Xylem WTW SensoLyt 700 SW User manual

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TriOxmatic®700
TriOxmatic®700 SW
43
Operating manual
D. O. sensor
TriOxmatic 700
TriOxmatic 700 SW

TriOxmatic®700 (SW)
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Accuracy when going to
press
The use of advanced technology and the high quality standard of our
instruments are the result of continuous development. This may result
in differences between this operating manual and your instrument.
Also, we cannot guarantee that there are absolutely no errors in this
manual. Therefore, we are sure you will understand that we cannot
accept any legal claims resulting from the data, figures or descriptions.
Note
The latest version of the present operating manual can be found on the
Internet under www.WTW.com.
Copyright ©Weilheim 2005, WTW GmbH
Reprinting - even as excerpts - is only allowed with the explicit written
authorization of WTW GmbH, Weilheim.
Printed in Germany.

TriOxmatic®700 (SW) Contents
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TriOxmatic®700 (SW) - Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
1.1 Structure of the TriOxmatic®700 (SW) . . . . . . . . . . . . . 47
1.2 Recommended fields of application . . . . . . . . . . . . . . . . 48
1.3 Instrument identification . . . . . . . . . . . . . . . . . . . . . . . . . 48
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
2.1 General information on safety . . . . . . . . . . . . . . . . . . . . 49
2.2 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
2.3 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 50
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.3 Commissioning / Getting the instrument ready for
measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4 Measuring / Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.1 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.2 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.2.1 General information on calibration . . . . . . . . . . 54
4.2.2 Calibration in water vapor-saturated air . . . . . . 55
4.3 Function check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
5 Maintenance, cleaning, disposal, and replacement . . 59
5.1 General maintenance instructions . . . . . . . . . . . . . . . . . 59
5.2 Cleaning the sensor shaft and membrane . . . . . . . . . . . 59
5.3 Changing the electrolyte and membrane cap . . . . . . . . 62
5.4 Cleaning the electrodes . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.4.1 Cleaning the gold working electrode . . . . . . . . . 69
5.4.2 Cleaning the silver counter electrode . . . . . . . . 70
5.5 Checking the sensor for freedom from zero-current . . . 76
5.6 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
5.7 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
5.8 Maintenance equipment and replacement parts . . . . . . 78
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
7.2 Measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . 83
7.3 Characteristic data on delivery . . . . . . . . . . . . . . . . . . . . 84
7.4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Contents TriOxmatic®700 (SW)
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TriOxmatic®700 (SW) Overview
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1Overview
1.1 Structure of the TriOxmatic®700 (SW)
Fig. 1-1 Structure of the D. O. sensor (example: TriOxmatic®700)
1Protective hood
2WP 600 membrane cap
3Electrode unit
4Shaft
Electrode unit:
5Gold working electrode (cathode)
6Insulator
7Silver counter electrode (anode)
8Reference electrode
334
6
5
78
2
1

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1.2 Recommended fields of application
TriOxmatic 700 Stationary measurements in water/wastewater applications.
TriOxmatic 700 SW Stationary measurements in seawater, aquaculture.
1.3 Instrument identification
Instrument identification The instrument designation (end of name "-99" for SW model) is
impressed on the plug end of the cable. The series number is engraved
in the closing head. Have these designations ready in case of queries
to the WTW service department.

TriOxmatic®700 (SW) Safety
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2 Safety
2.1 General information on safety
These safety instructions contain all instructions that have to be
followed for a safe operation of the TriOxmatic®700 (SW) D. O. sensor.
Before starting any work with the TriOxmatic®700 (SW), carefully read
the safety instructions and strictly follow all protective measures
mentioned.
Always store and make available these safety instructions together with
the operating manual in the vicinity of the place of installation as
possible.
General safety
instructions
Safety instructions in this operating manual can be recognized by the
warning symbol (triangle) in the left column. The signal word (e. g.
"Caution") indicates the level of the danger:
Warning
indicates instructions that must be followed precisely in order to
prevent serious dangers to persons.
Caution
indicates instructions that must be followed precisely in order to
avoid slight injuries or damage to the instrument or the
environment.
Other labels
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating
manuals.
2.2 Authorized use
The authorized use of the TriOxmatic®700 (SW) is stationary D. O.
measurement.
The technical specifications according to chapter 7 TECHNICAL DATA
must be observed. Only operation according to the instructions given in
this operating manual is considered to be authorized.
Any other use is considered to be unauthorized. Unauthorized use
invalidates any claims with regard to the guarantee.

