Endress+Hauser Oxymax W COS61 User manual

BA387C/07/en/06.05
51518696
Operating Instructions
Oxymax W COS61
Dissolved oxygen sensor

Endress+Hauser
Brief overview
Here is how to use these Operating Instructions to commission your sensor quickly and safely:
Safety instructions
→ä4
→ä5
General safety instructions
Explanation of the warning symbols
You can find special instructions at the appropriate position in the chapter in question. The
positions are indicated with the icons Warning #, Caution "and Note !.
Æ
Installation
→ä7
→ä10
Here you can find installation conditions such as sensor dimensions and the angle of installation.
Installation examples can be found here.
Æ
Wiring
→ä14 Refer to these pages for sensor wiring.
Æ
Sensor design and measuring principle
→ä16
→ä17
→ä17
Here you can read about the sensor design.
The measuring principle is explained on this page.
Here you can find the possible calibration methods.
Æ
Maintenance
→ä21
→ä26
Regular maintenance tasks, such as cleaning the sensor, are absolutely essential and prolong the
operating time of the sensor.
Here you can find an overview of the spare parts which can be delivered as well as an overview
of the system.
Æ
Troubleshooting
→ä25 If faults occur during operation, use the checklist to locate the cause.
Æ
Æ
Index
→ä29 You can find important terms and keywords on the individual sections here. Use the keyword
index to find the information you need quickly and efficiently.

Oxymax W COS61
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Table of contents
1 Safety instructions . . . . . . . . . . . . . . . . 4
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Installation, commissioning and operation . . . . . . . . 4
1.3 Operational safety . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Notes on safety icons and symbols . . . . . . . . . . . . . . 5
1.6 Cross-reference symbols . . . . . . . . . . . . . . . . . . . . . 5
2 Identification . . . . . . . . . . . . . . . . . . . . 6
2.1 Product structure . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Installation . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Incoming acceptance, transport, storage . . . . . . . . . . 7
3.2 Installation conditions . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Installation instructions . . . . . . . . . . . . . . . . . . . . . . 8
3.4 Installation examples . . . . . . . . . . . . . . . . . . . . . . . 10
3.5 Post-installation check . . . . . . . . . . . . . . . . . . . . . . 13
4 Wiring . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Direct connection to the transmitter . . . . . . . . . . . 14
4.2 Connection via junction box . . . . . . . . . . . . . . . . . 15
4.3 Post-connection check . . . . . . . . . . . . . . . . . . . . . . 15
5 Device description . . . . . . . . . . . . . . . 16
5.1 Sensor design . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Measuring principle . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6 Commissioning. . . . . . . . . . . . . . . . . . 20
6.1 Function check . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.2 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7 Maintenance. . . . . . . . . . . . . . . . . . . . 21
7.1 Cleaning the sensor . . . . . . . . . . . . . . . . . . . . . . . . 21
7.2 Regenerating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8 Accessories. . . . . . . . . . . . . . . . . . . . . 23
8.1 Connection accessories . . . . . . . . . . . . . . . . . . . . . 23
8.2 Installation accessories . . . . . . . . . . . . . . . . . . . . . . 23
8.3 Measuring, monitoringand cleaning . . . . . . . . . . . . 24
9 Troubleshooting . . . . . . . . . . . . . . . . . 25
9.1 Troubleshooting instructions . . . . . . . . . . . . . . . . . 25
9.2 Sensor checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9.3 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9.4 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9.5 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10 Technical data . . . . . . . . . . . . . . . . . . . 27
10.1 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
10.2 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
10.3 Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
10.4 Performance characteristics . . . . . . . . . . . . . . . . . . 27
10.5 Mechanical construction . . . . . . . . . . . . . . . . . . . . 28
Index . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Safety instructions Oxymax W COS61
4Endress+Hauser
1 Safety instructions
1.1 Designated use
The oxygen sensor is suitable for continuous measurement of dissolved oxygen in water.
Typical applications are:
• Measuring, monitoring and regulating the oxygen content in activated sludge basins.
• Monitoring the oxygen content in the sewage treatment plant outlet.
• Monitoring, measuring and regulating the oxygen content in public waters and fish farming
water.
• Monitoring of oxygen enrichment in drinking water.
Any other use than the one described here compromises the safety of persons and the entire
measuring system and is, therefore, not permitted.
The manufacturer is not liable for damage caused by improper or non-designated use.
1.2 Installation, commissioning and operation
Please note the following items:
• Installation, electrical connection, commissioning, operation and maintenance of the measuring
system must only be carried out by trained technical personnel.
The technical personnel must be authorized for the specified activities by the system operator.
• Technical personnel must have read and understood these Operating Instructions and must
adhere to them.
• Before commissioning the entire measuring point, check all the connections for correctness.
Ensure that hose connections are not damaged.
• Do not operate damaged products and secure them against unintentional commissioning. Mark
the damaged product as being defective.
• Measuring point faults may only be rectified by authorized and specially trained
personnel.
• If faults cannot be rectified, the products must be taken out of service and secured against
unintentional commissioning.
• Repairs not described in these Operating Instructions may only be carried out at the
manufacturer’s or by the service organization.
1.3 Operational safety
The sensor has been designed and tested according to the state of the art and left the factory in
perfect functioning order.
Relevant regulations and European standards have been met.
As the user, you are responsible for complying with the following safety conditions:
• Installation instructions
• Local prevailing standards and regulations.

