Xylem TM 40 User manual

2021-10-26
Operating Manual
TM40
pH/Redox/ISE Meter
LF40
Conductivity Meter
AM 40
Oxygen Meter

TABLE OF CONTENTS
1Safety..................................................................................................................................................... 4
2Sockets.................................................................................................................................................. 5
2.1 Battery...........................................................................................................................................5
3Button, Display, Menu structure, Password protection ................................................................... 6
3.1 Operation elements.......................................................................................................................6
3.2 Menu structure...............................................................................................................................7
3.3 Password protection......................................................................................................................7
4Configuration the basic settings „General” ...................................................................................... 8
4.1 Configuration Backlight .................................................................................................................8
4.2 Configuration pass word................................................................................................................8
4.3 Configuration clock........................................................................................................................8
4.4 Configuration language.................................................................................................................9
4.5 Configuration off time....................................................................................................................9
4.6 Data logger....................................................................................................................................9
5Info ....................................................................................................................................................... 10
6Interface HMG USB............................................................................................................................. 10
7TM 40.................................................................................................................................................... 11
7.1 Application Fields TM 40.............................................................................................................11
7.2 Composition TM 40.....................................................................................................................11
7.3 Configuration TM 40....................................................................................................................11
7.3.1 Configuration of the fix temperature...............................................................................11
7.3.2 Configuration of the sensor type.....................................................................................12
7.4 Calibration pH..............................................................................................................................12
7.4.1 Data input .......................................................................................................................12
7.4.2 Settings of the temperature offset ..................................................................................13
7.4.3 Two-point-Calibration „Two point“ ..................................................................................13
7.4.4 Automatic Calibration .....................................................................................................13
7.4.5 Calibration error..............................................................................................................14
7.5 Calibration Redox........................................................................................................................14
7.5.1 Data input .......................................................................................................................14
7.5.2 Setting of the temperature offset....................................................................................14
7.6 Calibration ISE.............................................................................................................................14
7.6.1 Data input .......................................................................................................................15
7.6.2 Settings of the temperature offset ..................................................................................15
7.6.3 Two-point Calibration „Two point“...................................................................................15
8AM 40 ................................................................................................................................................... 15
8.1 Application Fields AM 40.............................................................................................................15
8.2 Composition AM 40.....................................................................................................................16
8.3 Configuration AM 40....................................................................................................................16
8.3.1 Configuration of the fix temperature...............................................................................16
8.3.2 Configuration of the main value......................................................................................16
8.4 Calibration oxygen.......................................................................................................................17
8.4.1 Data input .......................................................................................................................17
8.4.2 Settings of the Temperature Offset ................................................................................17
8.4.3 Single-Point Calibration „One point“...............................................................................18
8.4.4 Automatic Calibration .....................................................................................................18
8.4.5 Calibration error..............................................................................................................18
9LF 40 .................................................................................................................................................... 18
9.1 Application Fields LF 40..............................................................................................................18
9.2 Construction LF 40......................................................................................................................18
9.3 Configuration LF 40.....................................................................................................................19
9.3.1 Configuration of the fix temperature...............................................................................19

9.3.2 Configuration of the measuring range „meas. range“ ....................................................19
9.4 Calibration conductivity ...............................................................................................................20
9.4.1 Data input .......................................................................................................................20
9.4.2 Settings of the temperature offset ..................................................................................21
9.4.3 One-point-Calibration „One point“ ..................................................................................21
9.4.4 Automatic calibration „Automatic“...................................................................................21
9.4.5 Calibration error..............................................................................................................22
10 Specifications ..................................................................................................................................... 22
11 Delivery volume.................................................................................................................................. 23
12 Accessories......................................................................................................................................... 23
13 Maintenance........................................................................................................................................ 23
14 Service and Returns........................................................................................................................... 24

