EXO2 Multiparameter Sonde

High-Quality Data Sonde for Unattended Monitoring

EXO Multiparameter Sondes are a versatile and rugged water quality monitoring solution, offering exceptional data quality, unmatched reliability for extended deployments, and seamless integration with any monitoring system.

• Overview

  

  Unmatched reliability
  Durable titanium components and rigorous testing ensure high accuracy in extreme environments

  Powerful anti-fouling wiper
  High torque sensor wiper with dense bristles enables long-term, uncompromised data collection

  Data at your fingertips
  View live field data for a wide range of parameters with the rugged EXO Handheld or the Kor Mobile App on your device

  Intuitive operation
  Simplify workflow with universal sensor ports, automatic sensor recognition, guided calibrations, and SmartQC^TM for quality assurance

  Autonomous deployments
  Operates independently for over 3 months with a large internal memory, low power draw, and anti-fouling capabilities

  Seamless integration
  Easily configure your system in minutes for remote real-time data access

  

  The data is in the details

  • Wet-mate neoprene connectors on sonde, sensors and cables
  • Completely sealed, laser-welded titanium sensors and wiper
  • Mechanically and electrically isolated sonde components
  • High-impact, temperature-resistant housing
  • Corrosion-resistant titanium sensors and bulkhead
  • Pressure-rated to 250 meters depth
  • Patented anti-fouling technology
  • Protected by a 3-year warranty

  Essential parameters. Vital insights.

  • Temperature
  • Conductivity
  • Specific Conductivity
  • Salinity
  • Resistivity
  • Total Dissolved Solids (TDS)
  • Water Density
  • Dissolved Oxygen (DO)
  • Local DO

  • pH
  • Oxidation-Reduction Potential (ORP)
  • Turbidity
  • Total Suspended Solids (TSS)
  • Fluorescent Dissolved Organic Matter (fDOM)
  • Total Algae - Chlorophyll & Phycocyanin
  • Total Algae - Chlorophyll & Phycoerythrin

  • ISE Ammonium
  • ISE Ammonia
  • ISE Chloride
  • ISE Nitrate
  • Rhodamine WT
  • Photosynthetically Active Radiation (PAR)
  • Depth
  • Vertical Position
  • Absolute Pressure

  

  Use EXO Sondes in a variety of environments:

  • Surface Water: Rivers, Lakes, Streams
  • Ocean, Coastal, Estuaries
  • Source & Drinking Water
  • Stormwater

  • Groundwater
  • Aquaculture
  • Wastewater
  • Industrial & Urban

  Other EXO Sonde Options

  • EXO1 Sonde (4 ports) - also available without a battery compartment: EXO1s
  • EXO2 Sonde (7 ports including Central Wiper port) - also available without a battery compartment: EXO2s
  • EXO3 Sonde (5 ports including Central Wiper port) - also available without a battery compartment: EXO3s

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  EXO University is your on-demand video resource that provides step-by-step expert guidance, proven best practices, and standardized workflows empowering you to collect accurate, reliable data in no time!

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  Easily configure your EXO Sonde, calibrate sensors, set up deployments, and manage water quality data using Kor^TM desktop software or mobile app.

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  Enhance your water monitoring program by combining EXO with a custom solution from our Integrated Systems and Services team. Seamlessly transmit your data with HydroRIG and view it in real-time with HydroSphere

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  Add an EXO Factory Service Plan to your next sonde purchase, and know that your new instrument is covered. Protect your investment for years to come!

• Specifications

  EXO2 Specifications
  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: (4) D-cell alkaline batteries
  Battery Life	90 days*
  Communications	Sonde: Bluetooth (Wireless); RS-485 (Field Cable) Adapters: RS-232, Modbus, USB, SDI-12
  Operating Temperature	-5 to 50°C (23 to 122°F)
  Storage Temperature	-20 to 80°C (-4 to 176°F)
  Diameter	7.62 cm (3.00 in)
  Length	70.52 cm (27.76 in)
  Weight	3.60 kg (7.94 lbs)
  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	7 (6 ports available when central wiper used)
  Anti-Fouling	With a central wiper occupying a sensor port
  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 a 15-minute logging interval; temperature/conductivity, pH/ORP, DO, total algae, and turbidity sensors installed with a central wiper that rotates once per logging interval on EXO2. 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-N (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 across full range	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 acriss full range	T63<2 sec	0.01 μg/L; 0.01 RFU
  Chloride (freshwater only)	Chloride Sensor SKU: 599711	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 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 across full range	T63<2 sec	0.01 μg/L Chl; 0.01 RFU
  Conductivity1	Wiped Conductivity / Temperature Sensor SKU: 599827	0 to 100 mS/cm	±1% of reading or 2 µS/cm, w.i.g	T95<30 sec	0.001 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: 0.1 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 temperature; ±0.2 pH units for entire temperature 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	Wiped Conductivity / Temperature Sensor SKU: 599827	-5 to 50°C	±0.2°C2	T95<30 sec	0.001 °C
  Turbidity9	Turbidity Sensor SKU: 599101-01	0 to 4000 FNU	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 FNU: 0.01 FNU 1000 to 4000 FNU: 0.1 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 (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.
  
