Aquaplus

The AquaPlus probe is a combined optical dissolved oxygen, electrical conductivity and temperature sensor. Thanks to the built in conductivity sensor, it 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.

Overview

Standard Parameters:

  • optical DO (Dissolved Oxygen)
  • EC (specific and absolute electric conductivity)
  • TDS (Total Dissolved Solids)
  • Resistivity
  • Salinity
  • SSG (Seawater Specific Gravity)
  • Temperature

The Aquaplus probe has its own 3 meter long cable, which can be extended using standard extension cables, or a version with a longer cable may be ordered instead. Extension cables with in-line connectors are of 5 m, 10m, and 30 m lengths. However, using extension cables the probe can only be lowered to a depth of max. 10 m.

The luminescence based method for measuring dissolved oxygen has the following advantages

  • Very low maintenance
  • No electrolyte to replace
  • No flow of water is required to achieve a steady reading
  • Holds calibration longeró

Optical DO

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 in frequent calibrations (every 3-6 months), and replaceable caps that last over 2 years.

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 in frequent calibrations (every 3-6 months), and replaceable caps that last over 2 years.

Combined DO/EC/Temp sensor

The AquaPlus sensor houses the optical sensor module on the tip, a 4 ring stainless steel conductivity sensor and an embedded temperature sensor.

The inclusion of the EC sensor allows the unit to calculate the salinity and automatically compensate the % saturation reading for salinity effects.

AquaPlus

Electrodes and Specifications

Optional Ion Selective (ISE) electrodes Optional optical electrodes Electrode fitting options for AquaProbe probes
n.a. n.a.

Electrode fitting options for AquaProbe probes


Mechanical Specification
Protection Class IP68 (permanent immersion)
Immersion depth Min. 75 mm; Max. 100 m*
Operating Temperature -5°C ÷ +70°C
Dimensions (L x Dia.) 250 mm x 24 mm
Weight 400 g

*100 m submersion for a period of 1 week; 30 m immersion for permanent deployment.

AquaPlus