Valeport Mini SVS – SPEED Sound Velocity Sensor

Description

The Valeport miniSVS is a sound velocity sensor that uses digital time of flight technology. Each sound velocity measurement is made with a single pulse of sound travelling over a known distance, at an acoustic frequency of 2.5 MHz. The miniSVS is titanium housed as standard and rated to 6000 m.

The Valeport miniSVS measures sound velocity over 1375–1900 m/s. Accuracy depends on sensor size: the 100 mm sensor has ±0.002 m/s random noise, ±0.013 m/s max systematic calibration error, ±0.002 m/s max systematic clock error and ±0.017 m/s total max theoretical error, while the total max theoretical error is ±0.019 m/s for the 50 mm sensor and ±0.020 m/s for the 25 mm sensor. Sample rate is selectable from single sample up to 32 Hz, or up to 60 Hz for sound velocity only.

The miniSVS can optionally be supplied with either a strain gauge pressure sensor (2, 5, 10, 20, 30, 50, 100, 300 or 600 bar, ±0.05 % range accuracy) or a PRT temperature sensor (−5 to +35 °C, 0.001 °C resolution, ±0.01 °C accuracy). Output is RS232 or RS485, selected by command code, at 2400–115200 baud. RS232 data can be taken directly into a PC over cables up to 200 m, and RS485 supports cables up to 1000 m and multiple addressed units on a single cable.

The sensor runs on 9–28 V DC and draws 0.25 W (SV only) or 0.35 W (SV + pressure), with a SubConn MCBH6F connector (alternatives on request). The housed type weighs 1 kg and has a titanium housing, bulkhead and reflector plate, a polycarbonate transducer window and carbon composite sensor legs. All systems are supplied with an operating manual and carry case; housed units come with a 0.5 m pigtail and OEM units with a test lead.

Technical Specification

Measurement principle

Digital time of flight, single pulse over a known distance

Acoustic frequency

2.5 MHz

Sound velocity range

1375–1900 m/s

Accuracy (100 mm sensor)

Random noise (point to point) ±0.002 m/s; max systematic calibration error ±0.013 m/s; max systematic clock error ±0.002 m/s; total max theoretical error ±0.017 m/s

Accuracy (50 mm sensor)

Total max theoretical error ±0.019 m/s

Accuracy (25 mm sensor)

Total max theoretical error ±0.020 m/s

Sample rate (SV)

Single sample, 1, 2, 4, 8, 16, 32, 60 Hz

Sample rate (SV + pressure, SV + temperature)

Single sample, 1, 2, 4, 8, 16, 32 Hz

Pressure sensor (optional)

Strain gauge; 2, 5, 10, 20, 30, 50, 100, 300 or 600 bar; accuracy ±0.05 % range

Temperature sensor (optional)

PRT; −5 to +35 °C; resolution 0.001 °C; accuracy ±0.01 °C

Data output

RS232 & RS485, selected by command code

Cable length

RS232: up to 200 m; RS485: up to 1000 m, multiple addressed units on a single cable

Baud rate

2400–115200 (low baud rates may limit data rate)

Protocol

8 data bits, 1 stop bit, no parity, no flow control

SV output format

mm/s (1510123), m/s to 3 decimal places (1510.123) or m/s to 2 decimal places (1510.12)

Pressure output format

dBar, 5 digits with decimal point; position of point depends on sensor range

Temperature output format

5 digits, 3 decimal places, leading zeros, signed if negative

Voltage

9–28 V DC

Power

0.25 W (SV only); 0.35 W (SV + pressure)

Connector

SubConn MCBH6F (alternatives on request)

Depth rating

6000 m (titanium)

Weight

1 kg (housed type)

Housing and bulkhead

Titanium

Transducer window

Polycarbonate

Sensor legs

Carbon composite

Reflector plate

Titanium

Supplied with

Operating manual and carry case; housed units: 0.5 m pigtail; OEM units: test lead

Part numbers, titanium housing

0652004 (100 mm), 0652005 (50 mm), 0652006 (25 mm)

Part numbers, bulkhead OEM

0652001 (100 mm), 0652002 (50 mm), 0652003 (25 mm)

Part numbers, remote OEM

0652007 (100 mm), 0652008 (50 mm), 0652009 (25 mm)

Part numbers, titanium + pressure

0652004-P-XX, 0652005-P-XX, 0652006-P-XX (XX = 2, 5, 10, 20, 30, 50, 100, 300 or 600 bar)

Part numbers, titanium + temperature

0652004-T, 0652005-T, 0652006-T

Software

DIALOGUE X2

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