wtw TriOxmatic 700IN User manual

D. O. probe
TriOxmatic®700IN
1
ba25315e03 05/2003
Operating manual

2
Accuracy when
going to press The use of advanced technology and the high quality standard of our instruments are the result of a
continuous development.
This may result in differences between this operating
manualandyourinstrument.Also,wecannotguaranteethat
there are absolutely no errors in this manual. Therefore, we
aresure you willunderstand thatwecannot acceptany legal
claims resulting from the data, figures or descriptions.
Copyright © Weilheim 2000, WTW GmbH
Reprinting - even as excerpts - is only allowed with the
explicit written authorization of WTW GmbH, Weilheim.
Printed in Germany.

Contents
3
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Overall view of the D. O. probe TriOxmatic®700IN . 5
1.2 Construction of the D. O. probe TriOxmatic®700IN . 6
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . 8
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Commissioning / Readiness for measuring . . . . . . . 11
3.3 Recommended fields of application . . . . . . . . . . . .11
3.4 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.5 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.6 Exterior cleaning and function check . . . . . . . . . . . .12
3.7 Cleaning with normal operation
(e.g. domestic sewage) . . . . . . . . . . . . . . . . . . . . . . 14
3.8 Storing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4 Maintenance, cleaning, disposal, spare parts 17
4.1 Replacing the electrolyte solution and the
membrane head . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2 Cleaning the electrodes . . . . . . . . . . . . . . . . . . . . . . 23
4.2.1 Cleaning of the platinium working electrode 25
4.2.2 Cleaning the counter electrode in the
glass beaker . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3 Refilling the membrane head . . . . . . . . . . . . . . . . .29
4.4 Checking whether the probe is zero current free . . 32
4.5 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.6 Maintenance and spare parts . . . . . . . . . . . . . . . . . 33
5 What to do if ... . . . . . . . . . . . . . . . . . . . . . . . . . 35
6 Recommended accessories . . . . . . . . . . . . . . 39
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . 41
7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
7.2 Measuring conditions . . . . . . . . . . . . . . . . . . . . . . . 43
7.3 Characteristics when delivered . . . . . . . . . . . . . . . .44
7.4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Contents
4

Overview
5
1Overview
1.1 Overall view of the D. O. probe
TriOxmatic®700IN

Overview
6
1.2 Construction of the D. O. probe
TriOxmatic®700IN
1 Protection cap (for transport and storage)
2 Protection hood
3 Membrane head, WP 600
4Shaft
5 Closing head
6 Protection ring for G1 thread
7 Working electrode (platinium cathode)
8 Isolator
9 Counter electrode (silver anode)
123 5 64
789

Safety
7
2 Safety
This operating manual contains basic instructions that you
must follow during the commissioning, operation and
maintenance of the probe. Consequently, all responsible
personnel must read this operating manual before working
with the probe. The operating manual must always be
available within the vicinity of the probe.
Target group The D. O. probe was designed for use with online
instrumentation - mostly in waste water treatment plants.
Thus, we assume that, as a result of their professional
training and experience, the operators will know the
necessary safety precautions to take when handling
chemicals.
Safety instructions In the various chapters of this operating manual, the
following safety instructions point out the different degrees
of danger:
Warning
indicates safety instructions which must be adhered to
precisely to rule out possible serious hazards to persons.
Caution
indicates safety instructions which must be adhered to
precisely to avoid slight injuries, damage to your equipment
or environmental harm.
Other Notes
Note
indicates notes that draw your attention to special features.
Note
indicates cross references to other documents, e. g.
operating manuals.

Safety
8
2.1 Authorized use
Thetechnical specificationsasgiveninchapter7TECHNICAL
DATA must be observed. Only the operation and running of
the probe according to the instructions given in this
operating manual is authorized.
Any other use is considered unauthorized.
2.2 General safety instructions
The probe left the factory in a safe and secure technical
condition.
Function and
operating safety The smooth functioning and operational safety of the probe can only be guaranteed if the generally applicable safety
measures and the specific safety instructions in this
operating manual are followed during operation.
The smooth functioning and operational safety of the probe
can only be guaranteed under the environmental and
electrical operating conditions that are specified in chapter 7
TECHNICAL DATA.
The temperature specified for using the probe (chapter 7
TECHNICAL DATA) has to be observed. Protect your probe
especially against frost or overheating.
Caution
The probe is only allowed to be opened by personnel
authorized by WTW.

Safety
9
Safe operation If safe operation is no longer possible, the probe must be
taken out of service and secured against inadvertent
operation!
Safe operation is no longer possible if the probe
lhas been damaged in transport
lhas been stored under adverse conditions for a lengthy
period of time
lis visibly damaged
lno longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the
probe.
Obligations of the
purchaser The purchaser of this probe must ensure that the following laws and guidelines are observed when using dangerous
substances:
lEEC directives for protective labor legislation
lNational protective labor legislation
lSafety regulations
lSafety datasheets of the chemical manufacturers.

