Oxi 3205
3
20
5
O
2
7.92
[S
a
l]
25.0
mg/l
°C
Operating manual
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Dissolved oxygen (D.O.) meter
Oxi 3205
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 manual and your meter. 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.
Copyright
© Weilheim 2009, WTW GmbH
Reproduction in whole - or even in part - is prohibited without the express
written permission of WTW GmbH, Weilheim.
Printed in Germany.
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Oxi 3205 Contents
Oxi 3205 - Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Socket field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 10
3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Scope of delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Switching on the meter . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 General operating principles . . . . . . . . . . . . . . . . . . . . . . 16
4.2.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.2 Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2.3 Example on navigation: Setting the language . . 19
4.3 Sensor-independent settings . . . . . . . . . . . . . . . . . . . . . 21
4.3.1 Setting in the Configuration menu . . . . . . . . . . . 21
4.3.2 Automatic Stability control . . . . . . . . . . . . . . . . . 21
4.4 Dissolved oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 22
4.4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.4.3 Settings for D.O. sensors
(menu or measurement and calibration settings)
24
4.4.4 D.O. calibration . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4.5 Displaying calibration records . . . . . . . . . . . . . . 27
4.5 Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.5.1 Resetting the measurement settings. . . . . . . . . 28
4.5.2 Resetting the system settings . . . . . . . . . . . . . . 29
5 Maintenance, cleaning, disposal. . . . . . . . . . . . . . . . . 31
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.1.1 Replacing the batteries . . . . . . . . . . . . . . . . . . . 31
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.3 Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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3
Contents Oxi 3205
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.2 Measuring ranges, resolution, accuracy . . . . . . . . . . . . . 36
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4
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Oxi 3205 Overview
1
2
3
3
205
O
2
7.92
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a
l]
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mg/l
°C
1Overview
The Oxi 3205 compact precision dissolved oxygen (D.O.) meter
enables you to perform D.O. measurements quickly and reliably.
The Oxi 3205 provides the maximum degree of operating comfort,
reliability and measuring certainty for all applications.
The proven OxiCal calibration procedure supports you in your work
with the D.O. meter.
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1 Keypad
2 Display
3 Socket field
5
Overview Oxi 3205
Oxi 3205
ENTER
1.1 Keypad
In this operating manual, keys are indicated by brackets <..> .
The key symbol (e.g. <ENTER>) generally indicates a short keystroke
(under 2 sec) in this operating manual. A long keystroke (approx.
2 sec) is indicated by the underscore behind the key symbol (e.g.
<ENTER
<On/Off>: Switches the meter on or off
<M>: Selects the measured parameter
<CAL>:
<CAL
_>:
<▲>: Increments values, scrolls
<▼>: Decrements values, scrolls
<ENTER>:
<ENTER
_>:
_>).
Calls up the calibration procedure
Displays the calibration data
Opens the menu for measurement settings / confirms
entries
Opens the menu for system settings
6
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Oxi 3205 Overview
25.0
7.92
°C
3
2
4
5
6
1
O
2
mg/l
[Sal]
1.2 Display
1 Status information
2 Measured value (with unit)
Function display
indicators
3 Measured parameter
4 Sensor symbol (calibration evaluation, calibration
interval)
5 Measured temperature (with unit)
6 Status line
Error An error occurred during calibration
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7
Overview Oxi 3205
2
1
1.3 Socket field
Connectors:
1 D.O. sensor
2 Service interface
Caution
Only connect D.O. sensors to the meter that cannot return any
voltages or currents that are not allowed (> SELV and > current
circuit with current limiting).
Almost all customary D.O. sensors fulfill these conditions.
8
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Oxi 3205 Safety
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the meter.
Consequently, all responsible personnel must read this operating
manual before working with the meter.
The operating manual must always be available within the
vicinity of the meter.
Target group The meter was developed for work in the field and in the laboratory.
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 Safety instructions in this operating manual are indicated by the
warning symbol (triangle) in the left column. The signal word (e.g.
"Caution") indicates the level of danger:
Further notes
Warning
indicates instructions that must be followed precisely in order to
avoid possibly great dangers to personnel.
