Xylem OC100 User Manual
Operating Manual
System OxiTop® Control
OxiTop® OC100
Controller
OxiTop®-C
Measuring Heads
OC Model
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Safety Instructions
This instrument is built and checked according to IEC 1010, safety rules for
electronic measuring instruments and left the factory secure from a safety
engineering aspect.
The smooth functioning and operational safety of the equipment can only be
guaranteed by following the general safety precautions applicable and the special
safety instructions given in this operating manual.
– The trouble-free function and operational safety of the instrument can only be
guaranteed by following the climate conditions specified in the chapter
"Technical data" in this operating manual.
– If the system is transported from a cold environment to a warm environment, its
function can be impaired as a result of condensation forming. In this case, the
temperature of the equipment must be allowed to adapt to room temperature
before putting it into operation again.
– Adjustment of the equipment and maintenance or repair work must only be
performed by personnel authorized by WTW.
– If safe operation is no longer possible, the equipment must be taken out of
service and secured against inadvertent operation by labeling with warning
signs.
– The safety of the user can be affected by the instrument if, for example,
• the instrument is visibly damaged,
• the instrument no longer operates as prescribed,
• the instrument has been stored under adverse conditions for a lengthy
period of time,
• the instrument was exposed to adverse transport conditions.
– Basically, if you are in any doubt, please return the instrument for repair or
maintenance to the manufacturer of the equipment,
"Wissenschaftlich-Technische-Werkstätten GmbH".
Please read these safety instructions carefully before installing
the instrument!
Contents
Safety Instructions .................................................................................................... 3
Contents.....................................................................................................................4
Introduction ...............................................................................................................6
The measuring principle ........................................................................................7
The OxiTop
Operating modes ...................................................................................................8
Litterature.........................................................................................................8
Operating Elements ..................................................................................................9
Controller keybord .................................................................................................9
General Operating Principles.................................................................................10
Switching On ...........................................................................................................11
Switching on the controller...................................................................................11
Switching on the measuring heads .....................................................................11
Operating Mode: Routine BOD...............................................................................12
Sample preparation .............................................................................................12
Start the measurement ........................................................................................12
Call up all data ....................................................................................................15
Sample management...........................................................................................17
Show sample ......................................................................................................19
Erase data of finished samples ...........................................................................20
Show measuring head list....................................................................................21
Call up data .........................................................................................................22
Call up data - Stop ...............................................................................................24
Evaluation............................................................................................................25
Curve display of samples that are too cold ....................................................26
Measured values outside the measurement ranges ......................................26
Printing.................................................................................................................27
Operating Mode: Standard BOD ............................................................................29
Sample preparation .............................................................................................29
Start the measurement ........................................................................................29
Call up all data ....................................................................................................32
Sample management...........................................................................................35
Show sample ......................................................................................................36
Erase data of finished samples ...........................................................................37
Show measuring head list....................................................................................38
Call up data .........................................................................................................39
Call up data - Stop ...............................................................................................42
Evaluation............................................................................................................44
Sample statistics..................................................................................................45
Excluding a curve ................................................................................................46
Cursor interrogation .............................................................................................48
Curves display for cold samples ....................................................................49
Measured values outside the measuring range .............................................50
Print .....................................................................................................................51
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®
Control measuring system ...............................................................7
Contents
GLP/Tools ................................................................................................................53
GLP/Tools main menu .........................................................................................53
Show free measuring heads ................................................................................54
Show settings ......................................................................................................55
Settings................................................................................................................56
Operating mode .............................................................................................56
Measuring time...............................................................................................57
Date/Time.......................................................................................................57
GLP ................................................................................................................58
GLP - calibrating interval (”Calinterval”) ...................................................59
Memory ..........................................................................................................60
AutoTemp.......................................................................................................61
Switch-off interval...........................................................................................63
Language .......................................................................................................64
Check...................................................................................................................65
Show measuring heads..................................................................................65
Measuring head info.......................................................................................66
Controller info.................................................................................................67
Cal test ...........................................................................................................68
Pneumatic test measuring head.....................................................................71
Maintenance ........................................................................................................72
Erase finished samples..................................................................................72
Reset/release measuring head ......................................................................74
RS232 Interface .......................................................................................................76
Cleaning ...................................................................................................................77
Cleaning the sample bottles ................................................................................77
Cleaning the controller and measuring heads .....................................................77
Power Supply...........................................................................................................78
OxiTop®-OC100 controller ...................................................................................78
®
OxiTop
Disposing of the batteries ....................................................................................83
What to do if ...? ......................................................................................................84
Display messages................................................................................................84
Requirements / Problems ....................................................................................90
Accessories and Spare Parts.................................................................................95
Technical Data .........................................................................................................96
Note:
This operating manual refers to software release 1.xx.
