Data Loggers

MX800 Series Water Data Loggers

Highly versatile, modular wireless multiparameter loggers that integrate sensors (purchased separately) for measuring water conductivity/salinity, depth, temperature (CT/CTD), and dissolved oxygen.

Water Data Loggers

Overview

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. 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.

Top reasons customers like award-winning MX800 loggers:

  • A less expensive, non-bulky alternative to sondes that can be difficult to calibrate and maintain
  • Affordable price allows customers to purchase more loggers to swap in and out—saving time and optimizing data quality
  • User-replaceable batteries
  • 2-year vs. 6-month cap life saves resources needed to replace cap to prevent data loss
  • Bluetooth prevents communication issues and the necessity of taking computer into the field
Features
  • Compatible with interchangeable ConductivityCTD (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

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 farther 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

MX801 Logger Head Only

224 g
7.90 oz

MX802 Logger Head Only

226 g
7.97 oz

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

Depth/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. 

Water Data Loggers

Water Data Loggers

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MX800 Series Water Data Loggers
Data Loggers
MX800 Series Water Data Loggers
Data Loggers