TI00387C/07/EN/14.18
71411045
2018-07-17
Products
Solutions Services
Technical Information
Oxymax COS61D/COS61
Measurement of dissolved oxygen
Digital optical sensor based on the principle of
fluorescence quenching, with or without
Memosens protocol
Application
• Wastewater treatment plants
– Oxygen measurement and regulation in the activated sludge basin for a highly
efficient biological cleaning process
– Monitoring the oxygen content in the wastewater treatment plant outlet
• Water monitoring
Oxygen measurement in rivers, lakes or seas as an indicator of the water quality
• Water treatment
Oxygen measurement for status monitoring, e.g. of drinking water (oxygen
enrichment, corrosion protection etc.)
• Fish farming
Oxygen measurement and regulation for optimum living and growth conditions
Your benefits
• Optical technology:
– Minimum maintenance
– Maximum availability
• Sensor with digital signal processing:
– Calibration data saved in sensor
– High degree of EMC protection thanks to digital communication with the
transmitter
• Extended maintenance intervals and a high degree of longterm stability
• Intelligent self-monitoring guarantees reliable measured values
• No flow needed - measurement possible in still water
• COS61D - the Liquiline sensor
– Plug&Play: Safe communication based on Memosens protocol
– Optionally with M12 plug for fast connection to the transmitter
• COS61 - the Liquisys sensor
– Compatible with tried-and-tested COS31 with COM2x3W: Easy measuring point
changeover to optical technology
– Compatible with COS41 with COM2x3D with conversion kit
Function and system design
Oxymax COS61D/COS61
Measuring principle
Sensor structure
Oxygen-sensitive molecules (markers) are integrated into an optically active layer (fluorescence
layer).
The fluorescence layer, an optical insulating layer and a cover layer are applied on top of one another
on a carrier. The cover layer is in direct contact with the medium.
The sensor optics are directed at the rear of the carrier and therefore at the fluorescence layer.
Measurement process (principle of quenching)
If the sensor is immersed in the medium, an equilibrium is very quickly established between the
oxygen partial pressure in both the medium and the fluorescence layer.
1. The sensor optics send green light pulses to the fluorescence layer.
2. The markers "respond" (fluoresce) with red light pulses.
The duration and intensity of the response signals are directly dependent on the oxygen
contents and oxygen partial pressure.
If the medium is free from oxygen, the response signals are long and very intense.
Oxygen molecules mask the marker molecules. As a result, the response signals are shorter and less
intense.
Measurement result
The sensor returns a signal that is proportional to the oxygen concentration in the medium.
‣
The medium temperature and air pressure are already taken into account to calculate the oxygen
concentration in the sensor.
The sensor provides measured values for temperature and partial pressure as well as a raw measured
value. This value corresponds to the fluorescence decay time and is approx. 20 μs in air and
approx. 60 μs in oxygen-free media.
For optimum measurement results
1. During calibration, enter the current air pressure at the transmitter.
2. In the case of saline media:
Enter the salinity.
3. For measurements in the units %Vol or %SAT:
Also enter the current operating pressure in the measuring mode.
