The AquaPlus probe is a combined optical dissolved oxygen, electrical conductivity and temperature sensor. Thanks to the built in conductivity sensor, the AquaPlus is able to calculate and automatically compensate DO readings for changes in water salinity. It is compact, robust and highly accurate. It also requires very little maintenance to keep it that way. The slim probe is used with its very own GPS DO meter, meaning the location of every datapoint you measure is also recorded. The optical sensor works on the principle of Dynamic Luminescence Quenching. A gas-permeable material known as a luminophore is excited with short bursts of blue light, which causes molecules in the luminophore to emit red photons. By measuring the delay of the returned red photons with respect to the blue excitation, the level of dissolved oxygen present can be determined. The optical method has various advantages over the historical galvanic method for measuring dissolved oxygen. The most important being that as no oxygen is consumed across a membrane, the sensor does not require a flow of liquid passing over it to achieve a stable reading. Other advantages include infrequent calibrations (every 3-6 months), and replaceable caps that last over 2 years. Readings can logged with standard data loggers or transmitted in real-time using Neon web-based, telemetry data loggers. Readings can also be displayed on the GPS Aquameter.
Water Quality Specifications
Features
Overview
Technical
*100m submersion for period of 1 week, 30m submersion suitable for permanent deployment, depth measurement up to 60m.
Protection Class IP68 (permanent immersion)
Immersion Depth Min 75mm Max 100m*
Operating Temperature -5 ° C – +70°C
Dimensions (L x Dia) 250mm x 24mm
Weight (excluding cable) 400g
The accuracy figures quoted above represent the equipment’s capability at the calibration points at 25°C. These figures do not take into account errors introduced by variations in the accuracy of calibration solutions and errors beyond the control of the manufacturer that may be introduced by environmental conditions in the field.
Dissolved Oxygen % Range 0 – 500.0%
Resolution 0.1%
Accuracy 0 – 200%: ± 1% of reading. 200% – 500%: ± 10%
Dissolved Oxygen mg/l Range 0 – 50.00 mg/L
Resolution 0.01mg/L
Accuracy 0 – 20mg/L: ±1% of reading. 20mg/L – 50mg/L ± 10% of reading
Conductivity (EC) Range 0 – 200 mS/cm (0 – 200,000 µS/cm)
Resolution 3 Auto-range scales: 0 – 9999 µS/cm, 10.00 – 99.99 mS/cm, 100.0 – 200.0mS/cm
Accuracy ± 1% of reading or ± 1µS/cm if greater
TDS Range 0 – 100,000 mg/L (ppm)
Resolution 2 Auto-range scales: 0 – 9999mg/L, 10.00 – 100.00g/L
Accuracy ± 1% of reading or ± 1mg/L if greater
Resistivity Range 5 Ωcm – 1 MΩcm
Resolution 2 Auto-range scales: 5 – 9999 Ωcm, 10.0 – 1000.0 KΩcm
Accuracy ± 1% of reading or ± 1 Ωcm if greater
Salinity Range 0 – 70 PSU / 0 – 70.00 ppt (g/Kg)
Resolution 0.01 PSU / 0.01 ppt
Accuracy ± 1% of reading or ± 0.1 unit if greater
Seawater Specific Gravity Range 0 – 50 σt
Resolution 0.1 σt
Accuracy ± 1.0 σt
Temperature Range -5°C – +50°C (23°F – 122°F)
Resolution 0.1° C/F
Accuracy ± 0.5° C
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