Safety TriOxmatic®700 (SW)
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2.3 General safety instructions
Function and
operational safety
The sensor left the factory in a safe and secure technical condition.
The failure-free function and operational safety of the sensor is only
guaranteed if the generally applicable safety measures and the special
safety instructions in this operating manual are followed during its use.
The failure-free function and operational safety of the sensor is only
guaranteed under the environmental conditions that are specified in
chapter 7 TECHNICAL DATA.
The specified temperature (chapter 7 TECHNICAL DATA) must be
maintained during the operation and transport of the sensor. Protect
the sensor, particularly against frost or overheating.
Safe operation If safe operation is no longer possible, the sensor must be taken out of
operation and secured against inadvertent operation.
Safe operation is no longer possible if the sensor:
has been damaged in transport
has been stored under adverse conditions for a lengthy period of
time
is visibly damaged
no longer operates as described in this manual.
If you are in any doubt, contact the supplier of your sensor.
Obligations of the
operator
The operator of the sensor must ensure that the following rules and
regulations are followed when dealing with hazardous substances:
EEC directives for protective labor legislation
National protective labor legislation
Safety regulations
Safety data sheets of the chemical manufacturer.

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3 Commissioning
3.1 Scope of delivery
TriOxmatic®700 (SW)
The sensor is filled with electrolyte and provided with a protective
hood and protective caps.
ZBK 600 accessory kit
Operating manual.
3.2 Installation
Connection to the
measuring transmitter
The TriOxmatic®700 (SW) connection cable has a screw plug to be
connected to the Oxi input socket of a measuring transmitter. It is
connected to the terminal strip of measuring transmitters without an Oxi
input socket via the ADA/AMPH adapter.
For detailed information please refer to the operating manual of the
measuring transmitter.
Note
Do not suspend the sensor on the sensor connection cable. Use a
sensor holder or armature. Information on this and other
TriOxmatic®700 (SW) accessories is given in the WTW catalog and on
the Internet.

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3.3 Commissioning / Getting the instrument ready for
measuring
Note
For the sensor to polarize, the following conditions must be fulfilled:
The sensor is connected to the measuring transmitter
The measuring transmitter is operating
Precision
measurements
Recommendation: In order to carry out precision measurements, leave
the sensor to polarize for a longer period of time, e.g. overnight, and
recalibrate it the following day.
1Pull the protective cap off the protective hood of the sensor.
2 Leave the sensor to lie in the air for at least 60 minutes while it
is switched on (polarization).
3Calibrate the sensor (see operating manual of the measuring
transmitter).

TriOxmatic®700 (SW) Measuring / Operation
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4 Measuring / Operation
4.1 Measuring
Warning
Contact with the sample can lead to danger to the user!
Depending on the type of sample, suitable protective measures
must be taken (protective clothing, protective goggles, etc.).
For measuring submerse the operable sensor in the test sample. The
measured value is available immediately on submersing.
Note
Do not suspend the sensor on the sensor connection cable. Use a
sensor holder or armature. Information on this and other
TriOxmatic®700 (SW) accessories is given in the WTW catalog and on
the Internet.
Minimum approach flow The minimum required approach flow at the sensor must be present
during measurement (see chapter 7 TECHNICAL DATA). The minimum
approach flow can, e.g. be present due to:
natural movement of the water (flow rate, sea disturbance)
turbulences in the activated sludge basin.

Measuring / Operation TriOxmatic®700 (SW)
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4.2 Calibration
4.2.1 General information on calibration
Why calibrate? During the operation of a D.O. sensor, the slope of the D.O. sensor
changes with time. The calibration procedure determines the current
slope of the sensor.
When to calibrate? Calibrate before measuring and at regular intervals (depending on the
application).
Calibration procedure, Ideally, calibration takes place in water vapor-saturated air. To do so,
position the sensor approx. 2 cm above a water surface, for example in
a narrow bucket or similar container with water.
In the case of air temperatures under 5 °C we recommend to calibrate
not 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.
Note
For calibration the membrane always has to be clean, for calibration in
air it has to be dry. Clean contaminated sensors before calibration (see
section 5.2 CLEANING THE SENSOR SHAFT AND MEMBRANE).