Oxymax W COS61 Safety instructions
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1.4 Return
If the device requires repair, please send it cleaned to the sales center responsible.
Please use the original packaging, if possible.
Please enclose the completed "Declaration of contamination" (copy the second last page of these
Operating Instructions) with the packaging and the transportation documents. No repair without
completed "Declaration of contamination"!
1.5 Notes on safety icons and symbols
1.6 Cross-reference symbols
#
Warning!
This symbol alerts you to hazards. They can cause serious damage to the instrument or to persons
if ignored.
"Caution!
This symbol alerts you to possible faults which could arise from incorrect operation.
They could cause damage to the instrument if ignored.
!Note!
This symbol indicates important items of information.
È ä 1 This symbol stands for a cross-reference to a specific page (e.g. Page 1).
È å 2 This symbol stands for a cross-reference to a specific graphic (e.g. Fig. 2).

Identification Oxymax W COS61
6Endress+Hauser
2 Identification
2.1 Product structure
2.2 Scope of delivery
The following items are included in the delivery:
• Oxygen sensor with transport protection cap for membrane protection
• Operating Instructions, English
If you have any questions, please contact your supplier or your sales center responsible.
Certificate
A Version for non-hazardous area
Cable length incl. extension cable
0 Cable length: 1.5 m / 4.9 ft
1 Cable length: 7 m / 23 ft
2 Cable length: 15 m / 49 ft
8 No cable (for replacement for TOP 68 version)
9 Special version upon request
Sensor head
F Thread G1, fixed cable with SXP connector
S Thread G1, TOP68 connector
Accessories
0 Without accessories
COS61- Complete order code

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3 Installation
3.1 Incoming acceptance, transport, storage
• Make sure the packaging is undamaged!
Inform the supplier about damage to the packaging.
Keep the damaged packaging until the matter has been settled.
• Make sure the contents are undamaged!
Inform the supplier about damage to the delivery contents.
Keep the damaged products until the matter has been settled.
• Check that the scope of delivery is complete and agrees with your order and the shipping
documents.
• The packaging material used to store or to transport the product must provide shock protection
and humidity protection. The original packaging offers the best protection. Also, keep to the
approved ambient conditions (see "Technical data").
• If you have any questions, please contact your supplier or your sales center responsible.
3.2 Installation conditions
3.2.1 Dimensions
a0004083-en
Fig. 1: Fixed cable version
a0004084-en
Fig. 2: TOP 68 plug-in head version
220 / 8.66
Ø40 / 1.57
186 / 7.32
220 / 8.66
Ø40 / 1.57
186 / 7.32

