HOBO MX800 Series Water Data Loggers

HOBO MX800 Series wireless data loggers work with interchangeable sensors to provide a highly configurable solution for monitoring water conductivity/salinity, temperature, level, and dissolved oxygen

  • Product Name:Water Data Loggers
  • Model:HOBO MX800 Series
  • Maunufactor:Onset
  • Country:USA

HOBO MX800 Series wireless data loggers work with interchangeable sensors to provide a highly configurable solution for monitoring water conductivity/salinity, temperature, level, 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.


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


MX801 and MX802

Operating 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

* 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. 


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 

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


The CE Marking identifies this product as complying with all relevant directives in the European Union (EU). 

The UKCA marking identifies this product as complying with all relevant directives in the UK Declaration of Conformity.