SWiFTplus Turbidity CTD and Multiparameter Instruments

SWiFTplus combines wide range Turbidity observations with Valeport’s survey grade sound speed, temperature and pressure sensor technology coupled with the convenience of Bluetooth connectivity and rechargeable batteries. An integral GPS module, to geo-locate each profile, completes the package.

Data can be easily and quickly downloaded and reviewed wirelessly, via Bluetooth, using an App and instantly shared, in industry-standard SVP formats through email and cloud services. Using the provided USB adapter or cable, Valeport’s Connect software package provides further tools.

In addition to the directly measured turbidity, sound speed, temperature and pressure observations, Conductivity, Salinity and, therefore, Density is calculated using Valeport’s proprietary algorithm developed from extensive laboratory and fieldwork.


  • Multi-Parameter Profiler.
    – CTD, Sound Speed, Salinity, Density.
    – Dual Optical Backscatter (OBS) and Nephelometer Turbidity Sensor.
  • 32Hz sampling rate.
  • Bluetooth and USB connectivity.
  • Integral GPS receiver for profile geo-location.
  • Rechargeable Lithium-Ion Batteries.
  • Dedicated PC software and iOS portable device App.

Valeport’s Turbidity technology is essentially two sensors in one. The first is a “classic” nephelometer, using a 90˚ beam angle for turbidity levels between 0 and 2,000 NTU. The second sensor uses Optical Backscatter (OBS) for turbidity levels up to 10,000 NTU.

The sensors output data separately and simultaneously at a programmable rate. This means that there is no need to switch ranges as conditions vary. Intelligent sampling and the use of a 24 bit ADC eliminates the need to switch gain.


Linear Range Nephelometer: 0 to >1 ,000 NTU – linear response¹
OBS: 0 to >4,000 NTU – linear response 1 & 2
¹ depending on suspended material
² >4,000 NTU has a non-linear monotonic response that allows derivation of higher values using look-up tables\secondary calibration
Linearity 0.99 R²
Minimum Detection Level 0.03 NTU (Nephelometer)
Range 0 – 80 mS/cm
Resolution 0.001 mS/cm
Accuracy ±0.05 mS/cm
Temperature (Platinum Resistance Thermometer)
Range -5°C to +35°C
Resolution 0.001°C
Accuracy ±0.01°C
Pressure (Temperature compensated piezo-resistive pressure transducer)
Range 50 Bar
Resolution 0.001% FS
Accuracy ±0.01% FS
Sound Velocity (Digital time of flight sensor)
Range 1375 – 1900 m/s
Resolution 0.001 m/s
Accuracy ±0.02 m/s
Range 0 – 42 PSU
Resolution 0.001 PSU
Accuracy ±0.05 PSU
Range 990 – 1035 kg/m3
Resolution 0.001 kg/m3
Accuracy ±0.05 kg/m3
Physical dimensions
Materials Housing: Titanium
Sinker weight: Stainless steel
Optical window: Sapphire glass
Depth rating 500m
Dimensions Ø78mm x Length 307mm
(with sinker weight)
Weight 2.7kg (in air) / 1.7kg (in water)
including optional sinker weight
Communications (set-up and data offload)
Bluetooth v4 – low energy
USB Serial
2 GB Internal Flash Card Storage
Battery Internal rechargeable Li-ion battery pack
Charging USB – Supplied mains AC adapter
  •  Connect iOS for Bluetooth compatible mobile devices:
    • instrument set-up, data offload and data display
  • Connect PC for both USB and Bluetooth connectivity:
    • instrument set-up, data offload and data display
  • Both will export data in common file formats that are compatible with industry-standard Hydrographic software packages
  • Android App to follow