Installation Oxymax W COS61
8Endress+Hauser
3.2.2 Orientation
The sensor can be installed up to the horizontal in an assembly, support or a suitable process
connection.
Other angles and overhead installation are not recommended. Reason: possible sediment formation
and resulting falsification of measured value.
a0004087
Fig. 3: Angle of installation
A Recommended angle of installation: 0 ... 180 °
!Note!
Make sure you comply with the instructions for installing sensors. You will find them in the
Operating Instructions for the assembly used.
3.2.3 Mounting location
• Select the installation location so that there is easy access for later calibration.
• Make sure that upright posts and assemblies are secured safely and vibration-free.
• For immersed operation in an activated sludge basin, select an installation location which
produces a typical oxygen concentration.
3.3 Installation instructions
3.3.1 Measuring system
A complete measuring system comprises at least:
• Oxygen sensor
• Transmitter, e.g. Liquisys M COM223/253
• Special measuring cable if extension necessary
• Assembly, e.g. flow assembly COA250, immersion assembly CYA611 or
retractable assembly COA451
Optional:
• Universal suspended assembly holder CYH101 for immersed operation
• Junction box VS (with cable extension)
• Automatic spray cleaning system Chemoclean
A

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a0004102
Fig. 4: Measuring system (example)
1 Immersion assembly CYA611
2 Junction box VS (optional)
3 Transmitter Liquisys M COM253
4 Oxygen sensor COS61
3.3.2 Installing a measuring point
!Note!
For immersed operation, install the individual modules away from the basin on a solid base. Only
carry out the final installation at the intended installation location.
For a complete installation of a measuring point, proceed as follows:
1. Install a retractable or a flow assembly (if used) into the process.
2. Connect the water supply to the rinse connections (if you use an assembly with cleaning
function).
3. Install and connect the oxygen sensor.
4. Install an immersion or a suspension assembly (if used) into the process.
"Caution!
• For immersed operation, the sensor must be installed in an immersion assembly (e.g. CYA611).
Do not install the sensor suspended from the cable.
• Screw the sensor into the assembly so that the cable is not twisted.
• Avoid exerting excessive tensile force on the cable (e.g. from jerky pulling).
• Select the installation location so that there is easy access for later calibration.
#Warning!
When using metallic assemblies and installation equipment, comply with national grounding
regulations.

Installation Oxymax W COS61
10 Endress+Hauser
3.4 Installation examples
3.4.1 Immersion operation
Universal assembly holder and chain assembly
For large basins, where sufficient installation distance is required from the basin edge (activated
sludge basin, especially), it is advisable to use the upright post and chain assembly (→å5, →å
6). The free swinging of the immersed assembly practically rules out vibrations from the upright
post.
A good self-cleaning of the fluorescence caps is reached due to the swinging of the assembly.
According to this effect, the sensor life time can be extended.
a0004103-en
Fig. 5: Universal assembly holder CYH101 with
immersible pendulum assembly CYA611
1 Weather protection cover
2 Upright post, square pipe SS 1.4301 (AISI 304)
3 Transverse pipe SS 1.4301 (AISI 304)
4Starhandle
5 Second fixing possibility for transverse pipe
6 Immersion assembly CYA611
a0004104-en
Fig. 6: Immersible pendulum assembly CYA611
1 Protection cap
2 Worm drive hose clip
3 Pipe clips (detailed drawing in right half)
4 PVC pipe
5 Threaded coupling

