DULCOTEST DO

Summary

Product identification

• Product line: DULCOTEST® sensors for dissolved oxygen
• Models: DO 3-mA, DO 2-mA

Operating limits

DO 3-mA

• Temperature: 0 … 50 °C
• Max. pressure: 2.0 bar
• Supply voltage: 18...30 V DC

DO 2-mA

• Temperature: 0 … 50 °C
• Max. pressure: 1.0 bar
• Supply voltage: 12...30 V DC
• Intake flow: Minimum: 0.05 m/s

Feed water

DO 3-mA

• Measuring principle: Optical (measurement of the relaxation time of a pulsed fluorescence beam)
• Measuring ranges: 0.10…20.0 mg/l (Order no. 1094609)
• Measured variable: Dissolved oxygen
• Calibration: On 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
• Temperature correction: Integrated Pt1000, fed to the outside
• Resistance to: Carbon dioxide (CO₂), hydrogen sulfide (H₂S), sulfur dioxide (SO₂), ethylene oxide, gamma sterilization, contaminated water.
• Interference by: Oxidants (e.g., chlorine, chlorine dioxide, ozone) and organic solvents (e.g., chloroform, toluene, acetone).

DO 2-mA

• Measuring principle: Amperometric, 2 electrodes, membrane-covered, encapsulated transducer integrated in ball float
• Measuring ranges: 0.05…10.0 mg/l (Order no. 1020533)
• Measured variable: Dissolved oxygen
• Calibration: On oxygen or by reference measurement in the process water
• Measuring accuracy: ±0.05 mg/l
• Response time sensor t90: 22 s
• Temperature correction: Not specified (integrated temperature measurement compensates for influence)
• Resistance to: Contaminated water.
• Interference by: Oxidants (e.g., chlorine, chlorine dioxide, ozone), organic solvents (e.g., chloroform, toluene, acetone), and hydrogen sulfide (H₂S).

Product water

DO 3-mA

• Output signal: 4…20 mA assigned to the measuring range, temperature-corrected, calibrated and galvanically isolated.
• Displayed units: [ppm] and [% oxygen saturation] (with compatible measuring and control equipment)

DO 2-mA

• Output signal: 4…20 mA measuring range calibrated, temperature-corrected and electrically isolated.

Electrical

DO 3-mA

• Electrical connection: Fixed cable, 10 m
• Enclosure rating: IP 68

DO 2-mA

• Electrical connection: Fixed lead, 10 m
• Enclosure rating: IP 68

Mechanical / hydraulic

DO 3-mA

• Construction: Rod-shaped
• Process integration:
  • Immersion by immersion pipe (customer-provided PVC, d40/DN 32) using immersion pipe adapter and 45° angle (included).
  • Installation into ProMinent bypass fittings, type DGMa or DLG III (with specific mounting kits).

DO 2-mA

• Process integration: Integrated in a floating ball with a Venturi cleaning function. Supplied with adapter for connection to PVC pipes (outside diameter: 50 mm) and railing bracket.

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Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror