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miniSVS Sound Velocity Sensor

The Valeport miniSVS uses digital "time of flight" technology to provide the lowest noise, highest accuracy, best resolution sound velocity data available.

Small size and a choice of sensor lengths down to just 25mm make the sensor suitable for a variety of applications, and the optional pressure or temperature sensor adds versatility. There is a choice of data formats to allow an interface to pre-existing systems.

Valeport will also consider OEM and custom designs.


Support

miniSVS Datasheet
Download
miniSVS Operating Manual
Download
DataLog X2 Operating Manual
Download

Software

DataLog X2
1.1.0.1315
Download

Technical Specifications

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 a predictable performance under all conditions.

Range:
1375 - 1900m/s
Resolution:
0.001m/s
Accuracy:
Dependent on sensor size
Random noise (point to point) ±0.002m/s
Max systematic calibration error ±0.013m/s
Max systematic clock error ±0.002m/s
100mm
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

Sample Rate

Selectable, dependent on configuration

SV
Single Sample, 1Hz, 2Hz, 4Hz, 8Hz, 16Hz, 32Hz, 60Hz
SV+P
Single Sample, 1Hz, 2Hz, 4Hz, 8Hz, 16Hz, 32Hz
SV+T
Single Sample, 1Hz, 2Hz, 4Hz, 8Hz, 16Hz

Optional Pressure Sensor

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

Type
Strain Gauge
Range
5, 10, 50, 100 or 600 Bar
Resolution
0.001% range
Accuracy
±0.05% range

Optional Temperature Sensor

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

Type
PRT
Range
-5°C to +35°C
Resolution
0.001°C
Accuracy
±0.01°C

Data Output

The miniSVS 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:
9 - 28V DC
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)
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

Ordering

All systems supplied with operating manual and carry case. OEM units come with a test lead, housed units with a 0.5m pigtail.

Configuration 100mm
Titanium Housing 0652004
Bulkhead OEM 0652001
Remote OEM 0652007
Titanium + Pressure 0652004-P
Titanium + Temperature 0652004-T
Configuration 50mm
Titanium Housing 0652005
Bulkhead OEM 0652002
Remote OEM 0652008
Titanium + Pressure 0652005-P
Titanium + Temperature 0652005-T
Configuration 25mm
Titanium Housing 0652006
Bulkhead OEM 0652003
Remote OEM 0652009
Titanium + Pressure 0652006-P
Titanium + Temperature 0652006-T

Physical

Please refer to factory for detailed dimensions if required.

Depth Rating:
6000m (Titanium)
Weight:
1kg (housed type)
Housing & Bulkhead:
Titanium
Transducer Window:
Polycarbonate
Sensor Legs:
Carbon Composite
Reflector Plate:
Titanium

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