The Aanderaa SeaGuard WLR Water Level Recorder is a robust instrument based on the SeaGuard Platform. It is a self contained instrument for measuring tide and temperature. The instrument can be used as a platform for additional measurements (e.g. CTD, current, dissolved oxygen and turbidity). SeaGuard WLR comes in 300m, 3000m and 6000m depth ranges.
SeaGuard Water Level Recorder measures hydrostatic pressure based on a silicon pressure sensor 5217. The pressure measurements are sampled and temperature compensated by an advanced Digital Signal Processor.
The SeaGuard WLR application areas are in fixed installations, either deployed in a seabed installation in shallow waters, or mounted onto a fixed structure in the upper water column. Typical applications for the sensor are measurements of tide in ports and harbours, marine operations, hydrography, weather forecast, and climate studies.
The tide measurement is an average of the hydrostatic pressure measured over a time period of 10 seconds to 8 minutes (Integration time configurable by the user).The update interval is between 2 seconds and 2 hours.
The SeaGuard WLR output parameters are tide pressure, tide level, pressure and temperature. Tide levels are preliminary internally calculated estimates, based on fixed user selectable values of atmospheric pressure and water salinity. Compensation for actual atmospheric pressure and salinity can be postprosessed if such data is available. Tide pressure is an average of hydrostatic pressure over the integration time.