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Digital ammonium and nitrate sensor ISEmax CAS40D

ISEmax CAS40D - Digital sensor with Memosens technology using the ion-selective measuring principle ©Endress+Hauser
ISEmax CAS40D - Ion-selective ammonium and nitrate sensor with Memosens technology ©Endress+Hauser
ISEmax CAS40D - Single ion-sensitive electrode ©Endress+Hauser

Ion-selective Memosens sensor for the wastewater industry

ISEmax CAS40D is the right technology for trend measurement directly in the basin. It helps you to increase the efficiency and reduce the energy costs of your aeration processes. The sensor works without reagents saving you even further money. With its robust ion-selective membranes and excellent self-cleaning, it eases your maintenance tasks. Thanks to Memosens, CAS40D combines maximum process and data integrity with best operating comfort and simplifies predictive maintenance.

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  • Benefits

    • Nitrate and ammonium measured directly without the need for expensive sample conditioning

    • Optional potassium and/or chloride measurement compensates for cross sensitivities and ensures reliable measuring results

    • Low maintenance thanks to automatic...

  • Field of application

    ISEmax CAS40D measures ammonium, nitrate and pH in municipal wastewater treatment plants:

    • Aeration basins
      - Determination of ammonium and nitrate concentration
      - Control and regulation of ammonium decomposition
      - Load-dependent aeration control for...

Features and specifications



  • Measuring principle

    Potentiometric / ISE

  • Characteristic

    Online measurement of nutrient parameters in
    municipal wastewater treatment plants

    Ion-selective electrode system for the continuous measurement of
    ammonium and nitrate

  • Size

    Diameter: 112 mm (4.41 inch)
    Immersion depth: 510mm (20.08 inch)

  • Design

    Ion-selective electrode(s) for ammonium and/or nitrate, potassium or chloride
    pH - (Reference) electrode

    Ion-selective electrode for compensating cross-interference

    Temperature sensor

  • Process temperature

    2 °C to 40°C (36 to 100 °F)

  • Ambient temperature

    -20 °C to 50 °C (-4 to 120 °F)

  • Process pressure

    400 mbar (160 in H2O) max. permitted overpressure

  • Application

    Wastewater treatment plants

  • Measurement range

    0.1 to 1000 mg/l (NH4-N)
    0.1 to 1000 mg/l (NO3-N)
    1 to 1000 mg/l
    1 to 1000 mg/l

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