DISSOLVED OXYGEN
Brochure Link (See pages 10 and 11)
Membrane
Measurement principle
The oxygen content in liquids is best measured with cells using Clark's principle. These cells generate an electrical current proportional to the oxygen partial pressure which can be evaluated with a suitable measurement converter. In order to prevent interference effects, the Clark's cell is covered with a gas-permeable membrane. The PTFE membranes typically used, however, are mechanically very fragile, with the result that they must be frequently changed to allow reliable measurement. It is difficult to handle such fragile membranes. As a solution, S423 use the OPTIFLOW membrane. This membrane is very mechanically stable and is manufactured as a laminate around a steel mesh. OPTIFLOW membranes are stable under harsh ambient conditions as well as high pressures. This ingenious design allows fast response times to be combined with unusually low flow dependence. In addition to the PG 13.5 versions with their various lengths, they are now also available as 25 mm versions. The S423/OXYSENS sensors have been developed as 100% maintenance-free, low cost sensors for water management and fish farming.
Maintenance free
No membrane or electrolyte substitution is requested. Replace the sensor if it can no longer be calibrated.
Range
• 0 ÷ 20,0 ppm or mg/l - 0 ÷ 200% SAT
• Resolution0,1 ppm o mg/l - 1% SAT
Avaiable versions with double parameter:
• 4238-83[pH/ORP - Dissolved Oxygen]
• 4262-83[Turbidity - Dissolved Oxygen]
• 4263-83[Suspended Solids - Dissolved Oxygen]
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Optical
Optical Technology
The S423/N/OPT sensor with an integrated temperature sensor is based on optical measure: a diode emitting blue light is directed to an oxygen light-sensitive layer. The sensitive material reacts emitting a red light (luminescence) which emission depends on oxygen concentration This innovative method assures reliable, precise and driftless measures, calibration is no longer necessary. Without consumable, calibration and maintenance, the S423/N/OPT sensor leads to a rapid return on investment. Only the DOdisk is to be changed once every two years. Oxygen-free consumption, the S423/N/OPT sensor is adapted to any fields, including those with very low water circulation.
Digital Technology
Disruption-resistant : Integrated preamplification and digital treatment of signals. The optical sensor saves its calibration data for better measures management. All data concerning calibration, history, users and measures are directly treated within the S423/N/OPT sensor and transmitted via RS-485.
Physical characteristics
Compact, robust and light, the stainless steel sensor allows a handheld or fixed unit application.
Advantages
• Optical technology No membrane no electrolyte
• No drift : no calibration
• Digital output : Modbus RS-485
• Stainless steel body : rugged
Applications
• Urban wastewater treatment (network control, entrance, aeration pool for the nitrification / denitrificationprocess)
• Industrial effluent treatment
• Surface water monitoring
• Fish farming
• Drinking water
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