HOBO MX800 Series multiparameter wireless data loggers work with interchangeable sensors to provide a highly configurable solution for monitoring water conductivity/salinity, temperature, depth, and dissolved oxygen (coming soon). Available in both an easy-to-deploy, fully submersible model (MX801) and a direct read model (MX802) for convenient data offload that doesn’t require having to remove sensors from the water.
Requires the HOBOconnect mobile app and a compatible mobile device or Windows computer. System requirements for the app can be found at the bottom of our HOBOconnect software page.
Highlighted Features
- Compatible with interchangeable Conductivity, CTD (conductivity/temperature/depth), and DO sensors (sold separately) - swap out sensors for different applications
- Bluetooth, for easy logger configuration and data offload
- Easy to deploy, fully submersible (MX801)
- Direct read for convenient data offload (MX802)
- Logger diameter is less than 2 inches
- Faster data offload via Bluetooth 5.0
- Water detect feature indicates when logger was out of the water (MX801)
- Barometric pressure sensor included (MX802)
- Connect two sensors to one logger to get measurements like salinity adjusted DO directly, with no need for post-processing
- Guided calibration ensures accurate data
- User-replaceable batteries
Specifications
| MX801 and MX802 | |
|
Operation Range |
-40° to 50°C (-40° to 122°F), cannot be frozen in ice |
| Radio Power | 1 mW (0 dBm) |
| Transmission Range | Approximately 30.5 m (100 ft) line-of-sight |
| Wireless Data Standard | Bluetooth 5 |
| Number of sensors that can be connected | 2 |
| Maximum Cable Length | 120m (400 ft) |
| Logging Rate | 5 second to 18 hours |
| Logging Modes | 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 logger is submerged or removed from the water (MX801 only) |
| Time Accuracy | ±1 minute per month 0° to 50°C (32° to 122°F) |
| Battery | Four AA, 1.5 V lithium batteries, user replaceable |
| 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 5-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 |
| Memory | 730,000 measurements, divided between channels (4 Mbyte memory) |
| Data Download Time (with Bluetooth 5+ devices) | Full memory: Approximately 3.5 minutes 120,000 measurements: 1 minute May take longer the further the device is from the logger |
| Barometric Pressure (MX802 only) | |
|
Measurement & Calibrated Range |
66 to 107 kPa (9.6 to 15.5 psia), -20° to 50°C (-4° to 122°F) |
| Accuracy* | Typical error: ±0.2 kPa (0.029 psi) 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 Maximum error: ±0.15% FS, 0.6 cm (0.02 ft) water |
| MX801 & MX802 Specs, continued: | |
| Dimensions | Logger diameter: 4.14 cm (1.63 inches) Length without sensor: 20 cm (8 inches) Length with W-CTD sensor: 36 cm (14 inches) Length with W-CT sensor: 33 cm (13 inches) Mounting loop: 12.7 x 22.6 mm (0.5 x 0.89 inches) |
| Weight | Approximately xx g (xx oz) in air; approximately xx g (xx oz) in saltwater |
| Wetted Materials | 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; MX802 also has ePTFE vent Collar: HDPE, titanium screws Note: logger should be mounted so that no metal parts of the logger are in contact with other metals |
| Environmental Rating | MX801: IP68; waterproof to 100m (with sensor(s) attached) MX802: IP67, NEMA 6; Weatherproof (with cable or Termination Plug attached); this model is not waterproof |
* 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.