SCHOTT 9009/6. User manual

ba22207e08 07/2011
9009/6.
9009/6.-ID
Operating manual
Dissolved oxygen sensor

9009/6.
18 ba22207e08 07/2011
Copyright ©2011, SI Analytics GmbH
Reprinting - even as excerpts - is only allowed with the explicit written
authorization of SI Analytics GmbH, Mainz.
Printed in Germany.

9009/6.(-ID) Contents
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9009/6.(-ID) - 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

Overview 9009/6.(-ID)
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1Overview
Construction
Automatic sensor
recognition
In the plug connector of the 9009/6.-ID sensor, data is stored for the automat-
ic sensor recognition function. Among other, this data includes the sensor
type and series number. Besides, the calibration data is written in the sensor
with every calibration procedure. When the sensor is connected, the data is
called up by the meter and used for measurement and measured value doc-
umentation. The correct data is always used automatically if the sensor is op-
erated with several meters because the data is stored in the sensor.
To be able to use the automatic sensor recognition function, a meter is
required that supports the function. More information on the automatic sensor
recognition function is given in the operating manual of the meter.
Recommended
fields of
application
On site measurements in rivers, lakes and wastewater
Applications in water laboratories
BOD measurements
1Membrane cap (filled with electrolyte solution)
2Shaft
3Connection head
4Gold working electrode (cathode)
5Insulator
6Lead counter electrode (anode)
7Ventilation area
8Temperature sensor and auxiliary electrode
213
456 87

9009/6.(-ID) Safety
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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
The membrane cap of the D. O. sensor is filled with a small amount of an
alkaline electrolyte solution. All maintenance work that requires dealing with
the electrolyte solution must only be carried out by persons who are familiar
with the safe handling of chemicals.
General safety
instructions
The individual chapters of this operating manual use safety labels like the one
below to indicate danger:
Caution
indicates instructions that must be followed precisely in order to avoid
slight injuries or damage to the instrument or the environment.
3 Commissioning
Scope of delivery D. O. sensor 9009/6., filled with electrolyte solution and operable
3 exchange membrane caps
Calibration and storage vessel, OxiCal®-SL
Operating manual
Note
The membrane cap that is mounted on the sensor for delivery serves mainly
as a transport protection. Depending on the duration of the transport and stor-
age period, it may have a shortened operational lifetime. If the measuring
system cannot be calibrated (error message on the instrument), please pro-
ceed according to section REPLACING THE ELECTROLYTE SOLUTION AND MEM-
BRANE CAP.
Getting the sensor
ready for
measuring
Connect the sensor to the measuring instrument. The sensor is immediately
ready to measure. It is not necessary to polarize the sensor.

Measuring / Operation 9009/6.(-ID)
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4 Measuring / Operation
4.1 Calibration
Note
For calibration, please refer to the operating manual of the measuring instru-
ment.
4.2 Measuring
Please note the required minimum immersion depth and minimum flow (see
chapter 7 TECHNICAL DATA).
The minimum flow can be provided in different ways, e. g.:
The flow velocity of the water to be measured is sufficient (aeration tank,
water pipe, stream)
Slowly pull the sensor through the water by hand (lake, container), or
Use a flow aid, e. g. a magnetic stirrer with stirring device (see chapter 8
WEAR PARTS AND ACCESSORIES)
4.3 Storage
Always store the sensor in the calibration vessel at a temperature of 0 to
+50 °C. Make sure that the sponge in the calibration vessel is always moist.
Calibration vessel,
OxiCal®-SL
Moisten the sponge:
Remove the cap (1).
Take out the sponge (2), wet it, then slightly squeeze it out.
Reinsert the sponge and close the calibration vessel with the cap.
12

9009/6.(-ID) Maintenance, cleaning, replacement
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5 Maintenance, cleaning, replacement
5.1 General maintenance instructions
For your safety When dealing with the OX 920 electrolyte solution, observe the following
safety instructions:
Caution
The OX 920 electrolyte solution irritates eyes and skin. When dealing
with the OX 920 electrolyte solution, observe the following points:
During working activities, always wear suitable protective gloves
and protective goggles/face shield.
If it comes into contact with the skin, rinse thoroughly with water and
immediately change contaminated clothing.
If it comes into contact with the eyes, rinse thoroughly with water
and consult a doctor.
Follow the safety datasheet.
Caution
Before all maintenance activities, disconnect the sensor from the
instrument.
Note
Information on how to order wear parts and maintenance accessories can be
found in chapter 8 WEAR PARTS AND ACCESSORIES.
5.2 Exterior cleaning
Cleaning agents
After cleaning, thoroughly rinse with deionized water and recalibrate if
necessary.
Contamination Cleaning procedures
Lime sediments Immerse in acetic acid for 1 minute (volume
share = 20 %)
Fat/oil Clean with warm water that contains wash-
ing-up liquid

