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YSI EXO3 Multiparameter Sonde

Updated:2025-03-13

Brand:YSI
Model：EXO3
Description: EXO Multiparameter Sondes — the best-in-class platform for the highest quality data. EXO's dynamic range of smart sensors provide comprehensive multiparameter water quality data while SmartQC ensures
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Product Details

EXO3 Multiparameter Sonde Introduction：

user's manual

EXO3 multi-parameter probe highlights：

Offering the greatest value of any sonde available on the market, EXO3 combines the maneuverability of the EXO1 with the powerful antifouling wiper of the EXO2.

The EXO advanced water quality monitoring platform includes the versatile multiparameter EXO3 sonde for oceanographic, estuarine, or surface water applications.

EXO3 is a purpose-built sonde for monitoring major water quality parameters, including: pH, conductivity, temperature, turbidity, and dissolved oxygen.

Key Benefits:

Highest Data Quality

Onboard monitoring systems verify sensor operation

Multiparameter Monitoring

5 universal ports for allow for any combination of smart sensors or the central wiper

Industry-leading Anti-fouling

Best-in-class wiper technology

Titanium Components

The toughest grade parts guarantee operation well into the future

Seamless Integration

EXO can plug-and-play into marine, estuarine, freshwater, and groundwater monitoring systems

Additional Benefits Only from EXO3:

The best priced, highest-quality sonde for baseline water quality monitoring.

Flexibility to switch from continuous monitoring to spot sampling with a lighter, shorter form factor.

Integral SDI-12 communications makes it ideal for existing data collection platforms and installations. (Including replacement of 6-Series sondes.)

Integral SDI-12 communications makes it ideal for existing data collection platforms and installations. (Including replacement of 6-Series sondes.)

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 minutes

Smart Sensor Options:

Conductivity/Temperature (wiped and non-wiped)
Dissolved Oxygen
fDOM
ISEs (Ammonium, Chloride, and Nitrate)
pH (guarded and unguarded)
pH & ORP (guarded and unguarded)
NitraLED (UV Nitrate)
Rhodamine
Total Algae (Chlorophyll + Phycocyanin and Phycoerythrin)
Turbidity

Other Available Parameters

Absolute Pressure
Ammonia
Depth
DO% Local
Guage Pressure
nLF Conductivity
PAR
Resistivity
Salinity
Specific Conductivity
Total Dissolved Solids
Total Suspended Solids
Water Density

Accuracy

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

Monitoring Made Mobile

EXO makes it easy to view data in the field. The EXO Handheld offers a dedicated, streamlined interface to EXO sondes. EXO GO uses Bluetooth to connect any Windows OS device to a submerged EXO sonde.

Other EXO Sonde Options

EXO3s Sonde offers the same features as the EXO3, but without the battery compartment
EXO1 Sonde (4 ports) — also available without battery compartment
EXO2 Sonde (7 ports including Central Wiper port) — also available without battery compartment

Add an EXO Factory Service Plan to your next sonde purchase and have the peace of mind that your new instrument is covered. Use today’s budget to protect your investment for years to come!

The EXO sondes are a key component of a complete, unattended long-term water quality monitoring system from our Integrated Systems & Services group.

Learning a new water quality platform can be a challenging process. Accelerate through the learning curve with our on-demand training program. Join us at YSI University!

KorEXO Software makes it easy to manage EXO instrumentation and water quality data. Calibrate sensors, set up long-term deployments, and ensure equipment is operating at peak performance using the traditional Desktop Software or the new Kor Mobile App!

