
Specs at a glance
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Measurement range
0.01 to 20 mg/l / 0.1 to 50 mg/l NO3-N
0.04 to 80 mg/l / 0.4 to 200 mg/l NO3
0 to 50 1/m / 0 to 250 1/m / 0 to 1000 1/m SAC
0 to 75 mg/l / 0 to 375 mg/l / 0 to 1500 mg/l COD/BOD (254nm)
0 to 30 mg/l / 0 to 150 mg/l / 0 to 600 mg/l TOC/DOC (254nm) -
Process temperature
5 to 50°C (41 to 120 °F)
Field of application
Viomax CAS51D is a smart sensor that allows unattended operation in a wide range of process conditions in water, wastewater and utilities. It ensures continuous online measurements without any chemicals and it is extremely robust as well as low-maintenance thanks to its self-cleaning design. You can select the CAS51D as nitrate sensor or as sensor for SAC and several sumparameters. Thanks to Memosens digital technology, Viomax CAS51D offers high process and data integrity and is easy-to-use.
Viomax CAS51D measures nitrate, SAC or several sum parameters in drinking water, process water and wastewater applications as well as in the utilities sector:
Organic load or nitrate in inlet and outlet
Determination of CODeq, TOCeq, BODeq or DOCeq
Monitoring, control and optimization of treatment processes
Nitrate monitoring in the aeration basin and denitrification stage
Benefits
Cost-effective: Easy, chemical-free handling is safe, environmentally friendly and saves on operational expenditure.
Extremely fast response time: Measured value processing in the sensor provides reliable real-time process information.
Fast and easy commissioning: Sensor comes precalibrated and preconfigured ex factory.
Enables unattended plant operation: Intelligent design and automatic air-cleaning functionality maximize availability and minimize maintenance.
Perfect adaption to open basins: Fast and flexible sensor positioning with Flexdip CYH112 holder and CYA112 assembly system.
Perfect adaption to pipes: Various flow cells allow easy plant integration.
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Standard products
- Reliable, robust and low-maintenance
Technical excellence
Simplicity
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Specialized products
- Designed for demanding applications
Technical excellence
Simplicity
Variable
FLEX selections | Technical excellence | Simplicity |
---|---|---|
Fundamental selection Meet your basic measurement needs |
Technical excellence
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Simplicity
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Lean selection Handle your core processes easily |
Technical excellence
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Simplicity
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Extended selection Optimize your processes with innovative technologies |
Technical excellence
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Simplicity
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Xpert selection Master your most challenging applications |
Technical excellence
|
Simplicity
Variable |
Extended selection
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High-end products
- Highly functional and convenient
Technical excellence
Simplicity

Predecessor
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Technical Information (TI)
Viomax CAS51D
Photometric sensor for SAC or nitrate measurement
EN 04/12/202031/07/201930/06/201717/12/201001/05/2010Language:
English
Version:
04/12/2020
File size:
1.4 MB
File name:
TI00459CEN_1620.pdf
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Operating Instruction (BA)
Viomax CAS51D
Photometric sensor for SAC or nitrate measurement
EN 04/12/202031/01/201931/01/201731/12/201001/05/2010Language:
English
Version:
04/12/2020
File size:
2.4 MB
File name:
BA00459CEN_1620.pdf
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Operating Instruction (BA)
Operating Instructions - Compressed air cleaning unit - 115VAC
Operating Instructions - Compressed air cleaning unit - 115VAC
Language:
English
Version:
29/01/2013
File size:
1.8 MB
File name:
BA00498CEN_0113.pdf
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Fields of Activities (FA)
Analyseurs, capteurs in situ et préleveurs
Experts en analyses physico-chimiques
Language:
French
Version:
04/02/2019
File size:
4.6 MB
File name:
FA00012CFR_1918-BM.pdf
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Fields of Activities (FA)
Analizzatori, sensori in loco e campionatori
Esperti nell'analisi dei liquidi
Language:
Italian
Version:
21/03/2017
File size:
26.5 MB
File name:
FA00012CIT_18.17.pdf
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Fields of Activities (FA)
Expertise in liquid analysis
From sensors to complete turnkey solutions
EN 21/09/2022Language:
English
Version:
21/09/2022
File size:
1.2 MB
File name:
FA01018CEN_0422_Analysis_Portfolio_lowres.pdf
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Fields of Activities (FA)
Analyzers, in-situ sensors and samplers
Experts in Liquid Analysis
EN 18/01/2023Language:
English
Version:
18/01/2023
File size:
4.8 MB
File name:
FA00012CEN_Analyzer_20.22_LowRes.pdf
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Fields of Activities (FA)
Esperti nell’analisi dei liquidi
Dai sensori singoli a soluzioni complete “chiavi in mano”
Language:
Italian
Version:
12/01/2017
File size:
3.9 MB
File name:
FA01018CIT_02.16.pdf
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Fields of Activities (FA)
Catálogo Analizadores
Analizadores, sensores y tomamuestras in situ
Language:
Spanish
Version:
21/11/2018
File size:
3.6 MB
File name:
FA00012Ces_Catálogo Analizadores_19.18.pdf
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Fields of Activities (FA)
Analizzatori, sensori in loco e campionatori
Esperti nell'analisi dei liquidi
Language:
Italian
Version:
21/11/2018
File size:
2.8 MB
File name:
FA00012CIT_19.18.pdf
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Fields of Activities (FA)
Catálogo Portfolio Analítica
Desde sensores hasta soluciones completas
Language:
Spanish
Version:
12/01/2017
File size:
1.5 MB
File name:
FA01018CES_Portfolio_Analitica_0216.pdf
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Fields of Activities (FA)
Jistota v analýze kapalin
Od senzorů po kompletní dodávku na klíč
Language:
Czech
Version:
12/01/2017
File size:
740.3 KB
File name:
Analyza_FA01018Ccs_0216.pdf
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Competence Brochure (CP)
For the love of quality water
Fresh ideas for waterworks, distribution networks, surface waters and industrial plants.
