Multi 3400i
Operating manual
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pH/Dissolved Oxygen/Conductivity
Measuring Instrument
ba75688e01 01/2007
Accuracy when
going to press
Warranty We guarantee the instrument described for 3 years from the date of
The use of advanced technology and the high quality standard of our
instruments are the result of continuous development. This may result
in differences between this operating manual and your instrument. Also, we cannot guarantee that there are absolutely no errors in this manual. Therefore, we are sure you will understand that we cannot accept
any legal claims resulting from the data, figures or descriptions.
purchase.
The instrument warranty covers manufacturing faults that are discovered within the warranty period. The warranty does not cover components that are replaced during maintenance work, e.g. batteries.
The warranty claim extends to restoring the instrument to readiness for
use but not, however, to any further claim for damages. Improper handling or unauthorized opening of the instrument invalidates any warranty claim.
To ascertain the warranty liability, return the instrument and proof of
purchase together with the date of purchase freight paid or prepaid.
Copyright
© Weilheim 2007, WTW GmbH
Reproduction in whole - or even in part - is prohibited without the express written permission of WTW GmbH, Weilheim.
Printed in Germany.
Multi 3400i List of contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 SETs of equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.5 Jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.6 Operating structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 12
3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Switching on the measuring instrument . . . . . . . . . . . . . 15
4.2 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . 16
4.2.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 18
4.2.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 19
4.2.4 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3 Dissolved oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3.1 General information . . . . . . . . . . . . . . . . . . . . . . 26
4.3.2 Measuring the D. O. concentration . . . . . . . . . . 27
4.3.3 Measuring the D. O. saturation . . . . . . . . . . . . . 28
4.3.4 AutoRead AR (Drift control) . . . . . . . . . . . . . . . 29
4.3.5 D. O. calibration . . . . . . . . . . . . . . . . . . . . . . . . 30
4.3.6 Salt content correction . . . . . . . . . . . . . . . . . . . 33
4.4 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 34
4.4.2 Measuring the conductivity . . . . . . . . . . . . . . . . 36
4.4.3 Measuring the salinity . . . . . . . . . . . . . . . . . . . . 36
4.4.4 AutoRead AR (Drift control) . . . . . . . . . . . . . . . 37
4.4.5 Determining the cell constant (Calibration in the
control standard) . . . . . . . . . . . . . . . . . . . . . . . . 38
4.5 Calibration intervals (Int 3, Int 4, Int 5) . . . . . . . . . . . . . . 41
4.6 Saving data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.6.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 42
4.6.2 Switching on AutoStore (Int 1) . . . . . . . . . . . . . 44
4.6.3 Outputting the data storage . . . . . . . . . . . . . . . . 46
4.6.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 52
4.7 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.7.1 Data transmission interval (Int 2) . . . . . . . . . . . 53
3
List of contents Multi 3400i
4.7.2 PC/external printer (RS232 interface) . . . . . . . . 55
4.7.3 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.8 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
4.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 63
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.1 pH system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.2 Oxi system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
6.3 Conductivity system messages . . . . . . . . . . . . . . . . . . . 68
6.4 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
4
Multi 3400i Overview
1Overview
1.1 General features
The compact precision handheld meter Multi 3400i enables you to carry out pH measurements, dissolved oxygen (D. O.) measurements and
conductivity measurements quickly and reliably.
The Multi 3400i handheld meter provides the maximum degree of operating comfort, reliability and measuring certainty for all applications.
The proven MultiCal
®
and OxiCal® calibration procedures and the procedures to determine/set up the cell constant support you in your work
with the meter. The special AutoRead function enables precise measurements.
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1 Keypad
2 Display
3 Jack field
Note
If you need further information or application notes, you can obtain the
following material from WTW:
z Application reports
z Primers
z Safety datasheets.
You will find information on available literature in the WTW catalog or
via the Internet.
5
Overview Multi 3400i
1.2 SETs of equipment
The measuring instrument is also available as part of individual SETs
of equipment.
You will find additional information on this and other accessories in the
WTW catalog or via the Internet.
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15
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Set (sample configuration):
1 Multi 3400i meter, carrying strap with 2 carrying clips, armoring
2 Cond/Oxi beaker with beaker clip
3 pH beaker
4 Stand
5 Plastic beaker
6 Storing solution for pH electrodes
6
Multi 3400i Overview
7 50 ml pH buffer solution, STP 4
8 50 ml pH buffer solution, STP 7
9 Calibration and control standard for conductivity measuring
cells, 50 ml
10 50 ml ELY/G electrolyte solution for D.O. probes
11 50 ml RL/G cleaning solution for D.O. probes
12 WP 90/3 exchange membrane heads for D. O. probes
(3 pieces)
13 SF 300 abrasive film for D.O. probes
14 Conductivity measuring cell
– TetraCon® 325-3 or
– TetraCon® 325
15 pH electrode
– SenTix 41-3 or
– SenTix 41
16 Oxygen sensor
– CellOx 325-3 or
– CellOx 325
17 Operating manual + short operating manual
18 Equipment case
19 Plug-in power supply unit
7
Overview Multi 3400i
1.3 Keypad
STOM
ARRCLCAL
RUN/ENTER
Key functions
M
STO
CAL
RCL
AR
Select the measured variable <M>:
– pH value / ORP voltage
– D. O. concentration / D. O. saturation
– Conductivity / salinity
Save a measured value
<STO>
Switch measuring instrument on/off
<ON/OFF>
Calibrate the currently set measured variable
<CAL>
Display/transmit measured values
<RCL>
Activate/deactivate the AutoRead function
<AR>
Select the measuring mode, increase values,
scroll
<▲ >
Select the measuring mode, decrease values,
scroll
<▼ >
RUN/ENTER
Confirm entries, start AutoRead,
output measured values
<RUN ENTER>
8
Multi 3400i Overview
1.4 Display
Status display
TDS
UpH SalO
S
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8
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
1.5 Jack field
8
8.
AutoCal DIN
Tref20
Lin
Cal
AutoCal TEC
8
mV/pH
%
m
mbar
1/
°
F
8
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
Sal
K
/
cm
TP
RCL
Sensor symbol
Meas. value display
Function and
temperature display
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123
1 D. O. probe or conductivity measuring cell
2 pH electrode
3 pH temperature sensor
4 Plug-in power supply unit
5 RS232 serial interface
5
9
Overview Multi 3400i
1.6 Operating structure
The following overview diagram shows which keys you have to press
to select between the different measuring modes:
Note
When a D. O. probe or a conductivity measuring cell with a temperature
probe is connected, the measuring instrument recognizes the probe or
measuring cell and automatically switches to the oxygen measuring
mode or conductivity measuring mode last selected. As soon as the
probe/measuring cell is disconnected, the instrument switches to the
pH or ORP measuring mode.