  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 insure that the use of wireless products purchased from Xylem are in full compliance.

• Accessories

  

  EXO GO

  Wireless communication device for the EXO sondes.

  

  EXO Handheld Display

  Enhanced interface for calibrating and data logging with the EXO platform

  

  EXO Wiped Conductivity & Temperature Sensor

  EXO Wiped Conductivity & Temperature Digital Smart Sensor

  

  EXO Optical Dissolved Oxygen Smart Sensor

  EXO Optical Dissolved Oxygen Digital Smart Sensor

  

  EXO pH Smart Sensor

  EXO pH Digital Smart Sensor (Unguarded)

  

  EXO pH & ORP Smart Sensor

  EXO pH & ORP Digital Smart Sensor (Unguarded)

  

  EXO Turbidity Smart Sensor

  EXO Turbidity Digital Smart Sensor

  

  EXO Central Wiper

  Anti-fouling Wiper for the EXO2 and EXO3 Platforms

  

  EXO Total Algae PC Smart Sensor

  EXO Total Algae Phycocyanin Digital Smart Sensor - Freshwater

  

  EXO Total Algae PE Smart Sensor

  EXO Total Algae Phycoerythrin Digital Smart Sensor - Saltwater

  

  EXO NitraLED UV Nitrate Sensor

  EXO NitraLED UV Nitrate Sensor for Freshwater Environments

  

  EXO fDOM Smart Sensor

  EXO Fluorescent Dissolved Organic Matter Digital Smart Sensor

  

  EXO Ammonium Smart Sensor

  EXO Ammonium Digital Smart Sensor (ISE)

  

  EXO Nitrate Smart Sensor

  EXO Nitrate Digital Smart Sensor (ISE)

  

  EXO Chloride Smart Sensor

  EXO Chloride Digital Smart Sensor (ISE)

  

  EXO Rhodamine Sensor

  EXO Rhodamine Digital Smart Sensor

  

  EXO Signal Output Adapter - USB

  

  EXO DCP Signal Output Adapter 2.0

  For integrating a data logger and telemetry system with an EXO sonde.

  

  EXO Modbus Signal Output Adapter

  For integrating an EXO Sonde into a SCADA system.

  

  EXO Flying Lead Cable

  Connects EXO Sonde to DCP Signal Output Adapter

  

  EXO Vented Flying Lead Cable

  Connects EXO Sonde to DCP Signal Output Adapter in Vented Applications

  

  EXO Field Cable

  Field Cable

  

  EXO Dissolved Oxygen Sensor Cap Replacement Kit

  Replaceable DO Sensor Cap

  

  EXO Central Wiper Brush Kit

  Replacement Wiper

  

  EXO Wiper Brush Guard Replacement Kit

  Replacement guards for EXO2 central wiper

  

  EXO pH Sensor Replacement Module

  Unguarded pH Module

  

  EXO pH & ORP Sensor Replacement Module

  Unguarded pH/ORP Module

  

  EXO Ammonium Sensor Replacement Module

  Shallow Freshwater Only

  

  EXO Nitrate Sensor Replacement Module

  Shallow Freshwater Only

  

  EXO Chloride Sensor Replacement Module

  Shallow Freshwater Only

  

  EXO Cable Couplers

  Brass or Titanium

  

  EXO Anti-fouling C/T Screen

  Copper probe screen

  

  EXO2 / EXO3 Anti-Fouling Guard

  Copper-alloy guard

  

  EXO Probe and Sonde Protective Sleeves

  Anti-fouling sleeves

  

  Anti-Fouling Copper Tape

  Copper tape provides biofouling protection

  

  Anti-Fouling C-Spray

  Non-Toxic Biofouling Inhibitor

  

  EXO2 / EXO3 Hard Sided Wheeled Carrying Case

  Hard Sided Wheeled Carrying Case

  

  EXO2 / EXO3 Calibration and Storage Cup

  Replacement Cup

  

  EXO2 / EXO3 Sonde Weight Kit

  Profiling Accessory

  

  EXO2 / EXO3 Flow Cell

  

  EXO2 / EXO3 Replacement Bail

  Replacement Bail

  

  EXO 4-Pin Bulkhead Connector Port Plug

  

  EXO Tool Kit

  Replacement Tool Kit

  

  EXO Conductivity & Temperature Sensor Cleaning Brush

  Flow Cell Brush

  

  EXO2 / EXO3 Replacement O-Ring Kit

  

  Kor Software - USB Drive

  Software

  

  EXO Sensor Retaining Nut Kit, Titanium

  Replacement sensor retaining nuts

  

  EXO Central Wiper Retaining Nut Kit, Titanium

  EXO Central Wiper Retaining Nut Replacement Kit, Titanium 

  

  EXO2 / EXO3 Guard Assembly Kit

  EXO2 / EXO3 Probe Guard

  

  EXO Replacement 6-Pin Dummy Plug Kit, Female

  

  EXO2 Replacement 6-Pin Dummy Plug Kit, Male

  

