Idronaut Ocean Seven 303Plus Manuale utente

OCEAN SEVEN 303Plus CTD

MULTIPARAMETER PROBE

OCEAN SEVEN 303Plus CTD

MULTIPARAMETER PROBE

OPERATOR’S MANUAL

November 2019

OCEAN SEVEN and Idronaut are registered trademarks of Idronaut S.r.l.

Other products and services mentioned in this document are identified by the trademarks or service marks of their respective companies or

organizations. No part of this publication, or any software included with it, may be reproduced, stored in a retrieval system, or transmitted in

any form or by any means, including photocopying, electronic, mechanical, recording or otherwise, without the prior written permission of

the copyright holder. Idronaut S.r.l. provides this document as is without warranty of any kind either expressed or implied including, but not

limited to, the implied warranties of merchantability and fitness for a particular purpose. Idronaut S.r.l. may make changes of improvements

in the equipment, software, firmware, or specifications described in this document at any time and without notice. These changes may be

incorporated in new releases of this document. This document may contain technical inaccuracies or typographical errors. Idronaut S.r.l.

waives responsibility of any labour, materials, or costs incurred by any person or party as a result of using this document. Idronaut S.r.l. shall

not be liable for any damages (including, but not limited to, consequential, indirect or incidental, special damages, or loss of profits or data)

even if they were foreseeable and Idronaut S.r.l. has been informed of their potential occurrence arising out of or in connection with this

document or its use.

IDRONAUT –Brugherio (MB) OCEAN SEVEN 303Plus PROBE 02-2019

OCEAN SEVEN 303Plus PROBE

IMPORTANT REMARKS

CONDUCTIVITY MEASUREMENT

1) To obtain the best accuracy, the conductivity sensor and therefore the probe

sensor head, must be immersed in clean seawater for at least 15 minutes before

measurements. For fresh water application, the sensor does not require any

hydration.

2) When the conductivity sensor is not in use, it is kept dry. Therefore, when the

conductivity sensor is placed in water, very small bubbles may remain attached

to the platinum ring electrodes (seven). If such a thing happens, the measured

value of conductivity will be lower than the true one. To remove these air

bubbles, degrease the inside of the conductivity cell using cotton buds wetted

with the Conductivity Sensor Cleaning Solution or with liquid soap. Gently rotate

the cotton bud against the whole internal surface of the quartz cell. This will wet

the platinum electrodes thus reducing the surface tension of the cell and

considerably decreasing the risk of trapped air bubbles.

OXYGEN MEASUREMENT

Most polarographic oxygen sensors take 5 to 10 minutes after they have been

switched on to polarize and become stable. To overcome this limitation, the

IDRONAUT OS303 probe has been fitted with a small internal rechargeable battery,

to maintain polarization of the oxygen sensor continuously. However, if the probe is

not used for several months, the polarization battery may become completely

discharged resulting in damage to the battery. It is recommended that the probe

should be switched ON (and streaming real-time data) for at least a few hours every

2 to 3 months, to maintain this polarization battery in a healthy condition.

pH MEASUREMENT

The ph and reference sensors should never be allowed to completely dry out. For

short-term storage of up to one day, the probe’s sensor head can simply be

immersed in clean water. If the probe remains unused for periods longer than one

day, always place the hydrating caps on both sensors. The pH sensor cap should be

filled with the pH7 Buffer Solution (or simply with clean water). The reference sensor

cap should be filled with the Idronaut Reference Sensor Storage Solution (or even

with KCl saturated solution).

PROBE WASHING

After use, the probe must be always washed with fresh water in order to remove any

salt water residual or dirtiness.

IDRONAUT –Brugherio (MB) OCEAN SEVEN 303Plus PROBE 02-2019

LIFETIME AND HOW TO REPLACE THE IDRONAUT SENSORS

The Idronaut sensors are all pressure compensated and, in particular, the physical

sensors (pressure, temperature and conductivity) can last many years, if properly

used. They are high-quality sensors, as they are well known by oceanographers to

measure salinity with great accuracy.

The nitrate and ammonia sensors do not need to be removed and replaced when

they become exhausted with the passing of time or physically broken by pressure, if

the membrane cap has not been properly filled with (its specific) electrolyte. In fact, it

is enough to replace their specific membrane cap.

If thoroughly maintained by their respective hydrating caps and solutions, the

Idronaut pH and reference sensors can last several years. The sensor replacement

requires that the closure nuts on the top head of the probe be unscrewed with a

common screwdriver and the cylindrical housing be removed (this takes very few

minutes).The wire sensors are tin soldered on their respective connection points

placed on the printed circuit board.