Caution
indicates instructions that must be followed precisely in order to
avoid the possibility of slight injuries or damage to the meter or
the environment.
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating
manuals.
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Safety Oxi 3205
2.1 Authorized use
The authorized use of the meter consists exclusively of the
measurement of dissolved oxygen and temperature of liquid media in
a field and laboratory environment.
The technical specifications as given in chapter 7 T
ECHNICAL DATA must
be observed. Only the operation and running of the meter according to
the instructions given in this operating manual is authorized.
Any other use is considered unauthorized.
2.2 General safety instructions
This meter is constructed and tested in compliance with the IEC 1010
safety regulations for electronic measuring instruments.
It left the factory in a safe and secure technical condition.
Function and
operational safety
The smooth functioning and operational safety of the meter 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 meter can only be
guaranteed under the environmental conditions that are specified in
chapter 7 T
ECHNICAL DATA.
If the meter was transported from a cold environment to a warm
environment, the formation of condensate can lead to the faulty
functioning of the meter. In this event, wait until the temperature of the
meter reaches room temperature before putting the meter back into
operation.
Caution
The meter is only allowed to be opened by authorized personnel.
10
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Oxi 3205 Safety
Safe operation If safe operation is no longer possible, the meter must be taken out of
service and secured against inadvertent operation!
Safe operation is no longer possible if the meter:
z has been damaged in transport
z has been stored under adverse conditions for a lengthy period of
time
z is visibly damaged
z no longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the meter.
Obligations of the
purchaser
The purchaser of this meter must ensure that the following laws and
guidelines are observed when using dangerous substances:
z EEC directives for protective labor legislation
z National protective labor legislation
z Safety regulations
z Safety datasheets of the chemical manufacturers.
Caution
In addition to the safety instructions mentioned here, also follow
the safety instructions of the sensors used.
The operating manuals of the sensors are available on the
supplied CD and on the Internet under www.WTW.com.
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11
Safety Oxi 3205
12
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Oxi 3205 Commissioning
2
1
3 Commissioning
3.1 Scope of delivery
z D.O. meter Oxi 3205
z 4 batteries 1.5 V Mignon type AA
z Short instructions
z CD-ROM with detailed operating manual
3.2 Initial commissioning
Inserting the batteries
1 Unscrew the two screws (1) on the underside of the meter.
2 Open the battery compartment (2) on the underside of the
meter.
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3 Place four batteries (type Mignon AA) in the battery
compartment.
Note
Alternatively, you can also use Ni-MH rechargeable batteries (type
Mignon AA). In order to charge the batteries, an external charging
device is required.
Caution
Make sure that the poles of the batteries are positioned correctly.
The
± signs on the batteries must correspond to the ± signs in the
battery compartment.
13
Commissioning Oxi 3205
4 Close the battery compartment (2) and tighten the screws (1).
Switching on the meter
1 Press the <On/Off> key.
The meter performs a self-test.
The display shows the manufacturer's logo while the self-test
is being performed.
Subsequently, the meter switches to the measuring mode
(measured value display).
Note
The meter has an energy saving feature to avoid unnecessary battery
depletion.
The energy saving feature switches off the measuring instrument if no
key is pressed during the adjusted interval. (How to set the switch-off
interval, see section 4.3).
14
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Oxi 3205 Operation
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08:00
Menu
4 Operation
4.1 Switching on the meter
Switching on Press the <On/Off> key.
The meter performs a self-test.
The display shows the manufacturer's logo while the self-test is being
performed.
The measured value display appears.
Switching off Press the <On/Off> key.
Automatic switch-off
function
Display illumination The meter automatically switches off the display illumination if no key
The instrument has an automatic switch-off function in order to save the
batteries (see section 4.3). The automatic switch-off function switches
off the measuring instrument if no key is pressed for an adjustable
period.
is pressed for 30 seconds. The illumination is switched on with the next
keystroke again.
You can also generally switch the display illumination on or off (see
section 4.3).
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15
Operation Oxi 3205
4.2 General operating principles
This section contains basic information on the operation of the
Oxi 3205.
