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MIDAS SVP

Suitable for rapid profiling down to 6000m depth, the MIDAS SVP gives the most accurate Sound Velocity Profiles currently possible.

Replacing Valeport’s renowned Model 650 Mk2 Sound Velocity Profiler, it features titanium construction and a large memory. As well as using the world leading digital time of flight sound speed sensor, the instrument has a ±0.01% pressure sensor, and features Valeport’s synchronised sampling technique to guarantee that all sensors are sampled at exactly the same point during a profile.

Support

MIDAS SVP Datasheet
MIDAS SVP Operating Manual
DataLog X2 Operating Manual

Software

DataLog X2
1.1.0.1315

Technical Specifications

Sensors

The MIDAS SVP is fitted with Valeport’s digital time of flight sound velocity sensor, a high accuracy temperature compensated piezo-resistive pressure transducer, and a fast response PRT temperature sensor.

Sound Velocity

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

Temperature

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

Pressure

Range:
10, 50, 100, 300 or 600bar
Resolution:
0.001% range
Accuracy:
±0.01% range

Data Acquisition

The MIDAS SVP uses the concept of distributed processing, where each sensor has its own microprocessor controlling sampling and calibration of readings. Each of these is then controlled by a central processor, which issues global commands and handles all the data. This means that 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, where instrument takes a
number of readings, 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

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
Up to 200m cable, direct to serial port via USB adaptor
RS485
Up to 1000m cable, addressable half duplex comms

Optional FSK

2 wire power & comms up to 6000m of cable (cable dependant)

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

Memory

The MIDAS SVP is 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. A single line of SVP data uses 8 bytes, and a time stamp uses 7 bytes.

Continuous:
>2,000,000 data points
Profile:
>1,000,000 data points (>100 profiles to 6000m)

Electrical

Internal:
8 x C cells, 1.5V alkaline or 3.6V lithium
External:
9 – 30V DC
Power:
0.6W (sampling), <1mW (sleeping)
Battery Life:
<100 hours operation (alkaline)
<250 hours operation (lithium)
Connector:
SubConn Titanium MCBH10F

Physical

Materials:
Titanium housing, polyurethane & carbon composite
sensor components, stainless steel (316) deployment 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

Software

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

Ordering

0650003-XX
MIDAS SVP Profiler
Supplied with:
· Deployment cage
· SubConn switch plug
· 3m Communications Lead
· USB adapter
· DataLog x2 software
· Manual, tool kit and transit case.
Note:
XX denotes transducer range
Select from 10, 50, 100, 300 and 600bar.
0400002
16 Mbyte memory upgrade (max 64 Mbyte)
0400EA5
FSK modem adapter
TB0400FSK
Probe board set required for FSK operation

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