All sensor heads have a standard 12 mm diameter and are provided with two o-rings

(Parker 2-12) for sealing.

This means that every sensor can be fitted in any of the five sensor head holes.The

pressure sensor is a high-quality transducer, which can last many years if properly

used. Its replacement is not very easy and, moreover, it requires a Dead Weight

Tester System to obtain the factory calibration accuracy of 0.05% full scale.

 
IDRONAUT –Brugherio (MB) OCEAN SEVEN 303Plus PROBE 02-2019 
TABLE OF CONTENTS 
 
 
1INTRODUCTION .................................................................................................................................. 1 
1 PROBE DESCRIPTION........................................................................................................................ 1 
2 Portable READER................................................................................................................................. 1 
3 FSK TELEMETRY - PORTABLE DECK UNIT ..................................................................................... 2 
4 PROBE MANAGEMENT PROGRAMMES........................................................................................... 2 
5 SENSOR SPECIFICATIONS................................................................................................................ 2 
6 OPTIONAL SENSORS......................................................................................................................... 4 
7 ELECTRONIC SPECIFICATIONS........................................................................................................ 4 
8 PHYSICAL CHARACTERISTICS......................................................................................................... 4 
9 CALCULATIONS .................................................................................................................................. 4 
9.1 Salinity .................................................................................................................................................. 4 
9.2 Density.................................................................................................................................................. 5 
9.3 Oxygen.................................................................................................................................................. 5 
9.4 pH calculation and pH correction in relation to the sample temperature.............................................. 7 
9.5 Conductivity compensated at 20oC...................................................................................................... 8 
9.6 Seawater sound speed......................................................................................................................... 8 
9.7 Pressure to depth conversion............................................................................................................. 10 
10 THE SENSORS .................................................................................................................................. 10 
10.1 Pressure transducer............................................................................................................................ 10 
10.2 Temperature sensor............................................................................................................................ 10 
10.3 The Idronaut seven-ring conductivity sensor...................................................................................... 11 
10.4 The Oxygen Sensor............................................................................................................................ 12 
10.5 pH and Reference sensors................................................................................................................ 14 
10.6 The redox sensor................................................................................................................................ 15 
2INSTALLATION AND START-UP....................................................................................................... 19 
1 SHIPPING LIST................................................................................................................................. 19 
2 INSTALLATION PROCEDURE .......................................................................................................... 19 
3 HOW TO OPERATE THE PROBE..................................................................................................... 19 
4 START-UP PROCEDURE.................................................................................................................. 19 
4.1 Probe Start-up -Verbose operating mode......................................................................................... 19 
4.2 Probe Start-up Non-Verbose operating mode.................................................................................... 20 
4.3 Telemetry Portable Deck Unit Start-up............................................................................................... 20 
5 The Probe Main Menu ........................................................................................................................ 21 
5.1 Operator Interface............................................................................................................................... 21 
3COMMANDS....................................................................................................................................... 23 
1 DATA ACQUISITION.......................................................................................................................... 23 
1.1 Real Time............................................................................................................................................ 23 
2 CALIBRATION.................................................................................................................................... 23 
2.1 Temperature sensor calibration.......................................................................................................... 24 
2.2 Pressure sensor calibration ................................................................................................................ 24 
2.3 Conductivity sensor calibration........................................................................................................... 25 
2.4 Oxygen Sensor Calibration................................................................................................................. 26 
2.5 pH Sensor Calibration........................................................................................................................ 27 
3 MEMORY MANAGEMENT................................................................................................................. 28 
4 SERVICE Menu .................................................................................................................................. 28 
4.1 Set-up ................................................................................................................................................. 28 
4.2 Advanced Set-up ................................................................................................................................ 30 
4.3 Real-Time Clock Set-up...................................................................................................................... 31 
4.4 Raw Counts ........................................................................................................................................ 31 
4.5 Raw mV .............................................................................................................................................. 31 
4.6 Rights.................................................................................................................................................. 32 
4.7 Firmware upgrading............................................................................................................................ 32 
5 SHUTDOWN....................................................................................................................................... 32 
6 CHANGE OPERATING MODE .......................................................................................................... 32 
4Probe MAINTENANCE...................................................................................................................... 33 
1 OXYGEN SENSOR ............................................................................................................................ 33 
1.1 Green membrane................................................................................................................................ 33 