• Operating Instructions for Memosens, BA01245C
For all transmitters, analyzers and samplers in the Liquiline CM44x/P/R, Liquiline System
CA80XX and Liquistation CSFxx product families
• Operating Instructions for Liquisys COM2x3, BA00199C
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Oxymax COS61D/COS61
1 2
3
4
5
6
Measuring system
COS61D
A complete measuring system consists of the following components at least:
• Oxymax COS61D oxygen sensor
• Liquiline CM44x multi-channel transmitter
• Sensor cable, optionally available with M12 connector
• Assembly, e.g. flow assembly COA250, immersion assembly CYA112 or
retractable assembly COA451
Optionally:
• Assembly holder Flexdip CYH112 for immersion operation
• Extension cable CYK11
• Cleaning system
1 Example of a measuring system with COS61D
1
Sensor cable
2
Liquiline CM44x
3
Flexdip CYH112
A0012882
4
Basin rim with railing
5
Oxymax COS61D
6
FlexdipCYA112
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COS61
1 2
3
4
5
6
A complete measuring system comprises:
• Oxymax COS61 oxygen sensor
• Transmitter, e.g. Liquisys COM2x3-W
• Sensor cable
• Assembly, e.g. flow assembly COA250, immersion assembly CYA112 or
retractable assembly COA451
Optionally:
• Flexdip CYH112 assembly holder for immersion operation
• VS junction box (for cable extension)
• Cleaning system
Oxymax COS61D/COS61
2 Example of a measuring system with COS61
1
Liquisys COM253
2
Oxymax COS61
3
Pipe (ascending pipe)
Input
Measured values
Measuring ranges
Dissolved oxygen [mg/l, µg/l, ppm, ppb or %SAT or hPa]
Measuring ranges apply for 25 ˚C (77 ˚F) and 1013 hPa (15 psi)
With Liquiline CM44x, CM44xR, CM44P or with Liquisys COM2x3-W:
• 0 to 20 mg/l
• 0 to 400 hPa
• 0 to 200 % SAT
A0012885
4
Direction of medium flow
5
Cleanfit COA451
6
Sensor cable
4 Endress+Hauser
Oxymax COS61D/COS61
GN
PK
GY
YE
COM A
COM B
U
+
U
–
Power supply
Electrical connection
COS61D
Connection data
• Sensor cable connected directly to the terminal connector of the basic module
• Optional: sensor cable plug connected to the M12 sensor socket of the transmitter
With this type of connection, the transmitter is already wired at the factory.
3 Sensor fixed cable with terminated cable cores
COS61 to field device
You connect the sensor directly to the transmitter via the special measuring cable with SXP
connector.
4 SXP connector
Response time
COS61 to cabinet device
Terminal
COM223
87 YE +U
0 GN 0 V WH 0 V
96 PK Communication (digital) GN Communication (digital)
97 BU Communication (digital) BN Communication (digital)
88 BN -U
Sensor with fixed cable (OMK) Sensor with TOP68 plug connection (CYK71)
Core Assignment Core Assignment
B
B
YE +U
Coax, inside -U
B
B
1. Remove the SXP connector (transmitter side!) from the cable.
2. Refer to the table for the cable assignment and terminals of Liquisys COM223-WX/WS.
Please note that the cable assignment varies depending on the sensor version (fixed cable
or TOP68 plug connection).
Performance characteristics
From air to nitrogen at reference operating conditions:
t90 : 60 s
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Maximum measured error
1
5
2
4
3
1 2
3
6
4
5
1)
COS61D
Measuring range Maximum measured error
< 12 mg/l 0.01 mg/l or ±1 % of reading
12 mg/l to 20 mg/l ±2% of reading
COS61
Measuring range Maximum measured error
< 12 mg/l 0.02 mg/l or ±1 % of reading
12 mg/l to 20 mg/l ±2% of reading
Oxymax COS61D/COS61
Repeatability
Operating life of sensor cap
±0.5 % of end of measuring range
>2 years (under reference operating conditions, protect against direct sunlight)
Installation
Installation examples
Immersion operation Universal holder and chain assembly
A0030564
5 Chain holder on railing
1 Chain
2 Holder Flexdip CYH112
3 Rail
4 Sensor Oxymax
5 Wastewater assembly Flexdip CYA112
6 Chain holder on upright post
1 Weather protection cover CYY101
2 Controller / transmitter
3 Chain
4 Wastewater assembly Flexdip CYA112
5 Sensor Oxymax
6 Holder Flexdip CYH112
1) In accordance with IEC 60746-1 at rated operating conditions
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A0030565
Oxymax COS61D/COS61
1
2
3
4
5
2
3
4
Universal holder and fixed immersion tube
A0030567
7 Assembly holder with immersion tube
1 Protective cover
2 Controller / transmitter
3 Flexdip CYA112 immersion assembly
4 Sensor Oxymax
5 Assembly holder Flexdip CYH112
Basin rim mounting with immersion tube
A0030568
8 Basin rim mounting
1 Pendulum holder CYH112
2 Assembly Flexdip CYA112
3 Assembly float
4 Sensor Oxymax
Endress+Hauser 7
Oxymax COS61D/COS61
1
2
3
4
5
6
7
G1
800 (31.50)
500 (19.69)
220 (8.66)
Ø200 (7.87)
1
23
4
6
7
8
5
Float
The CYA112 float is for use in the case of large fluctuations in water level, for example in rivers or
lakes.