Operating elements,
display
Operating modes,
navigation
An overview of the operating elements and the display is given in
section 1.1 and section 1.2.
An overview of the operating modes and navigation of the Oxi 3205 is
given in section 4.2.1 and section 4.2.2.
4.2.1 Operating modes
The meter has the following operating modes:
z Measuring
The measurement data of the connected sensor is shown in the
measured value display
z Calibration
The course of a calibration with calibration information, functions
and settings is displayed
z Setting
The system menu or a sensor menu with submenus, settings and
functions is displayed
16
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Oxi 3205 Operation
Language: English
Illumination: On
Contrast
: 48 %
Switchoff time: 30 min
Service information
Reset
Configuration
Calibration record
Calibration interval
: 14 d
Temperature unit °C
Sal correction Off
Reset
i
Air pressure = 941 mbar
O
2
4.2.2 Navigation
Measured value display In the measured value display, you can
z Open the menu for calibration and measurement settings with
<ENTER> (short
keystroke)
z Open the Configuration menu with the sensor-independent settings
with <ENTER
_> (long keystroke (approx. 2 s).
z Change the display in the measurement window by pressing <M>
(e.g. D.O. concentration −> D.O. saturation index −> D.O. partial
pressure −>).
Menus and dialogs The menus for settings and dialogs in procedures contain further
submenus. The selection is made with the <▲><▼> keys. The current
selection is displayed with a frame.
z Settings
Settings are indicated by a colon. The current setting is displayed on
the right-hand side. The setting mode is opened with <ENTER>.
Subsequently, the setting can be changed with <▲><▼> and
<ENTER>. Example:
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z Functions
Functions are designated by the name of the function. They are
immediately carried out by confirming with <ENTER>.
Example: Display the Calibration record function.
17
Operation Oxi 3205
Calibration record
Calibration interval
: 14 d
Temperature unit °C
Sal correction Off
Reset
i
Air pressure = 941 mbar
O
2
Messages Information is marked by the i symbol. It cannot be selected. Example:
Note
The principles of navigation are explained in the section "Setting the
language" by reference of an example (see section 4.2.3).
18
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Oxi 3205 Operation
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Language: English
Beep: Off
Illumination
: On
Contrast: 48 %
Switchoff time: 30 min
Service information
Reset
Configuration
4.2.3 Example on navigation: Setting the language
1 Press the <On/Off> key.
The measured value display appears.
The instrument is in the measuring mode.
2 Using <ENTER_> open the Configuration menu.
The instrument is in the setting mode.
3 Select the Language submenu with <▲><▼>.
The current selection is displayed with a frame.
4 Open the setting mode for the Language with <ENTER>.
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19
Operation Oxi 3205
Language: Deutsch
Illumination: On
Contrast
: 48 %
Switchoff time: 30 min
Service information
Reset
Configuration
5 Select the required language with <▲><▼>.
6 Confirm the setting with <ENTER>.
The meter switches to the measuring mode.
The selected language is active.
20
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Oxi 3205 Operation
4.3 Sensor-independent settings
4.3.1 Setting in the Configuration menu
To open the Configuration menu, press the <ENTER
measured value display. After completing the settings, switch to the
measured value display with <M>.
Menu item Setting Description
Language Deutsch
English
(further)
Illumination Auto
On
Off
Contrast 0 ... 100 % Changing the display
Switchoff time 10 min ... 24 h Adjust the switch-off time
Service information Hardware version and
Reset - Resets the system settings
Select the menu language
Switching the display
illumination on/off
contrast
software version of the
meter are displayed.
to the default values.
For details, see section
4.5.2
_> key in the
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4.3.2 Automatic Stability control
The function, automatic Stability control (AutoRead) continually checks
the stability of the measurement signal. The stability has a considerable
impact on the reproducibility of measured values.
The measured parameter flashes on the display
z as soon as the measured value is outside the stability range
z if you switch over between the measured parameters with <M>.
