Valeport SWiFT - Sensors; 3.1 Sound Velocity Measurement; 3.2 Conductivity; 3.3 Temperature

Important Information
Page | 3
© 2021 – Valeport Ltd
3 Sensors
3.1 Sound Velocity Measurement
Utilising Valeport's latest sound velocity sensor, each measurement is made using a single pulse
of sound travelling over a precisely known distance, so is independent of the inherent calculation
errors present in CTD calculated data. Valeport's unique digital signal processing technique
virtually eliminates signal noise, and gives almost instantaneous response; the digital
measurement is also entirely linear, giving predictable performance under all conditions.
Range:
1375 - 1900m/s
Resolution:
0.001m/s
Accuracy:
±0.020m/s
Response:
31.25 ms
3.2 Conductivity
The inductive conductivity sensor is optimised for water flow through to allow for minimal
disturbance to the water column while rapidly descending to the required depth.
Range:
0 - 80 mS/cm
Resolution:
0.001 mS/cm
Accuracy:
±0.01 mS/cm
Response:
31.25 ms
3.3 Temperature
The SWiFT SVP is fitted with PRT temperature sensor.
The SWiFT CTD is fitted with fast response Thermistor temperature sensor.
Type:
PRT | Thermistor
Range:
-5°C to +35°C
Accuracy:
±0.01°C
Resolution:
0.001°C
Response
PRT: 500 ms
Thermistor: <100 ms
3.4 Pressure Sensor
A 500m rated piezo-resistive pressure transducer:
Type:
Strain Gauge
Accuracy:
±0.01% full range
Resolution:
0.001
Response
31.25 ms