Safety
10

Commissioning
11
3 Commissioning
3.1 Scope of delivery
lTriOxmatic®700IN with accessory kit ZBK 600
(with 1.5 m cable length: protection ring for the G1 thread
included)
lThe probes are filled with electrolyte and are equipped
with a protection hood and a protection cap.
3.2 Commissioning / Readiness for measuring
Note
Recommendation for precision measurements:
Recalibrate the next day or let the probe polarize for the
night.
3.3 Recommended fields of application
On-line measurements in rivers, lakes and waste water
and in activated sludge basins of waste water treatment
plants.
3.4 Calibration
Note
For calibrating, please refer to the operating manual of the
measuring instrument.
1Connect the probe to the measuring instrument.
2 Take off the gray protection cap.
3Der Sensor ist nach einer Verzögerungszeit von
2 Minuten meßbereit.
4 Calibrate.

Commissioning
12
3.5 Measuring
Provide the necessary minimum flow (chapter 7 TECHNICAL
DATA), e.g.:
lthe flow velocity of the water is sufficient
lpull the probe slowly through the water by hand
lthe turbulence in the activated sludge basin is sufficient.
3.6 Exterior cleaning and function check
The function check is the simplest way of letting you know
whether the probe needs to be cleaned and calibrated.
Note
The function check can either be performed in water vapor-
saturated air or in air-saturated water.
In the case of air temperatures under 5 °C we recommend
to perform the function check not in air but in air-saturated
water that has a higher temperature.
Function check in
water vapor-
saturated air
Proceed as follows:
1Take the probe out of the measuring solution and
position it approx. 2 cm above a water surface, best
in a narrow bucket or similar container with water.
When doing so, no liquid should be brought on the
membrane.

Commissioning
13
Wait at least 15 min for adjustment.
Note
If the measured value is within the accuracy tolerance
required by the user it is not necessary to clean or
recalibrate the probe.
Example:
5Switch the measuring instrument to the % saturation
operating mode. Read the measured value and
determine whether it lies within the range of precision
required by the user.
Required accuracy: 5 %
Measured value in air: 97 % saturation
Þ no cleaning or recalibrating required
(the measuring error is within the required
accuracy tolerance)
Note:
If the temperature difference between the
measuring solution and the air above the water
surface is too high, an adjusting time of more
than 15 min may be necessary.

Commissioning
14
Function check in
air-saturated water In the case of air temperatures under 5 °C do not perform the function check in air but in air-saturated water that has a
higher temperature. You obtain air-saturated water by
pouring water several times in and out of two vessels so that
it sparkles.
Then immserse the probe in a vessel with air-saturated
water and perform the function check as described above.
3.7 Cleaning with normal operation
(e.g. domestic sewage)
Cleaning and calibrating is required:
lapprox. every 4 to 6 weeks
lif the measured values are too low
Thoroughly rinse with deionized water.
Contamination Cleaning procedure
Sludge and removable
sediment Warm tapwater with washing- up liquid, a smooth cloth or a
smooth sponge
Salt and/or lime sediment Acetic acid (w = 25 %),
a smooth cloth or a smooth
sponge
1Screw off the protection hood.
Exterior
cleaning

Commissioning
15
Caution
Clean the membrane very carefully!
The membranemaybedamagedbysharp-edgedobjectsor
when lying on stones.
2Carefully clean the probe shaft and the membrane.
3Clean the protection hood as well.
4Screw on the protection hood again.
5Rinse the probe with clear tapwater.

Commissioning
16
Wait at least 15 minutes for adjustment, then calibrate the
probe.
Note
For calibrating the probe refer to the relevant operating
manual of the industrial monitor.
Note
Maintenance of the probe is required (see chapter 4
MAINTENANCE, CLEANING, DISPOSAL, SPARE PARTS) if:
lthe membrane is damaged (leakage display)
lthe probe cannot be calibrated any more.
3.8 Storing
Store the probe with the gray protection cap put on.
6Carefully dry the membrane using a lint-free paper
towel.
Temperature: -5 °C to +50 °C
Position: any

Maintenance, cleaning, disposal, spare parts
17
4 Maintenance, cleaning, disposal,
spare parts
4.1 Replacing the electrolyte solution and the
membrane head
WTW delivers the probe ready for operation
An exchange is necessary if:
lthe membrane is damaged (leakage display)
lthemembraneisstronglycontaminated;theprobecannot
be calibrated
lthe electrolyte solution is depleted.
Warning
Contact with the measuring solution can endanger the user!
Take protective measures suitable for the kind of measuring
solution (protective clothes, eye protectors etc.).
Warning
The ELY/A electrolyte solution is strongly alkaline!
lKeep out of the reach of children!
lWear suitable gloves and eye/face protection!
lAfter contact with eyes and skin rinse immediately with
plenty of water!
lAfter contact with the eyes seek medical advice!
ELY/A Xi
Irritating
R: 36/38
S: 2-26-27-37/39

Maintenance, cleaning, disposal, spare parts
18
Caution
For all maintenance work, disconnect the probe from the
instrument!
1Disconnect the probe from the instrument.
2Screw off the membrane head.
3Thoroughly rinse the probe head with deionized
water.

Maintenance, cleaning, disposal, spare parts
19
Warning
Observe the warning on the ELY/A bottle!
4Carefully wipe and dry the counter electrode using a
paper towel.
5Moisten the new membrane with some drops of the
ELY/A electrolyte solution.

Maintenance, cleaning, disposal, spare parts
20
Note
Always use a new membrane head!
6Fill the membrane head with electrolyte solution.
7Remove air bubbles by careful knocking.
8Rinse the probe head with electrolyte solution.