HOBO^® MX2309 Temp/RH/Solar Data Logger

Temperature Sensor – Range: -40 to 149 °F (-40 to 65 °C). Accuracy: ±0.2 °C (typical) within -40 to 65 °C. Resolution: .014 °F (0.008°C). Drift: <0.018°F (0.01°C) per year. Relative Humidity (RH) Sensor – Range: 0 to 100% RH, -40° to 149 °F (-40° to 65 °C); exposure to conditions below -4°F(-20°C) or above 95% RH may temporarily increase the maximum RH sensor error by an additional 1. Accuracy: ±2.5% from 10% to 90% (typical) to a maximum of ±3.5% including hysteresis at 77°F (25°C); below 10% RH and above 90% RH ±5% typical. Resolution: 0.01% RH. Drift: <1% per year typical. Global Solar Radiation Sensor – Range: 0 to ~1280 W/m² (full sunlight). Accuracy: ±3% typical, ± 5% maximum (LI-200R Absolute Calibration). Offset: ± 0.5 W/m². Resolution: 0.05 W/m². Spectral Range: 400–1100 nm. Linearity: Maximum deviation of 1% up to 3,000 W m-2. Stability: <= 2% change over one year. Temperature Dependence: ±0.15% per ˚C maximum. Cosine Correction: Cosine corrected up to 82˚ angle of incidence. Azimuth: <±1% error over 360˚ at 45˚ elevation. Tilt: No error induced from orientation. Detector: High stability silicon photovoltaic detector (blue enhanced). Sensor Housing: Weatherproof anodized aluminum case with acrylic diffuser and stainless steel hardware. O-ring seal on the sensor base. Sensor Size: (095” x 1.43”). Cable Length: 1.8 m. Calculated Metrics –  Accumulated Solar Radiation in MJ/m², Daily Light Integral (DLI) of Solar in MJ/m²/day, Vapor Pressure Deficit (VPD) in kPa, and Dew Point. Response Time (typical, to 90% of charge) – Temperature: Without Solar Radiation Shield, 17 minutes in air moving 1 m/sec; With RS1 Solar Radiation Shield, 24 minutes in air moving 1 m/sec. Relative Humidity (RH): Without Solar Radiation Shield, 30 seconds in air moving 1 m/sec; With RS1 Solar Radiation Shield, 40 seconds in air moving 1 m/sec. Logger – Operating Range: -40 to 149 °F (-40 to 65 °C). Radio Power: 0.4mW (-4 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 32° to 122°F(0° to 50°C ). Battery Type: 2/3 AA 3.6 Volt lithium, user replaceable. Battery Life: 2 years, typical with logging interval of 1 minute and Bluetooth Always On enabled; 5 years, typical with logging interval of 1 minute and Bluetooth Always On disabled. Faster logging intervals and statistics sampling intervals, burst logging, remaining. Memory: 195,000 measurements, maximum. Full Memory Download Time: Approximately 4-5 minutes (may take longer the further the device is from the logger). Dimensions: Logger housing, 4.25˝ x 2.0˝ x 0.88˝; LI-190R, 0.93˝ × 1.43˝. Weight: 5.26 oz. Environmental Rating: NEMA 6 and IP67.