HOBO™ Bluetooth Water Data Logger
- Measures Conductivity, Salinity, Temperature and Barometric Pressure (Depth)
- Data Logger Remains Above the Water and Cables and Sensors Extend into Fresh or Salt Water
- Wireless Bluetooth Communications for Setup, Configuration and Data Offload Using HOBOconnect App
- Guided Calibration for Accurate Data and Water Detect Feature
- User-Replaceable Lithium Batteries
- Interchangeable Sensors for Dissolved Oxygen (W-DO) and Conductivity (W-CT)
Requires W-CT Conductivity and Temperature, W-CTD Conductivity, Temperature and Depth or W-DO Dissolved Oxygen Sensor.
HOBO MX802 Direct Read Bluetooth Water Data Logger
The HOBO MX802 is a Bluetooth-enabled multiparameter water data logger designed for applications where convenient data offload without removing sensors from the water is a priority. Unlike the fully submersible MX801, the MX802 is designed to remain above the water surface while compatible W-Series sensors are deployed underwater via cable — making it ideal for installations where the logger needs to remain accessible, such as monitoring wells, bridges, docks, or fixed infrastructure. The MX802 is IP67/NEMA 6 weatherproof (with sensor or termination plug attached) and constructed from PVC with passivated 316 stainless steel hardware rated for use in saltwater environments. Setup, configuration, and data offload are handled wirelessly via Bluetooth using the free HOBOconnect app on a compatible mobile device or Windows computer. Four user-replaceable AA lithium batteries provide up to 2 years of typical battery life. Memory supports up to 730,000 measurements with flexible logging modes including fixed interval, burst, and up to 8 user-defined logging intervals. Compatible sensors (sold separately) include the W-CT Conductivity/Temperature sensor, W-CTD Conductivity/Temperature/Depth sensors (available in four depth ranges), and the W-DO Dissolved Oxygen/Temperature sensor. Sensor cables are available in lengths from 1.0m to 60m (custom lengths also available).
Looking for a fully submersible version of this same device? Check out the MX801.
HOBO™ MX802 Water Data Logger Specifications
| Barometric Pressure | Measurement Range: 66 to 107 kPa (9.6 to 15.5 psi) @ -20°:C to 50°:C (-4°F to 122°F) Accuracy* (Typical Error): ±0.2 kPa (0.029 psi) Accuracy (Maximum Error): ±0.5 kPa (0.073 psi) Resolution: <0.01 kPa (0.0015 psi) Pressure Response Time**: <1 Second to 90% at a Stable Temperature Contribution to Water Level Accuracy*** (Typical Error): ±0.075% FS, 0.3 cm (0.01 ft) water Contribution to Water Level Accuracy*** (Maximum Error): ±0.15% FS, 0.6 cm (0.02 ft) water * Pressure Accuracy: Absolute Pressure Sensor Accuracy includes All Sensor Drift, Temperature and Hysteresis-Induced Errors. ** Changes in Temperature: Allow 20 Minutes in Water to Achieve Full Temperature Compensation of the Pressure Sensor. There can be up to 0.5% of Additional Error due to Rapid Temperature Changes. *** Water Level Accuracy: With Accurate Reference Water Level Measurement, Known Water Density, and a Stable Temperature Environment. System Water Level Accuracy Equals the Sum of the Barometric Water Level Accuracy Plus the Selected CTD Sensor Water Level Accuracy. |
| Operating Range | -40°C to 50°C (-40°F to 122°F) |
| Wireless Communications | Radio Power:1.0 mW (0 dBm) Transmission Range: 30.5 Meters (100 ft) Line of Sight Wireless Data Standard: Bluetooth 5 |
| Number of Sensors that can be Connected | 2 |
| Maximum Cable Length | 120 Meters (400 feet) |
| Sampling Interval | 5 Seconds to 18 Hours |
| Recording Mode | Fixed Interval (Normal or Statistics), Burst or Multiple Intervals with Up to 8 User-Defined Logging Intervals and Durations, with Pause and Repeat Options |
| Start Modes | Immediate, Next Interval or Date/Time |
| Stop Modes | Memory Full, Never Stop (Overwrite Oldest Data), Date/Time or After A Set Logging Period. |
| Time Accuracy | ±1 minute per month 0°C to 50°C (32°F to 122°F) |
| Power Source | (4) AA 1.5 Volts User Replaceable Lithium Batteries |
| Battery Life | With W-CTD or W-CT Sensors: 2 Years, Typical with 1-Minute Logging Interval or Slower With W-DO Sensor: 1 Year, Typical with 1-Minute Logging Interval or Slower Faster Logging or Statistics Sampling Intervals, Entering Burst Logging Mode, Excessive Readouts, and Remaining Connected with the App will Impact Battery Life |
| Data Storage Capacity | 730,000 Measurements, Divided Between Channels (4 Mbyte Memory) |
| Data Download Time | Full Memory: Approximately 3.5 Minutes 120,000 Measurements: 1 Minute May Take Longer the Further the Device is From the Data Logger |
| Wetted Materials | Data Logger: PVC Housing with Polyester Film Label, PET Sensor Connector End Cap and Mounting Handle with EPDM and Buna-N O-Rings, Passivated 316 Stainless Steel Hardware Rated for Use in Saltwater Collar: HDPE, Titanium Screws Note: Data Logger Should be Mounted So That No Metal Parts of the Data Logger are in Contact with Other Metals |
| Standards Compliance | FCC (US), CE (EU), UKCA, Waterproof to 100 Meters with Sensors Attached (IP68) |
| Dimensions | Data Logger Diameter: 4.14 cm (1.63") Length without Sensor: 20 cm (8.0") Length with W-CTD Sensor: 36 cm (14") Length with W-CT Sensor: 33 cm (13") Mounting Loop: 1.27 cm x 2.26 cm (0.5" x 0.89") |