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1 Safety
This Operating Instructions Manual contains fundamental information that should be observed in
connection with the installation, start-up, operation and maintenance of the instrument in connection
with the sensor. Therefore, it is absolutely vital for the user to read this manual completly prior to
working with it.
The symbol „General Warning“indicates special warnings in the manual.
User qualification
The device has been designed for analytical measurements. It is assumed that the user/operator and
the maintenance personnel have the proper professional skills and experience to know the specific
properties of analytical measuring systems, master the safe handling of chemicals, for example, in the
maintenance of electrodes/sensors, and can assess any dangers and risks resulting thereof. The user
must ensure that the national legislation and procedures concerning the maintenance of industrial
health and safety standards, the accident preventions and the handling of chemicals are observed.
Installation and getting started
The perfect functioning and operational safety of the instrument can only be maintained under the
climatic conditions specified in the chapter „Specifications“ of this manual. When the instrument is
moved from cold to warm surroundings, condensate may occur and interfere with the functioning of the
instrument. In such case, the user should wait until the temperature of the instrument has adapted to
the ambient temperature before using the instrument again.
Use the sensor and interface cables recommended by the manufacturer only. For the sensors and ac-
cessories, the instructions and regulations given in the respective operating instructions manuals and
specification sheets will apply. The instrument can only be operated with the battery specified in the 
chapter „Specifications”.
Be careful when connecting other instruments (e. g. via interface). Connections with external instru-
ments may cause not permissible potentials inside the instrument (e. g. connections between GND and
earth). These potentials may result in operational influences or malfunctions in the instrument itself or
the external devices connected.
Proper usage
The device and the sensor are intended for measuring and documentation of analysis parameters.
Taking into consideration the specifications, operating and using the unit for this application is the
proper usage. Any application beyond this and individual modifications or extensions are improper and
will lead to loss of entitlement to the warranty. When connecting the unit with electro-chemical sensors,
always take into account their life and natural wear as this may result in malfunctioning of the
measuring system and the regulation or control associated therewith. The user must take suitable
measures to limit harmful effects of such malfunctioning.
General safety instructions
The complete device has been manufactured and tested in accordance with the relevant guidelines and
standards for electronic measuring equipment. It has left the factory in technically unobjectionable
condition.
The perfect functioning and operational safety of the instrument and the accompanying components will
only be ensured if the user observes the normal safety precautions as well as the specific safety guide-
lines stated in the present manual and in the relevant operating instruction manuals of the components
contain replaceable components (exception of the battery) and must be opened for repair by proprietary
workshops only. If there is reason to assume that the instrument can no longer be employed without a
risk, it must be set aside and appropriately marked to prevent further use. The safety of the user may be
endangered, e. g. if the instrument or one of its components:
shows visible damage
no longer operates as specified
has been stored over a longer period under unsuitable conditions
has been subjected to difficult conditions during transport
If in doubt, please contact your supplier and sent back the instrument to the manufacturer for repair and mainte-
nance.

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2 Sockets
2 sockets for connecting the sensor and the”Interface HMG USB” are located on the front side of the instrument.
Please use only the delivered original cable for the interface with the PC. For protecting the sockets against mois-
ture and to avoid corrosion, the sensor should always be connected to the instrument and the „Interface HMG
USB” socket should be sealed by means of the protection cap if it is not in use. The „Interface HMG USB” is not
included in the delivery.
The measuring inputs must be potential-free and must have no connection to mains voltage potentials.
All inputs must be operated with the appropriate sensors only. Connect directly from foreign signals is
not allowed.
Cable Sockets
2.1 Battery
Please open the battery chamber on the back side of the instrument and insert the battery correctly into the
chamber.
Battery Chamber
Please use only leak proof alkaline manganese batteries from the type AA, IEC R6, LR6 only. After
connecting and inserting the battery, please close the battery chamber carefully and correctly, to avoid
moisture coming inside the device.
If the battery is in low condition, the device shows these with only 1 bar in battery indicator display. A
change of the battery is recommended. If there is no bar in the display, the battery must be changed
immediately.
Please note: The main printed board carries a lithium battery. Batteries should not to be disposed of
with the normal domestic waste. They will be taken back and recycled or disposed of properly by the
manufacturer at no cost.
Only for AM 40:
After changing battery or sensor please note the wait time before a new calibration. We recommend a
new calibration after battery change, because the permanent polarisation of the sensor was inter-
rupted by disconnecting the sensor from the battery.