Oxymax W COS61 Installation
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Universal assembly holder and fixed immersion assembly
The preferable type of installation for strong or turbulent flow (> 0.5 m/s) in the basin or open
channels is to secure the device to an upright post and a securely mounted immersion tube (→å
7). If the flow is very strong, a second transverse pipe can be installed with its own pipe support.
a0004105-en
Fig. 7: Universal assembly holder CYH101 with immersion tube CYY105
1Starhandle
2 Pipe support
3 Fixing bracket
4 Immersion assembly (= immersion tube)
Basin rim mounting with immersion tube
For fixing to the sides of the basin or channel, we recommend immersion assembly basin rim
mounting (→å8, →å9).
If there is strong turbulence or flow, a second basin rim mounting must be used for the immersion
assembly.
a0004106
Fig. 8: Horizontal basin rim mounting
1 Protection cover for cable entry
2 Pipe support
3 Immersion assembly SS 1.4301 (AISI 304)
a0004107
Fig. 9: Vertical basin rim mounting
4 Basin rim mounting
5Starhandle
1
2
3
4
5
1
2
3
5
4

Installation Oxymax W COS61
12 Endress+Hauser
Floating body
To aid installation in strongly fluctuating water levels, e.g. in rivers or lakes, the floating body
COA110-50 is available (→å10).
3.4.2 Flow assembly
The COA250-B flow assembly (→å11) with automatic self-venting is suitable for use in
pipelines or hose connections. The inlet is at the bottom of the assembly, the outlet at the top
(connection thread G¾). It can be installed in a pipe by using two 90° pipe brackets to allow inflow
to the assembly (→å12, item 6).
a0004108-en
Fig. 10: Floating body
1
2
3
4
5
6
7
Cable route with strain relief and rain protection
Mounting ring for ropes and chains with locking
screw
Lugs Ø15, 3 x 120 ° for anchoring
Saltwater-resistant plastic float
Pipe 40x1, stainless steel SS 1.4571 (AISI 316Ti)
Shock absorber and weight
Oxygen sensor
a0004113-en
Fig. 11: Flow assembly COA250-B
1 Screw-in part for sensor
2Screwring
3 Meter body
4 Connection thread G¾
5 Dummy plug (connection for spray head COR3)
a0004114
Fig. 12: Bypass installation with manually actuated
valves or solenoid valves
1 Main line
2 Medium return
3 Oxygen sensor
4, 7 Manually actuated or solenoid valves
5 Flow assembly COA250-B
6 90 ° pipe bracket
8Mediumremoval
1
2
3
4
5
6
7
G1
800/31.50
500/19.69 220/8.66
Ø200/7.87
mm/inch
1
23
4
6
7
8
5

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3.4.3 Retractable assembly
The assembly is designed for installation on tanks and pipes. Suitable nozzles must be available for
this.
Install the assembly at places with constant flow. The minimum pipe diameter is DN 80 (3").
a0004117-en
Fig. 13: Permissible and impermissible sensor installation positions with retractable assembly COA451
1 Ascending pipe, best position
2 Horizontal pipe, sensor top down, impermissible due to air cushion or foam bubble forming
3 Horizontal pipe, installation with permissible installation angle (acc. to sensor version)
4 Overhead installation, critical due to possible sediment buildup on fluorescence cap
5 Down pipe, impermissible
!Note!
• Do not install the assembly at places, where air cushions or foam bubbles can be formed or where
suspended particles can settle on the sensor optics (→å13).
• Measuring errors can occur, if:
– the sensor is not immersed into the medium
– suspended particles are settled on the sensor membrane
– the sensor is installed overhead.
3.5 Post-installation check
• Sensor and cable undamaged?
• Fluorescence cap undamaged?
• Compliance with permissible sensor installation position?
• Is the sensor installed in an assembly and is not suspended from the cable?
• Avoid moisture by rain by fitting the protective cap to the immersion assembly?
5
3
4
1
2
3
Detail A,
(top view)
Detail A, rotated
(side view)
90°