Specifications

Connectivity / Communications	Sonde: Bluetooth wireless technology, RS-485, and integral SDI-12 Output Options with Adapters: USB, RS-232, or Modbus
Depth Rating	0 to 250 m (0 to 820 ft)
Desktop Software Compatible	KorEXO
Flow Cell	Yes
Medium	Fresh, sea or polluted water
Memory	512 MB total memory; >1,000,000 logged readings
Monitoring	Yes
Multiparameter	Yes
Operating Temperature	-5 to 50 °C (23 to 122 °F)
Power	2 Alkaline Batteries
Sampling	Yes
Size	Diameter: 7.62 cm (3.00 in) Length: 58.67 cm (23.1 inc)
Smart Sensors / Ports	5 sensor ports (4 ports available when central wiper in use) Peripheral ports: 1 power communication port
Storage Temperature	-20 to 80 °C (-4 to 176 °F). Exception: 0 to 60 °C (32 to 140 °F) for pH and pH/ORP sensors
User Calibratable	Yes
Waterproof	Yes
Weight	2.00 kg (4.41 lbs) with a full payload of 4 probes, 1 wiper, and probe guard installed

EXO3 Specifications
Battery Life	60 days*
Communications	Computer Interface: Bluetooth wireless technology (between sonde and handheld or computer with KOR software), USB Output Options: SDI-12 (native output), USB with signal output adapter (SOA); & RS-232 with DCP-SOA.
Diameter	7.62 cm (3.00 in)
Length	58.61 cm (23.07 in)
Peripheral Ports	1 power communication port; 1 auxiliary port for third-party sensors (future functionality; not active yet)
Sample Rate	Up to 4 Hz
Sensor Ports	5 (4 ports available when central wiper used)
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
Weight	2.00 kg (4.41 lbs)

Typically 60 days at 20?C at 15-minute logging interval; temperature/conductivity, pH/ORP, DO, total algae, and turbidity sensors installed with central wiper that rotates once per logging interval on EXO3. 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: 599710	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, Phycocyanin	Total Algae Sensor SKU: 599102-01	0 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 RFU
Blue-green Algae, Phycoerythrin	Total Algae Sensor SKU: 599103-01	0 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 RFU
Chloride (freshwater only)	Chloride Sensor SKU: 599711	0 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 SKU: 599102-01, 599103-01	0 to 400 μg/L Chl; 0 to 100 RFU	Linearity: 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 RFU
Conductivity¹	Conductivity / Temperature Sensor SKU: 599870	0 to 200 mS/cm	0 to 100: ±0.5% of reading or 0.001 mS/cm, w.i.g.; 100 to 200: ±1% of reading	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 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: 599100-01	0 to 500% air saturation	0 to 200%: ±1% of reading or 1% saturation, w.i.g.; 200 to 500%: ±5% of reading ⁴	T63<5 sec⁵	0.1% air saturation
Dissolved Oxygen, mg/L	Optical Dissolved Oxygen Sensor SKU: 599100-01	0 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 ⁴	T63<5 sec⁵	0.01 mg/L
fDOM (CDOM)	fDOM Sensor SKU: 599104-01	0 to 300 ppb Quinine Sulfate equivalents (QSU)	Linearity: R2 > 0.999 for serial dilution of 300 ppb QS solution Detection Limit: 0.07 ppb QSU	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 (freshwater only)	Nitrate Sensor SKU: 599709	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 SKU:599701 guarded, 599702 unguarded pH/ORP Sensor SKU:599705 guarded, 599706 unguarded	0 to 14 units	±0.1 pH units within ±10?C of calibration temp; ±0.2 pH units for entire temp range⁷	T63<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°C²	T63<1 sec	0.001 °C
Turbidity⁹	Turbidity Sensor SKU: 599101-01	0 to 4000 FNU, NTU	0 to 999 FNU: 0.3 FNU or ±2% of reading, w.i.g.; 1000 to 4000 FNU: ±5% of reading¹⁰	T63<2 sec	0 to 999 = 0.01 FNU, NTU; 1000 to 4000 = 0.1 FNU, NTU
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 .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

**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 quoted specification. w.i.g. = whichever is greater

EXO sensors are not compatible with YSI 6-Series sondes, sensors, or handheld.

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