YSI EXO 1 Multiparameter Sonde
The EXO1 is a rugged, high-performance multiparameter water quality sonde designed for unattended, long-term monitoring across a wide range of environments. Built for reliability and flexibility, the EXO1 delivers exceptional data quality and seamless integration with monitoring systems for continuous field deployment.
Featuring four universal sensor ports, an optional depth sensor, and a lightweight compact design, the EXO1 is ideal for applications where portability, durability, and dependable data are essential.
Please Note: The EXO features uses internal batteries and is therefore suitable for unattended deployment. For telemetry deployments or portable use please consider the EXO1S
Built for Long-Term Reliability
Engineered for harsh environments, the EXO1 combines corrosion-resistant titanium construction with rigorous testing to ensure dependable operation in demanding field conditions. Its low power consumption and large internal memory support autonomous deployments for over three months.
Key durability features include:
Corrosion-resistant titanium sensors and bulkhead
Fully sealed, laser-welded titanium sensors and wiper
Wet-mate neoprene connectors for easy deployment
High-impact, temperature-resistant housing
Pressure-rated to depths of 250 metres
Mechanically and electrically isolated internal components
Backed by a 3-year warranty
Simplified Operation & Seamless Integration
The EXO platform is designed to streamline setup and deployment with intuitive operation and advanced smart features. Universal sensor ports allow quick configuration, while automatic sensor recognition and guided calibration simplify field preparation.
With support for the rugged EXO Handheld or the Kor Mobile App, users can view live data and manage deployments directly from their device.
Key operational benefits include:
Universal sensor compatibility
Automatic sensor recognition
Guided calibrations
SmartQC™ quality assurance
Fast integration with remote monitoring systems
Real-time data access via handheld or mobile app
Comprehensive Water Quality Monitoring
The EXO1 supports a wide range of water quality parameters, delivering critical insights for environmental monitoring and compliance.
Supported parameters include:
Temperature
Conductivity / Specific Conductivity / NLF Conductivity
Salinity
Resistivity
Total Dissolved Solids (TDS)
Water Density
Dissolved Oxygen (DO)
Local DO
pH
ORP
Turbidity
Total Suspended Solids (TSS)
fDOM
Total Algae (Chlorophyll, Phycocyanin, Phycoerythrin)
ISE Ammonium / Ammonia / Chloride / Nitrate
UV Nitrate
Rhodamine WT
Depth
Vertical Position
Absolute Pressure
Suitable Applications
The EXO1 is designed for deployment across a broad range of water monitoring applications, including:
Surface water monitoring (rivers, lakes, streams)
Coastal, estuarine, and marine environments
Source and drinking water
Stormwater systems
Groundwater monitoring
Aquaculture
Wastewater treatment
Industrial and urban water systems
With unmatched durability, advanced sensor technology, and flexible deployment options, the EXO1 is a trusted solution for accurate, long-term water quality monitoring.
Depth Rating | 250 m (820 ft) | |
Materials | Xenoy®, Lexan®, titanium, 316 stainless steel | |
Internal Logging Memory Capacity | >1,000,000 logged readings, 512 MB memory | |
Software | Kor Software | |
Application | Kor Desktop, Kor Mobile | |
Power Requirements | Internal: 9 - 16 VDC External: (2) D-cell alkaline batteries | |
Battery Life | 90 days* | |
Communications | Sonde: Bluetooth (Wireless); RS-485 (Field Cable) | |
Operating Temperature | -5 to 50°C (23 to 122°F) | |
Storage Temperature | -20 to 80°C (-4 to 176°F) | |
Diameter | 4.70 cm (1.85 in) | |
Length | 64.53 cm (25.40 in) | |
Weight | 1.42 kg (3.13 lbs) | |
Peripheral Ports | 1 power communication port | |
Sample Rate | Up to 4 Hz | |
Sensor Ports | 4 | |
Waterproof | Yes | |
User Calibration | Yes | |
Languages | English, Spanish, French, Japanese, German, Chinese | |
Warranty: 3 yrs | Sonde; handheld | |
Warranty: 2 yrs | Cables; conductivity/temperature and optical sensors; electronics base for pH, pH/ORP, ammonium, chloride, and nitrate sensors | |
Warranty: 1 yr | Optical DO cap and replaceable reagent modules for pH and pH/ORP sensors | |
Warranty: 3 mos | Replaceable reagent modules for ammonium, chloride, and nitrate sensors | |
*Typically 90 days at 20˚C at 15-minute logging interval; temperature/conductivity, pH/ORP, DO, and turbidity sensors installed on EXO1. Battery life is heavily dependent on sensor configuration.