Wiring Oxymax W COS61
14 Endress+Hauser
4 Wiring
#Warning!
• The electrical connection must only be carried out by an electrical technician.
• The electrical technician must have read and understood the instructions in this manual and must
adhere to them.
• Ensure that there is no voltage at the power cable before beginning the connection work.
4.1 Direct connection to the transmitter
• COS61 works with the additional 15 V power supply from Liquisys.
• Check the wiring or change the wiring as follows (see Operating Instructions COM223/253):
– Connect the yellow cable cores to terminal 85 (+15 V).
– Connect terminals 86 and 0 with an additional gray wire.
4.1.1 Field installation
You connect the sensor directly to the transmitter (COM253-WX/WS) by means of the special
measuring cable with the SXP connector (→å14).
4.1.2 Panel mounting
• Remove the SXP connector (transmitter side!) from the cable.
• Refer to the following table for the cable assignment and the assigned terminals for Liquisys M
COM223-WX/WS.
• Please note that the cable assignment changes depending on the sensor version (fixed cable or
TOP68 connection).
a0004118
Fig. 14: SXP connector
Terminal
COM223
Sensor with fixed cable (OMK) Sensor with TOP68 connection (CYK71)
Core Assignment Core Assignment
85 YE +UBYE +UB
0, 86 GY 0 V WH 0 V
96 PK Comm. (digital) GN Communication (digital)
97 BU Comm. (digital) BN Communication (digital)
88 BN –UBCoax,
inner
–UB
Additional connection between terminals 86 and 0 of the transmitter necessary.

Oxymax W COS61 Wiring
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4.2 Connection via junction box
To extend the sensor connection beyond the length of the fixed cable, the connection has to take
place using a junction box VS (→å15, →å16).
Always connect the sensor cable to the junction box with the SXP connector.
The extension to the transmitter depends on the transmitter version, i.e. field device or
panel-mounted instrument.
4.3 Post-connection check
a0004129-en
Fig. 15: Junction box VS to the field device
1 SXP connector to the field device
2 SXP connector from the sensor
a0004130
Fig. 16: Junction box VS to the panel-mounted
instrument
2 SXP connector from the sensor
3 Special measuring cable to the transmitter (OMK)
4 Transmitter connection compartment
Instrument status and specifications Remarks
Are the sensor, assembly, junction box or cable damaged? Visual inspection
Electrical connection Remarks
Does the supply voltage of the transmitter match the specifications on the
nameplate?
110/230 V AC
24 V AC/DC
Are the installed cables strain-relieved and not twisted ?
Is the cable type route completely isolated? Power cable/weak current cable
Are the power supply and signal cable correctly connected to the
transmitter?
Use the connection diagram of COM 2x3.
Are all the screws terminals properly tightened?
Are all the cable entries installed, tightened and sealed? For cable entries lateral: cable loops
downwards for water to be able to drip off.
Are all the cable entries installed downwards or lateral?
1
2
82 / 3.23
80 / 3.15
mm / inch
3
2
YE
GY
PK
BU
BN
GN
WH
87
0
96
97
88
19
18
4

Device description Oxymax W COS61
16 Endress+Hauser
5 Device description
5.1 Sensor design
The sensor consists of the following function units:
•Sensorshaft
• Sensor head with optics (emitter and detector)
• Fluorescence cap
• Protection guard
!Note!
• Alternatively to the protection guard, you can use a spray head COR3 (optional, see "Accessories")
for use in immersed operation with cleaning function.
a0004151
Fig. 17: Sensor design
1 Sensor cable
2 Sensor shaft
3O-ring
4 Protection guard
5 Threaded connection
6 Detector
7 Emitter diode
8 Fluorescence cap
1
2
3
4
5
6
7
8

