Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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user's manual
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.
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
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.)
EXO is an extremely versatile instrument, allowing the user to automatically configure a sonde with different sensors for different applications in minutes
EXO sondes and sensors are tested in a variety of rigorous field conditions as well as lab conditions to ensure accuracy and response times.
No matter which EXO sensors users select, other features of the smart sensor design make them rugged and durable:
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.
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!
| 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 |
| 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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