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MIDAS SVX2

Some users need the superior Sound Velocity data from an SVP with the Salinity and Density data from a CTD. So Valeport has come up with the unique MIDAS SVX2 that combines both technologies to give the best of both worlds.

Now fitted with a 0.01% pressure sensor as standard, the SVX2 also uses synchronised sampling to ensure perfect profiles, and since the digital time of flight SV sensor is the most accurate in the world, it’s also possible to compare the true sound velocity data with that generated by commonly used equations.

 

 


Support

MIDAS SVX2 Datasheet
MIDAS SVX2 Operating Manual
DataLog X2 Operating Manual
DataLog Express Operating Manual

Software

DataLog X2
1.1.0.1315
DataLog Express
l1

Technical Specifications

Sensors

Fitted with Valeport’s digital sound velocity sensor, high stability conductivity sensor, high accuracy temperature compensated piezo-resistive pressure transducer, and fast response PRT temperature sensor.

Sound Velocity

Range:
1375 – 1900m/s
Resolution:
0.001m/s
Accuracy:
±0.02m/s

Conductivity

Range:
0 - 80mS/cm
Resolution:
0.003mS/cm
Accuracy:
±0.01mS/cm

Temperature

Range:
-5°C - +35°C
Resolution:
0.005°C
Accuracy:
±0.01°C

Pressure

Range:
10, 20, 30, 50, 100, 200, 300, 400 or 600 Bar
Resolution:
0.001% range
Accuracy:
±0.01% range

Data Acquisition

Using the concept of distributed processing each sensor has its own microprocessor controlling sampling and calibration. Each is controlled by a central processor that issues global commands and handles all data. Consequently all data is sampled at precisely the same instant, giving superior quality profile data.

Sampling Modes

Continuous:
Regular output from all sensors at 1, 2, 4 or 8Hz.
Burst:
Regular sampling pattern: regular number of readings taken, then sleeps for a defined time.
Trip/Profile:
Data is output as a chosen parameter changes by a set value, usually Pressure for profiling.
Conditional:
Instrument sleeps until a selected parameter reaches a set value.
Delay:
Instrument sleeps until predefined start time

Electrical

Internal:
8x C cells, 1.5V alkaline or 3.6V lithium
External:
9 – 28V DC
Power:
0.7W(sampling), <1mW(sleeping)
Battery Life:
<100 hrs (alkaline) | <250 hrs (lithium)
Connector:
SubConn Titanium MCBH10F

Software

System is supplied with DataLog X2 Windows based PC software, for instrument setup, data extraction and display. DataLog X2 is licence free.

Communications

The instrument will operate autonomously, with setup and data extraction performed by direct communications with PC before and after deployment. It also operates in real time, with a choice of communication protocols for a variety of cable lengths, all fitted as standard and selected by pin choice on the output connector:

Standard

RS232
< 200m cable, direct to serial port (USB adapter)
RS485
< 1000m cable, addressable half duplex

Optional FSK

2 wire power and comms up to 6000m of cable (cable dependent)

Baud Rate:
2400 - 115200 (FSK fixed at 19200, USB 460800)
Protocol:
8 data bits, 1 stop bit, No parity, No flow control

Memory

Fitted with 16Mb solid state non-volatile FLASH memory. Total capacity depends on sampling mode; continuous & burst modes have a single time stamp at the start of the file, trip mode (profiling) stores a time stamp with each reading.

Continuous:
>1,600,000 data points
Profile:
>980,000 data points (>80 profiles to 6000m)

Physical

Materials:
Titanium housing, polycarbonate & composite sensor components, stainless steel (316) cage
Depth Rating:
6000m (may be limited by pressure sensor)
Instrument Size:
88mmØ x 665mm long
Cage Size:
750 x 140 x 120mm
Weight:
11.5kg (in air), 8.5kg (in water) including cage
Shipping:
100 x 18 x 49cm, 24kg

Ordering

0650010-XX
MIDAS SVX2 Profiler
Supplied with:
· Deployment cage
· SubConn switch plug
· 3m communications lead
· Tool kit and DataLog x2 software
0650010-XX-FSK
Midas SVX2 with FSK option
Note:
XX denotes transducer range.
Select from 10, 20, 30, 50, 100, 200, 300, 400 or 600 Bar
0400002
16Mbyte memory upgrade (max 64Mbyte)

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