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5.2 Measuring principle
5.2.1 Oxygen measurement based on the principle of fluorescence
quenching
• Sensor design:
– Oxygen-sensitive molecules (markers) are integrated in an optically active layer (fluorescence
layer).
– The surface of the fluorescence layer is in contact with the medium.
– The sensor optics are directed at the underside of the fluorescence layer.
• There is an equilibrium between the oxygen partial pressure in the medium and that in the
fluorescence layer:
– If the sensor is immersed in the medium, the equilibrium is established very quickly.
• Measuring process:
– The sensor optics send green light pulses to the fluorescence layer.
– The markers "answer" (fluoresce) with red light pulses.
– The duration and intensity of the response signals is directly dependent on the oxygen contents
and the partial pressure.
– If the medium is free from oxygen, the response signals are long and very intense.
– Oxygen molecules "quench" the marker molecules. As a result, the response signals are shorter
and less intense.
• Measurement result:
– The sensor returns a signal that is in proportion to the oxygen concentration in the medium.
– The fluid temperature and air pressure are already calculated in the sensor.
5.2.2 Fluorescence cap
The oxygen dissolved in the medium is diffused into the fluorescence cap.
Suitable flow is not necessarily mandatory but it does improve the speed at which the measuring
system responds and ensures a more representative measured value compared to a measurement in
static medium.
The cap is only permeable for dissolved gases. Other substances dissolved in the liquid phase e.g.
ionic substances, will not penetrate through the membrane. Therefore, medium conductivity has
no impact on the measuring signal.
5.3 Calibration
Calibration is a means of adapting the transmitter to the characteristic values of the sensor.
Normally, sensor calibration is seldom necessary. It is necessary after:
• Changing the fluorescence cap
Within the framework of system monitoring and supervision, for example, the calibration can also
be cyclically monitored (at typical time intervals, depending on operating experience) or renewed.
!Note!
Ideally, use the calibration vessel (see Accessories) for calibration.

Device description Oxymax W COS61
18 Endress+Hauser
5.3.1 Types of calibration
Types of calibration:
• Air (preferably saturated water vapor, e.g. near the water surface)
– Measured values between 75 and 140 % SAT result in the calibration of the measured value at
air
– Measured smaller than 10 % SAT result in the calibration of the zero point
• Air-saturated water
– Like air calibration
• Reference measured value (entry at transmitter, sensor remains in the medium).
– Measured values between 75 and 140 % SAT result in the calibration of the measured value to
the reference value while maintaining the zero point
– Measured values smaller than 10 % SAT result in the calibration of the measured value to the
reference value while maintaining the measured value at air
If necessary, calibrate COS61 practically:
•Intheair (water-vapor saturated) type of calibration in order to calibrate the measured value at
air.
•Intheair-saturated water type of calibration, but while using oxygen-free water, (see "Sensor
check" section), to calibrate the zero point.
5.3.2 Calibration intervals
1. If you want to calibrate the sensor in the meantime due to a special application and/or a special
type of installation, you can determine the intervals with the following method:
2. Check the sensor one month after its being put into operation by taking it out of the fluid,
drying it and then measuring the oxygen saturation index at air after 10 minutes.
Decide using the results:
a. If the measured value is not at 100 ±2 %SAT, you have to calibrate the sensor.
b. Otherwise, double the length of time to the next inspection.
3. Proceed as per Point 1 after two, four and/or eight months. In this way, you can determine
the optimum calibration interval for your sensor.
!Note!
Be sure to calibrate the sensor at least once a year.
5.3.3 Calibration in air
1. Remove the sensor from the medium.
2. Clean the outside of the sensor with a damp cloth. Then dry the sensor membrane e.g. by using
a tissue.
3. Then wait while the sensor adjusts to the temperature of the ambient air. This takes about 20
minutes. Check that the sensor is not in direct sunlight during this time.
4. If the measured value display on the transmitter is stable, carry out the calibration in
accordance with the Operating Instructions of the transmitter.
5. Place the sensor in the medium again.
!Note!
Make sure you comply with the instructions for calibration in the Operating Instructions of the
transmitter.
5.3.4 Calculation example for the calibration value
As a check, you can calculate the expected calibration value (transmitter display) as shown in the
following example (salinity is 0).