21
Operation Oxi 3205
4.4 Dissolved oxygen
4.4.1 General information
You can measure the following parameters:
z D.O. concentration
z D.O. saturation index ("D.O. saturation")
z D.O. partial pressure
D.O. measurements with the Oxi 3205 can be carried out with the
CellOx 325 or DurOx 325 D.O. sensor.
The measuring instrument automatically recognizes the type of the
connected D.O. sensor.
Temperature
measurement
The CellOx 325 and DurOx 325 D.O. sensors have an integrated
temperature sensor.
Preparatory activities Perform the following preparatory activities when you want to measure:
1 Connect the D.O. sensor to the meter.
The D.O. measuring window is displayed.
2 Calibrate or check the meter with the sensor.
Note
Incorrect calibration of D.O. sensors will result in incorrect measured
values. Calibrate at regular intervals.
22
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Oxi 3205 Operation
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4.4.2 Measuring
You can carry out D.O. measurements as follows:
1 Perform the preparatory activities according to section 4.4.1.
2 Immerse the D.O. sensor in the test sample.
Selecting the
displayed
measured parameter
Salinity correction When measuring the concentration of see water, a salinity correction is
Stability control
(AutoRead )
Criteria for a stable
measured value
You can switch between the following displays with <M>:
z D.O. concentration [mg/l]
z D.O. saturation [%]
z D.O. partial pressure [mbar].
required. When the salinity correction is switched on, the [Sal] indicator
is displayed in the measuring window.
You can switch the salinity correction on or off and enter the salinity in
the menu for calibration and measurement settings (see section 4.4.3).
The stability control function (AutoRead) continually checks the stability
of the measurement signal. The stability has a considerable impact on
the reproducibility of measured values. The display of the measured
parameter flashes until a stable measured value is available.
The Stability control function checks whether the measured values are
stable within the monitored time interval.
Measured parameter Time interval Stability in the time interval
D.O. concentration 10 seconds
Δ : better than 0.05 mg/l
D.O. saturation 10 seconds
D.O. partial pressure 10 seconds
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The minimum duration until a measured value is assessed as stable is
the monitored time interval. The actual duration is mostly longer.
Δ : better than 0.6 %
Δ : Better than 1.2 mbar
23
Operation Oxi 3205
4.4.3 Settings for D.O. sensors (menu or measurement and calibration settings)
The settings are available in the menu for measurement and calibration
settings. To open the settings, display the required parameter in the
measured value display and press the <ENTER> or <ENTER> key.
After completing the settings, switch to the measured value display with
<M>.
Menu item Possible
Description
setting
Calibration record - Displays the calibration
record of the last calibration.
Calibration interval 1 ... 999 d Calibration interval for the
D.O. sensor (in days).
The meter reminds you to
calibrate regularly by the
flashing sensor symbol in
the measuring window.
Temperature unit °C
°F
Temperature unit,
degrees Celsius or degrees
Fahrenheit.
All temperatures are
displayed with the selected
unit.
Sal correction On
Off
Manual salt content
correction for concentration
measurements.
Reset - Resets all sensor settings to
the delivery condition (see
section 4.5.1).
24
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Oxi 3205 Operation
4.4.4 D.O. calibration
Why calibrate? D.O. sensors age. This changes the slope of the D.O. sensor.
Calibration determines the current slope of the sensor and stores this
value in the instrument.
When to calibrate? z After connecting another D.O. sensor
z When the sensor symbol flashes (after the calibration interval has
expired).
Calibration datasets The Oxi 3205 administrates two sets of calibration data:
z Set 1 for the type, "CellOx": – CellOx 325
z Set 2 for the type, "DurOx": – DurOx 325
Sensors of different types can be calibrated separately from each other.
When one sensor type is calibrated, the calibration data of the other
type remains stored. The Oxi 3205 recognizes the type of the
connected sensor and automatically uses the correct calibration data.
Calibration procedure Calibration in water vapor-saturated air.
®
air calibration vessel for calibration.
Stability control
(AutoRead)
Use an OxiCal
In calibration, the Stability control function (AutoRead) is automatically
activated.
Display calibration data You can have the data of the last calibration displayed (see section
4.4.5).
