DO sensor. Sensor with long-term stability for frequent sterilization and autoclaving. Email: lam.nguyen@vietan-enviro.com HP: 0945 293292

1. TI00446C/07/EN/02.12
71153855
Technical Information
Oxymax COS22/22D
Digital or analog sensor for measuring oxygen
Sensor with long-term stability for frequent sterilization and autoclaving
Application
• Pharma and biotechnology
– Process control in enzyme production
– Control of culture growth
• Food industry
– Beverages
• Chemical industry
• Water treatment
– Boiler feed water
– WFI (water for injection)
• Inertizations
• Residual oxygen measurement in processes
Your benefits
• Sensor version suitable for the pharmaceutical industry:
– Stainless steel 1.4435 (AISI 316L)
– Sterilizable and autoclavable
• Application-specific versions:
– Sensor for standard applications, e.g. for fermenter
monitoring
– Trace sensor, e.g. for power plant applications and as CO2
compatible sensor for the beverage industry
• Versatile usage:
– Standard process connection Pg 13.5
– Installation in standard pH assemblies possible
• Short response time: t98 < 60 s
• Integrated temperature sensor
Further benefits offered by Memosens technology
• Maximum process safety through contactless inductive signal
transmission
• Data safety through digital data transmission
• Easy handling thanks to storage of sensor-specific data in the
sensor
• Predictive maintenance possible thanks to registration of
sensor load data in the sensor

2. Oxymax COS22/22D
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Function and system design
Measuring principle The oxygen molecules diffused through the membrane are reduced to hydroxide ions (OH-) at the cathode.
Silver is oxidized to silver ions (Ag+) at the anode (this forms a silver halogenide layer).
A current flows due to the electron donation at the cathode and the electron acceptance at the anode. Under
constant conditions, this flow is proportional to the oxygen content of the medium.
This current is converted in the transmitter and indicated on the display as an oxygen concentration in mg/l,
μg/l, ppm, ppb or Vol%, as a saturation index in % SAT or as an oxygen partial pressure in hPa.
Application in gaseous media The trace sensor version can be used in gaseous media, e.g. with inertizations and quality monitoring of traces.
Process monitorings in gaseous media can be realized with the standard sensor version.
The measured value will be displayed in Vol% or as an oxygen partial pressure in hPa.
Sensors in dry media show an ingreased electrolyte consumption. This results in shorter maintenance intervals.
Memosens technology Maximum process safety
The inductive and non-contacting measured value transmission of Memosens guarantees maximum process
safety and offers the following benefits:
• All problems caused by moisture are eliminated.
– The plug-in connection is free from corrosion.
– Measured value distortion from moisture is not possible.
Correct transfer of minimum measured values, e.g. with amperometric sensors.
– The plug-in system can even be connected under water.
• The transmitter is galvanically decoupled from the medium. The result: No more need to ask about
"symmetrically high-impedance" or "unsymmetrical" (for pH/ORP measurement) or an impedance
converter.
• EMC safety is guaranteed by screening measures for the digital measured value transmission.
• Application in explosion-hazardous areas is unproblematic; the integrated electronics are intrinsically safe.
Data safety through digital data transfer
The Memosens technology digitalizes the measured values in the sensor and transfers them to the transmitter
contactlessly and free from interference potential. The result:
• An automatic error message is generated if the sensor fails or the connection between sensor and transmitter
is interrupted.
• The availability of the measuring point is dramatically increased by immediate error detection.
Easy handling
Sensors with Memosens technology have integrated electronics that allow for saving calibration data and
further information such as total hours of operation and operating hours under extreme measuring conditions.
When the sensor is mounted, the calibration data are automatically transferred to the transmitter and used to
calculate the current measured value. Storing the calibration data in the sensor allows for calibration away from
the measuring point. The result:
• Sensors can be calibrated under optimum external conditions in the measuring lab. Wind and weather do
neither affect the calibration quality nor the operator.
• The measuring point availability is dramatically increased by the quick and easy replacement of precalibrated
sensors.
• The transmitter does not need to be installed close to the measuring point but can be placed in the control
room.
• Maintenance intervals can be defined based on all stored sensor load and calibration data and predictive
maintenance is possible.
• The sensor history can be documented on external data carriers and evaluation programs at any time. Thus,
the current application of the sensors can be made to depend on their previous history.