 
IDRONAUT –Brugherio (MB) OCEAN SEVEN 303Plus PROBE 02-2019 
1.2 Refilling oxygen sensor cap with electrolyte....................................................................................... 34 
1.3 Membrane replacement (oxygen membrane cap).............................................................................. 34 
1.4 Replacement of membrane can be done using the OXYGEN SENSOR MAINTENANCE KIT:........ 34 
1.5 Oxygen sensor cleaning ..................................................................................................................... 36 
1.6 Oxygen sensor check in the absence of oxygen................................................................................ 36 
2 REFERENCE SENSOR...................................................................................................................... 36 
3 pH SENSOR ...................................................................................................................................... 37 
4 CONDUCTIVITY SENSOR................................................................................................................. 38 
4.1Conductivity sensor cleaning.............................................................................................................. 38 
4.2 Wetting the Conductivity sensor before laboratory calibration tests................................................... 38 
5 REDOX SENSOR............................................................................................................................... 38 
6 TEMPERATURE SENSOR ................................................................................................................ 39 
7 PRESSURE SENSOR........................................................................................................................ 39 
8 OXYGEN SENSOR POLARIZATION BATTERY............................................................................... 39 
8.1 RTC battery......................................................................................................................................... 39 
9 ROUTINE MAINTENANCE SCHEDULE............................................................................................ 39 
9.1 Monthly maintenance.......................................................................................................................... 39 
9.2 Quarterly maintenance........................................................................................................................ 39 
5ITERM –WINDOWS TERMINAL EMULATION PROGRAMME........................................................ 40 
1 DISTRIBUTED FILES......................................................................................................................... 40 
2 INSTALLATION .................................................................................................................................. 40 
3 PROGRAMME MENUS AND FUNCTIONS....................................................................................... 40 
4 TOOLBAR........................................................................................................................................... 43 
5 START-UP SWITCHES...................................................................................................................... 43 
6 TROUBLESHOOTING........................................................................................................................ 44 
6PTP COMMUNICATION PROTOCOL ............................................................................................... 44 
1 TIME-OUTS on command .................................................................................................................. 44 
2 ERROR/DIAGNOSTIC MESSAGES.................................................................................................. 44 
3 PACKET DESCRIPTION.................................................................................................................... 45 
7FSK - PORTABLE DECK UNIT.......................................................................................................... 46 
1 Probe checkout with the portable deck unit........................................................................................ 47 
2 Final checkout with the shipboard sea cable...................................................................................... 47 
3 FSK - TELEMETRY FINE TUNING.................................................................................................... 48 
APPENDIX A –HIGHLY PRECISE PRESSURE TRANSDUCER.................................................................. 50 
APPENDIX B - STANDARD SEA WATER TABLE……………………………………………………………..... 52 
 
 
 
 

SECTION ONE - INTRODUCTION

IDRONAUT –Brugherio (MB) OCEAN SEVEN 303Plus PROBE 02-2019

1 INTRODUCTION

This section describes the main components of the OCEAN SEVEN 303Plus CTD multiparameter

probe.

1.1 PROBE DESCRIPTION

The OCEAN SEVEN 303Plus multiparameter CTD probe, is the result

of Idronaut’s 20 years experience in the design and manufacture of

high quality fast response marine instrumentation. It offers a

combination of 16-bit high resolution data accuracy, with long-term

sensor stability, making this probe an ideal choice for on-line profiling.

The OCEAN SEVEN 303Plus probe does not require a pump or any

other external device to flush the sensors.

The OCEAN SEVEN 303Plus PROBE in the standard configuration is

equipped with seven sensors to measure: Pressure, Temperature,

Conductivity, Dissolved Oxygen, pH, Reference, Oxidation-reduction

potential (REDOX). Salinity is automatically calculated from

conductivity, temperature and pressure sensor signals.

The slim line of the probe and the pressure-compensation of sensors

permit operation in fast water profiling or in fixed depth monitoring

down to 1500 metres depth. The response time constant is 50 msec.

for all parameters except for oxygen, pH and Redox, which have a 3

sec. time constant. The electronic boards are fitted in an AISI 316

stainless steel sealed housing; one oceanographic connector, located

on the top cover, provides the probe power supply and data exchange

with a suitable external device. On the opposite end, the sensor area

is protected against accidental bumps with an AISI 316 stainless steel

protective cage.