The right to implement minor changes is reserved.
-C measuring head.................................................................................82
Introduction
The OxiTop® Control system provides a further development of the mercury-free,
measured value storing OxiTop
a multitude of new technological features that simplify the whole process of the BOD
determination for the user. Furthermore, the instrument is almost unlimited with
respect to its sample capacity and use. It can also be expanded flexibly to fulfill its
tasks. In addition to its application in the water economy, the OxiTop
”respirometric” measuring principle can also be used in other areas such as
• Evaluation of biological degradability, i.e. testing aerobic degradation
(e.g. test according to OECD 301F)
• Evaluation of respiration and toxicity in earth, sludge, waste and sediment (e.g.
extraction of earth contaminated according to recovery concepts)
• Evaluation of the respiration rate of cell cultures
• Microbiological growth and stress examinations
®
BOD measurement system. The instrument provides
®
Control with its
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Introduction
In addition, in conjunction with the enhanced OxiTop
accessories, the OxiTop
®
-C measuring heads can also be used to
®
Controller OC110 and relevant
• Measure anaerobic degradation processes (e.g. biogas evaluation)
The measuring principle
The sample bottles are filled according to the data visible in the display (BOD
measuring range with assigned water sample amount). The microorganisms draw
oxygen to degrade organic substances from the amount of air remaining in the closed
system. The carbon dioxide formed by this process is absorbed. Due to the reduction
in the amount of oxygen, the pressure in the bottle sinks. This change is detected and
stored by the measuring head. After the data transfer to the controller, it is used to
determine the BOD value.
Further information is given in the WTW BOD handbook.
The OxiTop® Control measuring system
The 6 or 12 position OxiTop
and consist of the OC100 OxiTop
inductive stirring system and various accessories.
The measured value determination and storage of the measurement data is
performed in the measuring head. This data is transmitted via ”infrared to the
controller” without the need for wires and then calculated to the BOD value. The user
can start his individual measuring program and printout the calculated data via the
TD100 IR printer or further process it via a PC program using the ”Routine BOD” and
”Standard BOD” operating modes described in detail in this operating manual. The
user interface appears in one of 5 selectable languages. An overview of the entire
sample management together with the status and function response is shown on the
display. With the aid of the display function, sample identification is no longer
required. Via the OxiTop
to 144 measuring positions.
An overview of the essential advantages
• DIN procedure • Modular extensions
• Mercury-free • Data storage
• Precise • Comfortable handling
• Automatic sample management
• Automatic measurement report
®
Control systems are configured for BOD determination
®
controller, the OxiTop®-C measuring heads, the
®
-C IS 6/12 expansion sets, the system can be extended up
• Wireless data transfer,
(even through glass or transparent
plastic)
General Operating Principles
Operating modes
The OC100 controller has 2 standard operating modes that differ from one another as
described below:
”Routine BOD”
This mode provides the user-friendly ”quick introduction”. The samples are managed
as single samples. The setting functions are logically restricted.
”Standard BOD”
The main difference to the ”Routine BOD” mode is in the parallel sample process for
up to 12 measuring heads per whole sample with mean value formation and statistical
evaluation. The setting is made via the function ”GLP/Tools”. The extended setting
functions allow a multitude of further options (see chapter ”GLP/Tools”). The samples
plotted in the ”Standard BOD” mode are not displayed in the ”Routine BOD” mode.
A table of the settings in the delivery state is given in the chapter ”GLP/Tools”.
Literature
Further information on this subject can be obtained at no cost from WTW:
- BOD handbook
- Application reports
- Special printouts
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Switching On
Controller keyboard
Sample management: List of samples, reading the data of individual
measuring heads or samples, displays of measuring
heads or samples
Printing of measurement data and settings
Switching on/off
GLP / Tools: Display free measuring heads, display or change settings,
perform checks or maintenance
Evaluation: Graphic and numerical display of measuring data
Communication with measuring heads: Start measuring, call up data
Select
Confirmation of entries
General Operating Principles
Representation of keys and displays:
Example: Pressing the ”Communication” button causes the mode to change to the
”Communication with the measuring heads” mode of operation:
Required
action: press
button.
