The Valeport factory at Totnes has a tidal range of up to 5m during spring tides. Situated close to the tidal limit of the Dart, it is strongly influenced by flood events driven by heavy rainfall on nearby Dartmoor. Sometimes these events can get a little too close to the factory doors.
A vented pressure sensor is installed below the level of Lowest Astronomical Tide to ensure data is collected even during the low river flows of summer. The sensor datum is referenced to a bench mark surveyed by the University of Plymouth to give an accuracy of ±10mm.
The pressure sensor is connected to a TideMaster installed in the calibration laboratory. The TideMaster controls the sampling pattern, logs the data and is connected to the office network to transmit data via Port-Log to the internet. Data is uploaded every half hour.
Mounted on the roof of the factory, and also connected to this TideMaster, is a Gill MetPak II giving wind speed, direction, air temperature, pressure and humidity.