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DULCOTEST® sensors for dissolved oxygen

Measuring ranges: 0.05 – 10 mg/l and 0.1 – 20 mg/l

Precise measurement of dissolved oxygen with DULCOTEST® sensors – very wide range of applications, from the monitoring of water rich in oxygen, including surface water or potable water, to the reliable control of minimal oxygen concentrations when aerating aeration tanks in clarification plants.

Product description

Reliable online measurement of dissolved oxygen – with DULCOTEST® sensors

The measured variable "dissolved oxygen" indicates the volume of gaseous oxygen physically dissolved in the aqueous phase in mg/l (ppm) or the oxygen saturation of water in %. The new type DO 3 is based on visual measurement of fluorescence and can be connected to the process in an immersion pipe or in a flow fitting. It can be used to monitor water rich in oxygen, such as surface water, potable water as well as for the control of the aeration of aeration tanks in clarification plants.

Your benefits

  • Efficient process management by precise online measurement in real-time
  • A wide range of optimised connections of the sensors to the process
  • Minimal maintenance due to visual measuring principle with type DO 3
  • Maximum measuring sensitivity due to amperometric measuring principle with type DO 2
  • Integrated temperature measurement (Pt 1000) compensates for the influence of temperature
  • Diaphragm-covered electrodes for reduced dependence on flow and cross-sensitivities

Field of application

  • Waste water treatment: Optimisation of the oxygen input into the aeration tank (biological stage) of clarification plants for energy saving
  • Fish farming: Control of oxygen input in water that needs to be treated for aquaculture
  • Potable water supply: Optimisation of the aeration stage in waterworks
  • Environmental technology: Quality assessment of surface water

    Technical Details

    • Measuring accuracy: Type DO 2: ±0.05 mg/l , type DO 3: ±0.1 mg/l
    • Temperature: 0 … 50 °C
    • Max. pressure: Type DO 2: 1 bar, type DO 3: 2 bar
    • Degree of protection: IP 68
    • Supply voltage: Type DO 2: 12 … 30 V DC, type DO 3: 18…30 V DC

    Dissolved oxygen sensor DO 3-mA

    Widely used sensor for the measurement of oxygen dissolved in water above 0.1 ppm to oxygen saturation. For installation in standard immersion pipes or in the bypass line of the process flow. Use in aeration tanks of clarification plants, waterworks, in fish breeding or to monitor surface water. Minimal maintenance due to visual measuring principle.

    Your benefits

    • Measured variable: Dissolved oxygen, minimal maintenance in contaminated water due to visual measuring principle
    • Factory calibration stable for a long time. Calibration only needed following replacement of the visual sensor cap
    • Rod-shaped construction for simple installation into standard immersion pipes and ProMinent bypass fittings
    • No flow dependence and minimised faults due to ingredients in the water due to the visual measuring principle of quenching
    • Long lifetime of fluorescence dye and simple replacement by replacement of the sensor cap
    Measured variableDissolved oxygen
    CalibrationOn atmospheric oxygen or by reference measurement in the process water
    Measuring accuracy±0.1 mg/l
    Response time sensor t90< 60 s at 25 °C from air to nitrogen
    Temperature0 … 50 °C
    Max. pressure2.0 bar
    Intake flow Measurement even possible without flow
    Supply voltage18...30 V DC
    Electrical connectionFixed cable, 10 m
    Output signal4…20 mA Measuring range, calibrated and galvanically isolated
    Enclosure ratingIP 68
    Process integration

    a) Immersion by immersion pipe (PVC, d40/DN 32, provided by the customer). Connection is possible using the immersion pipe adapter and 45° angle (see Accessories).

    b) Installation into ProMinent bypass fittings, types DGMa and DLG III using the corresponding assembly kits (see Accessories)

