Onset, a manufacturer of data loggers, has announced the launch of its new water quality monitoring solution: HOBO MX800 Series Bluetooth Data Loggers.

Featuring a customizable modular platform, HOBO MX800 loggers integrate with interchangeable sensors that measure water conductivity, temperature, depth and dissolved oxygen. With the capacity to support multiple sensors on a single logger, this solution is suited for a variety of monitoring applications, such as coastal research, water quality monitoring, hydrology and wetland mitigation, Onset explained.

Source: Onset

HOBO MX800 loggers feature Bluetooth technology for streamlined logger setup and data offload via a wireless connection to a mobile device or Windows laptop running Onset's free HOBOconnect app. Two logger types are available: An easy-to-deploy, fully submersible model (HOBO MX801) and a direct read model (HOBO MX802) that works with cable-connected sensors, which do not have to be removed from the water for data offload.

Key benefits include:

• Fast data offload to the HOBOconnect app via Bluetooth 5.0
• Guided calibration that ensures accurate data
• Interchangeable sensors, easily swapped out for different applications
• Water detect feature that indicates when logger was out of the water (MX801)
• Direct water level measurements via built-in barometric pressure sensor (MX802)
• User-replaceable batteries, eliminate the need to return loggers for battery replacement

HOBO MX800-compatible sensors currently come in three configurations: conductivity/temperature, conductivity/temperature/depth (CTD) and dissolved oxygen/temperature.

Both the conductivity/temperature and the CTD sensor feature a four-electrode conductivity sensor that provides a wide measurement range (0 to 100,000 uS/cm) and 2% accuracy, with centrally located electrodes to minimize potential measurement errors from nearby stilling wells and housings. When either of these sensors is connected to the logger, it can calculate electrical conductivity, specific conductance, salinity and total dissolved solids (TDS).

Meanwhile, the dissolved oxygen/temperature device is a high accuracy sensor (+/-0.1 mg/L over 0 to 20 mg/L range) with a user-replaceable DO cap that lasts two years or more for long-term deployments.

Further, an optional adapter enables connecting two sensors to one logger, which simplifies deployment and streamlines data management, saving time and money. For example, when combining a dissolved oxygen sensor with a conductivity sensor, the user can log salinity adjusted DO directly, with no need for post-processing.

For more information, visit the Onset website.