Valeport MIDAS SVP (Sound Velovity Profiler) (formally 650 Mk2)

Available as:
  • Rental
  • Sale (new & ex rental)

Valeport MIDAS SVP (Sound Velovity Profiler) – Available for rental, hire and purchase from Ashtead Technology.

The Midas SVP (formerly known as the Model 650 Mk2) is the most accurate Sound Velocity Profiler in the world. As well as using Valeport’s digital time of flight sound velocity sensor, it also features our unique synchronised sampling technique to ensure that all sensors are sampled at exactly the same time in exactly the same place. With titanium construction and a variety of communications methods, it can be used for autonomous or real-time profiling in virtually all conditions. The Midas SVP is fitted with Valeport s digital time of flight sound velocity sensor, a fast response PRT temperature sensor, and a high accuracy strain gauge pressure transducer. The Midas SVP uses the concept of distributed processing, where each sensor has its own microprocessor controlling sampling and calibration of readings. Each of these is then controlled by a central processor, which issues global commands and handles all the data. This means that all data is sampled at precisely the same instant, giving superior quality profile data.

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Key features

  • Digital time of flight sound velocity sensor
  • Titanium construction
  • Unique synchronised sampling technique


  • autonomous or real-time profiling in virtually all conditions

Technical specifications

Sound VelocityRange: 1400 - 1600m/s (extended range on request)
Resolution: 0.001m/s
Accuracy: ±0.03m/s
TemperatureRange: -5°C to +35°C
Resolution: 0.005°C
Accuracy: ±0.01°C
PressureRange: Choose from 5, 10, 50, 100 or 600 Bar
Resolution: 0.005% range
Accuracy: ±0.04% range
Sampling Modes
ContinuousRegular output from all sensors at 1, 2, 4 or 8Hz.
BurstRegular sampling pattern, where instrument takes a number of readings, then sleeps for a defined time.
Trip/ProfileData is output as a chosen parameter changes by a set value, usually Pressure for profiling.
ConditionalInstrument sleeps until a selected parameter reaches a set value.
DelayInstrument sleeps until predefined start time
StandardRS 232: Up to 200m cable, direct to serial port.
RS 485: Up to 1000m cable, addressable half duplex comms
RS 422: Up to 1500m cable, addressable full duplex comms
Baud Rate:2400 - 115200 (FSK fixed at 19200, USB 460800)
Protocol:8 data bits, 1 stop bit, No parity, No flow control
Internal8 x C cells, 1.5v alkaline or 3.6v lithium
External9 - 30vDC
Power0.6W (sampling), <1mW (sleeping)
Battery Life<100 hours operation (alkaline) <250 hours operation (lithium)
ConnectorSubconn Titanium MCBH10F
Continuous>1,000,000 data points
Profile:>500,000 data points (46 profiles to 6000m).
MaterialsTitanium housing, polycarbonate & carbon fibre sensor components, stainless steel (316) cage
Depth Rating6000m
SoftwareSystem supplied with DataLog 400 Windows based PC software, for instrument setup, data extraction and display. DataLog 400 is licence free.


Instrument Size88mm x 665 mm3.46 x 27.7""
Cage Size750mm x 140 mm x 120 mm31.25 x 5.5" x 4.72""
Weight (in cage)11.5kg (in air) 8.5kg (in water)5.2lbs (in air), 3.9ilbs (in water)
Shipping160mm x 460mm x 1020mm6.3 x 18.1" x 40.1""29kg13.15lbs