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3 Button, Display, Menu structure, Password protection
3.1 Operation elements
The instrument features easy operation by means of 5 buttons only and a plain text menu structure.
Button
Open a menu
Information
Configuration
Data logger
Calibration
On / Off
navigation in the
menu
Cursor left
Cursor up
Cursor down
Cursor right
selection /
ENTER
input / change
values
Cursor left
position value
+1
position value -1
Cursor right
confirm / save
value
By pressing the button „ON/OFF“the meter switches on. The meter switches off either automatically
after a preset time-out or by long (approximately 3 seconds) pressing the „ON/OFF“button.
Only for AM 40:
Also when the AM 40 is switched off, the connected O2-Sensor is supplied with the necessary polari-
sation voltage and so the system is directly after switching on always ready to measure.
Display
nLF
Configuration
Navigation <up>
Calibration
Navigation <right>
Data logger
Navigation <down>
Graphic display
On / Off
Enter
Information
Navigation <left>
Battery bar display
Main measurement value
Second measurement value
Date / Time
Fix temperature active
Temperature
Min / Max main measurement
value
Temperature compensation
(only LF 40)

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3.2 Menu structure
Passwort
pass word
Konfigurieren
configuration
Temperatur
temperature
Sensortyp
sensortype
Allgemein
general
zurueck
back
Intervall
intervall
Automatik
automatic
Reset
reset
zurueck
back
Festtemp.
fixed temp.
Temp.-Wert
temp.-value
zurueck
back
pH
Redox
ISE
Display
display
Passwort
pass word
Uhr
clock
Reset
reset
Sprache
language
Deutsch
English
Auszeit
off time
Ansprechv.
response
schnell
fast
mittel
medium
langsam
slow
zurueck
back
Datenlogger
data logger
Ein
enable
Aus
disable
Backlight
backlight
Kontrast
contrast
zurueck
back
Hauptanzeige
main value
%
mg/l
M-Bereich
meas.range
200µS
2000µS
20mS
500mS
Auto
TDS
Resist
20µS0,1
2µS0,01
200µS0,1
AM40
TM40
LF40
3.3 Password protection
The calibration menu (CAL) and the configuration menu (CONF) are password-protected.
The default password for opening these menus is 1.

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4 Configuration the basic settings „General”
The entire structure of the menu is displayed graphically in chapter 3.2.
Under „General“, the following device-relevant basic settings can be configured:
Display
Password
Clock
Language
Off time
Back
4.1 Configuration Backlight
On the device the backlight for display can be switched on or off.
For configuration of the backlight do the following steps:
1. Open menu „general“
2. Select „Backlight“disable/enable
Select the position you would like to use by using the buttons or .
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .
4.2 Configuration pass word
For configuration of the password do the following steps:
1. Open menu „general“
2. Select „Pass word“and enter your new pass word
3. Retry the new pass word
Select the position you would like to change by using the buttons or and change with or .
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .
4.3 Configuration clock
For configuration of the clock do the following steps:
1. Open menu „general“
2. Select „clock“and enter the time and date
Select the position you would like to change by using the buttons or and change with or .
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .

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4.4 Configuration language
For configuration of the language do the following steps:
1. Open menu „general“
2. Select „language“and enter the language
Select the position you would like to use by using the buttons or
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .
4.5 Configuration off time
You can set the time when the meter switches off automatically. The data logger will continue to log, if it is set in
chapter „Data logger”.
To configuration the off time do the following steps:
1. Open menu „general“
2. Select „off time“and enter the time
Select the position you would like to change by using the buttons or and change with or .
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .
4.6 Data logger
The device has an integrated data logger with real-time clock. So it is possible to save the last about 4.000 data
sets (date, time, main measurement value, second measurement value, temperature).
The saved data can be either displayed directly in the device display or transferred by the USB-interface.
To configuration the data logger do the following steps:
1. Open menu „general“
2. Enter the time interval in the menu item „interval“
Select the position you would like to change by using the buttons or and change with or .
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .
Data logger Automatic:
If the automatic is switched off, the logger logs only by switched on device. (please note also the off time)
If the automatic is switched on, the logger logs continue. (long time logging)
For correct logger function set the real time clock.
During view the logged data’s the recording is stopped.