The instrument displays:
Description of what the action
caused and possible further
request:
Starting communication with the
measuring heads.
Select a menu item using
.
Function keys:
These function keys are used to start or change a function.
Confirmed data and settings are preserved.
Display:
- In selection menus, the selected function or line appear in a lighter font on a
dark background
- :
Measuring head:
Each measuring head that receives a command from the controller, indicates this by
a short flashing signal.
Signal tone: This symbol means: A signal tone sounds.
Notes:
Instructions and additional information appear in italics.
Symbol for an OxiTop®-C measuring head
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Switching On
Switching on the controller
The current date and time appear
(important for the allocation of
sample numbers).
If the date/time is incorrect,
undertake corrections in
”GLP/Tools”.
The instrument is in the sample
management
(Routine mode,
in the delivery state).
Switching on the measuring heads
The measuring heads are immediately ready for operation. The controller switches
the measuring heads independently on and off during communication.
To avoid malfunctions:
In case of using two or more controllers please pay attention to the following:
Absolutely avoid starting measuring heads simultaneously
between controllers is less than 3 meters when doing this.
if the distance
Operating Mode: Routine BOD
Operating mode: Routine BOD
Sample preparation
See WTW application reports
(contained within the scope of delivery of the accessories supplied).
Screw the OxiTop
and tightly close them.
Important note:
Never use joint grease or other lubricant for your OxiTop
heads. Some of these products contain solvents that can cause severe damage
to the plastic housing.
The sealing of the BOD bottles is also perfectly adequate without grease.
However, you should always wipe off heavy contamination and particles on the
sealing surfaces of the rubber sleeves and OxiTop
liability for damage due to the use of joint grease.
Start the measurement
-C measuring heads onto the sample bottles
-C. WTW accepts no
Entry into the mode
“Communication with the
measuring heads“.
Preselected:
Start
Use
to select the measurement range.
The filling volume required is given
in the right-hand column.
The controller stores the setting
(memory function: the last selected
measurement range is set).
(measuring head).
-C measuring
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Operating Mode: Routine BOD
Confirm the selected
measurement range for the
sample. The automatically
allocated sample number is given
in the header line (YY/MM/DD and
sequential number).
Additional information:
Type of measurement, run time, measurement range, final date, Id
number.
“Temp“ display => the AutoTemp function (see the chapter “GLP/Tools”)
is set as a default in the routine mode.
Change the Id number of the additional identification of the sample
(e.g. extraction location) as follows:
- Use
- Press and
- Use
(setting range 001 ... 255).
- Use
to move the cursor to the Id number,
to set the Id number required
to confirm this.
Confirm the start of the
measurement. Contact selection:
The controller repeatedly sends the
start information in the scanner
mode until successful feedback is
received from the OxiTop®-C
measuring head.
Operating Mode: Routine BOD
Displays “Started“. From this point in
time, the sample exists within the
If no sample starts (e.g. because the controller was not held to - or not
held close enough to - a measuring head):
sample management. Subsequently,
the controller returns automatically to
the input menu.
The sample start was stopped.
Use
If an attempt is made to start an already started sample:
“Continue
controller to the measuring head
(see above).
Use “Stop start“ if you want to
return to the entry menu.
to confirm
start“ and hold the
In the delivery state, the controller automatically makes space when
“Start
erases the oldest finished sample (if a finished sample is available). You
can change this setting in “manual erase” (see the chapter “GLP/Tools Settings”).
” is selected if the measured value memory is full. To do this, it
Display shows “Measuring head
already used!”
Use
” and hold the controller to the
measuring head (see above).
Use “Stop start“ if you want to
return to the entry menu.
to confirm “New
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Operating Mode: Routine BOD
Call up all data
This function is used to call up the data of all measuring heads.
For the call up of the data of individual measuring heads: see the chapter on sample
management.
Entry menu “Communication with
the measuring heads“.
Point the controller at the measuring
heads:
Use
to select “Call up all data“.
40 cm to 100 cm
Queries the data of all active
measuring heads in the scanner
mode.
