## Prodotto## SBE-53 BPR Bottom Pressure RecorderSBE-53 BPR Bottom Pressure Recorder The SBE 53 BPR measures full ocean depth water level with extremely high resolution, accuracy, and stability. The BPR combines a uniquely precise and stable time base with low-power frequency-acquisition circuitry, Paroscientific Digiquartz® pressure transducer, non-volatile 32 MB FLASH memory, and a precision thermometer, to provide unprecedented bottom-pressure recording capability. An optional SBE 4M conductivity sensor can be added to provide salinity data. ## SBE-53 BPR Bottom Pressure Recorder## Sea-Bird ElectronicsThe SBE 53 BPR measures full ocean depth water level with extremely high resolution, accuracy, and stability. The BPR combines a uniquely precise and stable time base with low-power frequency-acquisition circuitry, Paroscientific Digiquartz® pressure transducer, non-volatile 32 MB FLASH memory, and a precision thermometer, to provide unprecedented bottom-pressure recording capability. An optional SBE 4M conductivity sensor can be added to provide salinity data.The BPR integrates pressure measurements to obtain water levels (tides) unaffected by wave action. The interval between each water level measurement and the duration of the integration period are user-programmable. The interval is programmable over a range of 1 minute to 1 hour. The integration duration is programmable from 1 minute to the entire tide interval. The BPR can continuously power the pressure transducer and reference frequency oscillator, eliminating turn-on transients and providing the highest quality data. Alternatively, the BPR can be programmed to enter a power-down state between measurements to conserve battery power for very long deployments, with a user-specified warm-up period before each pressure measurement. Temperature data is recorded with each pressure integration. Logging (recording) can be programmed to start and stop at specified times after the instrument is deployed. The pressure and internal temperature compensation signals (frequencies) from the transducer are integrated in parallel for the water level integration duration. The measurement times are set by a continuously powered, real-time clock with an accuracy of ± 5 seconds/month. Long-term drift of the counter's reference frequency is on the order of 1 ppm/year. To allow for correction of drift, an ovenized crystal oscillator is programmed to periodically make a reference frequency measurement. Large memory and low power requirements permit frequent water level recording. For example, with standard alkaline batteries, a 420-day deployment could include water level measurements every 30 minutes (integrating pressure for the entire 30 minutes); a 2-year deployment could be achieved if pressure integration is limited to 4 minutes for each water level measurement, with a 15-minute warm-up of the pressure sensor and reference frequency oscillator before each measurement. Alternatively, deployments approximately 3 times longer are possible with Electrochem DD lithium batteries. Fast binary upload of data in memory can be accomplished at up to 115,200 baud. ## DocumentsBrochureSBE-53 Brochure - Download ManualSBE-53 Manual - Download Application NoteAN 02D: Instructions for Care and Cleaning of Conductivity Cells (03/14) - Download AN 06: Determination of Sound Velocity from CTD Data - Download AN 10: Compressibility Comp of SBE Conductivity Sensors (05/13) - Download AN 14: 1978 Practical Salinity Scale - Download AN 42: ITS-90 Temperature Scale - Download AN 68: Using USB Ports to Communicate with Sea-Bird Instruments - Download AN 69: Conversion of Pressure to Depth - Download AN 70: Installing Anti-Foulant Device Mount Kit on SBE 4, 16, 19, and 21 Conductivity Cells - Download AN 71: Desiccant Use and Regeneration (drying) - Download AN 73: Using Instruments with Pressure Sensors at Elevations Above Sea Level - Download AN 83: Deployment of Moored Instruments - Download Technical PapersExploring the water column from the cabled EMSO-SN1 observatory - TMTW 2018 - Download From the seafloor to the sea surface: a technical solution for the cabled EMSO-SN1 observatory in the Western Ionian Sea - Oceans 2015 - Genova - Download ## CorrelatedSBE-4 Conductivity Sensor SBE 4 series conductivity sensors are modular, self-contained instruments that measure conductivity from 0 to 7 S/m. |