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MIDAS SVX2 Combined SV and CT Profiler -
Document ID
MANUAL-1553401442-1 issue: 1.5
Date:
March 2022
This confidential document was prepared by the staff of Valeport Limited, the Company, and is the
property of the Company, which also owns the copyright therein. All rights conferred by the law of
the copyright and by virtue of international copyright conventions are reserved to the Company.
This document must not be copied, reprinted or reproduced in any material form, either wholly or in
part, and the contents of this document, and any method or technique available there from, must
not be disclosed to any other person whatsoever without the prior written consent of the Company.
© 2022 Valeport Ltd
Valeport Ltd
St Peter's Quay
Totnes TQ9 5EW
United Kingdom
As part of our policy of continuous development, we reserve the right to alter, without prior notice,
all specifications, designs, prices and conditions of supply for all our equipment
Operating Manual
Phone:
+44 1803 869292
email:
sales@valeport.co.uk
Web:
www.valeport.co.uk
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Summary of Contents for Valeport MIDAS SVX2
- Page 1 Date: March 2022 This confidential document was prepared by the staff of Valeport Limited, the Company, and is the property of the Company, which also owns the copyright therein. All rights conferred by the law of the copyright and by virtue of international copyright conventions are reserved to the Company.
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Page 2: Table Of Contents
2.4.1 Based on Memory ......................6 2.4.2 Based on Batteries ......................8 Installation ..........................10 Communications With a PC....................10 Deploying the MIDAS SVX2 ....................10 3.2.1 Real Time Operation...................... 10 3.2.2 Self Recording Operation ....................11 3.2.3 LED Flashing Sequence ....................11 3.2.4 Real Time Data Formats .................... -
Page 3: Introduction
This manual covers the specification, wiring details and basic maintenance procedures for the Valeport MIDAS SVX2 Combined SVP / CTD Profiler. Full details of how to operate the instrument with DataLog x2 software supplied are given in a separate manual. -
Page 4: Specifications
Section 2 | Specifications 2 Specifications 2.1 Sensor Specifications The unit is fitted with the following sensors: 2.1.1 Sound Velocity Type: Valeport “time of flight” sound velocity sensor Range: 1375 to 1900m/s standard. Accuracy: ± 0.02m/s Resolution: 0.001m/s 2.1.2 Conductivity... -
Page 5: Mechanical Specifications
10 pin female SubConn bulkhead type (MCBH10F) with lock ring. Comms Cable: Valeport 3m Y lead. 10 pin male SubConn line type (MCIL10M) to instrument, 2x 4mm bunch pins to external power, 9 pin female D type to PC. Switch Plug: 10 pin male SubConn line type (MCIL10M), with lock ring. -
Page 6: Dimensions
Section 2 | Specifications 2.2.3 Dimensions © 2022 – Valeport Ltd Page | 4... -
Page 7: Performance Specifications
MIDAS SVX2 Combined SV and CT Profiler - Operating Manual MANUAL-1553401442-1 | issue: 1.5 2.2.3.1 Pressure Sensor Offsets 2.3 Performance Specifications Memory: 16Mb solid state memory (upgradeable in 16Mb steps to 64Mb) Internal Power: 8 x 1.5v alkaline C cells. The unit will accept 8 x 3.6v Lithium C cells with no... -
Page 8: Sample Battery Life Calculations
7 bytes of time stamp. Each record therefore uses 17 bytes. A single cast will take 12,000 such records, and will therefore use 204,000 bytes. The 16Mbyte memory will therefore hold approximately 82 casts of data. © 2022 – Valeport Ltd Page | 6... - Page 9 MIDAS SVX2 Combined SV and CT Profiler - Operating Manual MANUAL-1553401442-1 | issue: 1.5 2.4.1.1 A Note About Removable Memory We are sometimes asked whether we offer these devices with removable memory. The answer is no we don’t, but there are sound reasons for this. It is natural to think that since removable memory cards are now the norm in consumer electronics, they must be “state of the art”...