10
Multi 3400i Safety
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the measuring instrument. Consequently, all responsible personnel must read this
operating manual carefully before working with the measuring system.
The operating manual must always be available within the vicinity of the
measuring system.
Target group The measuring instrument 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 The individual chapters of this operating manual use the following safe-
ty instruction to indicate various types of danger:
Warning
indicates instructions that must be followed precisely in order to avoid
the possibility of slight injuries or damage to the instrument or the environment.
Further notes
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating manuals.
2.1 Authorized use
The authorized use of the measuring instrument consists exclusively of
the:
z pH and ORP measurement
z measurement of the oxygen content and
z measurement of the conductivity, salinity and temperature
in the field and laboratory.
The technical specifications as given in chapter 7 T
be observed. Only the operation and running of the measuring instrument according to the instructions given in this operating manual is authorized. Any other use is considered to be unauthorized.
ECHNICAL DATA must
11
Safety Multi 3400i
2.2 General safety instructions
This instrument is built and inspected according to the relevant guidelines and norms for electronic measuring instruments (see chapter 7
T
ECHNICAL DATA).
It left the factory in a safe and secure technical condition.
Function and operating
safety
Safe operation If safe operation is no longer possible, the instrument must be taken out
The smooth functioning and operational safety of the measuring instrument 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 measuring instrument can only be guaranteed under the environmental conditions that
are in specified in chapter 7 T
ECHNICAL DATA.
If the instrument was transported from a cold environment to a warm
environment, the formation of condensate can lead to the faulty functioning of the instrument. In this event, wait until the temperature of the
instrument reaches room temperature before putting the instrument
back into operation.
of service and secured against inadvertent operation!
Safe operation is no longer possible if the measuring instrument:
z has been damaged in transport
z has been stored under adverse conditions for a lengthy period of
time
Obligations of the pur-
chaser
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 instrument.
The purchaser of the measuring instrument 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.
12
Multi 3400i Commissioning
3 Commissioning
3.1 Scope of delivery
z Multi 3400i handheld meter
z Plug-in power supply unit
z Operating manual and short operating manual
z 4 batteries, 1.5 V Mignon type AA (in the instrument)
Setting the date and
time
For details of scope of delivery of SETs, see section 1.2 SET
EQUIPMENT and WTW catalog.
3.2 Initial commissioning
Perform the following activities:
z Set the date and time
z Connect the plug-in power supply (optional)
1 Press the <M> key and hold it down.
2 Press the <ON/OFF> key.
The display test appears briefly on the display.
3 Press the <RUN/ENTER> key repeatedly until the date ap-
pears on the display.
4 Set the date of the current day with <▲> <▼>.
5 Confirm with <RUN/ENTER>.
The date (month) flashes in the display.
S OF
6 Set the current month with <▲> <▼>.
7 Confirm with <RUN/ENTER>.
The year appears on the display.
8 Set the current year with <▲> <▼>.
9 Confirm with <RUN/ENTER>.
The hours flash on the display.
10 Set the current time with <▲> <▼>.
11 Confirm with <RUN/ENTER>.
The minutes flash on the display.
12 Set the current time with <▲> <▼>.
13
Commissioning Multi 3400i
13 Confirm with <RUN/ENTER>.
The instrument switches to a measuring mode.
14 Switch the instrument off using <ON/OFF>.
Connecting the
plug-in power supply
You can either operate the measuring instrument with batteries or with
the plug-in power supply. The plug-in power supply supplies the measuring instrument with low voltage (12 VDC). This saves the batteries.
Warning
The line voltage at the operating site must lie within the input voltage
range of the original plug-in power supply (see chapter 7 T
TA).
ECHNICAL DA-
Warning
Use original plug-in power supplies only (see
chapter 7 T
ECHNICAL DATA).
2
1
3
14
1 Plug the jack (1) into the socket (2) of the measuring instru-
ment.
2 Connect the original WTW plug-in power supply (3) to an easily
accessible mains socket.
Multi 3400i Operation
4 Operation
4.1 Switching on the measuring instrument
1 Press the <ON/OFF> key.
The display test appears briefly on the display.
After this, the measuring instrument automatically switches to
the measuring mode.
Measuring mode when
switching on
Connected sensor Measuring mode
No sensor or pH/ORP electrode pH or ORP measurement (de-
pending on the last selected setting)
D. O. probe or conductivity measuring cell
2 sensors of any type Last selected measuring mode
Note
The measuring instrument has an energy saving feature to avoid unnecessary battery depletion. The energy saving feature switches the
measuring instrument off if no key has been pressed for an hour.
The energy saving feature is not active
z if the power is supplied by the plug-in power supply,
z if the AutoStore function is active,
z if the communication cable and a PC with a running communication
program are connected,
z if the printer cable is connected (for external printers).
Last selected measuring mode
AutoRange measurement range selection
There are several measuring ranges available for both oxygen and
conductivity measurements. As a rule, the measuring instrument is in
the measuring range with the highest possible resolution. If a measuring range is exceeded, AutoRange causes the measuring instrument to
change automatically to the next higher measuring range.
The AutoRange function is always active with oxygen and conductivity
measurements and cannot be switched off.
Note
The measuring ranges for oxygen and conductivity measurements can
be found in chapter 7 T
ECHNICAL DATA.
15
Operation Multi 3400i
4.2 pH value / ORP voltage
4.2.1 General information
Preparatory activities Perform the following preparatory activities when you want to measure:
1 Connect the pH electrode to the measuring instrument.
If necessary, press the <M> key repeatedly until the status dis-
play pH (pH measurement) or U (measurement of the ORP
voltage) appears.
2 Adjust the temperature of the buffer solutions or test solutions,
or measure the current temperature, if you measure without a
temperature sensor.
3 Calibrate or check the measuring instrument with the elec-
trode.
4Using <▲ > <▼>, toggle between the pH or mV measuring
modes.
Note
Incorrect calibration of pH electrodes leads to incorrect measured values. Calibrate regularly before measuring. You can only connect electrodes of the NTC30 type or without temperature sensor.
Warning
When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result. The RS232
interface is not galvanically isolated.
16
Multi 3400i Operation
Temperature measure-
ment in pH measure-
ments
You can perform pH measurements with or without a temperature sensor as well as with the temperature sensor of an oxygen sensor or a
conductivity measuring cell. The measuring instrument recognizes
which sensors are connected and switches automatically to the correct
mode for the temperature measurement.
The following cases are distinguishable.
Temperature sensor Display Mode
pH Cond or
Oxi
yes - TP Automatic with
pH temperature sensor
yes yes TP
- - Manual
-yesTP
flashes
The temperature value of the
second probe (Cond or Oxi) in
the same sample is taken
over for the pH measurement*
* If you do not wish that, you can:
– either disconnect the 2nd sensor and use the manual temperature
input or
– use an electrode with a temperature sensor.
