Prodotto

SBE-26plus Wave & Tide Recorder

Sea-Bird Electronics

The 26plus combines Sea-Bird's non-volatile FLASH memory with a stable time base, precision thermometer, and Quartz crystal pressure sensor to provide wave and tide recording of unprecedented resolution and accuracy, along with high-quality temperature information. An input connector for an optional SBE 4M conductivity sensor is standard. The 26plus integrates pressure samples to obtain water level measurements unaffected by wave action, and also independently burst-samples pressure at rates up to 4 Hz for wave amplitude calculation. Water level and wave burst sampling intervals and durations are programmable. The tide interval is programmable from 1 minute to 12 hours. The 26plus can continuously measure pressure (with Quartz pressure sensor), or can conserve battery power by removing power from the pressure sensor between tide measurements, with programmable pressure integration from 10 seconds to the entire tide interval. Temperature data is recorded with each tide integration. Waves are characterized by burst sampling, with programmable burst interval, number of samples per burst, and burst integration time. Logging start and stop times are programmable, allowing complete setup in the lab before deployment. The large memory and low power requirements permit frequent water level recording and highly detailed wave characterization. For example, with Quartz pressure sensor, standard alkaline batteries, and optional conductivity sensor, a 445-day deployment can include water level measurements every 30 minutes (integrating pressure for the entire 30 minutes) and an 8.5-minute, 4 Hz wave-burst (2048 samples) eight times a day; a 670-day deployment can be achieved if pressure integration is limited to 11 minutes for each water level measurement. The 26plus stores data in memory, and also outputs real-time tide data, wave data, and/or wave statistics. Binary upload capability at 115,200 baud allows for fast upload of data in memory upon recovery. Firmware upgrades can be downloaded via the serial interface, without opening the instrument.