Endress+Hauser OxyMax W COS 71 User manual

Quality made by
Endress+Hauser
ISO 9001
BA 286C/07/en/07.01
Nr. 51506699 OxyMax W COS 71
Sensor for Measuring
Dissolved Oxygen
Operating Instructions

OxyMax W COS 71
Endress+Hauser
Table of contents
1 Safety instructions . . . . . . . . . . . . . . . . . 2
1.1 Notes on safety conventions and icons . . . . . . 2
1.2 Designated use . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Installation, commissioning and operation . . . 2
1.4 Operational safety . . . . . . . . . . . . . . . . . . . . . . 3
1.5 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.6 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Identification . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Product structure . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . 4
3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Measuring device . . . . . . . . . . . . . . . . . . . . . . 5
3.2 Installation conditions . . . . . . . . . . . . . . . . . . . 6
3.3 Installation location and position . . . . . . . . . . . 7
3.4 Sensor design and functional description . . . . 9
3.5 Post-installation check . . . . . . . . . . . . . . . . . . 11
4 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Direct connection to the transmitter . . . . . . . . 12
4.2 Connection via the junction box VS . . . . . . . . 12
4.3 Post-connection check . . . . . . . . . . . . . . . . . 13
5 Commissioning . . . . . . . . . . . . . . . . . . 14
5.1 Function check . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Polarisation . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6 Maintenance . . . . . . . . . . . . . . . . . . . . . . 17
6.1 Cleaning the outside of the sensor . . . . . . . . . 17
6.2 Regeneration . . . . . . . . . . . . . . . . . . . . . . . . . 18
7 Accessories . . . . . . . . . . . . . . . . . . . . . . . 20
7.1 Connection accessories . . . . . . . . . . . . . . . . . 20
7.2 Installation accessories . . . . . . . . . . . . . . . . . 20
7.3 Spare parts kit . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.4 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.5 Measurement and controlling . . . . . . . . . . . . . 20
8 Troubleshooting . . . . . . . . . . . . . . . . . . 21
8.1 Troubleshooting instructions . . . . . . . . . . . . . . 21
8.2 Sensor test . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8.3 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
9 Technical data . . . . . . . . . . . . . . . . . . . . 23
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

1 Safety instructions OxyMax W COS 71
2Endress+Hauser
1 Safety instructions
1.1 Notes on safety conventions and icons
#Warning!
This symbol alerts you to hazards which could cause serious injuries as well as
damage to the instrument 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.
1.2 Designated use
The oxygen sensor COS 71 is suitable for continuous measurement of dissolved oxygen
traces in water.
The main application is the trace measurement of dissolved oxygen in boiler feed water
of power plants.
#Warning!
•If the device is used for any application other than those described in this manual, it
may lead to unsafe and improper functioning of the measuring system and is therefore
not permitted.
•Make sure you strictly adhere to the warnings and notes in these
Operating Instructions.
•The manufacturer is not liable for damage caused by improper use or use other than
that for which it is intended.
1.3 Installation, commissioning and operation
#Warning!
•Only trained technical personnel may carry out installation, electrical connection,
commissioning, operation and maintenance of the measuring system. The technical
personnel must be authorised to do this by the system operator.
•Technical personnel must be familiar with the instructions in this manual and must
adhere to them.
•Before switching on the system, check all the connections again for correctness.
•Do not operate damaged sensors. Indicate them as being defective.
•Measuring point faults may only be remedied by authorised and trained personnel.
•If faults cannot be repaired, the measuring device must be taken out of service and
secured against unintentional commissioning.
•Repairs may only be carried out by the manufacturer or by the Endress+Hauser
service organisation.

OxyMax W COS 71 1 Safety instructions
Endress+Hauser 3
1.4 Operational safety
The COS 71 sensor is operationally reliable and is made to the state of the art.
The appropriate regulations and EC directives have been met.
As the user, you are responsible for complying with the following safety conditions:
•Explosion protection regulations
•Installation instructions
•Operating instructions for the assembly and its materials
•Local prevailing standards and regulations
1.5 Return
If the device requires repair, please send the sensor clean (see Seite 17) to the
appropriate Endress+Hauser sales offices. Please use the original packaging where
possible.
Please add the filled in »Declaration of contamination« (copy the last but one page of
this manual) to the packing of the sensor and add it also to the shipping documents.
1.6 Disposal
Defective, non-repairable sensors must be disposed of.
Please keep to the local disposal regulations!

