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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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The MIDAS ECM uses Valeport’s robust 11cm discuss
electromagnetic current sensor, allied to a flux gate compass
(calibrated for <1° accuracy anywhere in the world) and a choice of
optional additional sensors.
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| Sensor |
Type |
Range |
Accuracy |
Resolution |
Current |
Valeport EM |
0 - 5m/s |
±1% reading |
0.001m/s |
Direction |
Fluxgate |
0 - 360° |
±<1° |
0.001° |
Pressure |
Strain Gauge |
Up to 500Bar |
±0.04% |
0.005% |
Temperature |
PRT |
-5 to +35°C |
±0.005°C |
0.002°C |
Conductivity |
Inductive Cell |
0 - 80mS/cm |
±0.01mS/cm |
0.002mS/cm |
Turbidity |
Seapoint STM |
0 - 2000FTU |
±2% |
0.002% |
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Data Acquisition:
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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 |
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| 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, some fitted
as standard and selected by pin choice on the output connector: |
| Standard: |
| RS232 : Up to 200m cable, direct to serial port. |
| RS485 : Up to 1000m cable, addressable half duplex comms |
| RS422 :Up to 1500m cable, addressable full duplex comms |
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| Options: |
FSK : 2 wire power & comms up to ~3500m cable
(maximum cable length depends on cable
specification - consult Valeport for confirmation) |
| USB : For rapid upload or laptops without serial port |
| Baud Rate : 2400 - 115200 (FSK fixed at 19200, USB 460800) |
| Protocol : 8 data bits, 1 stop bit, No parity, No flow control |
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| 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)
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| Connector : Subconn Titanium MCBH10F |
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| Memory: |
The MIDAS ECM is fitted with 8Mb 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 10 bytes, with each additional parameter
taking 2 bytes and a time stamp using 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). |
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| Physical: |
| Materials : Titanium or acetal housing, polyurethane & acetal sensor components, stainless steel cage |
| Depth Rating : 5000m (Titanium), 500m (acetal) |
| Instrument Size : 150mmØ x 750mm long |
| Weight : 20kg (titanium), 12kg (acetal) |
| Shipping : 860 x 530 x 310mm, 36kg (titanium),28kg (acetal) |
