COS51D is a reliable, digital oxygen sensor offering the highest level of measurement accuracy.

Digital oxygen sensor
Oxymax COS51D

Memosens amperometric oxygen sensor for water, wastewater and utilities

COS51D

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Specs at a glance

Measurement range

0.01 to 100 mg/l
0.00 to 1000 %SAT
0 to 2000 hPa
Process temperature

-5 to 50 °C
(20 to 120 °F)
Process pressure

max. 10 bar
(max. 145 psi)

See all specifications

Field of application

Oxymax COS51D is a reliable and highly accurate oxygen sensor for all kinds of water & wastewater applications (including hazardous areas). Designed to be low-maintenance with a long operating life, the sensor offers outstanding value for money. Thanks to Memosens digital technology, the Oxymax COS51D combines maximum process and data integrity with simple operation. It resists corrosion and moisture, enables lab calibration and facilitates predictive maintenance.

Oxymax COS51D measures the dissolved oxygen concentration in:

Wastewater treatment plants:
- O₂ control in the aeration basin
- Process water treatment and monitoring
Water works:
- Status monitoring of drinking water (oxygen enrichment, corrosion protection, etc.)
- Water quality monitoring in rivers, lakes or seas
Utilities of all industries:
- O₂ control in the biological treatment
- Process water treatment and monitoring

The sensor is suitable for hazardous area use (ATEX, FM, CSA).

Benefits

Maximum measurement accuracy
Logging of sensor load data for easy traceability
Intelligent, self-monitoring sensor
Minimum calibration effort thanks to simple air calibration
Long maintenance intervals
Approved for hazardous area use

Videos

The concentration of oxygen dissolved in a liquid can be measured using the amperometric or optical measuring principles. This video shows what it is about and how these measuring principles work.
Memosens converts the measured value to a digital signal and transfers it to the transmitter without a contacting connection. This video shows how Memosens optimizes process control and maintenance.

Extended selection

High-end products
Highly functional and convenient

Technical excellence

Simplicity

What is FLEX?

Simple products
Easy to select, install and operate

Technical excellence

Simplicity

What is FLEX?

Standard products
Reliable, robust and low-maintenance

Technical excellence

Simplicity

What is FLEX?

High-end products
Highly functional and convenient

Technical excellence

Simplicity

What is FLEX?

Specialized products
Designed for demanding applications

Technical excellence

Simplicity

Variable

What is FLEX?

FLEX selections	Technical excellence	Simplicity
F L E X Fundamental selection Meet your basic measurement needs	Technical excellence	Simplicity
F L E X Lean selection Handle your core processes easily	Technical excellence	Simplicity
F L E X Extended selection Optimize your processes with innovative technologies	Technical excellence	Simplicity
F L E X Xpert selection Master your most challenging applications	Technical excellence	Simplicity Variable

Learn more about the FLEX selections

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Predecessor

Oxymax W COS31

Success stories

Conductivity system optimises production of biosurfactants

Holiferm produces sustainable biosurfactants using a patented gravity separation fermentation process. The company was seeking a way to automate the measurement of the critical phase separation step.
Read the full story
Safe phosphate elimination with minimal effort

Thanks to Endress+Hauser the Wastewater treatment plant in Breuberg meets legal requirements and ensures safe phosphate elimination.
Read the full story
Smart vertical farming in big cities

Intuitive pH and conductivity measurement in smart vertical farming plants to meet quality requirements and ensure comprehensive monitoring of processes.
Read the full story
Toilet flushing with a fresh sea breeze

Using seawater to flush toilets can save a lot of drinking water. To ensure a constant water supply, the sensors used must function reliably to meet the water quality objectives (WQO).
Read the full story
Long-lasting performance during whey processing

With the help of the Memosens CPS77E sensor a safe monitoring of the pH values is possible, which must be guaranteed with the high requirements in the food industry.
Read the full story

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Search spare parts by number in drawing

- Show drawing (PDF)

60 spare parts & accessories

Kit COSxx Protection cage Standard

further parts

Order code

71495128
Kit COSxx Protection cage Fish farming

further parts

Order code

71495130
COV45 maintenance kits COS41/COS51x

further parts

Order code

COV45-
Kit COSxx Protection cage 8,5 mm holes

further parts

Order code

71495126
Zero-point gel COY8

further parts

Order code

COY8-
115 VAC 2 output compr.air cleaning unit

Order code

71194623
Cleaning head COS61/61D, 6 or 8mm

Order code

71110801
Cleaning head COS61/61D 1/4"

Order code

71110802
Cleaning unit, 230 V

Order code

71072583
Junction box RM

Order code

51500832
Measuring cable CYK11 Memosens

Order code

CYK11-
Meas. cable CYK10 Memosens

Order code

CYK10-

	EN
21/08/2012
01/03/2010
01/03/2007

Language:	English
Version:	21/08/2012
File size:	562.4 KB
File name:	TI00413CEN_1312.pdf

