HOBO™ MX801 Dissolved Oxygen and Temperature Data Logger
- Measures and Records Dissolved Oxygen and Temperature
- Fully Submersible and Retrieve for Data Offload Using HOBOconnect App
- Wireless Bluetooth Communications for Setup, Configuration and Data Offload
- Guided Calibration for Accurate Data and Water Detect Feature
- User-Replaceable Lithium Batteries
Includes W-DO Dissolved Oxygen and Temperature Sensor
HOBO MX801-DO Dissolved Oxygen and Temperature Water Data Logger Kit
The HOBO MX801-DO is a complete, ready-to-deploy water monitoring kit that includes a fully submersible, Bluetooth-enabled MX801 data logger and a W-DO Dissolved Oxygen and Temperature sensor. Designed for environmental research, watershed monitoring, aquaculture, and water quality compliance applications, this kit provides accurate dissolved oxygen and temperature measurements in a single compact, easy-to-deploy package. Setup and data offload are handled wirelessly via Bluetooth using the free HOBOconnect app on a compatible mobile device or Windows computer — no cables required to retrieve your data. The IP68-rated logger housing is waterproof to 100 meters (with sensor attached) and features passivated 316 stainless steel hardware rated for use in saltwater environments. Four user-replaceable AA lithium batteries provide up to 1 year of typical battery life with a 5-minute logging interval. Memory supports up to 730,000 measurements with flexible logging modes including fixed interval, burst, and up to 8 user-defined logging intervals. Assembly required. The free HOBOconnect app and a compatible mobile device or Windows computer are required for operation.
Looking for a direct read version of this same device? Check out the MX802 here.
HOBO™ MX801 Submersible Water Data Logger Specifications
| 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. |
| Water Detect | Events are Logged When Data Logger is Submerged or Removed from the water |
| 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") Mounting Loop: 1.27 cm x 2.26 cm (0.5" x 0.89") |
HOBO™ W-DO Dissolved Oxygen Sensor Specifications
| Dissolved Oxygen | Optical Sensor: Dynamic Luminescence Quencing Measurement Range: 0 to 60 mg/L; 0 to 600% Saturation Accuracy (Out of the Box - 0 to 20 mg/L): ±0.2 mg/L (Typical) Accuracy (Out of the Box - 20 to 60 mg/L): ±4.0% Accuracy (With User Calibration - 0 to 20 mg/L): ±0.1 mg/L (Typical) Accuracy (With User Calibration - 20 to 60 mg/L): ±2.0% Resolution: 0.01 mg/L Sensor Drift: Accuracy is Maintained for 2 Years; Aside From the Effects of Fouling Response Time: 90% in less than 45 Seconds DO Sensor Cap Life: 2 Years; Sensor Can continue to Operate Afterwards but not as Accurate |
| Temperature | Measurement Range: -5°C to 50°C (23°F to 104°F), Non-Freezing Accuracy: 0.15°C (0.27°F) Resolution: 0.01°C (0.04°F) Response Time: 90% in less than 15 Minutes |
| Sampling Rate | Maximum 1 Minute |
| Depth Rate | IP68, Waterproof to 100 Meters (328 ft) |
| Wetted Materials | Black Delrin®, PVC, EPDM O-Rings, Rated for Saltwater Use |
| Standard Compliance | CE |
