HOBO™ MX801 Conductivity Data Logger w/ 0 to 251 ft Range
- Measures and Records Conductivity, Temperature and Water Level
- 0 to 100,000 µS/cm and -20°C to 50°C Measurement Ranges
- 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
- Water Level Depth: 0 to 250ft (0 to 76 Meters)
Includes W-CTD Conductivity, Temperature and Water Level Sensor
HOBO MX801-CTD-03 Conductivity, Temperature and Depth Water Data Logger Kit — 0 to 251 ft Range
The HOBO MX801-CTD-03 is a complete, ready-to-deploy water monitoring kit that includes a fully submersible, Bluetooth-enabled MX801 data logger and a W-CTD-03 Conductivity/Temperature/Depth sensor with a water level range of 0 to 76.5 meters (0 to 251 feet). This kit is designed for deeper monitoring applications including deep wells, boreholes, large reservoirs, and coastal or offshore environments where extended depth range is required. In addition to conductivity, temperature, and water level, the logger can calculate specific conductance, salinity, and total dissolved solids (TDS). The 4-electrode conductivity sensor measures across a wide range of 0 to 100,000 µS/cm with ±2% accuracy, and is centrally located to minimize measurement errors from stilling wells or protective guards. Water level typical accuracy is ±0.05% FS (approximately 3.8 cm at full scale). Temperature is measured from -20°C to 50°C with ±0.15°C accuracy. Setup and data offload are handled wirelessly via Bluetooth using the free HOBOconnect app — no need to remove the sensor from the water. The IP68-rated logger housing is waterproof to 100 meters (with sensor attached) and rated for saltwater use. Four user-replaceable AA lithium batteries provide up to 2 years of typical battery life at a 1-minute logging interval. Memory supports up to 730,000 measurements. Assembly required. The free HOBOconnect app and a compatible mobile device or Windows computer are required for operation.
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 Sensor: 2 Years, 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-CTD Conductivity Temperature and Depth Water Sensor Specifications
| Conductivity | Measurement Range (Electrical Conductivity and Specific Conductance): 0 to 100,000 µS/cm Measurement Range (Salinity using PSS-78): 2 to 42 PSU Measurement Range (Total Dissolved Solids): 0 to 100,000 mg/L Calibrated Range (Electrical Conductivity): 50 to 80,000 µS/cm @ 5°C to 35°C (41°F to 95°F) Accuracy (Conductivity): ±2% or 15 µS/cm Whichever is Greater Accuracy (Salinity): ±2% of Reading or 0.1 PSU, Whichever is Greater Resolution (Conductivity): 0.1 µS/cm from 0 to 1,000 µS/cm; 1 µS/cm from 1,000 to 10,000 µS/cm; 10 µS/cm from 10,000 to 100,000 µS/cm Resolution (Salinity): 0.01 PSU Resolution (Total Dissolved Solids): 0.1 mg/L Response Time: 1 second to 90% at a Stable Temperature |
| Absolute Pressure | Measurement Range: 0 to 207 kPa (0 to 30 psia) Factory Calibrated Range: 69 to 207 kPa (10 to 30 psia) @ 0°C to 40°C (32°F to 104°F) Burst Pressure: 310 kPa (45 psia) or 18 Meters (60 ft) Depth Raw Pressure Accuracy* : Maximum Error - ±0.3% FS, 0.62 kPa (0.09 psi) Pressure Response Time**: <1 Second to 90% at a Stable Temperature * Raw 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 | Measurement Range: 0 to 76 Meters (0 to 250 ft) of Water Depth at Sea Level Accuracy*: Typical - ±0.05% FS, 0.5 cm (0.015 ft) Water; Maximum - ±0.1% FS, 1.0 cm (0.03 ft) Water Resolution: <0.02 kPa (0.003 psi), 0.21 cm (0.007 ft) Water * 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. |
| Temperature | Measurement Range: -20°C to 50°C (-40°F to 122°F), Non-Freezing Water Accuracy: ±0.15°C (±0.27°F) from 0°C to 50°C (32°F to 122°F) Resolution: 0.01°C at 25°C (0.018°F at 77°F) Response Time: 3 minutes to 90% in Water (Typical) Drift: <0.1°C (0.18°F) per Year |
| Wetted Materials | Passivated 316 Stainless Steel Housing Rated for Use in Saltwater, Viton and Buna-N O-Rings, PET Sensor Connector Depth Sensor: Ceramic Conductivity Sensor: PET, Platinum Plating on Electrodes Note: Sensor Should be Mounted so That it is Not in Contact with Other Metals |
| Standards Compliance | FCC (US), CE (EU), UKCA, Waterproof to Pressure Sensor Burst Pressure Rating, IP68 |
| Dimensions | 2.5 cm x 15 cm (1.0" x 6.0") |