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Menu structure data logger
5 Info
Menu structure Info
6 Interface HMG USB
For comfortable reading out of the data logger and configuration the device, a download of the software
„DinModule” from http://download.meinsberg.de/en/ is possible. To connected the pocked meter with a PC the as
accessory available „Interface HMG USB“is needed.
or
Next
Measurement
value Info
Next
periode
1 period
back
Back to the measurement value
Measurement
value Info
MIN/MAX INFO
RESET MIN/MAX
MESSMODUS
CAL INFORMATION

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7 TM 40
7.1 Application Fields TM 40
The pH/Redox/ISE Meter measures pH/Redox and ISE-potential and combines the features for mobile applica-
tion in the field with the precision and comfort of a laboratory meter with plaint text structure menu, integrated
data logging system and a rugged watertight IP 65 enclosure.
7.2 Composition TM 40
TM 40/Set comes completely with the accompanying pH-Sensor EGA142-K010-U-X and accessories in a protec-
tive case. This combination operates in accordance with the standardized requirements for determination of pH;
electrochemical probe method acc. EN ISO 10523:2012.
The instrument can be used in any situation where quickly and exactly pH/Redox/ISE-concentration and temper-
ature should be measured. High measuring accuracy, processor-steered measuring value processing, watertight
IP65 case and the versatility in connection with pH, Redox or ISE Sensors distinguish the TM 40.
The TM 40 has an automatic temperature compensation for the pH measurement as well as an adjustable refer-
ence temperature with measurements without temperature sensor. For calibration the automatic or manual cali-
bration routine can be used.
By connection of a Redox sensor the TM 40 displays the measured Redox potential (to the Ag/AgCl-relation elec-
trode) and the temperature-compensated calculation of the Redox potential referenced on the standard-hydrogen
electrode to DIN 38404.
All Meinsberg Electrodes are available with fixed cable and connector BK. Obviously special electrodes (pH com-
bination electrodes, redox combination electrodes or electrodes supplied from other manufacturers with BK plug)
can be used in connection with TM 40. The isopotential point (25 °C) of the used electrodes must be pH 7. Plati-
num combination electrodes with Ag/AgCl reference system with 3 mol/l KCl electrolyte are recommended for
redox potential measurements (e. g. EMC133-K010-U).
The description of the used electrode is listed in the separate instructions for use for the sensor.
7.3 Configuration TM 40
The entire structure of the menu is displayed graphically in chapter 3.2.
Open with + password the configuration menu.
Select the menu item you would like to configuration.
data logger
temperature
sensortype
general
back
7.3.1 Configuration of the fix temperature
For calculating the analysis parameter pH a temperature compensation is always necessary.
For that the temperature of the measuring and of the calibration fluid must be measured or a fix temperature must
be configured. If the fix temperature is activated this will be used for the temperature compensation. In this case
the message Fix appears in the right upper display corner.
For configuration the fix temperature do the following steps:
1. open the menu „temperature“
2. activate / deactivate the fix temperature in the menu item „fixed temp.“
3. enter the fix temperature value in the menu item „temp.-value“
Select the position you would like to change by using the buttons or . Adjust the corresponding posi-
tion with (+1) or (-1). Press the -button to accept and save the entry. To cancel the input dia-
logue without saving the value press + .

