One of the most versatile yet easy to use pressure-based wave recorders available, the MIDAS WTR Wave and Tide Recorder offers fast data upload, a quick change battery carousel and intuitive operating software.
Using the proven Linear Wave Theory wave analysis method of measurement, this recorder benefits from Valeport’s latest sensor measurement technology, together with 64-bit data processing and an improved range of sampling options.
The MIDAS WTR is fitted with a choice of strain gauge or high accuracy piezoresistive 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.
Pressure (high accuracy)
100 dBar (90m water)
50 dBar (40m water)
-5 to +35oC
0 – 80 mS/cm
0 – 2000 FTU
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.
System is supplied with WaveLog Express Windows based PC software, for instrument setup, data extraction and display. WaveLog Express is license free.
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:
Up to 200m cable, direct to serial port via USB adaptor
Up to 1000m cable, addressable half duplex comms
2 wire power & communications up to 6000m of cable
2400 - 115200 (FSK fixed at 38400, USB 460800)
8 data bits, 1 stop bit, No parity, No flow control
Housing rated to 500m Note: pressure sensor may be less
300mmØ x 290mm deep
940 x 940 x 420mm x 35kg
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.
MIDAS WTR Wave Recorder, piezo-resistive type Supplied with: · SubConn switch plug · 3m communications lead · USB adapter · WaveLog Express software · Manual, tool kit and transit case
MIDAS WTR Wave Recorder, strain gauge type Supplied with: · SubConn switch plug · 3m communications lead · USB adapter · WaveLog Express software · Manual, tool kit and transit case.
The most cost-effective solution to directional wave monitoring requirements in all shallow water coastal applications, The MIDAS DWR Directional Wave Recorder represents a significant advance in PUV wave recording technology.