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EH Viomax CAS51D digital memosens photometric sensor for optical nitrate or SAC measurement in water, wastewater and utilities. Self-cleaning functionality. IP68.

Part# with Options:        CAS51D-AAA1A2
Price with Options:        Please Email us your request for quote   


(1) Approval for EH CAS51D
Application / Measuring Range
(2) Application / Measuring Range for EH CAS51D
Adaption Cable
(3) Adaption Cable for EH CAS51D
Cable Length
(4) Cable Length for EH CAS51D

  Availability 2 Weeks  ]

Photometric sensor for SAC or nitrate measurement


SAC measurement

  • Organic load in WWTP inlet
  • Organic load WWTP outlet
  • Discharger monitoring
  • Organic load in drinking water

Nitrate measurement

  • Nitrate measurement in natural bodies of water
  • Monitoring nitrate content in WWTP outlet
  • Monitoring nitrate content in aeration basins
  • Monitoring and optimizing denitrification phases
Your benefits
  • Affordable, environmentally friendly product
    • No complicated sampling and treatment
    • Chemical-free measurement
    • Low-maintenance
  • Data conditioning in the sensor
    • Minimum sensitivity to interference during signal transmission
    • Short response time
  • Early, continuous detection of load peaks without delay
  • Ready for use thanks to factory calibration
  • Standardized communication (Memosens technology) enables "plug and play"
  • Very long maintenance intervals thanks to compressed air cleaning
  • Customer calibrations with 1 - 5 points (max.) - in the lab or at place of installation
Measuring principle

The light from a pulsed, high-stability strobe lamp (item 3) passes through the measurement section 1) (item 2). A beam splitter (item 6) directs the light beam to the two receivers (items 1 and 5). A filter upstream from the receivers only lets through light in the measuring wavelength or reference wavelength.

Within the measurement section, the medium in the cuvette (water, dissolved substances and particles) absorbs light across the entire spectrum. In the measuring wavelength range, the measured component 2) takes an additional part of its energy from the light.

The ratio of the light signal of the measuring wavelength to the light signal of the reference wavelength is used to calculate the measured value.

  • If only water and turbidity are present, both signals are attenuated to the same degree and the ratio remains constant.
  • If the medium contains the measured component, the signal of the measuring wavelength is attenuated more and the ratio changes.

This change in the ratio can be converted to determine the nitrate concentration or the SAC value. This dependency is non-linear.

Measuring Principle UV photometric
Characteristic Insitu (immersion in process), extractive with sample and flow cell Optical photometric sensor for nitrate and SAC
Size ca. 390 mm x 40 mm
Design 40 mm sensor, stainless steel stainless steel 316L
Process temperature 5 ... 50C / 41 -120F
Ambient temperature -20 ... 60C / -4 - 140F
Specials G1, NPT3/4 IP68 (1m/3,3ft) water column with 1N KCl during 60d ays
Application Drinking water, biological waste wate process, WWTP effluent
Monitoring of surface water
Measurement range 0,01..10 mg/l / 0,1 ..50 mg/l NO3-N
0,04..80 mg/l / 0,4..200 mg/l NO3
0,1..50 1/m / 0,5..250 1/m / 1,5..700 1/m SAC
0,15..75 mg/l / 0,75..370 mg/l / 2,5..1000 mg/l COD(254nm)
0,06..30 mg/l / 0,3..150 mg/l / 0,9..410 mg/l TOC(254nm)

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