Oxymax COS41 is a reliable oxygen sensor for all kinds of water & wastewater applications.

Dissolved oxygen sensor
Oxymax COS41

Amperometric oxygen sensor for water, wastewater and utilities

COS41

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Specs at a glance

Measurement range

0,05 - 20mg/l
Process temperature

max. 50°C
(122°F)
Process pressure

max. 10bar
(145psi)

See all specifications

Field of application

Oxymax COS41 is a reliable and accurate oxygen sensor for all kinds of water & wastewater applications. Designed for reduced maintenance and a long operating life, the sensor offers real value for money.

Oxymax COS41 measures the dissolved oxygen concentration in:

Wastewater treatment plants:
- O₂control 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
Fish farming:
- O₂ control for optimum growth conditions

Benefits

High measurement accuracy
Long maintenance intervals
Minimum calibration effort thanks to simple air calibration

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.

Predecessor

COS4

COS4HD

Success stories

An automated system for pH measurements at AVR

AVR Waste in Botlek, Rotterdam, processes up to 1.7 million tons of residual waste per year. Discover how they optimized their pH measurement thanks to Endress+Hauser
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
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
Monitoring biological parameters in wastewater

Examination of wastewater, using the Liquistation CSF48 and the Liquiport CSP48 mobile, can provide valuable information about the occurrence of Covid 19 infections in a specific area
Read the full story
TOCeq measurement in wastewater treatment

TOC measurements are often performed using analyzers that require expensive reagents. The CAS51D enables the plant operators to comply with WHO requirements and guarantees tight measurement intervals.
Read the full story

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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Search spare parts by number in drawing

- Show drawing (PDF)

60 spare parts & accessories

Kit COSxx Protection cage 8,5 mm holes

further parts

Order code

71495126
Kit COSxx Protection cage Standard

further parts

Order code

71495128
Kit COSxx Protection cage Fish farming

further parts

Order code

71495130
Measuring cable COK41-7

further parts

Order code

51506817
COV45 maintenance kits COS41/COS51x

further parts

Order code

COV45-
Measuring cable COK41-15

further parts

Order code

51506818
Oxymax W COS41

further parts

Order code

COS41-
Zero-point gel COY8

further parts

Order code

COY8-
Junction box VBM

Order code

50003987

Language:	English
Version:	01/03/2007
File size:	385.1 KB
File name:	TI284CEN.pdf

Language:	English
Version:	01/04/2004
File size:	486.9 KB
File name:	Ba284cen.pdf

Language:	English
Version:	01/03/2007
File size:	385.1 KB
File name:	TI284CEN.pdf

Language:	English
Version:	01/04/2004
File size:	486.9 KB
File name:	Ba284cen.pdf

Language:	English
Version:	01/06/2005
File size:	440.8 KB
File name:	KA284CEN.pdf

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

Language:	French
Version:	28/10/2020
File size:	102.9 KB
File name:	MSDS_50053349_(F).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

	EN
01/03/2007
01/06/2001

	EN
01/04/2004
01/05/2001

	EN
01/03/2007
01/06/2001

	EN
01/04/2004
01/05/2001

Dissolved oxygen sensorOxymax COS41

Amperometric oxygen sensor for water, wastewater and utilities

Specs at a glance

Measurement range

Process temperature

Process pressure

Field of application

Benefits

Videos

Predecessor

Success stories

An automated system for pH measurements at AVR

Safe phosphate elimination with minimal effort

Toilet flushing with a fresh sea breeze

Monitoring biological parameters in wastewater

TOCeq measurement in wastewater treatment

Measuring principle

Application

Characteristic

Measurement range

Measuring principle

Design

Material

Dimension

Process temperature

Process pressure

Temperature sensor

Connection

Back

Technical Information Oxymax W COS41

Operating Instructions Oxymax W COS41

Technical Information Oxymax W COS41

Operating Instructions Oxymax W COS41

Brief Operating Instructions Oxymax W COS41

EA Kit COS41/COS51D/E

50053349 (Estonia)

50053349 (France)

50053349 (China)

50053349 (Russia)

50053349 (United Kingdom)

50053349 (India)

Back

Kit COSxx Protection cage 8,5 mm holes

Kit COSxx Protection cage Standard

Kit COSxx Protection cage Fish farming

Measuring cable COK41-7

COV45 maintenance kits COS41/COS51x

Measuring cable COK41-15

Oxymax W COS41

Zero-point gel COY8

Junction box VBM

Dissolved oxygen transmitterLiquisys COM223

Input

Output / communication

Dissolved oxygen transmitter Liquisys COM253

Input

Output / communication

Zero-point gelCOY8

Dissolved oxygen transmitterLiquisys COM223

Input

Output / communication

Dissolved oxygen transmitter Liquisys COM253

Input

Output / communication

Zero-point gelCOY8

Choose from our suggested options

Individual configuration

Often bought together

Dissolved oxygen sensor
Oxymax COS41

Dissolved oxygen transmitter
Liquisys COM223

Dissolved oxygen transmitter
Liquisys COM253

Zero-point gel
COY8

Dissolved oxygen transmitter
Liquisys COM223

Dissolved oxygen transmitter
Liquisys COM253

Zero-point gel
COY8