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Teledyne Valeport Ltd.
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  5. Valeport MIDAS - Model ECM - Self ...

Valeport MIDAS - Model ECM -Self Recording Electromagnetic Current Meter

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The MIDAS ECM is a highly versatile point current meter, designed with durability and ease of deployment in mind. Valeport’s latest electronics architecture allows multiple additional sensors, and a variety of communications options, making it one of the few multiparameter current meters that allows real time operations over several thousand metres of cable, as well autonomous deployments. A choice of titanium or acetal housing gives depth rating up to 5000m.

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Data Acquisition

  • 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

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

Memory

The MIDAS ECM 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 current data uses 10bytes, with each additional parameter taking 2bytes and a time stamp uses 7 bytes. The examples are for an instrument measuring speed, direction and CTD.

  • Continuous: >520,000 data points
  • Profile: >360,000 data points (>15 profiles to 5000m).

Electrical

  • Internal: 8 x D cells, 1.5v alkaline or 3.6v lithium
  • External: 9 - 30vDC
  • Power: 1.7W (sampling),
  • Battery Life:
    • >100 hours operation (alkaline)
    • >250 hours operation (lithium)
  • Connector: Subconn MCBH10F

Physical

  • Materials: Titanium housing, polyurethane sensor components, stainless steel (316) cage
  • Depth Rating: 5000m (titanium), 500m (acetal)
  • Instrument Size: 150mmØ x 700mm long
  • Cage Size: 210mm Ø x 732mm long
  • Weight (in cage): 20kg (titanium), 12kg (acetal)
  • Shipping: 130 x 37 x 32cm, 38kg (titanium), 34Kg (acetal)

Software

  • System is supplied with DataLog Express Windows based PC software, for instrument setup, data extraction and display. DataLog Express is license free.