The controller stores the data
obtained and updates the list of
the sample management.
Duration of a pass: approx. 3
seconds for 12 measuring heads
in a stirring system.
Operating Mode: Routine BOD
If all the measuring heads do not respond in the 1st pass of the data query, the
controller searches for the missing measuring heads for approximately a further 7
seconds in the scanner mode. Without having to press another key, you can continue
the data queries at other locations (e.g. other stirring platforms or other thermal
cabinets). Approximately 7 seconds after the last call up was performed, the scanner
mode breaks off automatically and the following display appears:
Point the controller at the measuring
heads:
“Continue transfer“ (preselected):
A new pass is made only for
measuring heads that have not
yet responded.
Stop: The instrument returns to
the entry menu.
For information on searching for
missing measuring heads, see
the chapter “What to do if...“
40 cm to 100 cm
The call up of further measuring
heads takes place in the scanner
mode.
Message that the data of all
measuring heads has been
called up. The instrument
subsequently returns to the input
menu.
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Operating Mode: Routine BOD
Immediately after the data call up of the complete measurement data records of a
finished measuring head, this measuring head is set to the “free“ status. The
measuring head is now available for a new measurement. The sample allocated in
the sample management is “finished“ (see the chapter “Sample management”).
Sample management
Entry into the sample management.
A list of samples appears in the display (if samples are available):
BOD type and
run-duration
Sample number:
Date (YY/MM/DD)
and consecutive
number
Data of samples that have been started in the standard BOD operating mode, are not
listed in the routine BOD operating mode.
Reporting order:
- At the upper end of the list: finished samples (if available)
- Under this: running samples
Sorting of the samples: according to date and
sequential number 01 ... 99 from the oldest to the newest sample.
Temporal process of the sample:
Status bar partly filled:
The sample is not yet ready.
Status bar filled:
The ready and complete data set
of the sample can be called up from
the measuring head.
Status bar filled plus hook:
The sample is ready. The complete data
set is given in the controller for evaluation.
Operating Mode: Routine BOD
Select a sample.
Depending on the sample selected, one of the two following menus
appears. The header line contains the:
- sample number
- Id number (e.g. I001)
- BOD type and run time
of the selected sample.
Finished sample
Current sample
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Operating Mode: Routine BOD
Show sample
This function is used to find the measuring heads. A sample labeling is not necessary.
Starting point: sample
management .
Point the controller at the measuring
heads:
Use
to select a sample.
Use
to select “Show sample“.
40 cm to 100 cm
The controller transmits the call
up of the selected sample. The
allocated measuring head flashes
for approx. 5 seconds.
After the message, the controller automatically returns to the
previous menu.
Operating Mode: Routine BOD
Erase data of finished samples
This function erases the data of finished samples from the sample management of the
controller. You can only erase a sample if it is finished; in non-finished samples, the
menu item “Erase sample“ does not appear.
Starting point: sample
management .
Use
to select a finished sample.
Use
to select the “Erase sample“
submenu.
Safety query with possibility to
return.
The sample has been erased.
After the message, the controller automatically returns to the starting
menu, “Sample management“.
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Operating Mode: Routine BOD
Show measuring head list
This function is used to allocate a measuring head to the relevant sample.
Point the controller at the measuring
heads:
Use
to select “ list“.
“List“, i.e. a measuring head is
displayed together with the serial
number of the measuring head.
The controller transmits the call
up of the selected sample. The
allocated measuring head flashes
for approx. 5 seconds.
40 cm to 100 cm
Operating Mode: Routine BOD
Call up data
This function is used to call up the data of individual measuring heads. To call up the
data of all measuring heads, see the chapter “Call up all data“.
Use
to select a sample whose
- run time is not yet completed
(bar not yet full)
- data after complete
measurement that has not yet
been called up
(bar full, no tick)
Jumps to the submenu of the
selected sample.
Preselected: “Call up data“
Point the controller at the measuring
heads:
40 cm to 100 cm
Call up the measuring head
allocated to the sample in the
scanner mode:
The controller
- stores the data obtained
- updates the lists of the
sample management
The controller confirms the call
up performed.
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Operating Mode: Routine BOD
If the measuring head does not respond, the following display appears:
The controller then returns
automatically to the submenu.
The controller continues to search for the measuring head in the scanner mode.
