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.
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.
1375 – 1900m/s
0 - 80mS/cm
-5°C - +35°C
10, 20, 30, 50, 100, 200, 300, 400 or 600 Bar
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.
Regular output from all sensors at 1, 2, 4 or 8Hz.
Regular sampling pattern: regular number of readings taken, then sleeps for a defined time.
Data is output as a chosen parameter changes by a set value, usually Pressure for profiling.
Instrument sleeps until a selected parameter reaches a set value.
Instrument sleeps until predefined start time
8x C cells, 1.5V alkaline or 3.6V lithium
9 – 28V DC
<100 hrs (alkaline) | <250 hrs (lithium)
SubConn Titanium MCBH10F
System is supplied with DataLog X2 Windows based PC software, for instrument setup, data extraction and display. DataLog X2 is licence free.
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:
< 200m cable, direct to serial port (USB adapter)
< 1000m cable, addressable half duplex
2 wire power and comms up to 6000m of cable (cable dependent)
2400 - 115200 (FSK fixed at 19200, USB 460800)
8 data bits, 1 stop bit, No parity, No flow control
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.