2 Identification OxyMax W COS 71
4Endress+Hauser
2 Identification
2.1 Product structure
2.2 Scope of delivery
!Note!
•Make sure the packaging is undamaged!
Inform the post office or the courier of any damage to the packing.
Keep the damaged packaging until the matter has been cleared.
•Make sure the contents are undamaged!
Inform the post office or the courier of any damage to the delivered contents.
Keep the damaged products until the matter has been cleared.
•Use the delivery papers to check that the scope of delivery is complete.
The following items are included in the delivery:
•1 oxygen sensor COS 71 with transport protection cap for membrane protection
•Accessories set COY 31-S-Z with the following contents:
–1 spare replacement cartridge COY 31-S-WP
–10 plastic ampoules containing electrolyte COY 3-F
–1 sealing kit COY 31-OR with 3 O-rings
–6 polishing sheets
•Operating Instructions BA 286C/07/en
If you have questions, please contact your supplier or your nearest
Endress+Hauser sales office (see the back page of this Operating Instructions).
Certifikate
A Version for non-hazardous area
Cable length
0 Connection cable 1,5 m
2 Connection cable 7 m
4 Connection cable 15 m
8 Cable not included (only for TOP 68 version)
9 Special version
Cable connection
F Fixed cable connection
S Cable connection via TOP 68 connector (only when using Liquisys M COM 223/253-WX/WS)
COS 71- Complete order code

OxyMax W COS 71 3 Installation
Endress+Hauser 5
3Installation
3.1 Measuring device
A complete measuring system comprises:
•Oxygen sensor OxyMax W COS 71
•Oxygen transmitter Liquisys M COM 223/253-WX/WS
Optional:
•Flow assembly FlowFit W COA 260
•Junction box VS
Fig. 3.1: Complete measuring device for COS 71 with Liquisys M COM 223/253-WX/WS
1 Junction box VS (only if cable extension required)
2 Transmitter Liquisys M COM 223/253-WX/WS
3 Flow assembly COA 260
4 Oxygen sensor COS 71
C07-COS71xxx-14-05-00-xx-001.EPS
12
3
4

3 Installation OxyMax W COS 71
6Endress+Hauser
3.2 Installation conditions
3.2.1 Installation dimensions
Fig. 3.2: Dimensions COS 71
fixed cable version
Fig. 3.3: COS 71 with TOP 68 plug-in head and
TOP 68 plug-in cable
220
Ø40
186
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C07-COS31xxx-06-05-00-xx-002.EPS

OxyMax W COS 71 3 Installation
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3.3 Installation location and position
The sensor can be installed up to the horizontal in an assembly, support or a suitable
process connection (Fig. 3.4). Other angles are not permissible. Do not install the
sensor overhead.
Permissible installation .
Fig. 3.4: Permissible installation positions for the COS 71 oxygen sensor
!Note!
Make sure you comply with the instructions for installing sensors. You will find them in
the Operating Instructions for the assembly used.
Installing a
measuring point
For a complete installation of a measuring point, proceed as follows:
1. Installing the flow assembly.
2. Installing and connecting the oxygen sensor.
"Caution!
•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.
3.3.1 Installation example
Flow operation
Install the COA 260 flow assembly acc. to Fig. 3.5 to ensure a total height of 540 mm for
sensor installation or removal. The inlet is at the bottom of the assembly, the outlet lateral
of the assembly. If necessary use devices for cooling the medium resp. for pressure
minimisation to ensure not to exceed the maximum permissible values of 50 °C
resp. 10 bar.
C07-COS31xxx-11-05-00-en-001.EPS
Permissible angle of installation

3 Installation OxyMax W COS 71
8Endress+Hauser
Please pay attention to the following notes if the assembly is used in a pressure system
with reflow (Fig. 3.6) instead of free outlet:
"Caution!
For pressures > atmospheric pressure
•Pressurisation and work at a constant overpressure up to 10 bar poses no problems.
•Rapid pressure loss at the measuring point leads to air degassing in the electrolyte
due to the sudden reductions in solubility. This could lead to a swelling of the sensor
membrane.
Avoid this problem by keeping up the pressure on the sensor. In the case of rapid
pressure loss e.g. during maintenance work on the pipeline close all the valves
(manual mode: manually actuated valves, automatic mode: solenoid valves, see Fig.
3.6, Pos. 4 and 5) of the assembly.
Fig. 3.5: Flow assembly COA 260 Fig. 3.6: Bypass installation with manually
actuated valves or solenoid valves
1 Cap 1 Main line
2 Pressing screw 2 Medium return
3 Intermediary 3 Flow assembly COA 260
4 Flow vessel 4, 5 Manually actuated or solenoid valves
6 Flow assembly COA 250-A
6 Medium removal
Ø60
400
C07-COA260xx-11-07-00-xx-001.EPS
1
2
3
4
Required
total height
for sensor
installation or
removal
540 mm
1
23
4
5
6
C07-COA260xx-11-05-00-xx-001.EPS