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25
Operation Oxi 3205
Calibration evaluation After the calibration, the measuring instrument automatically evaluates
the current status of the calibration. The evaluation appears on the
display and in the calibration record.
Display Calibration record Relative slope
+++ S = 0.8 ... 1.25
++ S = 0.7 ... 0.8
+ S = 0.6 ... 0.7
Calibration in
water vapor
saturated air
(air calibration vessel)
Error Error
S < 0.6 or S > 1.25
Eliminate the error according to
chapter 6 W
HAT TO DO IF...
Proceed as follows to calibrate the instrument:
1 Connect the D.O. sensor to the meter.
2 Put the D.O. sensor into the air calibration vessel.
Note
The sponge in the air calibration vessel must be moist (not wet). Leave
the sensor in the air calibration vessel for a time long enough to adjust.
3 Start the calibration with <CAL>.
The last calibration data (relative slope) is displayed.
26
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Oxi 3205 Operation
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2
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25.1
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OxiCal
4 Start the measurement with <ENTER>.
The measured value is checked for stability (stability control).
The [AR] status indicator is displayed. The measured
parameter flashes.
5 Wait for the end of the AutoRead measurement or accept the
calibration value with <ENTER>.
The calibration record is displayed.
Displaying the
calibration record
6 Using <ENTER>, switch to the measured value display.
4.4.5 Displaying calibration records
The calibration record of the last calibration is to be found under the
menu item, Calibration record. To open it in the measured value
display, press the <CAL
_> key.
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Operation Oxi 3205
4.5 Reset
You can reset (initialize) all sensor settings and sensor-independent
settings separately from each other.
4.5.1 Resetting the measurement settings
Note
The calibration data are reset to the default settings together with the
measuring parameters. Recalibrate after performing a reset.
The following settings for D.O. measurements are reset to the default
settings with the Reset function:
Setting Default settings
Cal. interval 14 d
Comparison meas. Off
Measured parameter D.O. concentration
Relative slope (S
)1.00
Rel
Salinity (function) Off
Temperature unit °C
The sensor settings are reset under theReset menu item in the menu
for calibration and measurement settings. To open the settings, display
the required parameter in the measured value display and press the
<ENTER> key.
28
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Oxi 3205 Operation
4.5.2 Resetting the system settings
The following system settings can be reset to the delivery status:
Setting Default settings
Language English
Contrast 50 %
Illumination Auto
Switchoff time 1 h
The system settings are reset in the menu, Configuration / System /
Reset. To open the Configuration menu, press the <ENTER
the measured value display.
_> key in
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29
Operation Oxi 3205
30
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Oxi 3205 Maintenance, cleaning, disposal
2
1
5 Maintenance, cleaning, disposal
5.1 Maintenance
The only maintenance activity required is replacing the batteries.
Note
See the relevant operating manuals of the D.O. sensors for instructions
on maintenance.
5.1.1 Replacing the batteries
1 Unscrew the two screws (1) on the underside of the meter.
2 Open the battery compartment (2) on the underside of the
meter.
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3 Remove the four batteries from the battery compartment.
4 Place four new batteries (type Mignon AA) in the battery
compartment.
Note
Alternatively, you can also use Ni-MH rechargeable batteries (type
Mignon AA). In order to charge the batteries, an external charging
device is required.
Caution
Make sure that the poles of the batteries are positioned correctly.
The
± signs on the batteries must correspond to the ± signs in the
battery compartment.
31
Maintenance, cleaning, disposal Oxi 3205
5 Close the battery compartment (2) and tighten the screws (1).
5.2 Cleaning
Occasionally wipe the outside of the measuring instrument with a
damp, lint-free cloth. Disinfect the housing with isopropanol as
required.
Caution
The housing is made of synthetic material (ABS). Thus, avoid
contact with acetone or similar detergents that contain solvents.
Remove any splashes immediately.
5.3 Packing
This meter is sent out in a protective transport packing.
We recommend: Keep the packing material. The original packing
protects the meter against damage during transport.
