HOBO MX2502 Underwater PAR Data Logger

Designed for ecosystem research, protection and restoration, with a compact, rugged, and waterproof design rated for fresh and saltwater environments, the HOBO Bluetooth MX2502 Underwater PAR logger effectively delivers research-grade sensor performance in an easy-to-use, affordable package. It integrates the LI-COR LI-192 quantum PAR sensor that provides the industry’s highest-accuracy underwater light measurement, plus sensors for temperature and tilt. With both water and air calibration factors, this multiparameter logger provides accurate PAR data in either environment. This logger is designed to be easily mounted onto third-party wipers like the ZebraTech Hydro-Wiper (sold separately) using the M-CLP clamp, which can be deployed with HOBO’s underwater lowering frame and/or rebar stakes using the M-BRK-2 mounting bracket. Users can deploy this logger in minutes, configure logging intervals via the free HOBOconnect app, which allows you to wirelessly retrieve data with your mobile device, and eliminating the need to take your laptop into the field. Features - Provides the highest accuracy data using the LI-192 Quantum sensor, the industry standard for logger calibration with built-in measurement averaging to filter out environmental noise - Easily attaches to available wipers for keeping the sensor window clear and mounts on available wipers - Streamlined logger configuration, data offload, data visualization and data sharing, all within the free HOBOconnect app - Convenient and reliable wireless data offload eliminates having to open loggers, connect cables or bring laptops to wet locations - Data quality control from a tilt sensor and a water-detect sensor - Provides PAR data for both water and air calibrations - Simplifies data management and reduces the amount of equipment you need to offload data with single platform - Easy data consolidation, access, and visualization with LI-COR Cloud and an optional MX data plan - Supports optimal aquaculture site selection and design - Rugged and reliable housing and sensor materials provide years operation in harsh aquatic environments. - Recalibration options: LI-COR for factory recalibration service or self-calibrating against a precision reference Specifications Temperature Sensor: - Range: -20° to 50°C (-4° to 122°F) - Accuracy: ±0.2°C - Resolution: 0.008°C (0.014°F) - Drift: <0.01°C (0.018°F) per year - Response Time (90%): 12 minutes in water (typical) Tilt Angle: - Range: 0 to 180° from vertical - Accuracy: ±5° - Resolution: 1° Photosynthetically Active Radiation (PAR): - Range: 0 to 3,000 μmol/m²/s (full sunlight) - Accuracy: ±5% typical (LI-COR LI-192 factory calibration) - Offset: +/-1 μmol - Resolution: 0.16 μmol/m²/s - Spectral Range: 400–700 nm (PAR waveband) - Linearity: Maximum deviation of 1% up to 3,000umol/m2/s - Stability: <= 2% change over one year - Temperature Dependence: ±0.15% per ˚C maximum - Cosine Correction: Optimized for underwater and atmospheric use - Azimuth: <±1% error over 360˚ at 45˚ elevation - Detector: High stability silicon photovoltaic detector (blue enhanced) - Sensor Housing: Corrosion resistant metal with acrylic diffuser for saltwater and freshwater applications Logger: - Operating Range: -20° to 50°C (-4° to 122°F); fresh or saltwater; cannot be frozen in ice - Radio Power: 1.0 mW (0 dBm) - Transmission Range: Approximately 30.5 m (100 ft) line-of-sight - Wireless Data Standard: Bluetooth Low Energy (Bluetooth Smart) - Logging Rate: 1 second to 18 hours - Logging Modes: Fixed interval (normal, statistics) or burst - Memory Modes: Wrap when full or stop when full - Start Modes: Immediate, push button, date & time, or next interval - Stop Modes: When memory is full, push button, date & time, or after a set logging period - Time Accuracy: ±1 minute per month 0° to 50°C (32° to 122°F) - Battery Type: 2/3 AA 3.6 Volt lithium, factory replaceable - Battery Life: 3 years, typical with logging interval of 1 minute and Bluetooth Always On enabled; 6 years, typical with logging interval of 1 minute and Bluetooth Always On & LED disabled. Faster logging intervals and statistics sampling intervals, burst logging, remaining connected with the app, excessive downloads, and paging may impact battery life. - Memory: 195,000 measurements, maximum - Full Memory Download Time: Approximately 4-5 minutes; may take longer the further the device is from the logger - Diameter): 1.695″ - Length: 7.190″ - Weight (Logger): 274 g (0.604 lb.) - Weight (With packaging): 495 g (1.091 lb.) - Materials: Housing: ENTEC PINNACLE PP 4220H 4% COLOR LOADING 2U2069 BLACK Cap: BLACK DELRIN 500P - Environmental Rating: IP68 up to 30 m