  EXO Replacement Sensor Tool & Magnet Kit

  Replacement Tools

  

  Krytox® Lubricant

  O-Ring grease

  

  Desiccant Canister Kit

  

  EXO NitraLED Wiper Brush Kit

  Wiper brush for EXO NitraLED UV Nitrate Sensor

  

  Turbidity Standard

  Turbidity Standard

  

  pH Buffer

  pH Buffer

  

  Conductivity Calibrator Solution

  Conductivity Calibrator Solution

  

  NitraLED Calibration Standard

  Calibration Standard for EXO NitraLED UV Nitrate Sensor

  

  Ammonium Standard

  Ammonium Calibration Solution

  

  Nitrate Standard

  Nitrate Standard

• Software

  Kor Software - v1.4.1.10
  Oct 2024

  Kor Software is designed to interface with both EXO and ProDIGITAL (DSS) instruments, including the new ProSwap Logger. Use Kor Software to view live data, import/export recorded data, calibrate sensors, manage handheld settings, set up deployments, and more! This software is included on a USB flash drive that ships with all new instruments, and the latest version can be found here on the website.

  Use with the following instruments:

  • EXO Sondes
  • ProSwap Loggers
  • ProSwap Handhelds
  • ProSolo Handhelds
  • ProDSS Handhelds

  Functions:

  • Calibrate Sensors
  • View and Record Live Data
  • Download and View Recorded Data
  • Set Up Deployments
  • Configure Handheld Settings
  • Adjust Instrument and Sensor Settings

  What's New:

  Kor Software replaces both KorEXO and KorDSS as the primary user interface for managing EXO and ProDIGITAL (ProSwap, ProSolo, and ProDSS) instruments and data.

  Note: Be sure to update instrument firmware before attempting to download data.

  Software Change Notes [PDF]

  Download Kor Software

• Firmware

  EXO Firmware Update Package - v5.5.0.0
  Apr 2024

  If you've experienced problems with automatically downloading the latest firmware versions for your EXO equipment using KOR Software, you can attempt a manual update using this firmware package. This will update the EXO Sonde to version 1.0.86.

  EXO Firmware Update Instructions [PDF]

  EXO Firmware Change Notes [PDF]

  Download EXO Firmware

• Application Notes
  • NYC Monitors Source Waters with YSI Buoys | A507
  • Dubai Municipality Utilizes Real-time Water Quality Monitoring Instruments | A526-02
  • Thames Water Employs Reservoir Profiler to Reduce Costs
  • Using Real-time Telemetry for Ecological Monitoring of Coastal Wetlands | A578
  • EXO Total Algae Sensor | A606
  • Watching the Watershed | A611
  • Sellafield and EXO, Monitoring Nuclear Waste | A613
  • Using On-line Monitoring of Cyanobacteria in Source Water Treatment | A618
  • Stormwater Monitoring Network and TMDL's in South Carlolina | A622
  • The Advantages of Continuous Monitoring in Christchurch Harbor
  • Continuous Monitoring of Water Utilities in the UK Using the EXO Ammonium ISE | XA00358
  • Determining the Source of Stream Toxins | XA00182 French
  • UK Environment Act | Guide to Monitoring the Impact of Storm Overflow | XA00261
  • Determining the Source of Stream Toxins | XA00182
• Blog Posts
  • Cleaning your water quality field instruments
  • Storing for the season | Water quality field instruments
  • Case Studies in Compliance | Environment Act 2021 Monitoring with the EXO Sonde
  • The True Cost of Data | What’s Below the Surface?
  • Understanding the Tijuana River Estuary
  • Long-term Continuous Monitoring of Zambezi River Demonstrates Massive Swings in Carbon Releases
  • Top Maintenance Tips for EXO Sondes | Protect Your Investment
  • Bayou Sorrell | An Unexpected Bonus with EXO Sondes
• Brochures and Catalogs
  • Aquaculture Applications Parameters & Capabilities | W25-10
  • EXO Calibration Worksheet | XA00288
  • EXO Factory Service Plan Brochure | E104
  • HydroMet Brochure | D86-04
  • Municipal Water Catalog | W35-04
• FAQs
  • FAQs Dissolved Oxygen Measurement
• Guides
  • SmartQC Handbook | E135
  • EXO Long Term Deployment Tube Guide
  • YSI Field Kit Guide | XA00180
  • Environmental Solutions Guide | XA00240
  • YSI Solution Expiration Dates
  • YSI Optical Dissolved Oxygen Sensor Cap Guide | W33
• Infographics
  • Surface Water Algae Infographic
• Manuals
  • 603789 | EXO User Manual | English
• News Briefs
  • USC EXO fDOM Assessment | NB16
• Specification Sheets
  • 10 Tips to Prevent Bio Fouling on Water Quality Instruments
  • YSI EXO Sonde Platform Specification Sheet | XA00243
• Technical Notes
  • Dissolved Oxygen Solubility Table | XA00055
  • Successful deployments with the EXO Ammonium ISE | XA00360
  • Environmental Dissolved Oxygen Values Above 100 Percent Air Saturation
  • The Basics of Chlorophyll Measurement