Maintenance, cleaning, replacement 9009/6.(-ID)
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5.3 Changing the electrolyte and membrane head
Caution
Before starting to work with the sensor, please note the GENERAL
MAINTENANCE INSTRUCTIONS on page 23.
General
information
SI Analytics delivers the sensor ready to operate (see section 3). The elec-
trolyte solution and the membrane head must only be replaced if:
a calibration error occurs and the membrane is heavily contaminated
the membrane is damaged
the electrolyte solution is exhausted
in case of a leak message by the measuring instrument.
Changing the electrolyte solution and the membrane head
Unscrew the membrane
head.
Caution: Electrolyte solution!
For disposal of the membrane
head and electrolyte solution,
see section 5.6.
Rinse the sensor head with
deionized water.
Carefully rub and dry the
counter electrode with a lint-
free paper towel.
Immerse the sensor head in-
cluding the counter electrode
in OX 921 cleaning solution.
Allow to react for 1 to 3 min-
utes.
Thoroughly rinse the sensor
head with deionized water.
Water the counter electrode in
deionized water for at least
10 minutes.
OX 921
H O
2

9009/6.(-ID) Maintenance, cleaning, replacement
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Carefully shake off the drops
of water.
Fill a new membrane cap with
OX 920 electrolyte solution.
Remove any air bubbles by
carefully tapping the mem-
brane head. Additionally, you
can prevent air bubbles by
throwing the first fill away and
refilling the membrane head.
Thoroughly rinse the sensor
head with electrolyte solution.
Hold the sensor inclined and
screw on the membrane head
fingertight using a paper tow-
el. Excess electrolyte solution
is forced out of the ventilation
area.
Check the filling:
Inspect the face surface. No
air bubbles may be present
within the dashed circle
(approx. the black area). Air
bubbles outside this area do
not interfere.
Note
For measurements under high pressure the filling must be com-
pletely free of air bubbles.
Readiness to measure After approx. 30 to 50 minutes, the sensor is ready for operation.
Subsequently calibrate the sensor.
Note
If you want to measure very low oxygen concentrations (< 0.5 %
saturation), we recommend to let the sensor rest overnight and
then calibrate it.
OX 920
OX 920
4mm

Maintenance, cleaning, replacement 9009/6.(-ID)
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5.4 Cleaning the electrodes
Caution
Before starting to work with the sensor, please note the GENERAL
MAINTENANCE INSTRUCTIONS on page 23.
General
information
Cleaning is only required in cases of slopes that are too small or too large
(sensor cannot be calibrated) that cannot be resolved by changing the mem-
brane head and electrolyte solution.
Cleaning the electrodes
Unscrew the membrane
head.
Caution: Electrolyte solution!
For disposal of the membrane
head and electrolyte solution,
see section 5.6.
Rinse the sensor head with
deionized water.
Using the rough side of the
wet SF 300 polishing strip,
polish off any contamination
from the gold working elec-
trode using light pressure.
Caution: Do not use any con-
ventional sandpaper or glass-
fiber brushes.
Rinse the sensor head with
deionized water.
Wipe the counter electrode
with a lint-free paper towel
and carefully remove any
loose white deposits.
Immerse the sensor head in-
cluding the counter electrode
in OX 921 cleaning solution.
Allow to react for 1 to 3 min-
utes.
SF 300
OX 921

9009/6.(-ID) Maintenance, cleaning, replacement
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Thoroughly rinse the sensor
head with deionized water.
Water the counter electrode in
deionized water for at least
10 minutes.
Carefully shake off the drops
of water.
Fill a new membrane cap with
OX 920 electrolyte solution.
Remove any air bubbles by
carefully tapping the mem-
brane head. Additionally, you
can prevent air bubbles by
throwing the first fill away and
refilling the membrane head.
Rinse the sensor head with
electrolyte solution.
Hold the sensor inclined and
screw on the membrane head
fingertight using a paper tow-
el. Excess electrolyte solution
is forced out of the ventilation
area.
Check the filling:
Inspect the face surface. No
air bubbles may be present
within the dashed circle
(approx. the black area). Air
bubbles outside this area do
not interfere.
H O
2
OX 920
OX 920
4mm

Maintenance, cleaning, replacement 9009/6.(-ID)
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5.5 Checking the sensor for freedom from zero-current
The sensor is zero-current free. Checking the sensor for freedom from zero-
current is only necessary in the case of malfunctions that cannot be remedied
by exchanging the electrolyte solution and membrane head or by cleaning
the electrodes.
There are two possibilities to check the sensor for freedom from zero-current:
Measurement in a nitrogen atmosphere (recommended method)
Measurement in a sodium sulfite solution according to DIN EN 25814/
ISO 5814.
Caution
If you check the sensor according to DIN EN 25814/ISO 5814, do not
leave the sensor in the sodium sulfite solution for more than 2 minutes.
Danger of sensor poisoning!
Test criterion The sensor is OK if the measuring instrument displays < 1 % DO saturation
after 2 minutes.
Note
For measurements under high pressure the fill must be completely free of air
bubbles.
Readiness to
measure
After approx. 30 to 50 minutes, the sensor is ready for operation. Subse-
quently calibrate the sensor.
Note
If you want to measure very low oxygen concentrations (< 0.5 % saturation),
we recommend to let the sensor rest overnight and then calibrate it.

