Page 28: of Marine Technology Magazine (November 2012)

Monitoring EXO1 SondeSmart Ports: 4 Peripheral port: 1 Size: Diameter: 4.70 cm (1.85 in) Length: 64.77 cm (25.50 in) Weight 1.65 kg (3.63 lbs) EXO2 SondeSmart Ports: 7 Peripheral ports: 2 Size: Diameter: 7.62 cm (3.00 in) Length: 71.10 cm (28.00 in) Weight 2.65 kg (5.83 lbs) SensorsBlue-green Algae Phycocyanin Range: 0 to 100
«g/L PC; 0 to 100 RFU Linearity: R2 > 0.999 Detection Limit: 0.04
«g/L PCResponse: T63<2 sec Resolution: 0.01
«g/L PC; 0.01 RFU Chlorophyll Range: 0 to 400
«g/L Chl; 0 to 100 RFU Linearity: R2 > 0.999Detection Limit: 0.09
«g/L ChlResponse: T63<2 sec Resolution: 0.01
«g/L Chl; 0.01 RFU Conductivity Range: 0 to 200 mS/cm Resolution: 0 to 100: ±0.5% of reading or 0.001 mS/cm.; 100 to 200: ±1% of read- ingResponse: T63<2 sec Resolution: 0.0001 to 0.01 mS/cm Depth (non-vented) Range: 0 to 250 m Accuracy: ±0.04% FS (±0.10 m) Response: T63<2 sec Resolution: 0.001 m Dissolved Oxygen-Optical Range: 0 to 500% air saturation Accuracy: 0 to 200%: ±1% of reading or 1% saturation; 200 to 500%: ±5% of readingResolution: 0.1% air saturation Range: 0 to 50 mg/L Accuracy: 0 to 20 mg/L: ±0.1 mg/L or 1% of reading; 20 to 50 mg/L: ±5% of read- ingResolution: 0.01 mg/L Response: T63<5 sec fDOMRange: 0 to 300 ppb Quinine Sulfate equivalents (QSE) Linearity: R2 > 0.999Detection Limit: 0.07 ppb QSE Resolution: T63<2 sec Accuracy: 0.01 ppb QSE ORP Range: -999 to 999 mV Accuracy: ±20 mV in Redox standard so- lutions Response: T63<5 sec Resolution: 0.1 mV pH Range: 0 to 14 units Accuracy: ±0.1 pH units within ±10 ûC of calibration temp; ±0.2 pH units for entire temp range Response: T63<3 sec Resolution: 0.01 units Temperature Range: -5 to 50°C Accuracy: -5 to 35°C: ±0.01°C; 35 to 50°C: ±0.05°CResponse: T63<1 sec Resolution: 0.001 °C Turbidity Range: 0 to 4000 FNU Accuracy: 0 to 999 FNU: 0.3 FNU or ±2% of reading; 1000a to 4000 FNU: ±5% of readingResponse: T63<2 sec Resolution: 0 to 999 FNU: 0.01 FNU; 1000 to 4000 FNU: 0.1 FNU Calculated parameters: Salinity, Speci Þ c Conductance, Total Dissolved Solids, and Total Suspended Solids. Complete sensor specs can be found at www.EXOwater.com EXO Water Quality Monitoring Platform Speci Þ cationscorrosion when wet. Moisture and dampness are ever-pres- ent when deploying and swapping instruments in the Þ eld. However, robust Impulse connectors (aluminum-bronze alloy plated in gold) provide superior corrosion resistance, even if the user drops the instrument with an exposed four-pin sensor connector directly in the water. Tight Seals Are Leak-proof Laser-welded joints on the sensors plus double O-ring seals prevent leaks in all water environments, from shallow to deep. All parts go through rigorous pressure/temperature testing be-fore they leave the factory. Other tough components include exclusively designed Neoprene and urethane rubber shields on the connectors.Sapphire glass on optical sensor windows is hard and du- rable and bonds well to metal for a tight seal on the probe face. The material is optically clear for the wavelengths used by EXO sensors and it wonÕt interfere or ß uoresce. The sap- phire glassÕs smooth surface also resists biofouling and stands up well to regular sweeps from the anti-fouling wiper system. Anti-fouling Makes a Clean Sweep Built-in antifouling systems protect the integrity of the wa- ter quality data when the equipment is submerged in highly productive waters. A central wiper with a large brush on the EXO2 actively sweeps away fouling organisms from the sen- sors before the organisms get a foothold. This wiper has low power requirements, an optimal design for continuous moni- toring. Where the sensors connect to the instrument body, EXO uses blended copper-brass alloy components to resist biofouling build-up. Copper is a passive anti-fouling agent and does not use harmful chemicals to clear biofouling. On the body of the instrument, Xenoy is well-suited for rigorous cleaning, such as scraping off barnacles, and can be taped or painted with common anti-fouling paint without Òcrazing,Ó or cracking over time. 28 MTRNovember/December 2012MTR #9 (18-33).indd 28MTR #9 (18-33).indd 2811/29/2012 11:14:51 AM11/29/2012 11:14:51 AM