
YSI EXO1 Water Quality Sonde
Instrument Only. Cables, probes/sensors, and accessories sold separately.
- Overview
- Key Benefits
- Smart Sensors
- Specs
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The EXO advanced water quality monitoring platform includes the versatile multiparameter EXO1 sonde for estuarine, surface water, or ground water applications
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Highest Data Quality
Onboard monitoring systems verify sensor operationMultiparameter Monitoring
4 universal ports for allow for any combination of smart sensorsIndustry-leading Anti-fouling
Best-in-class wiper technologyTitanium Components
The toughest grade parts guarantee operation well into the futureSeamless Integration
EXO can plug-and-play into marine, estuarine, freshwater, and groundwater monitoring systems -
Smart Sondes and Sensors
EXO is an extremely versatile instrument, allowing the user to automatically configure a sonde with different sensors for different applications in minutesSmart Sensor Options:
• Conductivity/Temperature
• Dissolved Oxygen
• fDOM
• ISEs (Ammonium, Chloride, and Nitrate)
• NitraLED (UV Nitrate)
• pH (guarded and unguarded)
• pH & ORP (guarded and unguarded)
• Rhodamine
• Total Algae (Chlorophyll + Phycocyanin and Phycoerythrin)
• TurbidityOther Available Parameters
• Absolute Pressure
• Ammonia
• Depth
• DO% Local
• Guage Pressure
• nLF Conductivity
• PAR
• Resistivity
• Salinity
• Specific Conductivity
• Total Dissolved Solids
• Total Suspended Solids
• Water DensityAccuracy
EXO sondes and sensors are tested in a variety of rigorous field conditions as well as lab conditions to ensure accuracy and response times.Monitor without Interruption
No matter which EXO sensors users select, other features of the smart sensor design make them rugged and durable:
• Wet-mateable connectors resist corrosion
• Isolated components prevent short circuits
• Welded housings and double o-rings prevent leaks
• High-impact plastic and titanium resists breaking
• Built-in anti-fouling systems protect data integrity
• Low power consumption extends underwater deployments -
Depth / Pressure Rating / Limit 0 to 250 m (0 to 820 ft) Desktop Software Compatible KOR for EXO Flow Cell Yes Languages English, Spanish, French, Japanese, German, Chinese Logging Capabilities Yes Medium Fresh, sea or polluted water Memory >1,000,000 logged readings, 512 MB total memory Multiparameter Yes Operating Temperature -5 to +50°C Power 2 Alkaline Batteries Sampling Yes Smart Sensors / Ports Yes Storage Temperature -20 to +80°C Unit of Measure Parameter Dependent User Calibratable Yes Waterproof Yes EXO1 Specifications Battery Life 90 days* Communications Computer Interface: Bluetooth wireless technology (between sonde and handheld or computer with KOR software), USB
Output Options: USB with signal output adapter (SOA); RS-232 & SDI-12 with DCP-SOA.Diameter 4.70 cm (1.85 in) Length 64.77 cm (25.50 in) Peripheral Ports 1 power communication port Sample Rate Up to 4 Hz Sensor Ports 4 Warranty: 3 mos Replaceable reagent modules for ammonium, chloride, and nitrate Warranty: 1 yr Optical DO membranes and replaceable reagent modules for pH and pH/ORP Warranty: 2 yrs Cables; sonde bulkheads; handheld; conductivity, temperature, depth, and optical sensors; electronics base for pH, pH/ORP, ammonium, chloride, and nitrate sensors; and accessories Weight 1.42 kg (3.15 lbs) *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.