The OCEAN SEVEN 303Plus PROBE is microprocessor-controlled and can measure and transmit

sensor data through a shielded coaxial cable via telemetry. Thanks to the high speed data conversion

and acquisition, micro-profiles can be easily obtained. The user can interface the probe with an

asynchronous terminal, or a Personal Computer equipped with a terminal emulation programme.

When using the telemetry, an additional deck unit is required to convert serial, RS232C type signals

(coming from a PC communication port) into telemetry signals (and vice versa) which flow

superimposed on the probe power supply along the probe cable. OEM Version of the probe are

available upon request with RS232C or 5V TTL interfaces.

The probe is operated through commands, which are selected from a list, or a menu, of possible

choices. Parallel to the menu interface, a computer-oriented interface has been implemented,

allowing the execution of the same commands to be performed in a quick and efficient (from

a Computer’s point of view) way.

Those customers who plan to make use of the computer-oriented interface will find it helpful to look at

the REDAS programme which can be supplied with the OCEAN SEVEN 303Plus PROBE. The

programme allows the user to collect and save data in real-time.

1.2 PORTABLE READER

The OCEAN SEVEN 303Plus CTD equipped with

the FSK-Telemetry portable deck unit can be

interfaced with a portable lightweight and

extremely rugged reader based on a high-

performance Intel® XScale™ processor and on

the Windows Mobile™ software for Pocket PC.

Through this device, it is possible to perform the

operations usually performed by means of a

portable personal computer, but without all

limitations that the use of a portable computer in

the field and in hostile environments normally

implies, like: battery endurance, display reading

SECTION ONE - INTRODUCTION

IDRONAUT –Brugherio (MB) OCEAN SEVEN 303Plus PROBE 02-2019

under sunlight, water and dust tightness, weight, etc. The “Portable Reader” interfaces the OCEAN

SEVEN 303Plus probe through a built-in RS232-C interface and a dedicated terminal emulation

programme, specifically developed for the Windows Pocket PC operating system. This programme

interfaces the OCEAN SEVEN 303Plus probe and allows the operator to dialogue with the probes

directly thus performing: sensor calibration, data acquisition, probe configuration, etc. All these

operations are possible thanks to the OCEAN SEVEN 303Plus probe smartness included in the

management firmware. Furthermore, the “Portable Reader” not only shows in real time data sent by

the OS 303Plus probe, but also stores it. Data is stored in text files using the “Portable Reader” main

or extension “Flash” memory, which can be later transferred to a desktop personal computer using the

Microsoft ActiveSync programme. Data storage capability of the “Portable Reader” is limited only by

the size of the installed “Flash” Compact memory card. The “Portable Reader” can operate for up to 15

hours continuously. Autonomy of the interfaced OCEAN SEVEN 303Plus probe depends on the

battery of the PORTABLE DECK UNIT.

1.3 FSK TELEMETRY - PORTABLE DECK UNIT

The PORTABLE DECK UNIT powers and interfaces, by

coaxial oceanographic cables, the CTD with a personal

computer RS232C. The deck unit is provided with a

transceiver (modem) which allows half-duplex

communication with the probe. The unit is provided with an

internal mains rechargeable lead battery (12V DC, 7 A/h)

which permits probe operation even in the absence of the

mains supply and guarantees up to 50 hours of continuous

probe and deck unit operation. Telemetry power supply: 30

V DC (max 0.3A@12 V). Dimensions: 340 x 300 x 160 mm.

Weight: 6.5 kg.

1.4 PROBE MANAGEMENT PROGRAMMES

IDRONAUT programmes designed for the Windows 98se/ME/2000/XP operating systems allow the

operator to communicate with the OCEAN SEVEN 303Plus CTD multiparameter probe to perform

attended or unattended data acquisitions. The programme packages comprise:

ITERM: IDRONAUT Terminal Emulation Programme and Probe Management Programme to easily

communicate with the OCEAN SEVEN 303Plus CTD multiparameter probe. Diagnostic and

dedicated functions are included.

REDAS:Real-time data acquisition, processing and presentation programme which allows the

numerical display and plotting of the standard sensors and the derived variables such as

salinity, sound speed, density, according to UNESCO formulas and recommendations.

