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MIDAS CTD

The MIDAS CTD is Valeport's premier CTD Profiler. High accuracy sensors (including ±0.01% pressure) and robust titanium design allow reliable operation to 6000m depth, under the harshest conditions.

MIDAS CTD also features truly synchronised sampling to ensure that all sensors are sampled at exactly the same point during a profile. Primarily for use as a self recording profiler, the MIDAS CTD also has a range of communications options for real-time use, and the low power consumption and large memory also make it suitable for longer-term deployments.

Support

MIDAS CTD Datasheet
Download
MIDAS CTD Operating Manual
Download
DataLog X2 Operating Manual
Download

Software

DataLog X2
Download

Technical Specifications

Sensors

The MIDAS CTD is fitted with Valeport’s high stability conductivity sensor, a high accuracy temperature compensated piezoresistive pressure transducer, and a fast response PRT temperature sensor.

Conductivity
Range: 0 - 80 mS/cm
Resolution: 0.002mS/cm
Accuracy: ±0.01mS/cm
Temperature
Range: -5°C to +35°C
Resolution: 0.005°C
Accuracy: ±0.01°C
Pressure
Range: 10, 20, 30, 50, 100, 300, 400 or 600bar
Resolution: 0.001% range
Accuracy: ±0.01% range

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.

Sampling Modes

Continuous:
Regular output from all sensors at 1, 2, 4 or 8Hz.
Burst:
Regular sampling pattern, an 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.

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, 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
Optional FSK
2 wire power & comms up to 6000m cable (cable dependent)
Baud Rate: 2400 - 115200 (FSK fixed at 19200, USB 460800)
Protocol: 8 data bits, 1 stop bit, No parity, No flow control

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. A single line of CTD data uses 6 bytes, and a time stamp uses 7 bytes.

Continuous:
>2,700,000 data points.
Profile:
>1,200,000 data points (>100 profiles to 6000m).

Electrical

Internal:
8x C cells, 1.5V alkaline or 3.6V lithium
External:
9 – 30VDC
Power:
0.6W (sampling), <1mW (sleeping
Battery Life:
<100 hours operation (alkaline)
<250 hours operation (lithium)
Connector:
SubConn MCBH10F

Software

System is supplied with DataLog X2 Windows-based PC software, for instrument setup, data extraction and display. Valeport DataLog X2 software is licence free.

Physical

Materials:
Titanium housing, polyurethane sensor components, stainless steel (316) cage
Depth Rating:
6000m (may be limited by pressure sensor)
Instrument Size:
88mmØ x 665mm long
Cage Size:
750 x 140 x 120mm
Weight:
11.5kg (in air), 8.5kg (in waterwith cage)
Shipping:
100 x 18 x 49cm
24kg

Ordering

0606001-XX
MIDAS CTD Profiler supplied with:
Deployment cage
SubConn switch plug
3m communications lead
USB adaptor
DataLog x2 software
Manual, tool kit and transit case
0606001-XX-FSK
MIDAS CTD with FSK modem adaptor, supplied with:
Deployment cage
SubConn switch plug
3m communications lead
USB adapter
DataLog X2 software
Manual, tool kit and transit case
0400EA5 FSK modem adapter
Note:
XX denotes transducer range. Select from 10, 20, 30, 50, 100, 200, 300, 400 or 600bar

Options

0400002
16 Mbyte memory upgrade (max 64 Mbyte)
0400EA5
FSK modem adaptor
TB0400FSK
Probe board set required for FSK operation

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