HOBO™ MX801 Conductivity and Temperature Data Logger
- Measures and Records Conductivity, Salinity and Temperature
- 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
Includes W-CT Conductivity and Temperature Sensor
HOBO MX801-CT Conductivity and Temperature Water Data Logger Kit
The HOBO MX801-CT is a complete, ready-to-deploy water monitoring kit that includes a fully submersible, Bluetooth-enabled MX801 data logger and a W-CT Conductivity and Temperature sensor. Ideal for monitoring freshwater and saltwater environments, this kit measures conductivity across a wide range of 0 to 100,000 µS/cm and temperature from -20°C to 50°C, and can additionally calculate specific conductance, salinity, and total dissolved solids (TDS). The 4-electrode conductivity sensor is centrally located to minimize measurement interference from stilling wells and protective guards, and provides ±2% accuracy across the full measurement range. 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. The IP68-rated logger housing is waterproof to 100 meters (with sensor attached) and constructed with passivated 316 stainless steel hardware rated for saltwater use. Four user-replaceable AA lithium batteries provide up to 2 years of typical battery life with a 1-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.
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") Length with W-CT Sensor: 33 cm (13") Mounting Loop: 1.27 cm x 2.26 cm (0.5" x 0.89") |
HOBO™ W-CT Conductivity and Temperature 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 |
| 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 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 100 Meters, IP68 |
| Dimensions | 2.5 cm x 15 cm (1.0" x 6.0") |
