Dissolved oxygen sensors DULCOTEST

Precise measurement of dissolved oxygen with DULCOTEST sensors:

Wide range of applications, from the monitoring of oxygen-rich waters such as surface water or drinking water to the reliable regulation of small oxygen concentrations in the aeration of treatment plant activation tanks.

Available models:

Code Manufacturer’s code Description
P_161387 1094609 Dissolved Oxygen Sensor – DO3 – mA Range 0.10 – 20ppm / 1 – 200%, Maximum pressure –

Dissolved oxygen sensors

The measured variable “dissolved oxygen” indicates the amount of gaseous oxygen physically dissolved in the aqueous phase in mg/l (ppm) or the oxygen saturation of the water in %. The new DO3 type is based on optical fluorescence measurements and can be connected to the process with dip tubes or flow tubes. It can be used to control more oxygen-rich water, such as surface water and drinking water, and to regulate the aeration of activation tanks in treatment plants.

Applications

  • Wastewater treatment: optimizes the oxygen input in the activation tank of water treatment plants, which helps to save energy.
  • Fish farming: regulates the entry of oxygen into waters to be conditioned for animal husbandry
  • Drinking water supply: aeration optimization in water supply plants
  • Environmental engineering: assessment of surface water quality

Technical information

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

DO 3-mA dissolved oxygen sensor

Magnitude of measurement
Dissolved oxygen
Calibration
In air oxygen or by reference measurement in process water
Measurement Accuracy
±0.1 mg/l
Reaction time as t 90
< 60 s at 25 °C air to nitrogen
Temperature
0 … 50 °C
Temperature correction
Pt1000 integrated, externally driven
Max. pressure
2.0 bar
Flow rate
Measurement possible even without flow rate
Supply voltage
18…30 VCD
Electrical connection
fixed cable 10 m
Output signal
4…20 mA associated with the measuring range, temperature-corrected, calibrated and galvanically separated
Type of protection
IP 68
Installation
a) Immersion by means of immersion pipe (PVC, d40/ DN 32, provided by the customer). The connection can be made using the dip tube adapter (reducing nipple, Cat. No. 356924) and the 45° elbow (Cat. No. 356335). Both components are included in the standard package and can be ordered as accessories (see also the accessories section).

b) Installation on the ProMinent bypass fitting, type DGMa with mounting kit 791818 and type DLG III with mounting kit 815079

Measuring and control instruments
DACb from firmware 02.01.01.02 with full calibration functionality and all correction quantities (temperature, salinity, atmospheric pressure, height above sea level). Units displayed:[ppm] and [% oxygen saturation].
DACa, AEGIS II, D1C:calibration only with introduction of a reference concentration determined from the process water. Temperature correction magnitude only. Unit displayed: [ppm]
Typical Application
Control of oxygen inlet to the activation tank (treatment plant), control of oxygen inlet in water supply plants, fish and shrimp farms, water conditioning of large aquariums in zoos, evaluation of the biological state of surface waters.
Resistant to
Dirty water and the following chemical compounds: carbon dioxide, hydrogen sulfide, sulfur dioxide, ethylene oxide, and gamma ray sterilization.
Disturbance from
Oxidizers (e.g., chlorine, chlorine dioxide, ozone) and some organic solvents, (e.g., chloroform, toluene and acetone)
Measuring principle, technology
Optical: Measurement of the time it takes for pulses of fluorescent radiation to return

DO 2-mA dissolved oxygen sensor

Magnitude of measurement
Dissolved oxygen
Calibration
in oxygen in the air or by reference measurement in the process water
Measurement Accuracy
±0.05 mg/l
Reaction time as t 90
22 s
Temperature
0 … 50 °C
Temperature correction
Max. pressure
1.0 bar
Flow rate
minimum 0.05 m/s
Supply voltage
12…30 VCD
Electrical connection
fixed cable 10 m
Output signal
4…20 mA Calibrated, temperature-corrected and galvanically isolated measuring range
Type of protection
IP 68
Installation
Floating ball with venturi grooves to increase flow for self-cleaning of the sensor part.

Delivery includes the adapter for connection to PVC pipes with outer diameter: 50 mm and the rail bracket also for PVC pipes with outer diameter: 50 mm (see accessories).

The customer must install the straight PVC pipe and a standard 45º elbow to be glued with the PVC pipes (outer diameter 50 mm).

Measuring and control instruments
D1C, DAC
Typical Application
Control of oxygen inlet in the activation tank (treatment plant).
Resistant to
Dirty water
Disturbance from
Oxidants (e.g., chlorine, chlorine dioxide, ozone) and some organic solvents (e.g., chloroform, toluene and acetone), as well as hydrogen sulfide.
Measuring principle, technology
amperometric, 2 electrodes, with diaphragm, encapsulated and integrated floating ball measuring value recorder