Specs at a glance
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Measuring range
0.01 to 100 mg/l
0.00 to 1000 %SAT
0 to 2000 hPa -
Process temperature
-5 to 60 °C
(20 to 140 °F) -
Process pressure
Max. 5 bar abs
(Max. 72.5 psi abs)
Field of application
Memosens COS51E is perfectly suited for all wastewater and utility applications including hazardous areas. The sensor is highly accurate and moisture-resistant ensuring the safety of your processes. COS51E features Memosens 2.0 digital technology. It is able to store more calibration and process data and thus provides the perfect basis for predictive maintenance and IIoT services. Designed to be low-maintenance with a long operating life, the sensor offers outstanding value for money.
Memosens COS51E measures the dissolved oxygen concentration in:
Wastewater treatment plants:
- O2 control in the aeration basin
- Process water treatment and monitoringUtilities of all industries:
- O2 control in the biological treatment
- Process water treatment and monitoringWater works:
- Status monitoring of drinking water (oxygen enrichment, corrosion protection, etc.)
- Water quality monitoring in rivers, lakes or seas
The sensor is suitable for hazardous area use (ATEX, FM, CSA).
Benefits
Wide measuring range: The amperometric measuring principle and cathode design make the sensor suitable for all wastewater applications from industrial to municipal plants.
High accuracy: Thanks to its amperometric, three-electrode design, the sensor provides long-term stable measurement with low drift.
Increased plant availability: Memosens technology and Liquiline transmitters enable plug & play for fast commissioning and sensor exchange.
Non-contact, inductive signal transmission ensures maximum process integrity.
Memosens 2.0 digital technology makes the sensor ready for predictive maintenance and IIoT services since it offers extended storage of calibration and process data.
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Specialized products
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Technical excellence
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| FLEX selections | Technical excellence | Simplicity |
|---|---|---|
Fundamental selection Meet your basic measurement needs |
Technical excellence
|
Simplicity
|
Lean selection Handle your core processes easily |
Technical excellence
|
Simplicity
|
Extended selection Optimize your processes with innovative technologies |
Technical excellence
|
Simplicity
|
Xpert selection Master your most challenging applications |
Technical excellence
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Simplicity
Variable |
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Miscellaneous
Product family: Absorbance, Cell growth, Isemax, Liquiport, Liquistation M, Memosens, New analyzer platform, OxyMax W, Spectrometer, Turbidity and total suspended solids, Turbimax, UV
Russian version - 03/2025
Product root: CA80AL-, CA80AM-, CA80COD-, CA80CR-, CA80FE-, CA80HA-, CA80NO-, CA80PH-, CA80SI-, CA80TN-, CA80TP-, CAS40D-, CAS80E-, COS22E-, COS41-, COS51E-, COS61-, COS61D-, COS81E-, CSF48-, CSP44-, CUS50D-, CUS51D-, CUS52D-, OUSAF11-, OUSAF12-, OUSAF21-, OUSAF22 -, OUSAF46-, OUSBT66-, OUSTF10- Region: Eurasian Economic Union Approval agency: T-Standard Approval number: ЕАЭС KZ 7500525.13.12.00620
Language:
Russian
Version:
27/03/2025
File size:
1.3 MB
File name:
EAC KZ 7500525.13.12.00620.pdf
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Technical Information (TI)
TI Memosens COS51E
English version - 10/2025
Amperometric oxygen sensor for water, wastewater and utilities
EN 28/10/202508/02/202207/10/2021Language:
English
Version:
28/10/2025
File size:
1.3 MB
File name:
TI01620CEN_0325-00.pdf
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92 documents
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Technical Information (TI)
TI Memosens COS51E
Amperometric oxygen sensor for water, wastewater and utilities
EN 28/10/202508/02/202207/10/2021Language:
English
Version:
28/10/2025
File size:
1.3 MB
File name:
TI01620CEN_0325-00.pdf
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Operating Instruction (BA)
BA Memosens COS51E
Amperometric oxygen sensor with Memosens 2.0 technology
EN 28/10/202508/02/202207/10/2021Language:
English
Version:
28/10/2025
File size:
1.7 MB
File name:
BA02146CEN_0325-00.pdf
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Short Instruction (KA)
Memosens COS51E
Amperometric oxygen sensor with Memosens 2.0 technology
EN 07/10/2021Language:
English
Version:
07/10/2021
File size:
613.6 KB
File name:
KA01542CEN_0121.pdf
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Installation Instructions (EA)
EA Kit COS41/COS51D/E
for maintenance of the Oxymax W COS41/COS51D and Memosens COS51E oxygen
sensorsEN 05/05/2023Language:
English
Version:
05/05/2023
File size:
636.5 KB
File name:
EA01476CEN_0123-00.pdf
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Ex Safety Instruction (XA)
XA Memosens oxygen sensors
NEPSI Ex ia IIC T6/ T4 Ga
Safety instructions for electrical apparatus in explosion-hazardous areasEN 09/02/202615/03/2023Language:
English
Version:
09/02/2026
File size:
591.6 KB
File name:
XA03110CEN_0226-00.pdf
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Ex Safety Instruction (XA)
Memosens COS22E Memosens COS51E
Supplement to BA02145C
Supplement to BA02146C
Safety instructions for electrical apparatus in explosion-hazardous
areasEN 17/11/2021Language:
English
Version:
17/11/2021
File size:
504.9 KB
File name:
XA02752CEN_0121-00.pdf
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Ex Safety Instruction (XA)
Memosens COS22E Memosens COS51E
EAC Ex 0Ex ia IIC T6 … T4 Ga X
Safety instructions for electrical apparatus in explosion-hazardous
areasEN 11/05/2022Language:
English
Version:
11/05/2022
File size:
420.1 KB
File name:
XA02840CEN_0121-00.pdf
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Ex Safety Instruction (XA)
XA Memosens COS22E Memosens COS51E
EAC Ex 0Ex ia IIC T6 … T4 Ga X
Safety instructions for electrical apparatus in explosion-hazardous areasEN 30/07/2025Language:
English
Version:
30/07/2025
File size:
488.9 KB
File name:
XA03638CEN_0125-00.pdf
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Ex Safety Instruction (XA)
Memosens COS22E Memosens COS51E
KOR Ex ia IIC T6… T4 Ga
Safety instructions for electrical apparatus in explosion-hazardous
areasEN 18/03/2022Language:
English
Version:
18/03/2022
File size:
420.2 KB
File name:
XA02791CEN_0121-00.pdf
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Ex Safety Instruction (XA)
XA Memosens COS22E Memosens COS51E
Supplement to BA02145C
Supplement to BA02146C
Safety instructions for electrical apparatus in explosion-hazardous areasEN 14/01/2025Language:
English
Version:
14/01/2025
File size:
501.7 KB
File name:
XA03502CEN_0124-00.pdf
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