Xylem CellOx-325 User Manual
CellOx 325
Operating manual
Dissolved oxygen sensor
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CellOx 325
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Copyright © Weilheim 2002, WTW GmbH & Co. KG
Reprinting - even as excerpt s - is o nly allowed wit h the ex pli cit writt en a uthorization of WTW GmbH & Co. KG, Weilheim.
Printed in Germany.
CellOx 325 Contents
CellOx 325 - Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4 Measuring / Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5 Maintenance, cleaning, replacement . . . . . . . . . . . . . . . .23
5.1 General maintenance instructions . . . . . . . . . . . . . . . . . . 23
5.2 Exterior cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.3 Changing the electrolyte and membrane head . . . . . . . . 24
5.4 Cleaning the electrodes . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.5 Checking the sensor for freedom from zero-current . . . . 28
5.6 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8 Wear parts and accessories . . . . . . . . . . . . . . . . . . . . . . . 32
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Overview CellOx 325
1 Overview
Construction
213
456 87
1 WP 90 membrane cap (filled with electrolyte solution)
2 Shaft
3 Connection head
Recommended
fields of
application
4 Gold working electrode (cathode)
5 Insulator
6 Lead counter electrode (anode)
7 Ventilation area
8 Temperature sensor and auxiliary electrode
l On site measurements in rivers, lakes and wastewater
l Applications in water laboratories
l BOD measurements
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CellOx 325 Safety
2Safety
This operating manual contains special instructions that must be followed
during the operation of the Dissolved Oxygen (D.O.) sensor.
Always keep this operating manual in the vicinity of the sensor.
Special user
qualifications
General safety
instructions
The membrane cap of the D. O. sensor is filled with a small amount of an
alkaline electrolyte solution. All ma intenance work th at requir es deali ng with
the electrolyte solution must only be carried out by persons who are familiar
with the safe handling of chemicals.
The individual chapters of thi s operating manual use safety labels like t he one
below to indicate danger:
Caution
indicates instructions tha t must be f ollowed pr ecisely in order t o avoid
slight injuries or damage to the instrument or the environment.
3 Commissioning
Scope of delivery l D. O. sensor CellOx 325, filled with electrolyte solution and operable
l 3 exchange membrane caps WP 90
l Calibration and storage vessel, OxiCal
l Operating manual
Note
The membrane cap that is mounted on t he sensor for del ivery ser ves mainly
as a transport protection. Depending on the duration of the transport and storage period, it may have a shortened operational lifetime. If the measuring
system cannot be calibrated (error message on the instrument), please proceed according to section R
BRANE CAP.
EPLACING THE ELECTROLYTE SOLUTION AND MEM-
®
-SL
Getting the sensor
ready for
measuring
Connect the sensor to th e measur ing i nstr ument. The sen sor is immediatel y
ready to measure. It is not necessary to polarize the sensor.
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