1 Cable run with strain relief and rain shield
2 Fixing ring for rope and chains with terminal screw
3 Eyelets Ø15, 3 x 120 ° for anchoring
4 Plastic float, resistant to salt water
5 Pipe 40 x 1, stainless steel 1.4571
6 Bumper and ballast
7 Oxygen sensor
Flow assembly COA250
9 Dimensions in mm (inch)
10 COA250
A0032159
A0013319
11 Bypass installation with manually actuated valves or solenoid
valves
1 Main pipe
2 Medium return
3 Oxygen sensor
4, 7 Manually actuated or solenoid valves
5 Flow assembly COA250-A
6 90 ° pipe elbow
8 Medium removal
A0030570
Environment
Ambient temperature
Storage temperature
Degree of protection
8 Endress+Hauser
–20 to 60 °C (–4 to 140 °F)
–20 to 70 °C (–4 to 158 °F)
at 95% relative air humidity, not condensating
COS61D
IP 68 (test conditions: 10 m (33 ft) water column, at 25 °C (77 °F) over 30 days)
Oxymax COS61D/COS61
232.5 (9.15)
Ø40 (1.57)
186 (7.32)
12 (0.47)
77 (3.04) / 66 (2.59)*
197 (7.76)
243.5 (9.59)
21 (0.83)
15 (0.59)
11 (0.43)
46.5 (1.83)
NPT ¾"
G1
COS61
• Fixed cable versions:
IP 68 (test conditions: 10 m (33 ft) water column at 25 °C (77 °F) over 30 days)
• Top68 plug-in head versions:
IP 68 (test conditions: 1 m (3.3 ft) water column at 50 °C (122 °F) over 7 days)
Electromagnetic compatibility
Process temperature
Process pressure
Design, dimensions COS61D
COS61D
Interference emission and interference immunity as per EN 61326: 2005, Namur NE 21:2007
COS61
Interference emission and interference immunity as per EN 61326: 1997 / A1: 1998
Process
–5 to +60 ˚C (20 to 140 ˚F)
Ambient pressure ... 10 bar (... 145 psi) abs.
Mechanical construction
Endress+Hauser 9
12 With optional M12 connector
Dimensions in mm (inch)
A0037103
13 With optional cleaning unit
* depending on version of cleaning unit
A0037093
design, dimensions COS61
G1
220 (8.66)
Ø40 (1.57)
186 (7.32)
G1
220 (8.66)
Ø40 (1.57)
186 (7.32)
50 (1.97)
19 (0.75)
19 (0.75)
Ø40 (1.57)
24°
61 (2.40)
28.5 (1.12)
A
B
77 (3.04)
11 (0.43)
Oxymax COS61D/COS61
Optional cleaning unit
14 Version with fixed cable
Dimensions in mm (inch)
A0027092
15 Version with TOP68 - plug-in head
A0027093
Weight
16 Dimensions in mm (inch)
with cable length 7 m (23 ft):
0.7 kg (1.5 lbs)
with cable length 15 m (49 ft): 1.1 kg (2.4 lbs)
Materials
with TOP68 plug connection: 0.3 kg (0.66 lbs) depending on version
Parts in contact with medium
Sensor shaft Stainless steel 1.4435 (AISI 316L)
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A0013314
Oxymax COS61D/COS61
Cap with fluorescence layer POM
Fluorescence layer Silicone
Process connection
Sensor cable
Cable connection at transmitter
Maximum cable length
Temperature compensation
COS61D
G1, NPT 3/4"
COS61
G1
COS61D
Shielded 4-core fixed cable
COS61
Shielded 7-wire fixed cable or double-shielded coaxial cable with 4 pilot wires (with TOP68 plug
connection)
COS61D
• Terminal connection, end ferrules
• Optional: M12 connector
COS61
• SXP connector (field device)
• Terminal connection (panel-mounted instrument)
max. 100 m (330 ft), incl. Cable extension
Internal
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Oxymax COS61D/COS61
Interface
Product page
Product Configurator
COS61D
Memosens protocol
COS61
RS 485
Ordering information
www.endress.com/cos61
www.endress.com/cos61d
On the product page there is a Configure button to the right of the product image.
