YSI EXO2 Multi-Parameter Water Quality Sonde
Features
- Titanium sensors with wet-mateable, universal sensor ports
- Biofouling protection with central wiper brush and copper-alloy accessories
- Smart QC automatically checks for faults and errors to ensure successful deployments
- Expedited repair and warranty service
- Lifetime technical support
- More
Modern and Efficient Design
The YSI EXO2 represents an advanced sonde platform that offers a wide range of capabilities to those dedicated to monitoring natural aquatic environments such as oceans, estuaries, rivers, lakes, and groundwater. With a highly efficient power management platform, robust construction, and chemistry-free anti-fouling system, The EXO2 allows accurate data collection for up to 90 days between service intervals.
Multi-Port Water Quality Sonde
- Temperature
- Conductivity
- Depth
- Dissolved oxygen
- pH
- ORP
- Total algae (phycocyanin or phycoerythrin along with chlorophyll)
- Turbidity
- Fluorescent dissolved organic matter (fDOM)
- Rhodamine WT
- UV nitrate
- ISE ammonium
- ISE nitrate
- ISE chloride
Outputs Four Calculated Parameters
- Salinity
- Specific conductance
- Total dissolved solids (TDS)
- Total suspended solids (TSS)
Onboard Signal Processing and Memory
All EXO sensors are digital sensors with onboard signal processing and memory. Built-in sensor diagnostic and calibration data allow users to calibrate multiple sensors in one sonde and distribute them to various other sondes in the field. Wet-mateable connectors allow for swaps in wet conditions, while active port monitoring automatically detects each sensor and verifies operation.
EXO2 Specifications
Diameter: 7.62cm (3.00 in)
Length: 71.10cm (28.00 in)
Peripheral Ports: 1 power communication port; 1 auxiliary port for third-party sensors (future functionality; not active yet)
Sensor Ports: 7 (6 ports available when central wiper used)
3-Year Warranty: Sonde; handheld
2-Year Warranty: Cables; conductivity/temperature and optical sensors; electronics base for pH, pH/ORP, ammonium, chloride, and nitrate sensors
1-Year Warranty: Optical DO cap and replaceable reagent modules for pH and pH/ORP sensors
3-Month Warranty: Replaceable reagent modules for ammonium, chloride, and nitrate sensors
Weight: 3.60kg (7.90 lbs)
General Sonde Specifications
Battery Life: 90 days**
Computer Interface: YSIP via USB Signal Output Adapter (SOA) and Bluetooth
Output Options: RS-232 & SDI-12 via DCP-SOA; Modbus & RS-485 via Modbus-SOA
Data Memory: 512 MB total memory; >1,000,000 Logged readings
Depth Rating: 0 to 250m (0 to 820 ft)
Sample Rate: Up to 4 Hz
Operating Temperature: -5 to +50°C (23 to 122°F)
Storage Temperature: -20 to +80°C (-4 to 176°F)
**Typically 90 days at 20˚C at 15-minute logging interval; temperature/conductivity, pH/ORP, DO, and turbidity sensors installed on EXO1; or temperature/conductivity, pH/ORP, DO, total algae, and turbidity sensors installed with central wiper that rotates once per logging interval on EXO2. Battery life is heavily dependent on sensor configuration.
- (1) EXO2 sonde
- (1) Probe guard
- (1) Calibration cup
- (1) Tool kit
- (4) Port plugs
- (4) D-cell alkaline batteries
- (1) USB drive loaded with manual & KOR Software
- YSI EXO Multi-Parameter Water Quality Sonde Brochure
- YSI EXO Multi-Parameter Water Quality Sonde Manual
- YSI EXO Multi-Parameter Water Quality Sonde Quick Start Guide
- YSI EXO Multi-Parameter Water Quality Sonde SmartQC Handbook
- Guide to Monitoring Turbidity at Dredging Sites
- Guide to Monitoring Water Quality on Inland Lakes
In The News
Eyes on Ohio Waters: Water Quality Monitoring in the Huntington District
The world of water quality monitoring is vast and diverse, with environmental professionals working in the field in a variety of environments and applications. From watershed monitoring to source water management , a career in water quality provides opportunities worldwide. 
 
Thaddaeus Tuggle chose to pursue a career in water quality after attending Cedarville University and working closely with the environmental faculty, who instilled in him a passion for working in streams, improving water quality, and educating people about the overall importance of watershed stewardship. 
 
After graduating, Tuggle worked for the Knox Soil &; Water Conservation District in central Ohio before eventually returning to Marshall University in West Virginia.
Read MoreRegional Lake Monitoring in Maine: Community Funded Research and Protection
Lakes everywhere are threatened by climate change, harmful algal blooms , invasive species, and other environmental stressors. Local, regional, and federal agencies have stepped up in order to defend the environment and water resources. The Lakes Environmental Association (LEA) in Maine is one example of an organization dedicated to protecting local freshwater resources. 
 
Dr. Ben Peierls, LEA Research Director, explains the history of the nonprofit, "For more than 50 years, [LEA] has been working locally, statewide, and regionally, helping or interacting with people on lake water quality, watershed protection, conservation, education, invasive species, and other issues.
Read MoreStone Lab: Cyanobacteria Monitoring in Ohio Lakes
Microcystin, one of several toxins produced by the cyanobacteria that form harmful algal blooms (HABs), has become a popular topic of lake research as the human health impacts of HABs become better understood. Stone Lab is one of the leading groups in algal bloom research on Lake Erie and other lakes in Ohio. 
 
For more than 100 years, Stone Lab has conducted biology research and provided science education and outreach to the region. Over the years, thousands of individuals of varying ages have learned from the resources Stone Lab provides. 
 
Stone Lab’s Research Coordinator and Senior Researcher, Justin Chaffin, learned of Stone Lab while an undergraduate student at Bowling Green State University Fireland Campus.
Read More