Ammonium | Ammonium Sensor | 0 to 200 mg/L (0 to 30˚C) | ±10% of reading or ±2 mg/L-N, w.i.g. | T63<30 sec | 0.01 mg/L |
Barometric Pressure | Integral Barometer | 375 to 825 mmHg | ±1.5 mmHg from 0 to 50°C | - | 0.1 mmHg |
Blue-green Algae, | Total Algae Sensor SKU: 599102-01 | 0 to 100 μg/L; | Linearity: r2 >0.999 for serial dilution of Rhodamine WT solution across full range | T63<2 sec | 0.01 μg/L; |
Blue-green Algae, | Total Algae Sensor SKU: 599103-01 | 0 to 280 μg/L; | Linearity: r2 >0.999 for serial dilution of Rhodamine WT solution across full range | T63<2 sec | 0.01 μg/L; |
Chloride | Chloride Sensor | 0 to 1,000 mg/L-Cl (0 to 30˚C) | ±15% of reading or ±5 mg/L-Cl, w.i.g. | T63<30 sec | 0.01 mg/L |
Chlorophyll | Total Algae Sensor | 0 to 400 μg/L Chl; | Linearity: r2 >0.999 for serial dilution of Rhodamine WT solution across full range | T63<2 sec | 0.01 μg/L Chl; |
Conductivity1 | Conductivity / Temperature Sensor | 0 to 200 mS/cm | 0 to 100: ±0.5% of reading or 0.001 mS/cm, w.i.g.; | T63<2 sec | 0.0001 to 0.01 mS/cm (range dependent) |
Depth - 10 m | Integral, Non-vented Depth Sensor3 | 0 to 10 m | ±0.04% FS (±0.004 m or ±0.013 ft) | T63<2 sec | 0.001 m (0.001 ft) |
Depth - 100 m | Integral, Non-vented Depth Sensor3 | 0 to 100 m | ±0.04% FS (±0.04 m or ±0.13 ft) | T63<2 sec | 0.001 m (0.001 ft) |
Depth - 250 m | Integral, Non-vented Depth Sensor3 | 0 to 250 m | ±0.04% FS (±0.10 m or ±0.33 ft) | T63<2 sec | 0.001 m (0.001 ft) |
Dissolved Oxygen, % air saturation | Optical Dissolved Oxygen Sensor | 0 to 500% | 0 to 200%: ±1% of reading or 1% saturation, w.i.g.; | T63<5 sec5 | 0.1% air saturation |
Dissolved Oxygen, mg/L | Optical Dissolved Oxygen Sensor | 0 to 50 mg/L | 0 to 20 mg/L: ±0.1 mg/L or 1% of reading, w.i.g.; | T63<5 sec5 | 0.01 mg/L |
fDOM | fDOM Sensor | 0 to 300 ppb Quinine Sulfate equivalents (QSU) | Linearity: r2 > 0.999 for serial dilution of 300 ppb QS solution | T63<2 sec | 0.01 ppb QSU |
Level, Vented - 10 m | Integral Vented Level Sensor | 0 to 10 m (0 to 33 ft) | ±0.03% FS (±0.003 m or ±0.010 ft) | T63<2 sec | 0.001 m (0.001 ft) |
Nitrate | Nitrate Sensor | 0 to 200 mg/L-N (0 to 30˚C) | ±10% of reading or ±2 mg/L-N, w.i.g. | T63<30 sec | 0.01 mg/L |
pH | pH Sensor | 0 to 14 units | ±0.1 pH units within ±10˚C of calibration temperature; | T63<3 sec8 | 0.01 units |
ORP | pH/ORP Sensor | -999 to 999 mV | ±20 mV in Redox standard solution | T63<5 sec6 | 0.1 mV |
Temperature | Conductivity / Temperature Sensor | -5 to 50°C | -5 to 35°C: ±0.01°C2 | T63<1 sec | 0.001 °C |
Turbidity9 | Turbidity Sensor | 0 to 4000 FNU | 0 to 999 FNU: 0.3 FNU or ±2% of reading, w.i.g.; | T63<2 sec | 0 to 999 FNU: 0.01 FNU; |
Salinity | Calculated from Conductivity and Temperature11 | 0 to 70 ppt | ±1.0% of reading or 0.1 ppt, w.i.g. | T63<2 sec | 0.01 ppt |
Specific Conductance | Calculated from Conductivity and Temperature11 | 0 to 200 mS/cm | ±0.5% of reading or 0.001 mS/cm, w.i.g. | - | 0.001, 0.01, 0.1 mS/cm |
Total Dissolved Solids (TDS) | Calculated from Conductivity and Temperature11 | 0 to 100,000 mg/L | Not Specified | - | Variable |
Total Suspended Solids (TSS) | Calculated from Turbidity and user reference samples | 0 to 1500 mg/L | Not specified | T63<2 sec | Variable |
**Specifications indicate typical performance and are subject to change. All sensors have a depth rating to 250 m (820 ft), except shallow and medium depth sensors, ammonium, chloride, and nitrate. Accuracy specification is attained immediately following calibration under controlled and stable environmental conditions. Performance in the natural environment may vary from the quoted specification.
w.i.g. = whichever is greater
EXO sensors are not compatible with YSI 6-Series sondes, sensors or handheld.
1Outputs of specific conductance (conductivity corrected to 25˚C) and total dissolved solids are also provided. See Calculated Parameters and footnote 11.
2 Temperature accuracy traceable to NIST standards
3Accuracy specifications apply to conductivity levels of 0 to 100,000 μS/cm.
4 Relative to calibration gases
5 When transferred from air-saturated water to stirred deaerated water
6 When transferred from water-saturated air to Zobell solution
7Within the environmental pH range of pH 4 to pH 10.
8On transfer from water-saturated air to rapidly stirred air-saturated water at a specific conductance of 800 μS/cm at 20˚C; T63<5 seconds on transfer from water-saturated air to slowly-stirred air-saturated water.
9 Calibration: 1-, 2-, or 3-point, user-selectable
10 Performance based on 3-point calibration done with YSI AMCO-AEPA standards of 0, 124, and 1010 FNU. The same type of standard must be used for all calibration points.
11 Values are automatically calculated from conductivity according to algorithms found in Standard Methods for the Examination of Water and Wastewater (Ed. 1989).
Xenoy is a trademark of SABIC Innovative Plastics IP BV.
EXO Bluetooth modules comply with Part 15C of FCC Rules and have FCC, CE Mark, and C-tick approval. Bluetooth-type approvals and regulations can be country-specific. Check local laws and regulations to ensure that the use of wireless products purchased from Xylem is in full compliance.