If a temperature sensor is connected, it is indicated on the display by
TP.
Note
When calibrating without a temperature sensor (no TP display indicator
displayed), enter the current temperature of the respective buffer solution manually using the <▲> <▼> keys while keeping the <RUN/EN-
TER> key depressed.
17
Operation Multi 3400i
4.2.2 Measuring the pH value
1 Perform the preparatory activities according to section 4.2.1.
2 Immerse the pH electrode in the test sample.
3 Press the <▲> <▼> keys until pH appears in the status display.
The pH value appears on the display.
AutoRead AR
(Drift control)
TDS
S
6
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
4 When measuring without a connected temperature sensor:
Options:
z Determine the current temperature using a thermometer
z TP display indicator not displayed, socket for the second
The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable impact on the reproducibility of the measured values.
pH
9
2
8
AutoCal DIN
Tref20
Lin
Cal
AutoCal TEC
and, while keeping the <RUN/ENTER> key depressed, enter this temperature value with <▲> <▼>.
probe is free:
Connect the second probe (Oxi or Cond) and immerse it in
the same sample. TP flashes, the temperature is automatically measured using the second probe.
9
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SalOU
mV/pH
%
m
mbar
1/
°
F
8
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
18
For identical measurement conditions, the following criteria apply:
Reproducibility Response time
Better than 0.02 > 30 seconds
1 Call up the pH measuring mode with <▲> <▼>.
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
Multi 3400i Operation
3 Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
This measured value is transmitted to the interface.
4 If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
5 To terminate the AutoRead function: Press the <AR> key.
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
4.2.3 Measuring the ORP voltage
In conjunction with an ORP electrode, e.g. SenTix ORP, the measuring
instrument can measure the ORP voltage (U) of a solution.
1 Perform the preparatory activities according to section 4.2.1.
2 Submerse the Redox electrode in the sample.
3 Press the <▲> <▼> keys until the U status display appears.
The ORP voltage (mV) of the sample appears on the display.
4 Wait for a stable measured value.
Lin
2
8
Tref20
Cal
pH
U
2
AutoCal DIN
AutoCal TEC
3
4
SalO
mV
%
m
mbar
1/
°
F
8
Auto
ARng
/pH
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
TDS
S
8
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
Note
ORP electrodes are not calibrated. However, you can check ORP electrodes using a test solution.
19
Operation Multi 3400i
4.2.4 pH calibration
Why calibrate? pH electrodes age. This changes the asymmetry (zero point) and slope
of the pH electrode. As a result, an inexact measured value is displayed. Calibration determines the current values of the asymmetry
and slope of the electrode and stores them in the measuring instrument. Thus, you should calibrate at regular intervals.
When to calibrate? z After connecting another electrode
z When the sensor symbol flashes:
– after the calibration interval has expired
– after a voltage interruption, e. g. after changing the batteries
AutoCal TEC is specially matched to the WTW technical buffer solutions as a fully au-
tomatic two-point calibration. The buffer solutions are automatically
recognized by the measuring instrument. Depending on the instrument
setting (see section 4.8 C
ONFIGURATION), the instrument displays the
relevant buffer nominal value or the current electrode voltage in mV.
The calibration can be terminated after the first buffer solution. This corresponds to a single-point calibration. To do this, the instrument uses
the Nernst slope (-59.2 mV/pH at 25 °C) and determines the asymmetry of the electrode.
AutoRead The calibration procedure automatically activates the AutoRead func-
Displaying the calibra-
tion data
Printing the
calibration protocol
tion.
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
You can view the data of the last calibration on the display. The proceeding is described on page 48.
The calibration record contains the calibration data of the current calibration. You can transmit the calibration protocol to a printer via the serial interface (see O
INTERFACE, page 51).
UTPUTTING THE CALIBRATION PROTOCOL ON THE
Note
You can automatically print a calibration record after the calibration. To
do so, connect a printer to the interface according to section 4.7.2 before calibrating. After a valid calibration, the record is printed.
20
Multi 3400i Operation
Sample printout:
CALIBRATION PROTOCOL
02.03.01 14:19
Device No.: 12345678
Calibration pH
Cal time: 01.03.01 / 15:20
Cal interval: 7d
AutoCal TEC Tauto
Buffer 1 2.00
Buffer 2 4.01
Buffer 3 7.00 *
Buffer 4 10.00
C1 184.1 mV 25.0°C
C2 3.0 mV 25.0°C
S1 -59.4 mV/pH
ASY1 - 4 mV
Probe: +++
Calibration evaluation After calibrating, the measuring instrument automatically evaluates the
calibration. The asymmetry and slope are evaluated separately. The
worst evaluation appears on the display.
Display Asymmetry
[mV]
-15 ... +15 -60.5 ... -58
-20 ... +20 -58 ... -57
-25 ... +25 -61 ... -60.5
-30 ... +30 -62 ... -61
Clean the electrode according
to the electrode operating
manual
Slope
[mV/pH]
or
-57 ... -56
or
-56 ... -50
E3
Eliminate the error according to
chapter 6 W
HAT TO DO IF...
< -30 or
> 30
... -62 or
... -50
21
Operation Multi 3400i
Preparatory activities
AutoCal TEC For this procedure, use any two WTW technical buffer solutions (pH
1 Connect the pH electrode to the measuring instrument.
If necessary, press the <M> key repeatedly until the status dis-
play pH (pH measurement) or U (measurement of the ORP
voltage) appears.
2 Keep the buffer solutions ready.
3 Adjust the temperature of the solution and measure the current
temperature if the measurement is made without the use of a
temperature sensor (the TP display indicator is missing from
the display).
values at 25 °C: 2.00 / 4.01 / 7.00 / 10.01).
Note
The calibration for pH 10.01 is optimized for the WTW technical buffer
solution TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead
to an erroneous calibration. The correct buffer solutions are given in the
WTW catalog or in the Internet.
Note
The buffer solutions are automatically recognized by the measuring instrument. Depending on the instrument setting (see section
4.8 C
ONFIGURATION), the instrument displays the relevant buffer nomi-
nal value or the current electrode voltage in mV.
Starting the calibration
Note
Skip the steps 2 and 7 if you use a pH electrode with temperature sensor or the temperature sensor of a conductivity measuring cell or a D.
O. probe.
1 Press the <CAL> key. The Ct1 display and the function display
AutoCal TEC appears. The sensor symbol displays the evaluation of the last calibration (or no sensor symbol in the delivery
state or after the measurement parameter has been reset).
22
Multi 3400i Operation
TDS
S
C
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
2 If required, enter the temperature of the first buffer solution,
while keeping the <RUN/ENTER> key depressed, using <▲>
<▼>.
3 Immerse the pH electrode in the first buffer solution.
4 Press the <RUN/ENTER> key.
The AR display indicator flashes.
