Installation & Operation Manual
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Impact Subsea ISA500 Installation & Operation Manual

Altitude sensor with optional integrated ahrs
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IMPACT SUBSEA
INNOVATIVE UNDERWATER PRODUCTS
Installation & Operation Manual
T. +44 (0) 1224 460 850
E. info@impactsubsea.co.uk
W. www.impactsubsea.com
ISA500
Altitude Sensor
With optional integrated AHRS
Revision Number:
Date
I
mpact Subsea Ltd, Company Number: SC498003, Registered in Scotland, Registered
Office: Unit 10, Castle Street, Castle Road Industrial Estate, Ellon, AB41 9FR, UK
www.impactsubsea.com
2.0
th
8
July 2020

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  • Page 1 IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com ISA500 Altitude Sensor With optional integrated AHRS Installation & Operation Manual Revision Number: Date July 2020 T. +44 (0) 1224 460 850 mpact Subsea Ltd, Company Number: SC498003, Registered in Scotland, Registered Office: Unit 10, Castle Street, Castle Road Industrial Estate, Ellon, AB41 9FR, UK E.

  • Page 2: Table Of Contents

    IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com Introduction ........................3 Specification ......................... 4 2.1 Overview ........................... 4 2.2 Dimensions ........................4 2.2.1 Forward Looking Housing ..................4 2.2.2 Right Angle Housing ....................4 2.3 Acoustic, Heading, Attitude & Temperature ..............5 2.4 Communications, Power &...
  • Page 3 IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com Theory of Operation ......................26 7.1 Altitude - Basic Principles ....................26 7.2 The Sonar Equation ......................27 7.2.1 Source Level (SL)..................... 28 7.2.2 Transmission Loss (TL) .................... 28 7.2.3 Noise Level (NL) ...................... 28 7.2.4 Directional Index (DI) .....................

  • Page 4: Introduction

    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 5: Specification

    IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com 2.0 Specification 2.1 Overview ISA500 (Forward Looking Titanium Housing) ISA500 (Right Angle Acetal Housing) 2.2 Dimensions 2.2.1 Forward Looking Housing 2.2.2 Right Angle Housing All dimensions are in mm. All dimensions given in mm.

  • Page 6: Acoustic, Heading, Attitude & Temperature

    IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com 2.3 Acoustic, Heading, Attitude & Temperature Acoustic Attitude Frequency 500kHz Standard Pitch Range ± 90° (400 to 600kHz Selectable) Roll Range ± 180° Range 0.1 to 120+m Accuracy 0.2° (Maximum range dependant on seabed type: Ranges in excess of...

  • Page 7: Installation

    INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com 3.0 Installation 3.1 Electrical Installation The ISA500 is fitted with a SubConn MCBH8M-SS connector as standard. This will mate to a SubConn MCIL8F connector/cable assembly. 3.1.1 Connector Pin Out The standard connector pin out is provided below:...

  • Page 8: Power

    3.1.2 Power The ISA500 is polarity protected and fused with a 400mA resettable poly fuse. Internal circuitry isolates the supply from the outside environment requiring the serial interface, TTL trigger and analogue output to use the digital and analogue 0V reference pin.

  • Page 9: Rs485 Wiring

    The Analogue interface can be configured to output voltage or current. It is isolated from the supply and has in-line fused protection. A prolonged transient voltage on this line will blow the surface mount fuses which will require replacement by Impact Subsea or an approved distributor.

  • Page 10: Establishing Communications

    The default serial settings are RS232, 9600, N81 If the ISA500 is tilted from vertical to upside down 3 times within the first 10 seconds of power up then it will temporarily configure the serial interface to the default (RS232, 9600, N81) and output an ASCII message displaying the settings.

  • Page 11: Location

    ISA500 settings in seaView to see the various settings which can be adjusted. 3.2.2 Magnetic Disturbers (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 12: Alignment With Vehicle (Pitch/Roll Accuracy)

    3.2.4 Heat Sources (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 13: Mounting

    ISA500. 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 14: Operation

    Microsoft's .net framework 4.5.2 or above seaView uses an advance framed binary protocol to communicate to the ISA500 and can do so over RS232 or RS485 at any standard baud rates above 4800. The parity must be none, stop bits 1 and data bits 8.

  • Page 15: Integration With Systems

    Autonomous mode will make a measurement and output the result over serial or analogue at a specified time interval. The ISA500 can be configured to operate in one or both of these modes at the same time. ISA500's with the HMRU option make use of the same interrogated and autonomous mechanises to output heading pitch and roll data over the serial interface.
  • Page 16 These values can also give some insight for adjusting the transmit power. If the energy level is low then consider increasing the amplitude and length of the transmit pulse. The ISA500 does not average or filter readings in any way. This provides zero lag making it ideal for control systems.

  • Page 17: Servicing

    The unit should be stored in its original case, in a cool, dry place. It is recommended that the unit be returned to Impact Subsea Ltd, on an annual basis to have a health check and service conducted. Document No: 0000.1905 | Version No: 2.0 | 8...

