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MIDAS - Model UV-SVP -Sound Velocity Profiler
The MIDAS SVP is the new name for Valeport`s renowned Model 650 Mk2 Sound Velocity Profiler, and it gives the most accurate Sound Velocity Profiles currently possible. As well as using the world leading digital time of flight sound speed sensor, this instrument also 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. Titanium construction and a large memory make it suitable for rapid profiling down to 6000m depth.
Sensors
- The miniSVP is fitted with Valeport’s digital time of flight sound velocity sensor, a PRT temperature sensor, and strain gauge pressure transducer.
Sound Velocity
- Range: 1375 - 1900m/s
- Resolution: 0.001m/s
- Accuracy : ±0.02m/s
Temperature
- Range: -5°C to +35°C
- Resolution: 0.001°C
- Accuracy: ±0.01°C
Pressure
- Range: 5, 10, 30, 50, 100, 300 or 600 Bar
- Resolution: 0.001% range
- Accuracy: ±0.05% range
Data Acquisition
- The miniSVP features a selection of pre-programmed sampling regimes, covering many standard applications. Data may be sampled from 1 to 16Hz, making it suitable for rapid profiling or for continuous measurement at a fixed point
Sampling Modes
- Continuous: Regular output from all sensors at 1, 2, 4, 8, 16Hz.
- Profile: Logs data as the device falls (or rises) by a defined amount through the water column.
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 fitted as standard and selected by pin choice on the output connector:
- RS232: Up to 200m cable, direct to serial port
- RS485: Up to 1000m cable
- Baud Rate: 4800 - 460800
- Protocol: 8 data bits, 1 stop bit, No parity, No flow control
- Bluetooth: Bluetooth logger and communication set available for cable free data recovery (500m rated)
Memory
The miniSVP is fitted with a solid state non-volatile Flash memory, capable of storing over 10 million lines of data (equivalent to 10,000 profiles to 500m, at 1m profile resolution).
Electrical
- Internal: 1 x C cell, 1.5v alkaline or 3.6v lithium
- External: 9 - 28vDC
- Power: <250mW
- Battery Life: approx 30 hours operation (alkaline), approx 90 hours operation (lithium)
- Connector: Subconn MCBH10F
Physical
- Materials: Acetal or titanium housing (as ordered), polycarbonate & composite sensor components, stainless steel (316) deployment cage
- Depth Rating: 500m (acetal) and 6000m (titanium)
- NB: Maximum deployment depth may be limited by transducer range
- Instrument Size: Main Housing 48mmØ
- Sensor Body 54mmØ
- Length 435mm (including connector)
- Deployment Cage: 110mmØ x 450mm long
- Weight: 0.8kg (acetal)
- 1.6kg (titanium)
- Shipping: 51 x 42 x 27cm, 10kg
Software
- System is supplied with DataLog Express Windows based PC software, for instrument setup, data extraction and display. DataLog Express is license free.