The electrode voltage (mV) or the buffer nominal value appears on the display. Example:
7
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
pH
OU
Sal
/pH
mV
%
mg/l
m
S/
cm
cm
M
t
2
8
AutoCal DIN
Tref20
Cal
Lin
AutoCal TEC
3
22
0
AutoCal DIN
Tref20
Cal
Lin
AutoCal TEC
mbar
1
Sal
cm
1/
TP
°
K
%
/
°
C
F
8
4
44
Store
Auto
ARng
AR
RCL
TDSTDS
mV
SS
cm
cm
TP
°
°
C
F
88
Store
Auto
ARng
AR
RCL
7
11
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
Lin
0
0
Tref20
Cal
pHpH
OO UpHUpH SalSal
03
AutoCal DIN
AutoCal TEC
mbarmbar
mV/pHmV/pH
%%
mm
1/1/
°
Auto
ARng
F
mg/lmg/l
S/S/
°
cmcm
MM
cm
%%
C
Store
ARAR
AR
//
cm
SalSal
KK
RCL
TP
5 When the measured value is stable, Ct2 appears.
Lin
t
8
Tref20
Cal
pH
OU
2
2
4
AutoCal DIN
AutoCal TEC
Sal
mV
%
m
mbar
1/
°
F
8
Auto
ARng
/pH
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
23
TDS
S
C
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
Note
At this point, the AutoCal TEC calibration can be terminated with <M>.
This corresponds to a single-point calibration. To do this, the instru-
ment uses the Nernst slope (-59.2 mV/pH at 25 °C) and determines the
asymmetry of the electrode.
Operation Multi 3400i
6 Thoroughly rinse the electrode with distilled water.
7 If required, enter the temperature of the first buffer solution,
while keeping the <RUN/ENTER> key depressed, using <▲>
<▼>.
8 Immerse the pH electrode in the second buffer solution.
9 Press the <RUN/ENTER> key.
The AR display indicator flashes.
The electrode voltage (mV) or the buffer nominal value appears on the display. Example:
TDS
mV
S
1
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
10 When the measured value is stable, AR disappears. The value
of the slope (mV/pH) appears on the display. The probe symbol
shows the evaluation of the current calibration.
TDS
22
0
Tref20
Lin
44
AutoCal DIN
Cal
AutoCal TEC
pH
OU
S
9
1
Time
Day.Month
Year
LoBat
5
Baud
No.
Ident
Tref25
nLF
Tref20
Lin
S
Cal
4
L
AutoCal DIN
AutoCal TEC
cm
TP
°
°
C
F
88
Store
Auto
ARng
AR
RCL
Sal
mV/pH
%
mg/l
m
S/
cm
cm
M
mbar
Sal
cm
1/
TP
°
K
%
/
°
C
F
O
Store
Auto
ARng
AR
RCL
TDS
S
4
1
Time
Day.Month No.
Year
Tref25
LoBat
nLF
Baud
Ident
Lin
08
0
Tref20
Cal
pHpH
OO UpHUpH SalSal
14
AutoCal DIN
AutoCal TEC
mbarmbar
mV/pHmV/pH
%%
mm
1/1/
°
F
Auto
ARng
mg/lmg/l
S/S/
MM
cm
°
%%
C
Store
ARAR
AR
cmcm
cmcm
SalSal
TP
KK
//
RCL
24
11 Press the <RUN/ENTER> key. The value of the asymmetry
(mV) appears on the display.
Multi 3400i Operation
No.
Lin
0
8
Tref20
Cal
pH
OU
2
S
AutoCal DIN
AutoCal TEC
Sal
mV
%
m
mbar
1/
°
F
YA
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
TDS
S
6
1
Baud
Time
Day.Month
Year
Ident
Tref25
LoBat
nLF
12 Switch to the measuring mode with <M>.
25
Operation Multi 3400i
4.3 Dissolved oxygen
4.3.1 General information
Note
D. O. measurements with the Multi 3400i can only be carried out using
a CellOx 325 or StirrOx G D. O. probe. The stirrer of the StirrOx G
D. O. probe has to be supplied with voltage separately using the
NT/pH Mix 540 power supply.
You can measure the following variables:
z D. O. concentration
z D. O. saturation
The measuring instrument is supplied with the following functions:
z AutoRange (automatic switchover of the measurement range),
z The AutoRead function (drift control) for checking the stability of the
measurement signal. This ensures the reproducibility of the measuring signal. For details of how to switch the AutoRead function on/off,
see page 29.
Warning
When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result.
The RS232 interface is not galvanically isolated.
Preparatory activities Perform the following preparatory activities when you want to measure:
1 Connect the D. O. probe to the measuring instrument. The in-
strument automatically switches over to D. O. measurement
(O
status display).
2
If the D. O. probe is already connected, press the <M> repeat-
edly until the O
status display appears.
2
2 Calibrate or check the measuring instrument with the sensor.
How to calibrate is described in section 4.3.5 from page 20.
3 Use <▲> <▼> to toggle between the measuring modes, D. O.
concentration (mg/L) and D. O. saturation (%).
Note
Incorrect calibration of D. O. probes will result in incorrect
measured values. Calibrate at regular intervals.
Temperature sensor The D. O. probe has an integrated temperature sensor that always
measures the current temperature of the test sample.
26
Multi 3400i Operation
4.3.2 Measuring the D. O. concentration
When measuring the concentration of test samples with a salt content
of more than 1 g/l, a salinity correction is required.
Note
How to enter the current salt content is described in section 4.3.6 S
CONTENT CORRECTION on page 33.
Switching the salt content correction on or off, see below.
To measure the D. O. concentration with and without salt content correction, proceed as follows:
1 Perform the preparatory activities according to section 4.3.1.
2 Immerse the D. O. probe in the test sample.
3 Press the <▲> <▼> key repeatedly until the D. O. concentra-
tion in mg/l appears on the display.
ALT
Switching on/off the salt
content correction
Lin
U
9
8
Tref20
Cal
pH
O
2
1
7
AutoCal DIN
AutoCal TEC
Sal
mV
%
m
mbar
1/
°
F
6
Auto
ARng
/pH
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
TDS
S
7
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
Proceed as follows to switch on the salt content correction:
1 Perform the preparatory activities according to section 4.3.1.
2 Immerse the D. O. probe in the test sample.
3 While pressing the <RUN/ENTER> key, switch on the salt con-
tent correction with <▲> . The SAL display indicator appears
on the display. The specified salt content is taken into consideration during the measurement.
27
Operation Multi 3400i
TDS
UpH Sal
O
7
mV/pH
%
m
mbar
1/
°
F
6
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
S
4
5
1
Baud
Time
Day.Month No.
Year
Ident
8
Tref20
Tref25
LoBat
4 While pressing the <RUN/ENTER> key, switch off the salt con-
4.3.3 Measuring the D. O. saturation
Lin
nLF
tent correction with <▼>. The SAL display indicator is no longer
displayed.