3. Oxymax COS22/22D
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Measuring system A complete measuring system comprises:
• A digital oxygen sensor Oxymax COS22 or Oxymax COS22D
• A transmitter, see table
• An appropriate measuring cable, see table
• Optional: an assembly, e.g. fixed installation assembly CPA442, flow assembly CPA240 or retractable
assembly CPA475
COS22D-
Standard, Traces
COS22-
Standard
COS22-
Traces
Liquiline CM44x Cable: CYK10 - -
Liquiline CM42 Cable: CYK10 - -
Liquisys COM2x3F - Cable: COK21 -
Third party XMTR Memosens partners possible, cable: COK21 possible, cable: COK21
a0001398
Example of a measuring system with COS22D-*1
1 Liquiline M CM42
2 Measuring cable CYK10
3 Digital oxygen sensor Oxymax COS22D-*1
4 Fixed installation assembly CPA442
1
23
4

4. Oxymax COS22/22D
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Input
Measured variable Dissolved oxygen [mg/l, μg/l, ppm, ppb, % SAT or hPa]
Temperature [˚ C, ˚F)
Measuring range All ranges refer to 20 ˚C (68 ˚F) and 1013 hPa (15 psi).
a0006653
Example of a measuring system with COS22
1 Oxygen sensor COS22
2 Retractable assembly CPA475
3 Measuring cable COK21
4 Transmitter Liquisys COM253F
1
2
3
4
CAL REL
REL1
REL1
ALARM
REL2
REL2E
Measuring range Optimum operational range1)
1) Applications in this range ensure long service life and minimum maintenance effort
COS22/22D-*1 0.01 to 60 mg/l
0 to 600 %SAT
0 to 1200 hPa
0 to 100 Vol%
0.01 to 20 mg/l
0 to 200 %SAT
0 to 400 hPa
0 to 40 Vol%
COS22/22D-*3 0.001 to 10 mg/l
0 to 120 %SAT
0 to 250 hPa
0 to 25 Vol%
0.001 to 2 mg/l
0 to 20 %SAT
0 to 40 hPa
0 to 4 Vol%

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Wiring
Electrical connection COS22D
The sensor is electrically connected to the transmitter by means of the special measuring cable CYK10.
COS22
The electrical connection between the sensor and the transmitter uses the multi-core special measuring cable
COK21.
Performance characteristics
Response time From air to nitrogen at reference conditions
• t90 : < 30 s
• t98 : < 60 s
Reference operating
conditions
Signal current at air1) COS22/22D-*1 (standard sensor): 40 to 100 nA
COS22/22D-*3 (trace sensor): 210 to 451 nA
Zero current COS22/22D-*1 (standard sensor): < 0.1 % of the signal current at air
COS22/22D-*3 (trace sensor): < 0.03 % of the signal current at air
Measured value resolution COS22/22D-*1 (standard sensor): 10 ppb in liquids, 0.2 hPa or 0.02 Vol% in gaseous media
COS22/22D-*3 (trace sensor): 1 ppb in liquids, 0.02 hPa or 0.002 Vol% in gaseous media
equals the recommended resolution at the transmitter
Maximum measured error ±1.25 % of measuring range2)
Repeatability ±1 % of the measuring range end
a0003350
Special measuring cable CYK10
a0005583-en
Special measuring cable COK21
PK
GN / YE
BN
YE
BU
S
12
90
91
11
Assignment Terminal
External shield
Cathode
Anode
NTC temp. sensor
Active internal shield
(NTC temp. sensor)
Reference temperature: 25 ˚C (77 ˚F)
Reference pressure: 1013 hPa (15 psi)
1) For the reference operating conditions indicated
2) In accordance with IEC 61298-2 at nominal operating conditions

6. Oxymax COS22/22D
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Long-term drift < 4 % per month under reference operating conditions
≤ 1 % per month when operating under reduced oxygen conditions (<4 Vol% O2)
Influence of medium pressure Pressure compensation not necessary
Polarization time COS22/22D-*1 (standard sensor): < 30 min for 98% of the signal value, 2 h for 100%
COS22/22D-*3 (trace sensor): < 3 h for 98% of the signal value, 12 h for 100%
Oxygen intrinsic consumption COS22/22D-*1 (standard sensor): approx. 20 ng/h at air at 25 ˚C (77 ˚F)
COS22/22D-*3 (trace sensor): approx. 100 ng/h at air at 25 ˚C (77 ˚F)
Electrolyte durability Theoretical durability at pO2 = 210 mbar and T=25 ˚C (77 ˚F)
COS22/22D-*1 (standard sensor): > 1.5 years
COS22/22D-*3 (trace ensor): > 3 months
Temperature compensation COS22D
Compensation of the membrane properties is realized in the transmitter from -5 to 90˚C (23 to 194 ˚F), extra-
polation from 90˚C (194 ˚F)
• Measured variable as partial pressure [hPa] or in Vol%: -5 to 90 ˚C (23 to 194 ˚F)
• Measured variable as concentration [mg/l]: 0 to 80 ˚C (32 to 176 ˚F)
• Measured variable as saturation [%SAT]: -5 to 90 ˚C (23 to 194 ˚F)
COS22
Compensation of the membrane properties depends on the transmitter used, recommended: 2.4 % per K
Installation
Installation instructions Installation into appropriate assembly necessary (depending on application)
NOTICE
Installation without assembly can cause cable break or damage of the sensor
► Do not install the sensor suspended from the cable.
Angle of installation
a0011887
Defined ranges of temperature compensation depending on the unit of measure
a0005584-en
Permitted angle of installation
10° 10° Not permissible!Not permissible!
Permissible angle of installation