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4.2.2 Calibration in water vapor-saturated air
Calibrating position
Note
In the case of air temperatures under 5 °C do not calibrate the sensor
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 immerse the sensor in a vessel with air-saturated water
(calibrating position) and calibrate as described above.
1If necessary, clean the sensor and membrane and dry the
membrane (see section 5.2 CLEANING THE SENSOR SHAFT AND
MEMBRANE).
2Bring the sensor into the calibrating position.
To do so, position the sensor 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.
3 Start calibration as described in the operating manual of the
measuring transmitter.
2cm

Measuring / Operation TriOxmatic®700 (SW)
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4.3 Function check
The function check is the simplest way of letting you know whether the
sensor 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.
Note
The function check is carried out in the measuring mode, % saturation.
Function check in water
vapor-saturated air
Proceed as follows:
Note
If there are large temperature differences between the sample and the
air above the surface of the water, a balancing period of more than
15 minutes may be required.
1Take the sensor 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 drops of liquid
should be on the membrane.
2cm
2Wait at least 15 minutes for the temperature to adapt.
3 On the measuring transmitter, select Sättigung (unit %) and
switch to the measured value display.
4Read the measured value and determine whether it lies within
the range of precision required by the user.

TriOxmatic®700 (SW) Measuring / Operation
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Measured values within
the required precision
If the measured value lies within the range of precision required by the
user, no cleaning or recalibrating is necessary.
Example:
Required precision 5 %
Measured value in air: 97 % saturation (nominal value: 100%)
No cleaning or recalibration is necessary as the measurement error
lies within the range of precision required by the user.
Measured values
outside the required
precision
If the measured value lies outside the range of precision required by the
user, clean the sensor shaft and membrane (see section 5.2) and
calibrate the sensor (see section 4.2).
Note
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 submerse the sensor in a vessel with air-saturated water and
perform the function check as described above.

Measuring / Operation TriOxmatic®700 (SW)
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TriOxmatic®700 (SW) Maintenance, cleaning, disposal, and replacement
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5 Maintenance, cleaning, disposal, and
replacement
5.1 General maintenance instructions
Warning
Contact with the sample can lead to danger to the user!
Depending on the type of sample, suitable protective measures
must be taken (protective clothing, protective goggles, etc.).
5.2 Cleaning the sensor shaft and membrane
For normal operation (e.g. municipal wastewater), cleaning and
calibration are strongly recommended:
in the case of pollution (according to visual check)
in the case of suspected incorrect measured values (usually too low)
if the measured value lies outside the range of precision required by
the user during the function check.
Cleaning agents Contamination Cleaning agents
Sludge and loosely adhering
dirt, biological deposits
Soft cloth or soft sponge, warm
tapwater with detergent
Salt and / or lime deposits Acetic acid (volume percentage =
20 %), soft cloth or soft sponge

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Cleaning
Caution
Acetic acid irritates the eyes and the skin. When handling acetic
acid, always wear protective gloves and protective goggles.
Caution
Clean the membrane very carefully!
Make sure the membrane is not damaged, e.g. by sharp-edged
objects, by laying it on sharp stones, etc.
1Pull the sensor out of the sample.
2 Get rid of any coarse contamination on the sensor (e.g. brush
it off in a bucket of tapwater, wash it down with a hose or wash
it off with a cloth).
3Unscrew the protective hood from the sensor.
4Carefully clean the sensor shaft and membrane as specified
in the CLEANING AGENTS section.
5Then, rinse it thoroughly with tap water.
6 Also clean and rinse the protective hood.

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7Screw the protective hood back on again.
8If necessary, carefully dry the membrane with a lint-free paper
towel.
9Calibrate the sensor (see section 4.2 CALIBRATION).

Maintenance, cleaning, disposal, and replacement TriOxmatic®700 (SW)
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5.3 Changing the electrolyte and membrane cap
WTW delivers the sensor ready for operation. The electrolyte solution
and membrane cap must only be replaced if:
a calibration error occurs due to a highly contaminated
membrane
the membrane is damaged (SensLeck or SensReg message)
the electrolyte solution is depleted or the counter electrode is
poisoned (SensReg message)
after the gold working electrode and silver counter electrode have
been cleaned
Caution
Before unscrewing the membrane cap, disconnect the sensor
from the instrument. Otherwise, undesirable electrochemical
reactions can occur that may lead to the destruction of the sensor.
Note
Unscrew the membrane cap for maintenance purposes only. After
doing so, always use a new membrane cap!
Changing the electrolyte
and membrane cap 1Pull the sensor out of the sample.
2 Get rid of any coarse contamination on the sensor (e.g. brush
it off in a bucket of tap water, wash it down with a hose or wash
it off with a cloth).
3Disconnect the sensor from the instrument.
4Unscrew the protective hood from the sensor.