1
Cal
2
AutoCal DIN
AutoCal TEC
You can measure the D. O. saturation as follows:
1 Perform the preparatory activities according to section 4.3.1.
2 Immerse the D. O. probe in the test sample.
3 Press the <▲> <▼> key repeatedly until the D. O. saturation in
% appears on the display.
TDS
UpH Sal
O
7
mV/pH
%
m
mbar
1/
°
F
6
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
S
8
1
Time
Day.Month No.
Year
Tref25
LoBat
nLF
Baud
Ident
Lin
9
8
Tref20
Cal
2
1
AutoCal DIN
AutoCal TEC
28
Multi 3400i Operation
4.3.4 AutoRead AR (Drift control)
The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable impact on the reproducibility of the measured values.
1 Call up the measuring mode with <M> and/or <▲> <▼> .
2 Activate the AutoRead function with <AR>. The current mea-
sured value is frozen (hold function).
3 Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached. This measured value is transmitted to the interface.
TDS
UpH Sal
O
S
7
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
Lin
0
8
Tref20
Cal
8
1
7
AutoCal DIN
AutoCal TEC
mV/pH
%
m
mbar
1/
°
F
6
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
4 If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
5 To terminate the AutoRead function: Press the <AR> key.
Criteria With identical measurement conditions, the following applies:
Measuring mode Reproducibility Response time
D. O. concentration
D. O. saturation index
Better than 0.05 mg/l > 10 seconds
Better than 0.6 % > 10 seconds
29
Operation Multi 3400i
4.3.5 D. O. calibration
Why calibrate? D. O. probes age. This changes the slope of the D. O. probe. Calibra-
tion determines the current slope of the probe and stores this value in
the instrument.
When to calibrate? z After connecting another D. O. probe
z When the probe symbol flashes (after the calibration interval has ex-
pired).
Calibration procedure The calibration is performed in water vapor-saturated air. Use the
®
OxiCal
-SL air calibration vessel (accessories) for the calibration.
AutoRead The calibration procedure automatically activates the AutoRead func-
tion. The AR display indicator flashes. The calibration process is finished when AR stops flashing.
Displaying the calibra-
tion data
Printing the
calibration protocol
You can view the data of the last calibration on the display. The proceeding is described on page 48.
The calibration record contains the calibration data of the current calibration. You can transmit the calibration protocol to a printer via the serial interface (see page 51).
Note
You can automatically print a calibration record after the calibration. To
do so, connect a printer to the interface according to section 4.7.2 before calibrating. After a valid calibration, the record is printed.
Sample printout:
CALIBRATION PROTOCOL
02.03.01 14:19
Device No.: 12345678
CALIBRATION 02
Cal time: 02.03.01 / 14:19
Cal interval: 14d
OxiCal Tauto AR
Relative Slope: 0,88
Probe: +++
30
Multi 3400i Operation
Probe evaluation After the calibration, the measuring instrument evaluates the current
status of the probe against the relative slope. The evaluation appears
on the display. The relative slope has no effect on the measuring accuracy. Low values indicate that the electrolyte will soon be depleted and
the probe will have to be regenerated.
Display Relative slope
S = 0.8 ... 1.25
S = 0.7 ... 0.8
S = 0.6 ... 0.7
E3
S < 0.6 or S > 1.25
Eliminate the error according to
chapter 6 W
HAT TO DO IF...
Starting the calibration Proceed as follows to calibrate the instrument:
1 Perform the preparatory activities according to section 4.3.1.
®
2 Keep the OxiCal
-SL air calibration vessel ready.
Note
The sponge in the air calibration vessel must be moist (not wet). Follow
the instructions in the OxiCal
®
-SL operating manual.
3 Put the D. O. probe into the air calibration vessel.
4 Press the <CAL> key repeatedly until the calibration mode ap-
pears. The sensor symbol displays the evaluation of the last
calibration (or no sensor symbol in the delivery state or after the
measurement parameter has been reset).
31
Operation Multi 3400i
TDS
UpH Sal
O
7
7
mV/pH
%
m
mbar
1/
°
F
6
Auto
ARng
mV/pH
%
m
mbar
1/
6
mg/l
S/
cm
M
cm
°
%
C
Store
AR
mg/l
S/
cm
M
cm
AR
cm
Sal
K
/
cm
Sal
TP
RCL
S
A
C
1
Baud
Time
Day.Month No.
Year
Ident
8
Tref20
Tref25
LoBat
5 Press the <RUN/ENTER> key. AutoRead is active, AR flashes.
nLF
TDS
Lin
L
1
AutoCal DIN
Cal
AutoCal TEC
UpH Sal
O
S
8
0
1
Time
Day.Month No.
Year
Tref25
LoBat
nLF
Baud
Ident
8
Tref20
Lin
1
Cal
8
AutoCal DIN
AutoCal TEC
6 As soon as a stable value is reached, the AR display indicator
stops flashing. The calibration is finished now. The value of the
relative slope appears on the display. The probe symbol shows
the probe evaluation (see page 31).
TDS
UpH Sal
O
7
mV/pH
%
m
mbar
1/
°
F
6
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
S
8
0
1
Baud
Time
Day.Month No.
Year
Ident
8
Tref20
Tref25
LoBat
7 Switch to the measuring mode with <M>.
Note
In chapter 6 W
take for error elimination.
nLF
Lin
8
1
AutoCal DIN
Cal
AutoCal TEC
HAT TO DO IF... page 65, you will find the measures to
32
Multi 3400i Operation
4.3.6 Salt content correction
A salt content correction is required in the oxygen concentration measurement of samples with a salt content of more than 1 g/l. To do this,
you have to enter the salinity equivalent of the test sample (range 0.0 -
70.0) and to switch on the salinity correction.
Note
With the Multi 3400i handheld meter, you can measure the salinity.
How to proceed is described in section 4.4.3 M
on page 36.
EASURING THE SALINITY
Entering the salt con-
tent
1 Determine the salinity of the test sample (any method, see also
section 4.4.3 M
2 Press the <CAL> key repeatedly until Sal appears on the dis-
play.
TDS
UpH Sal
S
5
5
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
3 Enter the salt content with <▲> <▼>.
4 Switch to the measuring mode with <M>.
Note
How to switch on the salt content correction is described on page 27.
Lin
8
Tref20
Cal
6
AutoCal DIN
AutoCal TEC
EASURING THE SALINITY on page 36).
O
mV/pH
%
mg/l
m
S/
cm
cm
M
mbar
0
Sal
cm
1/
TP
°
K
%
/
°
C
F
6
9
Auto
ARng
Store
AR
RCL
33
Operation Multi 3400i
4.4 Conductivity
4.4.1 General information
Note
Conductivity measurements with the Multi 3400i can only be carried out
using the TetraCon 325 measuring cell.