1.5 SENSOR SPECIFICATIONS

The OCEAN SEVEN 303Plus CTD multiparameter probe can be equipped with the following

IDRONAUT sensors to measure:

Parameter Range Accuracy Resolution Time Constant

Pressure 0..1000 dbar(3) 0.05 % F.S. 0.0015 % F.S. 50 ms

Temperature -1.. +50 °C 0.005 °C 0.001 °C 50 ms

Conductivity

Salt water 0.. 70 mS/cm 0.007 mS/cm 0.001 mS/cm 50 ms (1)

Fresh water 0..7000 µS/cm 5 µS/cm 0.1 µS/cm 50 ms (1)

Oxygen 0.. 50 ppm 0.1 ppm 0.01 ppm 3 s (2)

0.. 500 %sat. 1 % sat. 0.1 % sat. 3 s (2)

pH 0..14 pH 0.01 pH 0.001 pH 3 s

Redox +/-1000 mV 1 mV 0.1 mV 3 s

SECTION ONE - INTRODUCTION

IDRONAUT –Brugherio (MB) OCEAN SEVEN 303Plus PROBE 02-2019

(1) At 1 m/second flow rate.

(2) In air.

(3) Other standard pressure transducers available have 10, 40, 100, 200, 500, 2000, 3000 dbar

ranges.

The following parameters are calculated from CTD sensors signals:

▪SALINITY, SOUND SPEED, SIGMA-T (according to UNESCO 1978 formula);

▪FRESH WATER CONDUCTIVITY corrected at 20°C and at 25°C;

▪OXYGEN % SATURATION to OXYGEN ppm CONVERSION (according to UNESCO 1986 formula -

Millero).

SECTION ONE - INTRODUCTION

IDRONAUT –Brugherio (MB) OCEAN SEVEN 303Plus PROBE 02-2019

1.6 OPTIONAL SENSORS

The OCEAN SEVEN 303Plus CTD can be optionally equipped with the Highly Precise (0.01%)

Pressure Sensor and the ION selective electrodes: ammonia, nitrate and chloride.

Parameter Range Accuracy Resolution Time Constant

Pressure 0..4000 dbar 0.01% F.S. 0.002 % F.S. 50 ms

Ammonia 0..100 mg/l-N 0.1 mV

Nitrate 0..100 mg/l-N 0.1 mV

Chloride 0.5..18000 mg/l-N 0.1 mV

1.7 ELECTRONIC SPECIFICATIONS

Real-time data output rate: 8 Hz (conversion into engineering units takes place using the probe

internal resources), 12 Hz using REDAS software.

Communication: Telemetry, RS232C, Asynchronous TTL (0..5VDC).

Baud Rate: 9600 bps.

Protocol: [Verbose] friendly operator interface with built-in help.

[Non Verbose] binary and/or ASCII data transmission.

A/D converter: 16-bit, resolution, range 0..2.5 VDC, 12 multiplexed analogue inputs.

Supply Voltage: 9..30 VDC, nominal 12 VDC.

Supply Current: 50 mA @ 12 V DC.

Cable: The OCEAN SEVEN 303Plus CTD multiparameter probe operates

with the standard Rochester coaxial armoured cables (1/10, 1/8, 1/4,

inch) and with sea cables having a total resistance up to 250 ohms.

1.8 PHYSICAL CHARACTERISTICS

Housing: 150 bar (AISI 316L) 300 bar (Titanium grade 2)

Dimensions:

housing diameter 43 mm 48 mm

total length 700 mm 705 mm

Weight: in air 1.6 kg 3.7 kg

in water 0.8 kg 2.8 kg

1.9 CALCULATIONS

Unless otherwise specified, the computation of algorithms is taken from UNESCO technical papers in

the marine science document no. 44 "Algorithms for computations of fundamental properties of

seawater" 1983.The shown algorithms are written in ANSI "C" language.

1.9.1 Salinity

The formula used for this calculation is as defined by UNESCO 1978 and successive modifications.

RT35(xt) = (((1.0031e-9*xt-6.9698e-7)*xt+1.104259e-4)*xt+2.00564e-2)*xt+0.6766097

SAL(xr,xt) = ((((2.7081*xr-7.0261)*xr+14.0941)*xr+25.3851)*xr-0.1692)*xr+0.0080

+(xt/ (1.0+0.0162*xt))*(((((-0.0144*xr+0.0636)*xr-0.0375)*xr-0.0066)

* xr - 0.0056) * xr + 0.0005)

C(xp) = ((3.989e-15 * xp - 6.370e-10) * xp + 2.07e-5) * xp

B(xt) = (4.464e-4 * xt + 3.426e-2) * xt + 1.0

A(xt) = -3.107e-3 * xt + 0.4215

CND = Conductivity / 42.91400391

RT = CND / (RT35(T) * (1.0 + C(P) / (B(T) + A(T) * CND)))

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