9009/6.(-ID) What to do if...
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5.6 Disposal
Caution
The OX 920 electrolyte solution irritates eyes and skin. When dealing
with the OX 920 electrolyte solution, observe the following points:
During working activities, always wear suitable protective gloves
and protective goggles/face shield.
If it comes into contact with the skin, rinse thoroughly with water and
immediately change contaminated clothing.
If it comes into contact with the eyes, rinse thoroughly with water
and consult a doctor.
Follow the safety datasheet.
Sensor and
membrane head
For disposal, unscrew the membrane head and rinse the sensor and
membrane head with water. We recommend disposing of the sensor without
the membrane head as electronic refuse. The membrane head may be
disposed of with the household refuse.
Electrolyte
solution
Disposal according to the safety data sheet.
6 What to do if...
Error symptom Cause Remedy
The sensor is in the air
and the display shows
0.0 mg/l or 0 % O2
– No connection between
measuring instrument and sensor
– Cable defective
– No electrolyte in the membrane
head
– Check connection between
measuring instrument and sensor
– Replace and refill the membrane
head (see section 5.3)
The sensor cannot be
calibrated
– Contaminated membrane head
– Electrolyte depleted
– Replace and refill the membrane
head (see section 5.3).
Subsequently, wait for 30 to
50 min and recalibrate.
The sensor still cannot
be calibrated after
changing the electrolyte
and membrane head
– Contaminated electrodes or
sensor toxification
– Clean the electrodes (see
section 5.4)
Leak display appears – Membrane head not screwed on
tight enough
– Hole in the membrane
– Screw membrane head tighter
– Replace and refill the membrane
head (see section 5.3)
Incorrect temperature
display
– Temperature sensor defective – Return the sensor
Mechanical damage to
the sensor
– Return the sensor

Technical data 9009/6.(-ID)
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7 Technical data
General features Measuring principle Membrane covered galvanic sensor
Temperature compensation IMT compensation
(calculated by the measuring instrument)
Dimensions
(in mm)
Weight 170 g (with 1.5 m cable)
Materials Working electrode Gold
Counter electrode Lead
–Shaft
– Connection head
– Screwed cable gland
– Membrane head
POM
Membrane FEP, 13 μm
Sensor head Epoxy, PEEK
Thermistor housing VA steel 1.4571
Seals FPM (Viton)
Connection cable Lengths 1.5 ... 20 m
Diameter 6 mm
Smallest allowed
bend radius
Permanent bend: 80 mm
Single time or short time bend: 50 mm
Plug type Socket, 8 pins
Pressure
resistance
Sensor IP 68 (6 bar)
Sensor cable IP 68 (2 bar)
Plug IP 67 (when plugged in)
The 9009/6. meets the requirements according to article 3(3) of the
97/23/EC directive ("Pressure equipment directive").

9009/6.(-ID) Technical data
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Pin assignment
Measurement
conditions
Measuring ranges at 20 °C 0 ... 50 mg/l O2
0 ... 600 % O2saturation
0 ... 1250 mbar O2partial pressure
Temperature range 0 ... 50 °C
Max. allowed overpressure 6·105Pa (6 bar)
Depth of immersion min. 6 cm
max. 20 m (depending on the cable length)
Operating position any
Approach flow > 3 cm/s at 10 % measurement accuracy
10 cm/s at 5 % measurement accuracy
18 cm/s at 1 % measurement accuracy
Characteristic data
on delivery
Zero signal < 0.1 % of the saturation value
Response time at 20 °C t90 (90 % of the final value display) < 10 s
t95 (95 % of the final value display) < 16 s
t99 (99 % of the final value display) < 60 s
Oxygen own consumption
at 20 °C
0.008 μg·h-1 (mg/l)-1
Drift approx. 3 % per month in the operating con-
dition
Working life min. 6 months with one electrolyte fill

Wear parts and accessories 9009/6.(-ID)
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8 Wear parts and accessories
Note
For further accessories, refer to the SI Analytics catalog or the Internet.
Wear parts and
maintenance
accessories
Description Model
Set of exchange membrane caps (3 pieces) OX 923
Electrolyte solution OX 920
Cleaning solution for lead counter electrode OX 921
Polishing film SF 300
Accessory kit, comprising:
– 3 exchange membrane caps
– Polishing film SF 300
– Electrolyte solution OX 920
– Cleaning solution OX 921
OX 925

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Hattenbergstr. 10
D-55122 Mainz
Email: support@
Telefon [phone]
Telefax +49 (0) 61 31/66 5001
si-analytics.com
Internet: www.si-analytics.com