7. Oxymax COS22/22D
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Environment
Ambient temperature range –5 to +135 ˚C (23 to 175 ˚F)
Storage temperature –5 to +50 ˚C (20 to 120 ˚F) at 95% relative air humidity, not condensing
NOTICE
Danger of drying out
► Only store the sensor with the protection cap (filled with tap water).
Ingress protection IP 68 (10 m (33 ft) water column at 25 ˚C (77 ˚F) during 45 days, 1 mol/l KCl)
Humidity 0 to 100%
COS22D: condensing, COS22: not condensing in the plug-in connector T-82
Process
Process temperature –5 to +135 ˚C (23 to 175 ˚F), non-freezing
Process pressure ambient pressure to 12 bar (174 psi)
Temperature-pressure
diagram
Minimum flow rate COS22/22D-*1 (standard sensor): 0.02 m/s (0.07 ft/s)
COS22/22D-*3 (trace sensor): 0.1 m/s (0.33 ft/s)
Chemical durability Parts in contact with medium are chemically resistent against:
• Dissolved acids and bases
• Hot water and steam
max. 135 ˚C (275 ˚F)
• CO2
up to 100 %, with trace sensor COS22/22D-*3 only
NOTICE
Hydrogen sulfide and ammonia reduce the durability of the sensor
► Do not use the sensor in applications, where the sensor is exposed to hydrogen sulfide and ammonia
vapors.
Interference Molecular hydrogen causes at least lesser findings and can cause total sensor failure.
CIP capability Versions COS22/22D-****2
a0015193
Temperature-pressure diagram

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Mechanical construction
Design
Dimensions
a0011868
COS22: Exploded view
a0011869
COS22D: Exploded view
1
2
3
4
Plug-in head
Pressure ring
Sensor shaft
O-ring 8.5 x 1.5 mm
5
6
7
Membrane body
Shaft cover
Glass body with cathode and
anode
8
9
Process sealing 10.77 x 2.62
mm
Process connection Pg 13.5
a0011886
COS22: Dimensions
a0011881
COS22D: Dimensions

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Flow assembly for sensors
with Ø 12 mm (accessories)
Weight Depending on version (length)
0.2 kg (0.44 lbs) to 0.7 kg (1.54 lbs)
Material
Process connection Thread Pg 13.5
Surface roughness Ra < 0.38 μm
Temperature sensor NTC 22 kΩ
Electrolyte COS22/22D-*1 (standard sensor): alkalescent electrolyte
COS22/22D-*3 (trace sensor): neutral electrolyte
a0015019
Flow assembly for 120 mm sensors
In contact with medium
Sensor shaft
(depending on version)
Stainless steel 1.4435 (AISI 316L)
Titane
Alloy C22
Electrode combination Silver / platinum
Process seal Viton®
(FDA compliant)
Process sealing for ATEX/FM/CSA Viton®
(not FDA compliant)
Sealings/O-rings
Process seal
Viton® (FDA compliant)
Perfluoro elastomer with USP88 Class VI
Membrane Silicone (FDA compliant), PTFE, steel mesh

