Valeport MIDAS - Model CTD+ - Multiparameter Profiler
From Ocean Engineering
The MIDAS CTD+ is a revolutionary Multiparameter CTD, with a wide choice of standard sensors. Featuring Valeport's latest 400 Series electronics, the CTD+ will sample all fitted sensors at exactly the same instant, at up to 8Hz. Advanced setup software allows a variety of sampling regimes including burst modes, delay starts, and conditional sampling. With up to 64Mbyte memory and internal battery pack, as well as a selection of real time output formats, the CTD+ is perfect for both profiling or fixed mooring applications. In addition, the CTD+ may be used with Valeport own water bottle carousel.
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Valeport applies its unique distributed processing...
Valeport applies its unique distributed processing technology to the MIDAS CTD+, resulting in a multiparameter CTD that is essentially tailor made to suit each customer’s requirements. The instrument is able to accept any combination of a range of industry standard sensors, giving calibrated data in both autonomous and real time operations. A choice of titanium or acetal construction makes it suitable for coastal or deep water operations, and the intuitive software allows a range of both simple and complex sampling regimes.
Specifications
Sensors
The MIDAS CTD+ is fitted with CTD sensors as standard, plus your choice of optional additional sensors, either remote or bulkhead mounted. The CTD+ can also operate with Valeport’s water sampler system, described on a separate brochure.
Data Acquisition
Data Acquisition
The MIDAS CTD+ 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. It also allows additional sensor to be added or replaced in the field, without the need for factory recalibration.
- Continuous: Regular output from all sensors at 1, 2, 4 or 8Hz.
- Burst: Regular sampling pattern, where instrument takes a number of readings, then sleeps for a defined time.
- Trip/Profile: Data is output as a chosen parameter changes by a set value, usually Pressure for profiling.
- Conditional: Instrument sleeps until a selected parameter reaches a set value.
- Delay: Instrument sleeps until predefined start time
Memory
The MIDAS CTD+ is fitted with 16Mb solid state non-volatile FLASH memory. Total capacity depends on sampling mode; continuous & burst modes have a single time stamp at the start of the file, trip mode (profiling) stores a time stamp with each reading. Each parameter uses 2 bytes per sample and a time stamp uses 7 bytes. The examples are for an instrument measuring CTD and 3 other parameters.
- Continuous: ~1,400,000 data points
- Profile: >850,000 data points (60 profiles to 6000m).
Electrical
- Internal: 8 x D cells, 1.5v alkaline or 3.6v lithium
- External: 9 - 30vDC
- Power: 1.7W (sampling), <1mW (sleeping)
- Battery Life:
- >100 hours operation (alkaline)
- >250 hours operation (lithium)
- Connector: Subconn MCBH10F
Communications
The instrument will operate autonomously, with setup and data extraction performed by direct communications with PC before and after deployment. It also operates in real time, with a choice of communication protocols for a variety of cable lengths, all fitted as standard and selected by pin choice on the output connector:
Standard
- RS232 Up to 200m cable, direct to serial port via USB adaptor
- RS485 Up to 1000m cable, addressable half duplex comms
Options
- FSK 2 wire power & comms up to 6000m cable (cable dependant)
- Baud Rate: 2400 - 115200 (FSK fixed at 19200, USB 460800)
- Protocol: 8 data bits, 1 stop bit, No parity, No flow control
Physical
- Materials: Titanium housing, polyurethane & acetal sensor components, stainless steel (316) cage
- Depth Rating: 6000m (titanium), 500m (acetal)
- Instrument Size: 150mmØ x 590mm long
- Cage Size: 210mmØ x 660mm long
- Weight (in cage): 20kg (titanium), 12kg (acetal)
- Shipping guide: 82 x 62 x 36cm, 38kg (titanium), 30kg (acetal)
Software
System is supplied with DataLog Pro Windows based PC software, for instrument setup, control, data extraction and display.
DataLog Pro is license free.
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