  • Page 18: Output Strings

    = distance in meters from the transducer face to the target. tt.t = temperature in Celsius xx = NEMA standard checksum ID2: Impact Subsea altitude, signal level, correlation and temperature String format: $ISADI,ddd.ddd,M,e.eeee,c.cccc,tt.t,C*xx<CR><LF> ddd.ddd = distance in meters from the transducer face to the target.
  • Page 19 IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com ID4: Impact Subsea mutli echo output with signal level, correlation and temperature String format: $ISAMI,tt.t,C,ddd.ddd,e.eeee,c.cccc,...,...,...*xx<CR><LF> tt.t = temperature in Celsius ddd.ddd = distance in meters from the transducer face to the target. e.eeee = energy level (0 to 1) c.cccc = correlation factor (0 to 1)
  • Page 20 IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com ID8: Tritech multidrop String format: xddd.dddm<CR><LF> x = node address. This the the first character of the interrogation string. ddd.ddd = distance in meters from the transducer face to the target. ID9: Benthos String format: Rdd.dd<CR><LF>...
  • Page 21 $ISATS,dddddd,us,tt.t,C*xx<CR><LF> dddddd = time in micro seconds to target. tt.t = temperature in Celsius xx = NEMA standard checksum ID16: Impact Subsea time, energy, correlation and temperature String format: $ISATI,dddddd,us,e.eeee,c.cccc,tt.t,C*xx<CR><LF> dddddd = time in micro seconds to target. e.eeee = energy level (0 to 1) c.cccc = correlation factor (0 to 1)
  • Page 22 = NEMA standard checksum Example string format for 3 echoes (Note: 10 echoes maximum number of multi- echoes that can be detected): $ISAMD,tt.t,C,dddddd,dddddd,dddddd*xx<CR><LF> ID18: Impact Subsea temperature and multi echo (time) with energy and correlation String format: $ISAMV,tt.t,C,dddddd,e.eeee,c.cccc,...,...,...*xx<CR><LF> tt.t = temperature in Celsius dddddd = time in micro seconds to target.
  • Page 23 IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com ID20: NMEA $SDDPT String format: $SDDPT,x.x,x.x*hh First x.x = distance in meters from the transducer face to the target. Second x.x = Offset from transducer (positive means distance from transducer to water line, negative means distance from transducer to keel) *h.h = Checksum...
  • Page 24 INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com ID22: Impact Subsea Binary multi echo data Binary data frame containing a list of up to 100 multi echo outputs. The frame is COBS encoded, has a CRC16 checksum and uses 0x00 as a frame delimiter.

  • Page 25: Ahrs

    IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com 6.2 AHRS ID1: Impact Subsea heading, pitch, roll String format: $ISHPR,hhh.h,spp.p,srrr.r*xx<CR><LF> s = sign + or - hhh.h = heading in degrees (0 to 359.9) pp.p = pitch in degrees (90.0 to -90.0) rrr.r = roll in degrees (180.0 to -180.0)
  • Page 26 IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com ID4: Impact Subsea Accelerometer, Gyro, Magnetometer String format: $ISAGM,a.aaa,a.aaa,a.aaa,g.ggg,g.ggg,g.ggg,m.mmm,m.mmm,m.mmm*xx<CR><LF> a.aaa = Accelerometer reading: X then Y then Z g.ggg = Gyroscope reading: X then Y then Z m.mmm = magnetometer reading: X then Y then Z xx = NEMA standard checksum All values are floating point numbers.

  • Page 27: Theory Of Operation

    (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: Document No: 0000.1905 | Version No: 2.0 | 8...

  • Page 28: The Sonar Equation

    IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com Distance = Speed x Time = 1,500 x 0.1 = 150m Therefore, the total distance the sound has travelled is 1.5m (journey to the member back wall + journey back from the member back wall).

  • Page 29: Source Level (Sl)

    IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com 7.2.1 Source Level (SL) The Source level is the power at which the acoustic pulse is put into the water. A greater source level will increase the range capability; however, it will also increase the power consumption.

  • Page 30: 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 31: Heading, Pitch & Roll

    ISA500 end cap (the end with the connector). This reading can be used for reference, or to alter the speed of sound value used by the ISA500. As the temperature of the water will influence the speed of sound, it is important to adjust for this to enable accuracy of measurements to be maintained.

  • Page 32: Warranty

    Replacement or repair is at the discretion of Impact Subsea Ltd. How long does the coverage last? The Warranty Period for the ISA500, purchased from Impact Subsea Ltd, is 1 year from the date of dispatch from Impact Subsea Ltd.

  • Page 33: Technical Support

    IMPACT SUBSEA INNOVATIVE UNDERWATER PRODUCTS www.impactsubsea.com 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 An out of hours emergency number is available via the Impact Subsea website.

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