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The MIDAS WTR replaces the popular Model 730W wave recorder, and is one of the most sophisticated pressure based wave recorders available. Powerful onboard data processing uses Linear Wave Theory to give a real time output of wave height and period, together with full spectral analysis. The intuitive setup software allows complex regimes of up to 4096 data points to be analysed, at frequencies up to 8Hz. Quick change battery carousel, USB data upload, large memory, and high accuracy sensors complete the package.
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The MIDAS WTR is fitted with a strain or high accuracy piezo-resistive pressure sensors, and a fast response PRT 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. |
| Sensor |
Type |
Range |
Accuracy |
Resolution |
Pressure (high accuracy) |
Piezo-Resistive |
100dBar (90m water) |
±0.01% |
±0.001% |
Pressure (standard) |
Strain Gauge |
50dBar (40m water) |
±0.04% |
±0.001% |
Temperature |
PRT |
-5 to 35°C |
±0.01°C |
±0.005°C |
Conductivity (optional) |
Inductive Coils |
0 - 80mS/cm |
±0.01 mS/cm |
±0.004 mS/cm |
Turbidity (optional) |
Seapoint STM |
0 - 2000 FTU |
±2% |
±0.005% Scale |
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| 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. |
USB : For rapid upload & laptops without serial ports |
| 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 |
| Baud Rate : 2400 - 115200 (USB 460800) |
| Protocol : 8 data bits, 1 stop bit, No parity, No flow control |
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| 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 data. |
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Physical: |
Materials : Acetal housing, optional stainless stell (316) cage
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| Depth Rating : Housing rate to 500m, pressure sensor may be less |
| Size : 300mmØ x 290mm deep |
| Cage Size : 950 x 950 x 400m |
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