5.4 Disposal
Note
This meter contains batteries. Batteries that have been removed must
only be disposed of at a recycling facility set up for this purpose or via
the retail outlet.
It is illegal to dispose of it in household refuse.
32
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Oxi 3205 What to do if...
6 What to do if...
Error message,
OFL
Error message,
Error
Sensor symbol flashes
Display
Cause Remedy
– Measured value outside the
measuring range
Cause Remedy
– D.O. sensor contaminated – Clean D.O. sensor and
Cause Remedy
– Cleaning interval expired – Recalibrate the measuring
Cause Remedy
– Batteries almost empty – Replace the batteries (see
– Use a suitable D.O. sensor
replace it if necessary
system
section 5.1 M
AINTENANCE)
Meter does not react to
keystroke
You want to know which
software
version is in the meter
Cause Remedy
– Operating condition undefined
or EMC load unallowed
Cause Remedy
– E. g., a question by the service
department
– Processor reset:
Press the <ENTER> and
<On/Off> key
simultaneously
– Switch on the meter.
With <ENTER
<▲><▼> open the menu
Service Information. The
instrument data is displayed.
_> and
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What to do if... Oxi 3205
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Oxi 3205 Technical data
7 Technical data
7.1 General data
Dimensions approx. 180 x 80 x 55 mm
Weight approx. 0.4 kg
Mechanical structure Type of protection IP 67
Electrical safety Protective class III
Test certificates CE
Ambient
conditions
Power
supply
Guidelines
and norms used
Storage - 25 °C ... + 65 °C
Operation -10 °C ... + 55 °C
Climatic class 2
Batteries 4 x 1.5 V alkali-manganese batteries, type
AA
Rechargeable
batteries
Operational life up to 800 h without / 100 h with illumination
EMC EC directive 2004/108/EC
Meter safety EC directive 2006/95/EC
Climatic class VDI/VDE 3540
IP protection class EN 60529
4 x 1,2 V NiMH rechargeable batteries,
type AA (no charging function)
EN 61326-1
EN 61000-3-2
EN 61000-3-3
FCC Class A
EN 61010-1
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Technical data Oxi 3205
7.2 Measuring ranges, resolution, accuracy
Measuring ranges,
resolution
The values quoted in brackets apply especially for the
Note:
DurOx 325 sensor.
Parameter Measuring range Resolution
D.O. concentration
[mg/l]
0 ... 20.00 (0 ... 20.0)
0 ... 90.0 (0 ... 90)
Saturation [%] 0 ... 200.0 (0 ... 200)
0 ... 600
D.O. partial pressure
[mbar]
0 ... 200.0 (0 ... 200)
0 ... 1250
T [°C] 0 ... 50.0 0.1
Accuracy (± 1 digit) Parameter Accuracy
D.O. concentration
[mg/l]
± 0.5 % of measured value
at ambient temperature + 5 °C ... + 30 °C
Saturation [%] ± 0.5% of measured value
when measuring in the range of ± 10 K
around the calibration temperature
D.O. partial pressure
[mbar]
± 0.5 % of measured value
at ambient temperature + 5 °C ... + 30 °C
0.01 (0.1)
0.1 (1)
0.1 (1)
1
0.1 (1)
1
T [°C] / temperature sensor
NTC 30 ± 0,1
PT 1000 ± 0,1
Correction functions Temperature
compensation
Salinity correction 35 SAL
Air pressure
correction
Note
The accuracy values specified here apply exclusively to the meter. The
accuracy of the D.O. sensors has also to be taken into account.
Accuracy better than 2 % at 0 ... + 40 °C
Automatic through integrated pressure
sensor in the range of 500 ... 1100 mbar
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Oxi 3205 Technical data
FCC Class A Equipment Statement
Note: This equipment has been tested and found to comply with
the limits for a Class A digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is
operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual,
may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause
harmful interference in which case the user will be required to
correct the interference at his own expense.
Changes or modifications not expressly approved by the
manufacturer could void the user‘s authority to operate the
equipment.
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Technical data Oxi 3205
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Oxi 3205 Lists
8Lists
This chapter provides additional information and orientation aids.
