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MIDAS WTR – Wave and Tide Recorder

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.

Support

MIDAS WTR Datasheet
MIDAS WTR Operating Manual

Software

WaveLog Express
F7

Technical Specifications

Sensors

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)

Type
Piezo-
Resistive
Range
100 dBar
(90m water)
Accuracy
+/-0.01%
Resolution
0.001%

Pressure (standard)

Type
Strain
Gauge
Range
50 dBar
(40m water)
Accuracy
+/-0.04%
Resolution
0.001%

Temperature

Type
PRT
Range
-5 to +35oC
Accuracy
+/-0.01oC
Resolution
0.005oC

Conductivity (optional)

Type
Inductive
Coils
Range
0 – 80 mS/cm
Accuracy
+/-0.01 mS/cm
Resolution
0.004 mS/cm

Turbidity (optional)

Type
Seapoint
STM
Range
0 – 2000 FTU
Accuracy
+/-2%
Resolution
0.005% Scale

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.

Electrical

Internal:
32 x D cells, 1.5V alkaline or 3.6V lithium
External:
9 – 30V DC
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

Software

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

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
Optional FSK
2 wire power & communications up to 6000m of 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
940 x 940 x 420mm x 35kg

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.

Ordering

0730033
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
0730034
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.
0730037
Stainless steel deployment cage
0400011
Optional Conductivity sensor
0400021B
Optional Turbidity sensor
0400021BI
Turbidity sensor interface

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