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The X2-SDL data logger integrates a temperature and humidity sensor for internal monitoring and diagnostics. It also measures and logs alkaline battery voltage so users can plan for maintenance trips to swap batteries. The logger has three native sensor ports available for external 12 VDC digital sensors including water quality, water level, weather, soil, etc. Two-way and four-way sensor splitters are available to increase the number of sensors that the logger can simultaneously support.

The X2-SDL data logger includes a 6-pin auxiliary power port compatible with the SBP500 submersible battery packs, SP-Series solar power packs, or any user-supplied 5-24 VDC power source.

Rivers, streams and wetlands are the primary deployment locations for the G2-EXO. The system is designed to be pole-mounted on a fixed structure (stream bank, dock, piling, etc.). Flexible parameter options on the EXO sonde platform allow for virtually any type of water quality monitoring applications including harmful algal blooms (HABs), nutrient runoff, dredge turbidity monitoring, dissolved oxygen monitoring, and more.

No, the G2-EXO is a plug-and-play solution for YSI EXO1, EXO2, and EXO3 water quality sondes only. For other instrument integrations, NexSens offers the multi-purpose X2 data logger. The X2 supports nearly all brands of water quality instruments, water level sensors, weather sensors, etc. and can also support Wi-Fi, radio, and Iridium satellite communications.

No, the G2-EXO must be deployed in areas with adequate 4G coverage from Verizon or AT&T in the United States. The AT&T modem is also supported on most cellular carriers in Canada.

While the G2-RAIN can serve most any general rainfall monitoring applications, it is often found on construction sites to alert for rain events and quantify the rainfall. The G2-RAIN is also an effective tool in any stormwater plan and often accompanies water level and/or flood monitoring systems.

The G2-RAIN is designed for low maintenance. Yearly checks are recommended to clear the rain bucket housing of debris.

RS-485 Modbus RTU is a digital communications protocol in which the sensor outputs data. Standardizing how the data is sent from the sensor makes the integration into a data logger or PLC much more straightforward. RS-485 Modbus RTU is an addressable protocol that offers significantly more sensor capacity than other protocols such as SDI-12. This allows the T-Node FR and TS210 temperature strings to accommodate up to 250 sensors along a maximum of 4000 feet of cable. Most data loggers and programmable logic controllers (PLCs) support Modbus.

The T-Node FR is used in a variety of applications from water storage tanks to temperature profiling in lakes and reservoirs. In lakes and reservoirs, temperature strings help identify stratification and lake turnover. They are also used in selective withdrawal dams to determine the optimal location to withdraw water. A single temperature node can be used for basic water or ambient air temperature monitoring.

Dissolved oxygen sensors are frequently added to thermistor strings to help identify hypoxic zones in lakes. A two-way sensor splitter can replace any temperature node in the string and allow for integration of a third party sensor that outputs data over SDI-12 or RS-485 Modbus RTU.

The TS210 is a more affordable and generally more robust temperature string, as the cable is epoxied to both ends of the thermistor in place of connectors. The connectors on either end of the T-Node FR sensor allows the end user to add, remove, and reconfigure the string themselves, making it a more flexible solution.

Temperature strings require minimal maintenance. Remove any bio-fouling with a cloth or soft bristled brush and soapy water. NexSens temperature strings hold their calibration for the life of the sensor, so they do not need to be recalibrated. In the offseason, sensor strings should be stored in a cool, dry place.

NexSens does not recommend deploying the thermistor string in any conditions that pose a risk of freezing, as it is outside of the measurement range and can be detrimental to the sensor. The TS210 accurately reads water temperatures no lower than 32° F (0° C), and the PVC housing can crack and fail from the stress of freezing and thawing.