1. Click this button.
The Configurator opens in a separate window.
2. Select all the options to configure the device in line with your requirements.
In this way, you receive a valid and complete order code for the device.
3. Export the order code as a PDF or Excel file. To do so, click the appropriate button on the right
above the selection window.
For many products you also have the option of downloading CAD or 2D drawings of the
selected product version. Click the CAD tab for this and select the desired file type using
picklists.
Scope of delivery
Assemblies (selection)
Scope of delivery of sensor
• Oxygen sensor with protection cap or mounted cleaning system (optional)
• Brief Operating Instructions
Accessories
The following are the most important accessories available at the time this documentation was
issued.
For accessories not listed here, please contact your Service or Sales Center.
‣
FlexdipCYA112
• Immersion assembly for water and wastewater
• Modular assembly system for sensors in open basins, channels and tanks
• Material: PVC or stainless steel
• Product Configurator on the product page: www.endress.com/cya112
Technical Information TI00432C
Flowfit COA250
• Flow assembly for oxygen measurement
• Product Configurator on the product page: www.endress.com/coa250
Technical Information TI00111C
Cleanfit COA451
• Manual retractable assembly made of stainless steel with ball valve shutoff
• For oxygen sensors
• Product Configurator on the product page: www.endress.com/coa451
Technical Information TI00368C
12 Endress+Hauser
Oxymax COS61D/COS61
Assembly holder
Measuring cable
Zero-point gel
Junction box (COS61 only)
Flexdip CYH112
• Modular holder system for sensors and assemblies in open basins, channels and tanks
• For Flexdip CYA112 water and wastewater assemblies
• Can be affixed anywhere: on the ground, on the capstone, on the wall or directly onto railings.
• Stainless steel version
• Product Configurator on the product page: www.endress.com/cyh112
Technical Information TI00430C
Memosens data cable CYK11
• Extension cable for digital sensors with Memosens protocol
• Product Configurator on the product page: www.endress.com/cyk11
Technical Information TI00118C
COY8
Zero-point gel for oxygen and chlorine sensors
• Oxygen-free gel for the validation, calibration and adjustment of oxygen measuring cells
• Product Configurator on the product page: www.endress.com/coy8
Technical Information TI01244C
VS
• Junction box for cable extension of COS61 sensor with SXP plug-in connector
• With socket and 7-pin connector
• Degree of protection: IP 65
• Order number: 50001054
Protection guard
Cleaning unit
Calibration vessel
Membrane basket protector COY3-SK
• For using the sensor in fish farming tanks
• Order No.: 50081787
Compressed air cleaning for COSXX
• Connection: AD 6/8 mm (incl. hose reducer coupling) or AD 6.35 mm (¼")
• Materials: POM/V4A
• Order No.
– AD 6/8 mm: 71110801
– AD 6.35 mm (¼"): 71110802
Compressor
• For compressed air cleaning
• Order No.
– 230 V AC order no. 71072583
– 115 V AC order no. 71194623
Calibration vessel
• For COS61D/61
• Order No.: 51518599
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www.addresses.endress.com
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