Language:
English
Version:
17/06/2019
File size:
3.2 MB
File name:
CP01335CEN_0119_Competence in water.pdf
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Competence Brochure (CP)
Aus Freude an gutem Wasser
Frische Ideen für Wasserwerke, Verteilernetze,Oberflächenwasser und Industrieanlagen
Language:
German
Version:
17/06/2020
File size:
3.2 MB
File name:
CP01335CDE_0119_Kompetenz in Wasser.pdf
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Competence Brochure (CP)
Damit Ihre Kläranlage läuft und läuft und läuft
Effizienz und Effektivität in der Abwasseraufbereitung
Language:
German
Version:
03/08/2018
File size:
3.4 MB
File name:
CP01197CDE_0118_Damit Ihre Kläranlage läuft.pdf
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Competence Brochure (CP)
Making sure your WWTP runs and runs and runs
Efficient and effective wastewater treatment
Language:
English
Version:
03/08/2018
File size:
3.5 MB
File name:
CP01197CEN_0118_Making sure your WWTP runs.pdf
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Case Study (CS)
Water company halves the energy needed for UV application
United Utilities reduces energy use thanks to analytical sensor
Language:
English
Version:
05/10/2017
File size:
2.4 MB
File name:
CS UU approved.pdf
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Case Study (CS)
All around ideally supplied algae
Optimal conditions through holistic liquid analysis
Language:
English
Version:
20/08/2021
File size:
736.7 KB
File name:
CS01720C_0121_All around ideally supplied algae.pdf
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Case Study (CS)
Monitoring water quality in fish farms
Digitalizing fish farming in the Petite Camargue Alsacienne
Language:
English
Version:
24/09/2021
File size:
699.3 KB
File name:
CS01722X_Monitoring water quality in fish farms.pdf
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Case Study (CS)
Pure high quality beer and clean wastewater
Monitoring of effluent with Viomax CAS51D at Heineken
EN 27/10/2022Language:
English
Version:
27/10/2022
File size:
609.3 KB
File name:
CS01762C_Pure high quality beer and clean wastewater_LowRes.pdf
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Case Study (CS)
Überwachung der Wasserqualität in Fischzuchtbecken
Digitalisierung der Fischzucht in der Petite Camargue Alsacienne
Language:
German
Version:
24/09/2021
File size:
706.6 KB
File name:
CS01722X_Ueberwachung der Wasserqualitaet in Fischbecken.pdf
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Case Study (CS)
Rundum ideal versorgte Algen
Optimale Bedingungen durch ganzheitliche Flüssigkeitsanalyse
Language:
German
Version:
20/08/2021
File size:
736 KB
File name:
CS01720C_0121_Rundum ideal versorgte Algen.pdf
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Reagents/standard solutions/cleaner for analyzer
CAY342V10C20AAE (Lithuania)
Standard solution 20 mg/L NO3-N
Language:
Lithuanian
Version:
05/11/2020
File size:
209.7 KB
File name:
MSDS_CAY342V10C20AAE_(LT).pdf
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Reagents/standard solutions/cleaner for analyzer
CAY342V10C20AAE (Malta)
Standard solution 20 mg/L NO3-N
Language:
English
Version:
05/11/2020
File size:
35.8 KB
File name:
MSDS_CAY342V10C20AAE_(M).pdf
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Reagents/standard solutions/cleaner for analyzer
CAY342V10C20AAE (Mexico)
Standard solution 20 mg/L NO3-N
Language:
Spanish
Version:
05/11/2020
File size:
36.6 KB
File name:
MSDS_CAY342V10C20AAE_(MEX).pdf
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Reagents/standard solutions/cleaner for analyzer
CAY342V10C20AAE (China)
Standard solution 20 mg/L NO3-N
Language:
Chinese
Version:
05/11/2020
File size:
205.4 KB
File name:
MSDS_CAY342V10C20AAE_(RC).pdf
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Reagents/standard solutions/cleaner for analyzer
CAY342V10C20AAE (Russia)
Standard solution 20 mg/L NO3-N
Language:
Russian
Version:
05/11/2020
File size:
186.9 KB
File name:
MSDS_CAY342V10C20AAE_(RUS).pdf
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Reagents/standard solutions/cleaner for analyzer
CAY342V10C20AAE (Poland)
Standard solution 20 mg/L NO3-N
Language:
Polish
Version:
05/11/2020
File size:
178.7 KB
File name:
MSDS_CAY342V10C20AAE_(PL).pdf
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Reagents/standard solutions/cleaner for analyzer
CAY342V10C20AAE (Canada)
Standard solution 20 mg/L NO3-N
Language:
English
Version:
05/11/2020
File size:
33.9 KB
File name:
MSDS_CAY342V10C20AAE_(CDN).pdf
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Reagents/standard solutions/cleaner for analyzer
CAY342V10C20AAE (Germany)
Standard solution 20 mg/L NO3-N
Language:
German
Version:
05/11/2020
File size:
38.9 KB
File name:
MSDS_CAY342V10C20AAE_(D).pdf
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