Warning
When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result.
The RS232 interface is not galvanically isolated.
Preparatory activities Perform the following preparatory activities when you want to measure:
1 Connect a conductivity measuring cell to the measuring instru-
ment. The instrument automatically switches over to conductivity measurement (status display ).
If the conductivity measuring cell is already connected, press
the <M> key repeatedly until the status display or Sal ap-
pears.
2 Check the selected cell constant or calibrate the measuring in-
strument with the measuring cell (see below).
3 Check the selected cell constant (see below) or calibrate the
measuring instrument with the measuring cell (see section
4.4.5 on page 38).
4Using <▲ > <▼>, toggle between the measuring modes, con-
ductivity ( in µS/cm) or salinity (SAL).
Temperature probe The TetraCon 325 conductivity measuring cell has a temperature sen-
sor integrated in it. The temperature sensor is shown on the display by
TP.
Temperature
compensation
Reference temperature,
Tref
The nonlinear temperature compensation is set fixed and is shown on
the display by nLF.
The reference temperature (Tref) can be switched between 20 °C and
25 °C. It appears on the display as Tref20 or Tref25. To switch over the
reference temperature, see S
TURE, page 58.
WITCHING OVER THE REFERENCE TEMPERA-
34
Multi 3400i Operation
Checking the
cell constant
1 Press the <RCL> key repeatedly until CAL disp appears on the
display.
TDS
S
C
1
Baud
Time
Day.Month No.
Year
Ident
dS
Tref20
Tref25
LoBat
2 Press the <RUN/ENTER> repeatedly until the last calibrated
Lin
nLF
cell constant is displayed, e. g. 0.472 1/cm.
TDS
S
C
1
Baud
Time
Day.Month No.
Year
Ident
07
Tref20
Tref25
LoBat
nLF
Lin
A
I
Cal
C
4
Cal
OUpH Sal
L
AutoCal DIN
AutoCal TEC
OUpH
L
AutoCal DIN
AutoCal TEC
mV/pH
%
m
mbar
1/
°
F
P
Auto
ARng
Sal
mV/pH
%
m
mbar
1/
°
F
2
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
cm
Sal
K
/
RCL
TP
TP
3 To return to the measuring mode: Press the <M> key when the
correct cell constant is displayed.
4 If you want to recalibrate the cell constant, proceed according
to section 4.4.5 D
IN THE CONTROL STANDARD) .
ETERMINING THE CELL CONSTANT (CALIBRATION
35
Operation Multi 3400i
4.4.2 Measuring the conductivity
You can carry out the conductivity measurements as follows:
1 Perform the preparatory activities according to section 4.4.1
page 34.
2 Immerse the conductivity measuring cell in the test sample.
3 Press the < ▲> <▼> keys until in the status display, and the
unit µS/cm appears. The conductivity value appears on the display.
TDS
S
3
5
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
4.4.3 Measuring the salinity
You can carry out the salinity measurements as follows:
1 Perform the preparatory activities according to section 4.4.1
page 34.
2 Immerse the conductivity measuring cell in the test sample.
3 Press the <▲> <▼> keys until the Sal status display appears.
The salinity value appears on the display.
Lin
8
Tref20
Cal
2
AutoCal DIN
AutoCal TEC
OUpH
0
4
Sal
mV/pH
%
m
mbar
1/
°
F
0
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
36
S
1
Time
Day.Month No.
Year
Tref25
LoBat
nLF
TDS
3
Baud
Ident
Lin
2
8
Tref20
Cal
OUpH
3
2
1
AutoCal DIN
AutoCal TEC
Sal
mV/pH
%
m
mbar
1/
°
F
2
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
Multi 3400i Operation
4.4.4 AutoRead AR (Drift control)
The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable effect on the reproducibility of the measured value.
1 Call up the or SAL measuring mode with <M> and/or <▲ >
<▼>.
2 Immerse the conductivity measuring cell in the test sample.
3 Activate the AutoRead function with <AR>. The current mea-
sured value is frozen (hold function).
4 Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
This measured value is transmitted to the interface.
TDS
S
3
5
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
5 If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
6 To terminate AutoRead: Press the <AR> key.
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>. You can
only change to another measuring mode after completion of AutoRead.
Lin
8
Tref20
Cal
2
AutoCal DIN
AutoCal TEC
OUpH
0
5
Sal
mV/pH
%
m
mbar
1/
°
F
0
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
Sal
K
/
cm
TP
RCL
37
Operation Multi 3400i
4.4.5 Determining the cell constant (Calibration in the control standard)
Why determine the cell
constant?
AutoRead The calibration procedure automatically activates the AutoRead func-
Displaying the calibra-
tion data
Printing the
calibration protocol
Aging slightly changes the cell constant, e. g. by coatings. As a result,
an inexact measured value is displayed. The original characteristics of
the cell can often be restored by cleaning the cell. Calibration determines the current value of the cell constant and stores this value in the
instrument.
Thus, you should calibrate at regular intervals.
In the delivery condition, the cell constant of the measuring instruments
is set to 0.475 cm
-1
(conductivity measuring cell TetraCon 325).
tion. The AR display indicator flashes. The calibration process is finished when AR stops flashing.
You can view the data of the last calibration on the display. The proceeding is described on page 48.
The calibration record contains the calibration data of the current calibration. You can transmit the calibration protocol to a printer via the serial interface (see page 51).
Note
You can automatically print a calibration record after the calibration. To
do so, connect a printer to the interface according to section 4.7.2 before calibrating. After a valid calibration, the record is printed.
Sample printout:
CALIBRATION PROTOCOL
14.04.01 11:37
Device No.: 99990000
Calibration Conductivity
Cal time: 14.04.01 / 11:37
Cal interval: 180d
Cal Std.: 0.01 mol/l KCL
40.0 °C
Conduct./Tref25: 1413µS/cm
Cell Const : 0.478 1/cm
Probe : +++
38
Multi 3400i Operation
Calibration evaluation After the calibration, the measuring instrument automatically evaluates
the current status of the calibration. The evaluation appears on the display.
-1
Display Cell constant [cm
0.450 ... 0.500 cm
]
-1
Determining the
cell constant
E3
Eliminate the error according to
chapter 6 W
HAT TO DO IF...
Outside the range
0.450 ... 0.500 cm
-1
You can determine the cell constant (conductivity measuring cell TetraCon 325) as follows:
1 Press the <CAL> key repeatedly until the status display
CAL CELL appears.
2 Press the <RUN/ENTER> key. The CAL display appears, as
well as
– the current, calibrated cell constant (with sensor symbol on
the display) or
– the fixed cell constant 0.475 1/cm (without sensor symbol
on the display). In this case, the measurement parameters
are initialized (see section 4.9 R
ESET).
