HOBO™ Submersible Water Data Logger

Name: HOBO™ Submersible Water Data Logger
Brand: HOBO - LiCor Brand
SKU: MX801
Price: 529.00 USD
Availability: InStock

SKU

MX801

Special Order

$529.00

Measures Conductivity, Salinity, Temperature, Depth or Dissolved Oxygen
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

Requires W-CT Conductivity and Temperature, W-CTD Conductivity, Temperature and Depth or W-DO Dissolved Oxygen Sensor.

Special order - please note lead times for some items can take up to 8 weeks

What do you Want to Measure

Conductivity, Temperature and Depth

Conductivity and Temperature + $585.00

Dissolved Oxygen and Temperature + $1,099.00

Qty

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Overview

HOBO MX801 Submersible Bluetooth Water Data Logger

The HOBO MX801 is a fully submersible, Bluetooth-enabled multiparameter water data logger designed to work with interchangeable W-Series sensors for monitoring water quality, level, and environmental conditions. Whether you need to measure conductivity, temperature, depth, dissolved oxygen, or a combination of these parameters, the MX801 provides a single, flexible platform that can be configured for a wide range of freshwater and saltwater monitoring applications. Setup, configuration, and data offload are all handled wirelessly via Bluetooth using the free HOBOconnect app on a compatible mobile device or Windows computer — no cables, no docking stations, and no need to remove sensors from the water. The IP68-rated housing is waterproof to 100 meters (with sensor attached) and constructed from PVC with passivated 316 stainless steel hardware rated for use in saltwater environments. Four user-replaceable AA lithium batteries provide up to 2 years of typical battery life. Memory supports up to 730,000 measurements with flexible logging modes including fixed interval, burst, and up to 8 user-defined logging intervals. Compatible sensors (sold separately) include the W-CT Conductivity/Temperature sensor, W-CTD Conductivity/Temperature/Depth sensors (available in four depth ranges), and the W-DO Dissolved Oxygen/Temperature sensor. An optional 2-sensor adapter allows two sensors to be connected to a single logger simultaneously.

Looking for a direct read version of this same device? Check out the MX802 here.

Manuals and Resources

User Manuals and Product Guides

HOBO™ MX801 Submersible Data Logger Quick Start Guide

(Size: 0.45 MB)

Specifications

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-CTD Sensor: 36 cm (14") Length with W-CT Sensor: 33 cm (13") Mounting Loop: 1.27 cm x 2.26 cm (0.5" x 0.89")

Accessories

Protective Housing for MX800 Conductivity Data Loggers
HOUSING-1

Special Order

$105.00
- Durable PVC Construction
- Predrilled Holes for Good Water Flow to Sensors
- Includes (3) O-Rings
Compatible with Li-Cor HOBO MX801 and MX802 Data Loggers
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Conductivity Sensor Antifouling Guard
W-GUARD-1

Special Order

$98.00
A Copper Anti-fouling Guard Designed to Slow the BioFoul Growth and Extend the Time Between Sensor Cleanings and Improving Good Water Flow to the Sensor.
- Easy to Install and Remove for Sensor Cleaning
- Held in Place by 2 Rubber O-Rings
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Plug for Unused MX800 Series Data Logger Sensor Inputs
W-PLUG

Special Order

$21.00
- Protective Plug to Seal Unused Sensor Inputs on the MX800 Series Data Loggers
- Weatherproofs the MX802 When Recording Barometric Pressure without an Attached Sensor
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HOBO™ 2-Sensor Adapter for MX800 Series
W-ADAPT-2

Special Order

$304.00
- Monitor Multiple Parameters by Connecting any 2 Sensors (DO, CT or CTD) to a Single MX800 Data Loggers
- Direct Connection or with Cables to Sensors
- Protective Housing Screws On and Off for Easy Access to Sensors
Includes (2) Sets of Couplers, Sensor Bracket, Sensor Guard, Set Screws and Tapered Coupler
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HOBO™ Anti-BioFouling Guard for MX800 Series
W-GUARD-2

Special Order

$129.00
- Copper Guard to Prevent Biofouling
- Attaches to Guard on the W-ADAPT-2 2 in 1 Sensor Adapter
- Extends the Time Between Sensor Cleanings (Slows Growh of Biofouling)
- Slides Over the W-ADAPT-2 Adapter's PVC Sensor Guard
- Secured with 2 Plastic Screws
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FAQs

Customer Questions

Can water level data loggers be used for monitoring both fresh and saltwater environments?

Using Data Loggers in Freshwater and Saltwater Environments Whether you’re monitoring the chill of a deep freshwater lake or the relentless tides of an ocean bay, there are data logger options equipped to thrive. Many robust temperature and depth loggers...

What is the difference between the MX801 and MX802?

The MX801 is fully submersible (IP68, waterproof to 100m with sensor attached) and is deployed directly in the water along with the sensor. The MX802 is designed to remain above the water surface while the sensor is deployed underwater via a cable, allowing...

Can I connect two sensors to one logger at the same time?

Yes. With the optional W-ADAPT-2 2-Sensor Adapter, you can connect any two W-Series sensors (DO, CT, or CTD) to a single MX801 or MX802 logger simultaneously. This allows you to monitor multiple parameters — for example, dissolved oxygen and conductivity...

How is data downloaded from the logger?

Data is downloaded wirelessly via Bluetooth using the HOBOconnect app on a compatible mobile device or Windows computer. For the MX801, the logger must be retrieved from the water to be within Bluetooth range. For the MX802, data can be offloaded without...

How much data can the logger store?

The logger stores up to 730,000 measurements across all active channels (4 MB memory). The number of measurements per channel depends on how many sensors and parameters are being recorded simultaneously.

What logging modes are available?

The logger supports fixed interval logging (normal or statistics), burst logging, and multiple interval logging with up to 8 user-defined logging intervals and durations with pause capability — providing flexibility for a wide range of monitoring applications...

What type of batteries does the logger use and how long do they last?

The logger uses four AA 1.5V lithium batteries, which are user-replaceable in the field. With W-CT or W-CTD sensors at a 1-minute logging interval, battery life is typically 2 years. With the W-DO sensor at a 5-minute logging interval, battery life is...

Are these loggers rated for use in saltwater?

Yes. The logger housing is constructed from PVC with passivated 316 stainless steel hardware, and all wetted materials are rated for use in saltwater environments. The CTD and CT sensors also use passivated 316 stainless steel housings with Viton and...

What is the water depth rating for the MX801?

The MX801 is rated IP68 and waterproof to 100 meters (approximately 328 feet) when a sensor or termination plug is properly attached. The logger is not waterproof if deployed without a sensor attached.

What parameters does the W-DO sensor measure?

The W-DO sensor measures dissolved oxygen concentration and temperature. It is designed for environmental monitoring, watershed research, aquaculture, and water quality compliance applications.

How does battery life differ with the dissolved oxygen sensor compared to conductivity sensors?

The W-DO sensor consumes more power than the W-CT and W-CTD sensors. Typical battery life with the W-DO sensor is approximately 1 year at a 5-minute logging interval, compared to approximately 2 years for the W-CT and W-CTD sensors at a 1-minute interval...

Is there a guard available to protect the sensors from biofouling?

Yes. An optional copper antifouling guard (W-GUARD-1) is available and is designed to slow biofouling growth on the conductivity sensor, extending the time between cleaning intervals while maintaining good water flow to the sensor. It is easy to install...

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