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7.3.2 Configuration of the sensor type
The TM 40 can be connected with pH, ORP or ISE electrodes. The used sensor type has to be configured in the
device.
For configuration of a sensor type do the following steps:
1. open menu „sensortype“
2. select the type
pH
Redox
ISE
Select the position you would like to use by using the buttons or . Press the -button to accept
and save the entry. To cancel the input dialogue without saving the value press + .
7.4 Calibration pH
Menu structure
Passwort
pass word
Kalibrieren
calibrate
Temp.Offs.
temp.offs.
Zweipunkt
two point
Automatik
automatic
Asymmetrie
asymmetrie
Steilheit
slope
Eingabe
input
zurueck
back CAL INFORMATION
zurck
back
Open with + password the calibration menu.
All kinds of calibration method will be displayed. Choose now your method.
Take note of temperature compensation for all calibration methods. This means, if measured values are compen-
sated by temperature measurement, the associated temperature sensor must also be dipped into the calibration
medium to be able to determine the exact temperature.
Carefully rinse electrode with distilled/deionized water after each measurement to avoid carrying off of the meas-
uring medium and sluggish measurement.
The sensor will be dipped in the buffer solution. Wait until the value is stabilised.
7.4.1 Data input
Data input stands for the input of the specific values of the connected sensor, for example as determined at the
laboratory before.
asymmetry
slope
back
Select the corresponding calibration value whose settings you want to change. An input dialogue will now enable
you to change the values within corresponding limits. If you exceed these you will get an error message to
prompt you to enter a value within the fixed limits.

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Select the position you would like to change by using the buttons or and change with or .
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .
7.4.2 Settings of the temperature offset
This menu item enables you to set a temperature value offset. For this purpose open the menu item „temp. offs.”.
Now, an input dialogue will be displayed which facilitates the setting. The offset can be positive or negative.
Select the position you would like to change by using the buttons or and change with or .
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .
7.4.3 Two-point-Calibration „Two point“
Calibrate the sensor at two separate points using two different defined calibration solutions or known set point
values. The calibration points are supposed to include the measuring range or the measured values to be ex-
pected, respectively. You can choose any sequence of the calibration solutions or set point values.
At first, you will be prompted to dip the sensor into the first calibration medium. After this step press to ac-
cept the dialogue. Now, the currently measured value will be displayed. After the measured value has attained a
stable state, press to accept the dialogue. You will now be prompted to enter the associated set point
value.
Select the position you would like to change by using the buttons or . Adjust the corresponding posi-
tion with (+1) or (-1). Press the -button to accept and save the entry. To cancel the input dia-
logue without saving the value press + . The next dialogue field will now prompt you to dip the sensor
into the second calibration medium. After you have accepted this, the currently measured value will, again, be
displayed. Press again to accept the stabilised measured value, before you will be prompted to enter the
associated set point value.
As a result, you will now be given the new calibration values that will be save in the device.
7.4.4 Automatic Calibration
The automatic calibration of the pH measurement is a two-point type and requires knowledge of what buffer solu-
tion group you want to use. The TM 40 offers the following buffer solution groups for calibration:
NBS standard buffer solution as per DIN 19266: pH value at 25 °C 1.68 / 4.01 / 6.86 / 9.18 / 12.45
Technical buffer solution as per DIN 19267: pH value at 25 °C 1.09 / 3.06 / 4.65 / 6.79 / 9.23
Knick/Mettler-Toledo/Ingold buffer solution: pH value at 25 °C 2.00 / 4.01 / 7.00 / 9.21
Laboratory buffer solution: pH value at 25 °C 2.00 / 4.01 / 6.98 / 8.95 / 11.88
You must take a choice in the first dialogue box of the used buffer solutions. For further conditions and tips,
please refer to the sensor specifications.
A subsequent dialogue will prompt you to dip the sensor into the first buffer solution. Press to confirm.
Now, the current measured value will be displayed. After the display shows a stabilised value, confirm this. Now,
the same procedure as for the first buffer solution will follow (dip sensor into buffer solution 2, wait for value stabi-
lisation) for the second one.

