CTD Systems

SWiFT CTDplus Turbidity

Designed for a Seamless Workflow

The new SWiFT CTDplus Turbidity is the latest in Valeport’s popular range of SWiFT profilers and delivers enhanced accuracy and versatility for those requiring combined CTD measurements and Turbidity observations.

Valeport Limited

Totnes, GB

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Description

Measured CTD with all the benefits of the SWiFT

The new SWiFT CTDplus Turbidity profiler provides survey-grade sensor technology coupled with the convenience of Bluetooth^® wireless technology, rechargeable battery and an integral GPS module to geo-locate each profile.

Ease of use is at the heart of the SWiFT range and the new SWiFT CTDplus Turbidity not only makes any problematic battery changes a thing of the past and delivers fully automated data transfer with no user input required, it also features Valeport’s signature SWiFT magnetic switch ring. The switching ring is easy to operate even with cold hands, it simply turns through 90 degrees and reassuringly clicks into position. The end cap features user-friendly LED indications for operational status, GPS, battery and Bluetooth^® wireless technology.

Enhanced accuracy

Using Valeport’s world-leading high-accuracy sensor technology to combine sensors for multiple profiles in a single drop, the SWiFT CTDplus Turbidity features a new fast response temperature probe and operates down to 500m as standard, delivering directly measured Conductivity, Temperature and Depth with Turbidity observations. In addition, the SWiFT CTDplus Turbidity will provide computed Salinity, Density and Sound Velocity. 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 eliminate the need to switch a gain.

SOFTWARE

Download and review data with Valeport Ocean

Data can be quickly and easily downloaded wirelessly and uses Valeport’s new Ocean software for Windows, iOS and Android. Data can be instantly shared in industry-standard data formats.

Multiple Applications

With an operational battery life of up to five days and the convenience of charge via USB, the SWiFT CTDplus Turbidity is intended for offshore, coastal, harbour and inland environmental and hydrographic survey use. The SWiFT CTDplus Turbidity is robust and portable. Constructed from titanium to provide unmatched durability, the CTD sensors are housed in a strong acetal protective cage. An optional deployment cage is also available to bolt onto the instrument to secure additional weight and so help the SWiFT CTDplus Turbidity get to depth in fast-flowing currents.

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Specifications

General: Year of initial development

2021

Weight in air [kg]

2.7

Diameter [mm]

78

Length [mm]

350

Housing Material

Titanium

Observations: Resolution of salinity [psu]

0.01

Resolution of sound velocity [m/s]

0.25

Pressure, temperature and conductivity sensor: Pressure sensor

Y

Type of pressure sensor

Temperature compensated piezo-resistive pressure transducer

Resolution of pressure [% FS]

0.001

Accuracy of pressure sensor

±0.01% FS

Temperature sensor

Y

Type of temperature sensor

Fast response thermistor temperature sensor

Min. temperature [°C]

-5

Max. temperature [°C]

35

Resolution of temperature [°C]

0.001

Accuracy of temperature measurement

±0.01°C

Conductivity sensor

Y

Type of conductivity sensor

Polyurethane coated titanium with ceramic core

Max. conductivity [S/m]

80

Resolution of conductivity [10^-3 S/m]

0.001

Accuracy of conductivity measurement

±0.01 m/s

Software specifications: Software name

Valeport Ocean

Graphical presentation

Y

Raw data editing

Y

Re-computation with raw data

Y

CTD Probe controller

Y

Recording with third party software

Y

Environmental: Max. depth [m]

500

Max. pressure [bar]

50

Operating temperature: min. [°C]

-5

Operating temperature: max. [°C]

35

Data and connectivity: External recorder required

N

Direct data reading

Y

Connectors

USB

Internal memory

N

Telemetry link to remote location

Y

Power: Battery

Y

Battery type

Internal rechargeable Li-ion battery pack

Battery duration [hr]

Up to 5 days operations

Additonal sensors: Standard sensor

Turbidity

No. of additional sensors

1

Description of additional sensors

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)