EXO Parameter Measured Sensor** Range Accuracy Response Resolution Ammonium
(freshwater only)Ammonium Sensor
Ammonia with pH sensor
SKU: 5997100 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,
PhycocyaninTotal Algae Sensor SKU: 599102-010 to 100 μg/L;
0 to 100 RFU;Linearity: R2 >0.999 for serial dilution of Rhodamine WT solution from 0 to 100 μg/mL BGA-PC equivalents T63<2 sec 0.01 μg/L;
0.01 RFUBlue-green Algae,
PhycoerythrinTotal Algae Sensor SKU: 599103-010 to 280 μg/L;
0 to 100 RFU;Linearity: R2 >0.999 for serial dilution of Rhodamine WT solution from 0 to 280 μg/mL BGA-PE equivalents T63<2 sec 0.01 μg/L;
0.01 RFUChloride
(freshwater only)Chloride Sensor
SKU: 5997110 to 18000 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;
0 to 100 RFULinearity: R2 >0.999 for serial dilution of Rhodamine WT solution from 0 to 400 μg/L Chl a equivalents T63<2 sec 0.01 μg/L Chl;
0.01 RFUConductivity1 Conductivity / Temperature Sensor
SKU: 5998700 to 200 mS/cm 0 to 100: ±0.5% of reading or 0.001 mS/cm, w.i.g.;
100 to 200: ±1% of readingT63<2 sec 0.0001 to 0.01 mS/cm (range dependent) Depth - 10 m Integral, Non-vented Depth Sensor3 0 to 10 m
(0 to 33 ft)±0.04% FS (±0.004 m or ±0.013 ft) T63<2 sec 0.001 m (0.001 ft)
(auto-ranging)Depth - 100 m Integral, Non-vented Depth Sensor3 0 to 100 m
(0 to 328 ft)±0.04% FS (±0.04 m or ±0.13 ft) T63<2 sec 0.001 m (0.001 ft)
(auto-ranging)Depth - 250 m Integral, Non-vented Depth Sensor3 0 to 250 m
(0 to 820 ft)±0.04% FS (±0.10 m or ±0.33 ft) T63<2 sec 0.001 m (0.001 ft)
(auto-ranging)Dissolved Oxygen, % air saturation Optical Dissolved Oxygen Sensor
SKU: 599100-010 to 500%
air saturation0 to 200%: ±1% of reading or 1% saturation, w.i.g.;
200 to 500%: ±5% of reading 4T63<5 sec5 0.1% air saturation Dissolved Oxygen, mg/L Optical Dissolved Oxygen Sensor
SKU: 599100-010 to 50 mg/L 0 to 20 mg/L: ±0.1 mg/L or 1% of reading, w.i.g.;
20 to 50 mg/L: ±5% of reading 4T63<5 sec5 0.01 mg/L fDOM
(CDOM)fDOM Sensor
SKU: 599104-010 to 300 ppb Quinine Sulfate equivalents (QSU) Linearity: R2 > 0.999 for serial dilution of 300 ppb QS solution
Detection Limit: 0.07 ppb QSUT63<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
(freshwater only)Nitrate Sensor
SKU: 5997090 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
SKU:599701 guarded, 599702 unguarded
pH/ORP Sensor
SKU:599705 guarded, 599706 unguarded0 to 14 units ±0.1 pH units within ±10˚C of calibration temp;
±0.2 pH units for entire temp range7T63<3 sec8 0.01 units ORP pH/ORP Sensor
SKU:599705 guarded,
599706 unguarded-999 to 999 mV ±20 mV in Redox standard solution T63<5 sec6 0.1 mV Temperature Conductivity / Temperature Sensor
SKU: 599870-5 to 35°C
35 to 50°C±0.01°C2
±0.05°C2T63<1 sec 0.001 °C Turbidity9 Turbidity Sensor
SKU: 599101-010 to 4000 FNU 0 to 999 FNU: 0.3 FNU or ±2% of reading, w.i.g.;
1000 to 4000 FNU: ±5% of reading10T63<2 sec 0 to 999 FNU = 0.01 FNU;
1000 to 4000 FNU = 0.1 FNUSalinity 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 .001 mS/cm, w.i.g. - 0.001, 0.01, 0.1 mS/cm
(auto-scaling)Total Dissolved Solids (TDS) Calculated from Conductivity and Temperature11 0 to 100,000 mg/L
Cal constant range
0.30 to 1.00
(0.64 default)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