Specialist terms The glossary briefly explains the meaning of the specialist terms.
However, terms that should already be familiar to the target group are
not described here.
Index The index will help you to find the topics that you are looking for.
Glossary
Adjusting To manipulate a measuring system so that the relevant value (e. g. the
displayed value) differs as little as possible from the correct value or
a value that is regarded as correct, or that the difference remains
within the tolerance.
AutoRange Name of the automatic selection of the measuring range.
Calibration Comparing the value from a measuring system (e. g. the displayed
value) to the correct value or a value that is regarded as correct.
Often, this expression is also used when the measuring system is
adjusted at the same time (see adjusting).
D.O. partial pressure Pressure caused by the oxygen in a gas mixture or liquid.
D.O. saturation Short name for the relative D.O. saturation.
Measured parameter The measured parameter is the physical dimension determined by
measuring, e. g. pH, conductivity or D.O. concentration.
Measured value The measured value is the special value of a measured parameter to
be determined. It is given as a combination of the numerical value and
unit (e. g. 3 m; 0.5 s; 5.2 A; 373.15 K).
OxiCal
®
WTW name for a procedure to calibrate D.O. measuring systems in
water vapor saturated air.
Reset Restoring the original condition of all settings of a measuring system.
Resolution Smallest difference between two measured values that can be
displayed by a meter.
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Lists Oxi 3205
Salinity The absolute salinity SA of seawater corresponds to the relationship
of the mass of dissolved salts to the mass of the solution (in g/Kg). In
practice, this dimension cannot be measured directly. Therefore, the
practical salinity according to IOT is used for oceanographic
monitoring. It is determined by measuring the electrical conductivity.
Salt content General designation for the quantity of salt dissolved in water.
Slope (relative) Designation used by WTW in the D.O. measuring technique. It
expresses the relation of the slope value to the value of a theoretical
reference sensor of the same construction type.
Stability control Function to control the measured value stability.
Test sample Designation of the test sample ready to be measured. Normally, a test
sample is made by processing the original sample. The test sample
and original sample are identical if the test sample was not processed.
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Oxi 3205 Lists
Index
A
Air calibration beaker . . . . . . . . . . . . . . . . . 25
Authorized use . . . . . . . . . . . . . . . . . . . . . . 10
Automatic switch-off . . . . . . . . . . . . . . . . . . 15
AutoRead . . . . . . . . . . . . . . . . . . . . . . . . . . 23
B
Battery compartment . . . . . . . . . . . . . . 13, 31
C
Calibration evaluation . . . . . . . . . . . . . . . . 26
D
Default settings
Measured parameter . . . . . . . . . . . . . . 28
System settings . . . . . . . . . . . . . . . . . . 29
E
Energy saving feature . . . . . . . . . . . . . . . . 14
I
Initial commissioning . . . . . . . . . . . . . . 13, 14
Initialize . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
S
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Sample display . . . . . . . . . . . . . . . . . . . . . . 7
Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Scope of delivery . . . . . . . . . . . . . . . . . . . . 13
Slope relative . . . . . . . . . . . . . . . . . . . . . . . 25
Socket field . . . . . . . . . . . . . . . . . . . . . . . . . 8
Stability control
Automatic . . . . . . . . . . . . . . . . . . . . . . . 21
T
Temperature measurement . . . . . . . . . . . . 22
K
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
M
Measured value display . . . . . . . . . . . . . . . 17
Measuring . . . . . . . . . . . . . . . . . . . . . . . . . 23
Menus (navigation) . . . . . . . . . . . . . . . . . . 17
Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 18
O
Operational safety . . . . . . . . . . . . . . . . . . . 10
P
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . 9
R
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
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Lists Oxi 3205
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Wissenschaftlich-Technische Werkstätten GmbH
Dr.-Karl-Slevogt-Straße 1
D-82362 Weilheim
Germany
Tel: +49 (0) 881 183-0
+49 (0) 881 183-100
Fax: +49 (0) 881 183-420
E-Mail: Info@WTW.com
Internet: http://www.WTW.com
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