CastAway - Model CTD -Handheld Castable Instrument

Field Ready and Rugged

The CastAway-CTD is a small, rugged and technically advanced CTD designed for profiling to depths of up to 100m. The system incorporates modern technical features which allow it to achieve a 5 Hz response time, fine spatial resolution and high accuracy. It uses a six electrode flow-through conductivity cell with zero external field coupled with a rapid response thermistor to attain high measurement accuracies. The instrument is simple to deploy, does not require a pump and is hydrodynamically designed to free fall rate of 1 m/s.

The integrated real-time data display screen, internal GPS sensor and automated wireless data transfer are unique features that simplify data collection.

• Salinity Accuracy: 0.1 PSU
• Temperature Accuracy: 0.05°C
• Small size
• Integrated GPS position
• Real-time display screen
• Wireless data transfer
• 5 Hz sampling rate

Each CastAway-CTD cast is referenced with both time and location using its built-in GPS receiver. Latitude and longitude are acquired both before and after each profile. Plots of conductivity, temperature, salinity and sound speed versus depth can be viewed immediately on the CastAway`s integrated color LCD screen in the field.  Raw data can be easily downloaded via Bluetooth to a Windows computer for detailed analysis and /or export at any time.

• Based on temperature resolution and accuracy.
• International Equation of State for sea water (EOS-80).
• 1978 Practical Salinity Scale
• Chen-Millero, 1977. Speed-of-sound in sea water at high pressures.
• Based on 100,000 µS/cm at -5°C.