HOBO MX801-CTD Conductivity, Water Temperature & Depth Data Logger
Bluetooth Logger with Conductivity/Temperature/Depth Sensors
Fully submersible, Bluetooth-enabled MX801 logger with Conductivity, Temperature, Depth (CTD) sensor. Options available for 13, 30, 100 or 250 feet. Freshwater or saltwater.
Communications
Access your data directly from your mobile phone, tablet or Windows computer when within 100 foot (30 m) line-of-sight range of the logger, with the free HOBOconnect app.
To enable cloud data storage and analysis, add an MX Data Plan (select from the options above).
To enable near real-time remote monitoring and alerts via email or text message, add an MX Data Plan and an MX Gateway (select from the options above). Note: the MX Gateway must be indoors.
You can download the HOBOconnect app here:
| Measurements | Conductivity, Water Level, Water Temperature |
|---|---|
| Data Available By | Wireless (Bluetooth/RF), Mobile App |
See the MX800 Page for Data Logger Specifications
See W-CTD Page for conductivity, temperature and depth sensor specifications
FAQs
How can I get a compensated barometric pressure reading?
The MX801 logger records absolute pressure, which is later converted to water level readings by HOBOconnect software. To compensate for barometric pressure changes, you can use a HOBO MX20L Water Level logger, recommend the MX20L-04 for highest accuracy, as a barometric reference. The barometric reference device is typically deployed in the same well or at the same location as the water level of interest, but rather than being placed in the water column, it is deployed above the water in air.
Since barometric pressure readings are consistent across a region (except during fast-moving weather events), you can generally use barometric pressure readings that are taken within 15 km (10 miles) of the logger or more without significantly degrading the accuracy of the compensation. This means you only need to use one MX20L logger as a barometric reference for any loggers within this range.
- HOBO MX801 data logger
- Coupler
- Conductivity/Temperature/Depth (CTD) Sensor
- 3/32” Allen wrench
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Overview
This fully assembled data logger is ready to deploy for monitoring conductivity, salinity, and depth (CTD) while still offering the flexibility to add further parameters like dissolved oxygen (DO) using the 2-sensor adapter. Also calculating specific conductance, salinity, and total dissolved solids (TDS), this logger records absolute pressure, which is later converted to water level readings by HOBOconnect software.
To compensate for barometric pressure changes, you can use a HOBO MX20L Water Level logger as a barometric reference.
The fully submersible, Bluetooth-enabled MX801 multi-parameter data logger is highly accurate and easy to deploy. Complete with simple setup and data offloading using a wireless connection to a compatible mobile device or Windows computer using the free HOBOconnect app. Learn more.
Key Features
- 4-electrode conductivity sensor provides wide measurement range for monitoring freshwater or saltwater
- Conductivity sensor is centrally located to minimise effects from stilling wells or protective guards
- Durable ceramic water level sensor, located in the sensor tip for accurate measurement of shallow water levels
- Temperature sensor placement near the sensor tip for fast response time
- Bluetooth, for easy logger configuration and data offload
- Specially treated stainless steel holds up in saltwater
- Logger diameter 1 inch for use in narrow wells
- User-replaceable batteries.
Requires the free HOBOconnect mobile app (available from iTunes and Google Play).