    Measuring and control equipmentDACb as of firmware 02.01.01.02 with complete calibration functionality and all correction variables. Displayed units: [ppm] and [% oxygen saturation]
    D1C, AEGIS II: can only be calibrated by entering a reference value. Only temperature correction variable. Displayed unit: [ppm]
    Typical applicationsControl of oxygen input into the aeration tank (clarification plant), control of oxygen input in water works, breeding of fish and shrimps, conditioning of the water of large aquaria in zoos, assessment of the biological condition of surface water
    Resistance toContaminated water and the following chemical compounds: carbon dioxide, hydrogen sulfide, sulfur dioxide, ethylene oxide and against gamma sterilisation.
    Interference byOxidant (e.g. chlorine, chlorine dioxide, ozone) and many organic solvents (e.g. chloroform, toluene, acetone)
    Measuring principle, technologyoptical: Measurement of the relaxation time of a pulsed fluorescence beam
    Measuring rangeOrder no.
    DO 3-mA-20 ppm0.10…20.0 mg/l1094609

    Dissolved oxygen sensor DO 2-mA

    Sensor for the measurement of dissolved oxygen, specifically optimised for control of oxygen concentrations in the aeration tank of clarification plants. Integrated in a floating ball with a Venturi cleaning function.

    Your benefits

    • Measured variable: Dissolved oxygen, no interference by turbidity or discolouration by the amperometric measuring principle
    • Integration of the encapsulated transducer into a specially shaped float ball, creating a Venturi flow, which helps to clean the sensor membrane
    • Diaphragm-covered sensor minimises faults caused by changing flow or ingredients in the water
    • Minimal maintenance and long service life due to encapsulated transducer (easily replaceable thanks to bayonet fitting)
    • Measuring electrodes protected by pore-free, dirt-repellent diaphragm
    • Long service life of the electrolyte at low to medium oxygen concentrations, as occur in the aeration tanks of clarification plants, by means of optimised membrane thickness
    • Stable zero point by means of large diaphragm-covered electrodes
    Measured variableDissolved oxygen
    Calibrationeither in atmospheric oxygen or by reference measurement
    Measuring accuracy±0.05 mg/l
    Response time sensor t9022 s
    Temperature0 … 50 °C
    Max. pressure1.0 bar
    Intake flow Minimum: 0.05 m/s
    Supply voltage12...30 V DC
    Electrical connectionFixed lead, 10 m
    Output signal4…20 mA measuring range calibrated, temperature-corrected and electrically isolated
    Enclosure ratingIP 68
    Process integration

    As a float with venturi grooves to increase the flow of sample water for the self-cleaning of the sensor part.

    Supplied with adapter for connection to PVC pipes with outside diameter: 50 mm and railing bracket, also for PVC pipes with outside diameter: 50 mm (see accessories).

    The customer must provide the straight PVC tube and a 45 ° standard elbow for gluing to PVC pipes (outside diameter 50 mm).

    Measuring and control equipmentD1Cb, DAC
    Typical applicationsControl of oxygen input into the aeration tank (clarification plant)
    Resistance toContaminated water
    Interference byOxidant (e.g. chlorine, chlorine dioxide, ozone) and many organic solvents (e.g. chloroform, toluene, acetone) and hydrogen sulfide
    Measuring principle, technologyAmperometric, 2 electrodes, membrane-covered, encapsulated transducer integrated in ball float
    Measuring rangeOrder no.
    DO 2-mA-10 ppm0.05…10.0 mg/l1020533

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    Overview

    Reliable online measurement of dissolved oxygen – with DULCOTEST® sensors

    The measured variable "dissolved oxygen" indicates the volume of gaseous oxygen physically dissolved in the aqueous phase in mg/l (ppm) or the oxygen saturation of water in %. The new type DO 3 is based on visual measurement of fluorescence and can be connected to the process in an immersion pipe or in a flow fitting. It can be used to monitor water rich in oxygen, such as surface water, potable water as well as for the control of the aeration of aeration tanks in clarification plants.

    Your benefits

    • Efficient process management by precise online measurement in real-time
    • A wide range of optimised connections of the sensors to the process
    • Minimal maintenance due to visual measuring principle with type DO 3
    • Maximum measuring sensitivity due to amperometric measuring principle with type DO 2
    • Integrated temperature measurement (Pt 1000) compensates for the influence of temperature
    • Diaphragm-covered electrodes for reduced dependence on flow and cross-sensitivities

    Application

    Technical Data

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    ProMinent Fluid Controls Ltd.


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