TDSTDS
OO UpHUpH SalSal
mV/pHmV/pH
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
Tref20
Lin
Cal
AutoCal TEC
Auto
ARng
Store
AR
TP
RCL
SS
CC
11
Time
Day.Month No.
Year
Tref25
LoBat
nLF
Baud
Ident
0077
Lin
AA
Tref20
Cal
44
AutoCal DINAutoCal DIN
AutoCal TEC
%%
mg/lmg/l
mm
S/S/
cmcm
cmcm
MM
mbarmbar
LL
SalSal
cmcm
1/1/
TP
°°
KK
%%
//
°°
CC
FF
52
Store
Auto
ARng
AR
RCL
3 Immerse the conductivity measuring cell in the control standard
solution, 0.01 mol/l KCI.
4 Press the <RUN/ENTER> key.
The AutoRead measurement to determine the cell constant
starts. The AR display indicator flashes until a stable signal is
reached. The cell constant determined is displayed. The measuring instrument automatically stores the cell constants.
39
Operation Multi 3400i
TDS
S
A
C
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
5 To return to the measuring mode: Press the <M> key. The de-
termined cell constant is taken over for the measurement.
Note
If the error message
4
07
AutoCal DIN
Tref20
Lin
Cal
AutoCal TEC
Sal
OUpH
mV/pH
%
mg/l
m
S/
cm
cm
M
mbar
L
Sal
cm
1/
TP
°
K
%
/
°
C
F
3
Store
Auto
ARng
AR
AR
RCL
appears, refer to chapter 6 W
E3
E3
E3E3
HAT TO DO IF...
40
Multi 3400i Operation
4.5 Calibration intervals (Int 3, Int 4, Int 5)
For each measured variable, a time interval is stored. When it has expired, you will be reminded to calibrate. After a calibration interval has
expired, the probe symbol of the relevant measured variable flashes. It
is still possible to measure. By calibrating the relevant probe, the function is reset and the interval starts anew.
The following calibration intervals are set in the factory:
Measured parameter Designation Default setting
pH/ORP Int 3 7 days
Dissolved oxygen Int 4 14 days
Conductivity Int 5 180 days
Setting the calibration
interval
You can change each of these intervals (1 ... 999 days):
1 Switch off the measuring instrument.
2 Press the <M> key and hold it down.
3 Press the <ON/OFF> key.
The display test appears briefly on the display. After this, the
measuring instrument automatically switches over to configuration.
4 Press the <RUN/ENTER> key repeatedly, until Int 3 ... 5 to-
gether with the required measured variable (pH, O
pears on the display. Example:
TDS
UpH Sal
O
1
mV/pH
%
m
mbar
1/
°
F
4
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
Sal
K
/
cm
TP
RCL
S
n
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
Lin
t
d
Tref20
Cal
4
1
AutoCal DIN
AutoCal TEC
or ) ap-
2
5 Set the required interval until the next calibration with <▲>
<▼>.
6 Confirm with <RUN/ENTER>.
7 Switch to the measuring mode with <M>.
41
Operation Multi 3400i
4.6 Saving data
The Multi 3400i portable measuring instrument has an internal data
memory. It can store up to 500 datasets.
A complete data record consists of:
z Number of the storage location
z Date/time
z Measured values of the probes connected
z Temperature values of the probes connected
z Temperature measuring procedure
z ID number
You can transmit measured values (data records) to the data storage
in two ways:
z Save manually
z Switch on AutoStore (Int 1), see page 44)
4.6.1 Saving manually
You can transmit a measured value to the data storage as follows:
1 Press the <STO> key.
The current number (location number No.) of the next free storage location appears under the current measured value on the
display.
No.
Lin
9
8
Tref20
Cal
pH
9
2
4
AutoCal DIN
AutoCal TEC
SalOU
mV/pH
%
m
mbar
1/
°
F
4
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
TP
RCL
TDS
S
6
1
Baud
Time
Day.Month
Year
Ident
Tref25
LoBat
nLF
2 Confirm with <RUN/ENTER>.
The display switches to entering the ID number.
42
Multi 3400i Operation
Message StoFull
StoFull This message appears when all of the 500 storage locations are occu-
StoFullStoFull
No.
Lin
9
8
Tref20
Cal
pH
9
2
4
AutoCal DIN
AutoCal TEC
SalOU
mV/pH
%
m
mbar
1/
°
F
2
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
Sal
K
/
cm
TP
RCL
TDS
S
6
1
Baud
Time
Day.Month
Year
Ident
Tref25
LoBat
nLF
3 Using <▲> <▼>, enter the required ID number
(1 ... 999).
4 Confirm with <RUN/ENTER>.
The measured values are stored. The instrument changes to
the measuring mode.
pied.
You have the following options:
Saving the current measured value.
The oldest measured value (storage location 1)
will be overwritten by this
Returning to the measuring mode without saving press any key
Outputting the data storage see
Clearing the memory see
Press
<RUN/ENTER>
section 4.6.3
section 4.6.4
43
Operation Multi 3400i
4.6.2 Switching on AutoStore (Int 1)
The save interval (Int 1) determines the chronological interval between
automatic save processes. After the fixed interval has expired, the current data record is transmitted to the internal storage and to the interface.
Switching on AutoStore
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <STO> key. Int 1 appears on the display.
TDS
S
t
n
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
3 Set the required interval between the saving procedures with
<▲> <▼> (Selection: 5 s, 10 s, 30 s, 1 min, 5 min, 10 min,
15 min, 30 min, 60 min).
4 Confirm with <RUN/ENTER>.
The number of free memory locations appears on the display.
TDS
Lin
8
Tref20
Cal
O
AutoCal DIN
AutoCal TEC
S
9
4
1
Baud
Time
Day.Month No.
Year
LoBat
Ident
Tref25
nLF
Lin
F
Tref20
Cal
r
AutoCal DIN
AutoCal TEC
OUpH
1
F
OUpH
9
e
Sal
mV/pH
%
m
mbar
1/
°
F
F
Auto
ARng
Sal
mV/pH
%
m
mbar
1/
°
F
e
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
cm
Sal
K
/
RCL
TP
TP
44
5 Confirm with <RUN/ENTER>.
The prompt for the ID number appears on the display.
Multi 3400i Operation
TDS
S
9
9
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
6 Set the required ID number with <▲> <▼>.
7 Confirm with <RUN/ENTER>.
The measuring instrument switches to the last active measuring mode and start the measuring and saving procedure. Au-
toStore flashes on the display.
As soon as all of the 500 storage locations are occupied, AutoStore is
terminated (Int 1 = OFF). If there are not enough storage locations
available for your measurements:
z Output and backup the data storage (see page 46) and
Lin
F
Tref20
Cal
r
AutoCal DIN
AutoCal TEC
OUpH
9
e
Sal
mV/pH
%
m
mbar
1/
°
F
1
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
Sal
K
/
cm
TP
RCL
z clear the memory (see page 52).
