Valeport MIDAS - Model WTR - Wave and Tide Recorder
From Wave Recorders
The MIDAS WTR Wave Recorder uses the proven Linear Wave Theory wave analysis method of measurement. The MIDAS WTR benefits from Valeport’s latest sensor measurement technology, together with 64 bit data processing, and an improved range of sampling options. Fast data upload, quick change battery carousel and intuitive operating software make the MIDAS WTR one of the most versatile yet easy to use pressure based wave recorders available.
Specifications
Sensors
The MIDAS WTR is fitted with a choice of strain gauge or high accuracy piezo-resistive pressure sensors, and a fast response PRT temperature sensor as standard. Note that whilst the piezo-resistive sensor offers a higher absolute accuracy, the quality of wave data owes more to deployment location and sampling pattern than to sensor performance. Optional additional sensors include Conductivity and Turbidity.
Data Acquisition
Data Acquisition
In order to correctly measure wave activity, Linear Wave Theory requires a specific number of data points to be sampled over a period of time. These data points are then processed on board the instrument to generate an accurate summary of the wave activity during the measured period. The MIDAS WTR therefore operates in a strict pattern of “sample, process, sleep”, with the user controlling the number of samples and the sampling rate, together with the duration of the sleep period. This may be minimised for almost continuous sampling, but obviously at the expense of battery and memory usage.
- Sample Rate: 1, 2, 4 or 8Hz.
- No of Samples: Powers of 2, 128 - 4096 (more samples = better data)
- Cycle Time: Minimum cycle time is nearest whole number of minutes after processing has finished.
- Delay Start: Instrument can be programmed to begin sampling at a specific time.
- Conditional: Wave Sampling only occurs if pressure activity exceeds a defined level.
Memory
- The MIDAS WTR is fitted with 64Mb solid state non-volatile FLASH memory. Total capacity depends on setup. User may save any or all of the following:
- Raw sensor data from each burst
- Summary statistics of wave burst
- Tide & additional sensor data
- Spectral analysis of wave burst.
- If all data is saved, memory will typically record over 4000 data bursts. Sampling once per hour, this is over 5 months of data.
Electrical
- Internal: 32 x D cells, 1.5v alkaline or 3.6v lithium
- External: 9 - 30vDC
- Power: 0.7W (sampling), <1mW (sleeping)
- Battery Life: Depends on sampling setup, typically:
- >2 months operation (alkaline)
- >5 months operation (lithium)
- Connector: Subconn Titanium 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
- Baud Rate: 2400 - 115200 (FSK fixed at 38400, USB 460800)
- Protocol: 8 data bits, 1 stop bit, No parity, No flow control
Physical
- Materials: Acetal housing, optional stainless steel (316) seabed deployment frame
- Depth Rating: Housing rated to 500m
- Note: pressure sensor may be less
- Size: 300mmØ x 290mm deep
- Weight: 12Kg
- Frame Size: 940 x 940 x 420mm
- Frame Weight: 35Kg
Software
- System is supplied with WaveLog Express Windows based PC software, for instrument setup, data extraction and display.
- WaveLog Express is license free.
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