10. Oxymax COS22/22D
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Ordering information
Product page You can create a complete and valid order code by using the configurator on the internet product page.
Enter the following address to access the product page:
www.products.endress.com/cos22
www.products.endress.com/cos22d
Product configurator 1. You can choose from the following options on the product page located on the right:
2. Click "Configure this product".
3. The configurator opens in a separate window. You can now configure your device and receive the
complete order code that applies for the device.
4. Afterwards, export the order code as a PDF or Excel file. To do so, click the appropriate button at the top
of the page.
Scope of delivery The following items are included in the delivery:
• Oxygen sensor with tap water filled cap for membrane protection
• Electrolyte, 1 bottle, 10 ml (0.34 fl.oz.)
• Disassembly tool for membrane body
• Brief Operating Instructions
• Operating Instructions on data storage medium
Certificates and approvals
Ex approval Version COS22D-BA
ATEX II 1G / IECEx Ex ia IIC T3/T4/T6 Ga
Material certificates Manufacturer’s declaration of FDA conformity
The manufacturer declares the FDA compliance of the materials used.
Ask your local sales center for the certificates.
Note for Ex versions:
For use of these sensors in FDA applications, an additional FDA compliant sealing (e.g. CPA442) is required in
front of the process sealing to separate the process from the Ex zone.
Inspection certificate
Depending on the version, an inspection certificate 3.1 acc. to EN10204 is supplied (--> product structure).
Product FDA certificate for
COS22/22D-****22 Membrane, O-rings, process sealing
COS22Z-*2*2 Membrane, O-rings, process sealing
COS22/22D-****23 Membrane, O-rings
COS22Z-*2*3 Membrane, O-rings

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Accessories
In the following sections, you find the accessories available at the time of issue of this documentation.
For information on accessories that are not listed here, please contact your local service or sales
representation.
Assemblies (selection) Flowfit CPA240
• pH/redox flow assembly for processes with a high level of requirements
• Ordering as per product structure (-> online Configurator, www.products.endress.com/cpa240)
• Technical Information TI00179C/07/EN
Cleanfit CPA450
• Manual retractable assembly for installing 120 mm sensors in tanks and pipework
• Ordering as per product structure (-> online Configurator, www.products.endress.com/cpa450)
• Technical Information TI00183C/07/EN
Cleanfit CPA475
• Retractable assembly for installation in tanks and pipework under sterile conditions
• Ordering as per product structure (-> online Configurator, www.products.endress.com/cpa475)
• Technical Information TI00240C/07/EN
Unifit CPA442
• Installation assembly for food, biotechnology and pharmaceuticals, with EHEDG and 3A certificate
• Ordering as per product structure (-> online Configurator, www.products.endress.com/cpa442)
• Technical Information TI00306C/07/EN
Flow assembly for sensors with Ø 12 mm and length 120 mm
• compact stainless steel assembly with low sample volume
• order no.: 71042404
Measuring cable COS22D
CYK10 Memosens data cable
• For digital sensors with Memosens technology
pH, redox, oxygen (amperometric), chlorine, conductivity (conductive)
• Ordering as per product structure (-> online Configurator, www.products.endress.com/cyk10)
CYK11 Memosens data cable
• Extension cable for digital sensoren with Memosens protocol
• Ordering as per product structure (-> Online configurator, www.products.endress.com/cyk11)
COS22
Special measuring cable COK21
• Cable length 3 m (9.8 ft), order no. 51505870
• Cable length 10 m (33 ft), order no. 51505868
Junction box COS22D
Junction box RM
• For cable extension (e.g. for Memosens sensors)
• 5 terminals
• Cable entries: 2 x Pg 13.5
• Material: PC
• Ingress protection: IP 65
• Order no.: 51500832
COS22
Junction box VBM
• For cable extension
• 10 terminals
• Cable entries: 2 x Pg 13.5 or 2 x NPT ½"
• Material: aluminum
• Ingress protection: IP 65 (i NEMA 4X)
• Order numbers:
– cable entries Pg 13.5: 50003987
– cable entries NPT ½": 51500177

12. Zero solution • 3 units to produce 3 x 1 liter oxygen-free solution
• order no. 50001041
Maintenance kit
To complete your order code, simply add the optional features to the end of the order code. If you have
any questions, please contact your local sales office.
Number of membranes
A 3 pieces
B 10 pieces
Material of O-rings
2 Fluoroelastomer FDA
5 Perfluoroelastomer USP Cl. VI
Material of membrane ring
B Stainless steel
D Titanium
E Alloy C22
Material of process sealing
2 Fluoro elastomer FDA
3 Fluoro elastomer Ex
COS22Z- Order code
Electrolyte (optional)
E1
E2
Standard, 25 ml
Traces, 25 ml
Inner glass body (optional)
F1
F2
Standard
Traces
Material of the shaft sleeve (optional)
G1
G2
G3
Stainless steel
Titanium
Alloy C22
Test, Certificate (optional, multiple selection possible)
HA 3.1
Additional approval (optional, multiple selection possible)
IA Pharma Certificate of compliance
TI00446C/07/EN/02.12
71153855
FM9