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Page 10: Based On Batteries
2.4.2 Based on Batteries The MIDAS SVX2 will function with a voltage supply of between 9 and 30vDC. The voltage output of the 8 x C cell battery pack will vary according to the type of cell fitted. The most likely cells to be used will be standard alkaline type (1.5v each) or Lithium cells (3.6v each), giving a 12v nominal... - Page 11 They are also considerably more expensive. Technology is constantly changing and battery technology, in particular, is at the forefront of development. As new battery chemistries become available Valeport will advise on a case by case basis. Page | 9...
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Page 12: Installation
PC as possible. The MIDAS SVX2 is supplied with a stainless steel protective cage, but care should still be taken not to damage the instrument. For profiling work, the recommended deployment method is to suspend the instrument using the stainless steel wire strop fixed to the top of the cage. -
Page 13: Self Recording Operation
Section 5, which are used to turn the instrument on. 3.2.3 LED Flashing Sequence The MIDAS SVX2 is fitted with an LED visible through a polycarbonate window in the battery pack. The LED will flash as detailed below to indicate various states. -
Page 14: Data Download
Check instrument for signs of damage. • Rinse the instrument in fresh water • Dry the instrument if possible, paying particular attention to the sensors and connector. • Repack the instrument in the transit case provided. © 2022 – Valeport Ltd Page | 12... -
Page 15: Maintenance
4.1.1 Removing the End Cap Safely 4.1 Changing Batteries The MIDAS SVX2 accepts 8 x C cells, of either 1.5v alkaline or 3.6v Lithium type. These cells are arranged in series, so the output voltage is 12v (alkaline) or 28.8v (Lithium). Some example scenarios for lifetime of these batteries are given in Chapter 2.4.2... -
Page 16: Removing The End Cap Safely
Once the cap is free from the housing you can remove the safety bolt 4.2 Seals The MIDAS SVX2 is kept watertight by using o-ring seals and anti-extrusion rings. Double o-ring seals are used at each end of the titanium housing, although the customer should have no reason to open any seal other than that at the battery end. -
Page 17: O-Rings
Ensure that all o-ring protected seals are tightened. 4.2.2 Anti-Extrusion Rings It is common Valeport practice to fit Anti-Extrusion Rings, also known as AE Rings or Backing Rings, to o-ring seals on deep water instrumentation. The function of an AE Ring is to prevent the o-ring from being squeezed out of its groove under high pressure. -
Page 18: Wiring Information
Function SubConn Plugs BLUE BLACK Power Ground BROWN Power +V RS232 Tx (To PC) RS232 Rx (From PC) 5 (link to 1,6,8,9) RS232 Ground SHELL Internal Battery Enable Link to RS232 Ground © 2022 – Valeport Ltd Page | 16... -
Page 19: Switched Y Lead (Rs485)
MIDAS SVX2 Combined SV and CT Profiler - Operating Manual MANUAL-1553401442-1 | issue: 1.5 5.3 3m Switched Y Lead (RS485) 10 Way Male 1m White 4mm Banana 15 Way D 9 Way D Function SubConn Cable Plugs Type Type BLUE... -
Page 20: Frequently Asked Questions
Why is the SV data from the time of flight sensor different from the CTD data? Quite simply, the Valeport SV sensor is more accurate than the CTD data. This is because the CTD formulae (Chen & Millero, Del Grosso etc.) all have errors in them – they were after all based on observed data taken over 30 years ago using the best technology available at the time. - Page 21 MIDAS SVX2 Combined SV and CT Profiler - Operating Manual MANUAL-1553401442-1 | issue: 1.5 I've Fixed it to my ROV and I'm Getting Strange Readings - Why? There are three possible causes of this. Firstly, check that nothing else on the ROV is physically interfering with the conductivity sensor, for example a cable lying across the cell.
- Page 22 This will normally wash off during the up-cast. It can also happen if the sensor has been deployed for some time without cleaning, and there is significant growth on the sensor. © 2022 – Valeport Ltd Page | 20...
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Page 23: Eu Declaration Of Conformity - Ce Marking
Please note: Any changes or modifications to the product or accessories supplied, that are not authorised by Valeport Ltd, could void the CE compliance of the product and negate your authority to operate it. This product has demonstrated CE compliance under conditions that include the use of shielded cables.
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