Without pressing any further keys, the data call up can be continued at other
locations (e.g. other stirring platforms or other thermal cabinets). After approx. 7
seconds, the scanner mode automatically breaks off and the following display
appears:
Use to restart the
call up of the data (see above).
Return to the main menu,
“Sample management“.
Samples that were called up and
completed appear with a tick next
to them.
Call up data - Stop
Operating Mode: Routine BOD
If a measuring head is missing or
defective and the controller
cannot transfer the data as a
result, the menu item “Stop“ is
provided.
After confirmation, the display
message shown here appears.
Then:
“Show
“Missing
“:
“:
As in “Show sample“ but used selectively for missing measuring
heads (identification option if only the sender of the measuring head
is defective. Otherwise identify missing measuring heads using
“Show all“ (see the chapter “GLP/Tools”).
Using this you can remove the data of a missing or defective
measuring head from the sample management of the controller.
Erase:
Removes missing samples from
the data stock.
Return:
Jumps back to the previous
menu.
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Operating Mode: Routine BOD
Evaluation
Change to cursor prompt:
Starting point: sample
management.
Use
to select a sample.
Enters into the evaluation:
Display of the selected sample as
a curve together with measured
value data.
Pressing causes the
cursor (crosswire) to run through
the points of the curve. The
allocated run time and the
corresponding measured value
are each displayed.
Pressing
display of the curve together with the measured value data.
changes between the cursor prompt and
Operating Mode: Routine BOD
Curve display of samples that are too cold
Display of a curve
In using samples that are too cold, the maximum AutoTemp time is not sufficient to
reach the temperature adaption of the sample: By warming the sample, excess
pressure can result.
Display: Negative values of the curve are truncated and the curve emerges from
the time axis but not from the origin.
Measured values outside the measurement ranges
In the following cases, the evaluation displayed is not the measured value but “undef.“
(undefined):
- The measurement curve exceeds the measurement range at some point of its path.
- The measurement curve undercuts the measurement range at its end point.
Sample displays:
The measured value exceeds the
measurement range (overflow).
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Operating Mode: Routine BOD
The measured value undercuts
the measurement range
(underflow).
Printing
Point the controller at the printer:
Switch on the TD 100 IR printer.
The controller outputs the report data of the selected sample on the
IR interface.
Printout of:
- sample information
(start date and time, final date, type, measurement range,
identification number)
- curve + BOD final value
- report printouts: - current settings
- start information
-
- controller info
The measured value temporarily
leaves the measurement range.
10 cm to 100 cm
info
Operating Mode: Routine BOD
From the sample management: From the evaluation:
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Operating Mode: Standard BOD
Operating mode: Standard BOD
Sample preparation
See WTW application reports
(contained within the scope of delivery of the accessories supplied).
Screw the OxiTop
and close them tightly.
Important note:
Never use joint grease or other lubricant for your OxiTop
heads. Some of these products contain solvents that can cause severe damage
to the plastic housing.
The sealing of the BOD bottles is also perfectly adequate without grease.
However, you should always wipe off heavy contamination and particles on the
sealing surfaces of the rubber sleeves and OxiTop
liability for damage due to the use of joint grease.
Start the measurement
To change to the operating mode BOD Standard refer to chapter GLP/Tools Settings - Operating mode.
-C measuring heads onto the sample bottles
-C measuring
-C. WTW accepts no
“Communication with the
measuring heads” mode.
Preselected: “Start sample”.
Use
to select the measurement range.
The filling volume required is
given in the right hand column.
The controller stores the setting
(memory function: the last
selected measurement range is
set).
Operating Mode: Standard BOD
Additional information:
Type of measurement, run time, measurement range, final date, Id
number.
“Temp“ display => the AutoTemp function (see the chapter
“GLP/Tools”) is switched on.
Change the Id number for the additional identification of the sample
(e.g. extraction location) as follows:
- Use
- Press and
- Use
(setting range 001 ... 255).
- Use
to move the cursor to the Id number,
to set the Id number required
to confirm this.
Confirm the selected
measurement range for the
sample. The automatically
assigned sample number
(YY/MM/DD and sequential
number) is given in the header
line.
Use
possible (see the chapter “Standard BOD - Print”).
to print out the entire sample information
Confirm the start of
measurement.
Contact selection:
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