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The standard instrument is fitted with a 0.01% accuracy pressure sensor and acetal housing for up to 500m depth rating, with a deep water titanium housed option also available.
The MIDAS WLR comes with a choice of pressure sensor ranges to suit the depth requirement of the operator. The sensor used is a revolutionary piezoresistive cell with internal temperature compensation, giving the accuracy and resolution levels normally associated with a resonant quartz sensor, but with increased durability, stability and recalibration intervals.
In line with other Valeport MIDAS series instrumentation, the MIDAS WLR samples data points at up to 8Hz, and has a variety of operating modes including continuous data output, triggered sampling, and data bursting. The typical configuration for this instrument is to sample data in a burst mode for a user defined integration period, selectable from a single sample up to 600 seconds. This data burst may then be repeated at a suitable regular interval, from once per minute to once per day. Sampled data may either be recorded in its entirety, or simply averaged and recorded along with standard deviation data. It is usually recommended that data is averaged over an integration period of 40 seconds to filter the effects of any wave activity. Note that Valeport’s distributed processing concept allows the pressure data to be automatically converted into the user’s choice of units, including metres or Feet of water.
Standard memory is 16Mbyte FLASH, which is capable of storing approximately 2.7 million records. The memory is non-volatile, so data and configuration are retained in the event of power failure.
System is supplied with DataLog Express Windows based PC software, for instrument setup, data extraction and display. DataLog Express is license free.
The Tidemaster is the cost-effective way to accurately record water height, with the added option of gathering meteorological data using its ultrasonic wind speed and direction sensor.
Valeport’s industry-leading TideMaster Tide Gauge is as the core of Tidestation, bringing Pressure, Radar and hybrid tidal observation techniques coupled with interfaces to other meteorological and 3rd party systems.