	EN
21/08/2012
01/03/2010
01/03/2007

Language:	English
Version:	21/08/2012
File size:	562.4 KB
File name:	TI00413CEN_1312.pdf

	EN
21/08/2012
01/10/2008
01/03/2007

Language:	Czech
Version:	12/01/2017
File size:	740.3 KB
File name:	Analyza_FA01018Ccs_0216.pdf

Language:	Italian
Version:	12/01/2017
File size:	3.9 MB
File name:	FA01018CIT_02.16.pdf

Language:	Spanish
Version:	12/01/2017
File size:	1.5 MB
File name:	FA01018CES_Portfolio_Analitica_0216.pdf

Language:	Arabic
Version:	28/10/2020
File size:	221.8 KB
File name:	MSDS_50053349_(AEA).pdf

Language:	French
Version:	28/10/2020
File size:	102.6 KB
File name:	MSDS_50053349_(CHF).pdf

Language:	Dutch
Version:	28/10/2020
File size:	101.5 KB
File name:	MSDS_50053349_(BNL).pdf

Language:	Japanese
Version:	22/11/2022
File size:	405.8 KB
File name:	MSDS_50053349_(J).pdf

Language:	Chinese
Version:	28/10/2020
File size:	291.5 KB
File name:	MSDS_50053349_(RC).pdf

Language:	Russian
Version:	28/10/2020
File size:	301.2 KB
File name:	MSDS_50053349_(RUS).pdf

Language:	Greek
Version:	28/10/2020
File size:	292.3 KB
File name:	MSDS_50053349_(GR).pdf

	EN
31/05/2016
21/08/2012
02/10/2006

	EN
16/07/2012

Language:	Estonian
Version:	28/10/2020
File size:	120.4 KB
File name:	MSDS_50053349_(EST).pdf

Digital oxygen sensorOxymax COS51D

Memosens amperometric oxygen sensor for water, wastewater and utilities

Specs at a glance

Measurement range

Process temperature

Process pressure

Field of application

Benefits

Videos

Extended selection

Predecessor

Success stories

Conductivity system optimises production of biosurfactants

Safe phosphate elimination with minimal effort

Smart vertical farming in big cities

Toilet flushing with a fresh sea breeze

Long-lasting performance during whey processing

Could also interest you

Liquiline: cutting-edge transmitter platform

Memosens 2.0: Cutting-edge sensor technology reloaded

Measuring principle

Application

Characteristic

Measurement range

Measuring principle

Design

Material

Dimension

Process temperature

Process pressure

Connection

Back

Technical Information COS51D

Technical Information COS51D

Operating Instructions Oxymax COS51D

Oxymax COS51D Brief Operating Instructions

Memoclip

Liquiline CM14 DO kit 1

Jistota v analýze kapalin

Esperti nell’analisi dei liquidi

Catálogo Portfolio Analítica

50053349 (India)

50053349 (United Arab Emirates)

50053349 (Switzerland (French))

50053349 (Switzerland (Italian))

50053349 (Belgium (Dutch))

50053349 (Japan)

50053349 (China)

50053349 (Russia)

50053349 (Greece)

50053349 (France)

50053349 (United Kingdom)

50053349 (Estonia)

Back

Kit COSxx Protection cage Standard

Kit COSxx Protection cage Fish farming

COV45 maintenance kits COS41/COS51x

Kit COSxx Protection cage 8,5 mm holes

Zero-point gel COY8

115 VAC 2 output compr.air cleaning unit

Cleaning head COS61/61D, 6 or 8mm

Cleaning head COS61/61D 1/4"

Cleaning unit, 230 V

Junction box RM

Measuring cable CYK11 Memosens

Meas. cable CYK10 Memosens

Input

Output / communication

Ingres protection

Input

Output / communication

Ingres protection

Input

Output / communication

Ingres protection

Input

Output / communication

Ingres protection

Input

Output / communication

Digital oxygen sensor
Oxymax COS51D