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As a result, you will now be given the new calibration values that will be save in the device.
7.4.5 Calibration error
In the TM 40 predefined ranges for the calibration values are stored. If the determined calibration value is out of
the range the message !Out of limit! appears in the calibration information CAL INFORMATION. The deter-
mined calibration value will be stored nevertheless, so that the measuring and controlling is secured. In this case
a new calibration or a replace of the sensor is necessary.
7.5 Calibration Redox
Menu structure
Passwort
pass word
Kalibrieren
calibrate
Temp.Offs.
temp.offs.
zurueck
back
Offset
offset
Eingabe
input
CAL INFORMATION
zurueck
back
7.5.1 Data input
This menu item enables you to set a Redox value offset. Please see also menu structureFehler! Verweisquelle
konnte nicht gefunden werden. Redox.
7.5.2 Setting of the temperature offset
This menu item enables you to set a temperature value offset.
Same procedure as pH temperature offset at chapter „Calibration pH”.
7.6 Calibration ISE
Menu structure
Passwort
pass word
Kalibrieren
calibrate
Temp.Offs.
temp.offs.
Zweipunkt
two point
zurueck
back
Steilheit
slope
Messwert1
meas.val.
zurueck
back
Eingabe
input
Eingabewert1
input.val.
CAL INFORMATION

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7.6.1 Data input
Data input stands for the input of the specific values of the connected sensor, for example as determined at the
laboratory before.
Select the corresponding calibration value whose settings you want to change by. An input dialogue will now ena-
ble you to change the values within corresponding limits. If you exceed these you will get an error message to
prompt you to enter a value within the fixed limits.
slope
meas.val.
input. Val.
back
Select the position you would like to change by using the buttons or and change with or .
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .
7.6.2 Settings of the temperature offset
This menu item enables you to set a temperature value offset.
Same procedure as temperature offset at chapter „Calibration pH”.
7.6.3 Two-point Calibration „Two point“
Calibrate the sensor at two separate points using two different defined calibration solutions or known set point
values. The calibration points are supposed to include the measuring range or the measured values to be ex-
pected, respectively. You can choose any sequence of the calibration solutions or set point values.
At first, you will be prompted to dip the sensor into the first calibration medium. After this step press to ac-
cept the dialogue. Now, the currently measured value will be displayed. After the measured value has attained a
stable state, press to accept the dialogue. You will now be prompted to enter the associated set point
value.
Select the position you would like to change by using the buttons or . Adjust the corresponding posi-
tion with (+1) or (-1). Press the -button to accept and save the entry. The next dialogue field
will now prompt you to dip the sensor into the second calibration medium. After you have accepted this, the cur-
rently measured value will, again, be displayed. Press again to accept the stabilised measured value, be-
fore you will be prompted to enter the associated set point value. As a result, you will now be given the new cali-
bration values that will be save in the device. To cancel the input dialogue without saving the value press +
.
8 AM 40
8.1 Application Fields AM 40
The Oxygen Meter measures dissolved oxygen in accordance with the German standard methods for the exami-
nation of water, waste water and sludge DIN EN ISO 5814:2013 and combines the features for mobile application
in the field with the precision and comfort of a laboratory meter. The meter is the ideal choice for determination of

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the oxygen content in surface water, sewage and for application in wastewater treatment. AM 40 features simul-
taneous measurement of oxygen and temperature, high measuring accuracy, multi function display, easy air cali-
bration, integrated data logging system and a rugged watertight IP 65 enclosure.
8.2 Composition AM 40
AM 40/Set comes completely with the accompanying dissolved oxygen sensor MF41N/AM40 and accessories in
a protective case. This combination operates in accordance with the standardized requirements for determination
of dissolved oxygen; electrochemical probe method acc. ISO 5814:1990 resp. German version DIN EN ISO
5814:2013. The instrument in connection with the sensor indicates the mass concentration of dissolved oxygen in
aqueous solutions in mg/l and the oxygen saturation index in percent saturation as well as the relevant tempera-
ture simultaneously.
The description of the used dissolved oxygen sensor is listed in the separate instructions for use for the sensor.
8.3 Configuration AM 40
The entire structure of the menu is displayed graphically in chapter 3.2.
Open with + password the configuration menu.
Select the menu item you would like to configuration.
data logger
temperature
main value
general
back
8.3.1 Configuration of the fix temperature
For calculating the analysis parameter O2a temperature compensation is always necessary. For that the temper-
ature of the measuring and of the calibration fluid must be measured or a fix temperature must be configured. If
the fix temperature is activated this will be used for the temperature compensation. In this case the message Fix
appears in the right upper display corner.
For configuration the fix temperature do the following steps:
1. open the menu „temperature“
2. activate / deactivate the fix temperature in the menu item „fixed temp.“
3. enter the fix temperature value in the menu item „temp.-value“
Select the position you would like to change by using the buttons or and change with or .
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .
8.3.2 Configuration of the main value
It is possible to replace the main measuring value and the second measuring. If not different ordered in the fac-
tory-provided version the main measuring value is the oxygen saturation in % and the second measuring value is
the oxygen concentration in mg/l.
For configuration of the main measuring value do the following steps:
1. open the menu „main value“
2. select the main measuring value
main measuring value
second measuring value
%
oxygen saturation in %
oxygen concentration in mg/l
mg/l
oxygen concentration in mg/l
oxygen saturation in %

