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EXO Water Quality Sensors

Sensor* Parameter Range Accuracy Response Resolution
Ammonium
(Ammonia with pH sensor)

Part Number 599710		 Ammonium
(freshwater only)		 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
Barometer
(integral)

 Barometric Pressure
 375 to 825 mmHg ±1.5 mmHg from 0 to 50°C - 0.1 mmHg
Chloride


Part Number 599711		 Chloride
(freshwater only)		 0 to 1000 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
Conductivity / Temperature


Part Number 599870-01		 Conductivity1
 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)
Temperature
 -5 to 35°C
35 to 50°C		 ±0.01°C2
±0.05°C2		 T63<1 sec 0.001 °C
Depth3
(integral; non-vented)

 Shallow
 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)
Medium
 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)
Deep
 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
Optical

Part Number 599100-01		 % air saturation
 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
mg/L
 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)

Part Number 599104-01		 fDOM
 0 to 300 ppb Quinine Sulfate equivalents (QSE) Linearity: R2 > 0.999 for serial dilution of 300 ppb QS solution
Detection Limit: 0.07 ppb QSE		 T63<2 sec 0.01 ppb QSE
Level
(Vented)

Vented Level
 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


Part Number 599709		 Nitrate
(freshwater only)		 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


Part Numbers
599701 guarded
599702 unguarded		 pH
 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
pH/ORP


Part Numbers
599705 guarded
599706 unguarded		 ORP
 -999 to 999 mV ±20 mV in Redox standard solution T63<5 sec6 0.1 mV
pH
 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
Total Algae


Part Number 599102-01		 Blue-green Algae, Phycocyanin
 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
Detection Limit: 0.04 μg/L PC		 T63<2 sec 0.01 μg/L;
0.01 RFU
or Blue-green Algae, Phycoerythrin
To be released in late 2013		 TBD TBD TBD TBD
Chlorophyll
 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
Detection Limit: 0.09 μg/L Chl		 T63<2 sec 0.01 μg/L Chl;
0.01 RFU
Turbidity9


Part Number 599101-01		 Turbidity
 0 to 4000 FNU 0 to 999 FNU: 0.3 FNU or ±2% of reading, w.i.g.;
1000 to 4000 FNU: ±15% of reading10		 T63<2 sec 0 to 999 FNU = 0.01 FNU;
1000 to 4000 FNU = 0.1 FNU
Calculated from Conductivity and Temperature11


 Salinity
 0 to 70 ppt ±1.0% of reading or 0.1 ppt, w.i.g. T63<2 sec 0.01 ppt
Specific Conductance
 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)
 0 to 100,000 g/L
Cal constant range
0.30 to 1.00
(0.64 default)		 Not Specified - Variable
Calculated from Turbidity and user reference samples


 Total Suspended Solids (TSS)
 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 Specification is defined in AMCO-AEPA Standards
11 Values are automatically calculated from conductivity according to algorithms found in Standard Methods for the Examination of Water and Wastewater (Ed. 1989).