Valeport MiniSVS - Sound Velocity Sensors & Profilers

Sound Velocity Measurement
Each sound velocity measurement is made using a single pulse of sound travelling over a known distance, so is independent of the inherent calculation errors present in all CTDs. Our unique digital signal processing technique virtually eliminates signal noise, and gives almost instantaneous response; the digital measurement is also entirely linear, giving predictable performance under all conditions.

• Range: 1375 - 1900m/s
• Resolution: 0.001m/s
• Accuracy: Dependent on sensor size
• 100mm Random noise (point to point) ±0.002m/s
• Max systematic calibration error ±0.013m/s
• Max systematic clock error ±0.002m/s
• Total max theoretical error ±0.017m/s
• 50mm Total max theoretical error ±0.019m/s
• 25mm Total max theoretical error ±0.020m/s
• Acoustic Frequency: 2.5MHz

Optional Sensors The miniSVS may be optionally supplied with either a pressure or temperature sensor (but not both). Data is sampled at the rates shown above

Data Output
Unit has RS232 & RS485 output, selected by command code. RS232 data may be taken directly into a PC over cables up to 200m long, whereas RS485 is suitable for longer cables (up to 1000m) and allows for multiple addressed units on a single cable.

• Baud Rate: 2400 - 115200 (NB. Low baud rates may limit data rate)
• Protocol: 8 data bits, 1 stop bit, No parity, No flow control

Electrical

• Voltage: 8 - 30vDC
• Power: 0.25W (SV only), 0.35W (SV + Pressure)
• Connector: Subconn MCBH6F (alternatives on request)

Data Format

• Examples of data formats are:
• {sound_velocity}
• {pressure}{sound_velocity}
• {temperature}{sound_velocity}

• SV: Choose from mm/s (1510123), m/s to 3 decimal places (1510.123), or m/s to 2 decimal places (1510.12)
• Pressure: If fitted, pressure is always output in dBar with 5 digits, with a decimal point, including leading zeroes if necessary. Position of the point is dependent on sensor range, e.g.
• 50dBar 47.123
• 100dBar 047.12
• 1000dBar 0047.1
• Temperature: If fitted, temperature is output as a 5 digit number with 3 decimal places and leading zeroes, signed if negative, e.g. 21.456
• 02.298
• -03.174

Physical

• Please refer to factory for detailed dimensions if required.
• Depth Rating: 6000m (Titanium), 500m (acetal)
• Weight: 1kg (housed type)
• Housing & Bulkhead: Titanium or acetal, as selected
• Transducer Window: Polycarbonate
• Sensor Legs: Carbon Composite
• Reflector Plate: Titanium.