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Select the position you would like to use by using the buttons or . Press the -button to accept
and save the entry. To cancel the input dialogue without saving the value press + .
8.4 Calibration oxygen
Menu structure
Passwort
pass word
Kalibrieren
calibrate
Temp.Offs.
temp. offs.
Einpunkt
one point
Automatik
automatic
zurueck
back
Anstieg
slope
B>20°C
zurueck
back
Eingabe
input
B<20°C
CAL INFORMATION
Open with + password the calibration menu.
All kinds of calibration method will be displayed. Choose now your method.
Please take note for all calibration method the temperature compensation.
8.4.1 Data input
Data input stands for the input of the specific values of the connected sensor, for example as determined at the
laboratory before.
Select the corresponding calibration value whose settings you want to change. An input dialogue will now enable
you to change the values within corresponding limits. If you exceed these you will get an error message to
prompt you to enter a value within the fixed limits.
Select the position you would like to change by using the buttons or and change with or .
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .
8.4.2 Settings of the Temperature Offset
This menu item enables you to set a temperature value offset. For this purpose open the menu item „temp.offs”.
Now, an input dialogue will be displayed which facilitates the setting. The offset can be positive or negative.
Select the position you would like to change by using the buttons or and change with or .
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .
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8.4.3 Single-Point Calibration „One point“
Calibrate the measuring signal at this one point using a defined calibration solution or a known set point value,
e. g. determined by a separate method or by means of another laboratory/field instrument. At first, you will be
prompted to dip the sensor into the corresponding calibration medium.
After this step press . to accept the dialogue. Now, the currently measured value will be displayed. After the
measured value has attained a stable state, accept the dialogue again by pressing . You will now be
prompted to enter the set point value.
Select the position you would like to change by using the buttons or and change with or .
Press the -button to accept and save the entry. To cancel the input dialogue without saving the value press
+ .
As a result, you will now be given the new calibration values that will be save in the device.
8.4.4 Automatic Calibration
The automatic calibration of the oxygen content measurement is a single-point calibration in the ambient air up to
102%.
At first, you will be prompted to dip the sensor into the corresponding calibration medium (outside air).
After this step press to accept the dialogue. Now, the currently measured value will be displayed. After the
measured value has attained a stable state, accept the dialogue again by pressing .
As a result, you will now be given the new calibration value that will be save in the device.
8.4.5 Calibration error
In each device predefined ranges for the calibration values are stored. If the determined calibration value is out of
the range the message !Out of limit! appears in the calibration information CAL INFORMATION. The deter-
mined calibration value will be stored nevertheless, so that the measuring and controlling is secured. In this case
a new calibration or a replace of the sensor / sensor part (membrane head, electrolyte) is necessary.
9 LF 40
9.1 Application Fields LF 40
The LF 40 measures the electrical conductivity, the salinity and the temperature in accordance with the German
standard methods for the examination of water, waste water and sludge and combines the features for mobile
application in the field with the precision and comfort of a laboratory meter. LF 40 features simultaneous meas-
urement of conductivity, temperature and salinity, high measuring accuracy, multi function display with plaint text
menu structure, integrated data logging system and a rugged watertight IP 65 enclosure.
9.2 Construction LF 40
LF 40/Set comes completely with the conductivity sensor LTC0,35/23-K010-U and accessories in a protective
case. This combination operates in accordance with the standardized requirements for determination of conduc-
tivity; electrochemical probe method acc. EN ISO 27888:1993. The instrument in connection with the sensor indi-
cates the conductivity in aqueous solutions in µS or mS as well as the relevant temperature simultaneously.
All Meinsberg Conductivity Sensors are available with fixed cable and connector BK. The description of the used
conductivity sensor is listed in the separate instructions for use for the sensor.