Oxymax W COS61 Device description
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1. Determine:
– the sensor temperature (air temperature for the calibration type "air", water temperature for
the calibration type "air-saturated water")
– the altitude above sea level
– the current air pressure (=rel. air pressure to sea level) at the time of calibration. (If
undeterminable, use 1013 hPa.)
2. Define:
–thesaturationvalueSacc. to the first table
– the factor Kacc. to the second table
3. Determine:
–L= current air pressure in bar (1013 hPa=1.013 bar, if unknown)
4. Calculate the calibration value C:
C = S .K .L
Example
• Air calibration at 18 °C (64 °F), altitude 500 m (984 ft) above sea level, current air pressure
1009 hPa=1.009 bar (15 psi)
• S = 9.45 mg/l, K = 0.943, L = 1.009
Calibration value C = 9.17 mg/l.
Temperature
[°C (°F)]
S
[mg/l]1)
1) mg/l = ppm
Temperature
[°C (°F)]
S
[mg/l]
Temperature
[°C (°F)]
S
[mg/l]
Temperature
[°C (°F)]
S
[mg/l]
0 (32) 14.64 11 (52) 10.99 21 (70) 8.90 31 (88) 7.42
1 (34) 14.23 12 (54) 10.75 22 (72) 8.73 32 (90) 7.30
2 (36) 13.83 13 (55) 10.51 23 (73) 8.57 33 (91) 7.18
3 (38) 13.45 14 (57) 10.28 24 (75) 8.41 34 (93) 7.06
4 (39) 13.09 15 (59) 10.06 25 (77) 8.25 35 (95) 6.94
5 (41) 12.75 16 (61) 9.85 26 (79) 8.11 36 (97) 6.83
6 (43) 12.42 17 (63) 9.64 27 (81) 7.96 37 (99) 6.72
7 (45) 12.11 18 (64) 9.45 28 (82) 7.82 38 (100) 6.61
8 (46) 11.81 19 (66) 9.26 29 (84) 7.69 39 (102) 6.51
9 (48) 11.53 20 (68) 9.08 30 (86) 7.55 40 (104) 6.41
10 (50) 11.25
Altitude
[m (ft)]
KAltitude
[m (ft)]
KAltitude
[m (ft)]
KAltitude
[m (ft)]
K
0 1.000 550 (1,800) 0.938 1050 (3,400) 0.885 1550 (5,100) 0.834
50 (160) 0.994 600 (2,000) 0.932 1100 (3,600) 0.879 1600 (5,300) 0.830
100 (330) 0.988 650 (2,100) 0.927 1150 (3,800) 0.874 1650 (5,400) 0.825
150 (500) 0.982 700 (2,300) 0.922 1200 (3,900) 0.869 1700 (5,600) 0.820
200 (660) 0.977 750 (2,500) 0.916 1250 (4,100) 0.864 1750 (5,700) 0.815
250 (820) 0.971 800 (2,600) 0.911 1300 (4,300) 0.859 1800 (5,900) 0.810
300 (980) 0.966 850 (2,800) 0.905 1350 (4,400) 0.854 1850 (6,100) 0.805
350 (1,200) 0.960 900 (3,000) 0.900 1400 (4,600) 0.849 1900 (6,200) 0.801
400 (1,300) 0.954 950 (3,100) 0.895 1450 (4,800) 0.844 1950 (6,400) 0.796
450 (1,500) 0.949 1000 (3,300) 0.890 1500 (4,900) 0.839 2000 (6,600) 0.792
500 (1,600) 0.943

Commissioning Oxymax W COS61
20 Endress+Hauser
6 Commissioning
6.1 Function check
Before first commissioning, check if:
• the sensor is correctly installed
• the electrical connection is correct.
If using an assembly with automatic cleaning, check the correct water connection at the assembly
rinse connection.
#Warning!
Danger of medium leaking off
Before applying compressed air to an assembly with cleaning facility, make sure the connections are
correctly fitted. Otherwise, the assembly may not be insert into the process.
6.2 Calibration
The sensor is calibrated at the factory. A new calibration is only needed in special situations.