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9.3 Configuration LF 40
The entire structure of the menu is displayed graphically in chapter 3.2.
Open with + password the configuration menu.
Select the menu item you would like to configuration.
data logger
temperature
meas.range
general
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9.3.1 Configuration of the fix temperature
The analysis parameter conductivity can be calculated with a temperature compensation. For that the tempera-
ture of the measuring and of the calibration fluid must be measured or a fix temperature must be configured. If
the fix temperature is activated this will be used for the temperature compensation, in this case the message Fix
appears in the right upper display corner.
For configuration the fix temperature do the following steps:
1. open the menu „temperature“
2. activate / deactivate the fix temperature in the menu item „fixed temp.“
3. enter the fix temperature value in the menu item „temp.-value“
Select the position you would like to change by using the buttons or and change with or .
Press the -button to accept and save the entry.
To cancel the input dialogue without saving the value press + .
9.3.2 Configuration of the measuring range „meas. range“
For measuring the conductivity in a proper accuracy the actual conductivity measuring range has to be config-
ured. The useful measuring ranges depend on the cell constant and on the measuring cell used.
For configuration of the measuring range do the following steps:
1. open the menu „meas.range“
2. select the actual measuring range
0...200 µS
0...2000 µS
0...20 mS
0...500 mS
Auto > automatically selects the correct range
TDS > shows the calculated value as a by-value
Resist > shows the calculated value as a by-value
Salin > shows the calculated value as a by-value
Select the position you would like to change by using the buttons or . Press the -button to ac-
cept and save the entry. To cancel the input dialogue without saving the value press + .

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9.4 Calibration conductivity
Menu structure
Passwort
pass word
Kalibrieren
calibrate
Temp.Offs.
temp.offs.
Einpunkt
one point
Automatik
automatic
zurueck
back
Zellkonst.
cell const.
LIN TempKoef
LIN TempCoef
Eingabe
input
zurueck
back
Kabeloffset
cable offset
CAL INFORMATION
TDS Faktor
TDS factor
Open with + password the calibration menu.
All kinds of calibration method will be displayed. Choose now your method.
Take note of temperature compensation for all calibration methods. This means, if measured values are compen-
sated by temperature measurement, the associated temperature sensor must also be dipped into the calibration
medium to be able to determine the exact temperature.
Carefully rinse electrode with distilled/deionized water after each measurement to avoid carrying off of the meas-
uring medium and sluggish measurement.
The Sensor will be dipped in the buffer solution. Wait until the value is stabilised.
9.4.1 Data input
Data input stands for the input of the specific values of the connected sensor, for example as determined at the
laboratory before.
Select the corresponding calibration value whose settings you want to change. An input dialogue will now enable
you to change the values within corresponding limits. If you exceed these you will get an error message to
prompt you to enter a value within the fixed limits.
cell const. cell constant
nLF/LIN temp coef. temperature compensation + temperature coefficient
cable offset. cable offset
TDS factor TDS faktor
back back
Settings for temperature compensation:
Lin: Linear temperature compensation with adjustable temperature coefficient
nLF: non-linear temperature compensation for natural water according to DIN EN 27888.
off: For measuring without temperature compensation the temperature coefficient in Lin must be set at
„0 %/K“.
In Case of measurements with temperature compensation the conductivity value will be calculated to the
reference temperature of 25 °C.
The salinity measuring (second value) will be calculated every time regarding a reference temperature of
15 °C (according to IOT).
For calculation of TDS (second value) the nonlinear temperature compensation with a reference temper-
ature of 25 °C will be used every time.
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