Note
The AutoStore function is interrupted if you start other functions, e.g.
output the data storage. After the other function is finished, the AutoStore function is continued. By this, however, temporal gaps in the recording of the measured values will occur.
Switching off AutoStore Switch AutoStore off by:
z setting the save interval (Int 1) to OFF, or
z switching the measuring instrument off and then on again.
45
Operation Multi 3400i
4.6.3 Outputting the data storage
You can output the contents of the data storage:
z Stored data on the display
z Calibration data on the display
z Stored data on the serial interface
z Calibration protocol to the interface
Outputting stored data
on the display
1 Press the <RCL> key repeatedly until StO dISP appears on the
display.
TDS
S
T
S
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
2 Press the <RUN/ENTER> key.
A measured value appears on the display.
The storage location of the data record is displayed for approx.
2 s, then the respective temperature appears.
TDS
Lin
d
Tref20
Cal
UpH
I
AutoCal DIN
AutoCal TEC
S
0
6
1
Baud
Time
No.
Day.Month
Year
LoBat
Ident
Tref25
nLF
Lin
8
Tref20
Cal
2
AutoCal DIN
AutoCal TEC
OUpH
O
s
O
3
5
Sal
mV/pH
%
m
mbar
1/
°
F
p
Auto
ARng
Sal
mV/pH
%
m
mbar
1/
°
F
0
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
mg/l
S/
cm
M
cm
°
%
C
Store
AR
Sal
K
/
cm
Sal
K
/
cm
TP
RCL
TP
RCL
46
You can perform the following activities:
Display further data of the data record
(ID number, date, time, storage location)
To toggle between two saved measured variables
Advance one data record (storage location) Press <▲>
Go back one data record (storage location) Press <▼>
Press <RUN/ENTER>
Press <RUN/ENTER>
+ <M>
Multi 3400i Operation
Note
If you want to search for a certain element of the data record (e.g. date),
proceed as follows:
1 Using <RUN/ENTER>, select the element (e.g. date).
2 Press <▲> or <▼> repeatedly until the required element ap-
pears on the display.
After approx. 2 s the temperature of the displayed measured
value appears.
Outputting stored data
to the interface
1 Press the <RCL> key repeatedly until Sto SEr appears on the
display.
TDS
S
t
S
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
2 Press the <RUN/ENTER> key.
The complete contents of the storage are transmitted to the interface. During the data transmission the instrument increments the storage numbers. After the data transmission, the
instrument automatically switches to the last active measurement mode.
Note
You can cancel the transmission with <M> or <RUN/ENTER>.
Lin
Tref20
Cal
S
AutoCal DIN
AutoCal TEC
OUpH
o
E
Sal
mV/pH
%
m
mbar
1/
°
F
R
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
Sal
K
/
cm
TP
RCL
The transmitted data contains the entire contents of the storage in incrementing order of the location numbers.
47
Operation Multi 3400i
Sample printout:
No. 1:
09.03.01 17:10
pH 10.01 25 °C
Tauto AR
Ident : 47
No. 2:
09.03.01 17:12
305 mV
Tauto
Ident : 6
No. 3:
09.03.01 17:24
7.88 mg/l 17.6° C
Tauto
Ident : 81
No. 4:
09.03.01 17:46
7.11 mg/l 17.8° C
Tauto
SAL = 17.9
Ident : 4
Outputting the calibra-
tion data
on the display
No. 5:
10.03.01 19:09
2.40 mS/cm 25.3 °C
Tauto
nLF
Tref25 C = 0.475 1/cm
Ident : 10
No. 6:
10.03.01 20:48
2.46 mS/cm 25.6 °C
Tauto
nLF
Tref25 C = 0.475 1/cm
Ident : 1
...
1 Press the <RCL> key repeatedly until CAL disp appears on
the display.
TDS
Sal
OUpH
mV/pH
S
C
1
Time
Day.Month No.
Year
Tref25
LoBat
nLF
Baud
Ident
Lin
A
d
Tref20
Cal
I
AutoCal DIN
AutoCal TEC
L
S
%
m
mbar
1/
°
F
P
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
48
Multi 3400i Operation
2 Press the <RUN/ENTER> key.
The data of the last calibration of all measured variables appears in the following sequence:
z pH: Slope SLO and asymmetry ASY
z Dissolved oxygen: Relative slope SLO
z Cond: Cell constant C
Information concerning the calibration procedure is output as
well.
No.
No.
Lin
Lin
9
Tref20
Cal
0
8
Tref20
Cal
pH
OU
4
S
L
AutoCal DIN
AutoCal TEC
pH
OU
1
A
S
AutoCal DIN
AutoCal TEC
Sal
mV/pH
%
m
mbar
1/
°
F
O
Auto
ARng
Sal
mV
%
m
mbar
1/
°
F
Y
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
mg/l
S/
cm
M
cm
°
%
C
Store
AR
Sal
K
/
Sal
K
/
cm
TP
RCL
cm
TP
RCL
TDS
S
5
1
Baud
Time
Day.Month
Year
Ident
Tref25
LoBat
nLF
3 Press <RUN/ENTER> to display the value of the asymmetry
(mV).
TDS
S
6
1
Baud
Time
Day.Month
Year
Ident
Tref25
LoBat
nLF
4 Press <RUN/ENTER> to display the relative slope of the D. O.
probe.
S
1
Time
Day.Month
Year
LoBat
TDS
0
Baud
No.
Ident
Tref25
nLF
Lin
UpH
8
2
Tref20
Cal
S
AutoCal DIN
AutoCal TEC
O
8
L
Sal
mV/pH
%
m
mbar
1/
°
F
O
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
Sal
K
/
cm
TP
RCL
49
Operation Multi 3400i
5 Press <RUN/ENTER> to display the cell constant. The dis-
played value is:
z the current, calibrated cell constant (with sensor symbol on
the display) or
z the fixed cell constant 0.475 1/cm (without probe symbol on
the display). In this case, the measured parameters are initialized (see section 4.9 R
ESET).
TDS
S
4
1
Baud
Time
Day.Month
No.
Year
Ident
0
Tref20
Tref25
LoBat
6 With <M> you can switch back to the last active measuring
Lin
nLF
mode.
UpH
C
4
Cal
O
8
7
AutoCal DIN
AutoCal TEC
Sal
mV/pH
%
m
mbar
1/
°
F
8
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
50
Multi 3400i Operation
Outputting the calibra-
tion protocol on the
interface
1 Press the <RCL> key repeatedly until CAL SEr appears on the
display.
TDS
Sal
OUpH
mV/pH
S
A
C
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
2 Press the <RUN/ENTER> key.
The calibration protocol for all measured variables is transmitted to the interface. After the data transmission, the instrument
automatically switches to the last active measurement mode.
Sample printout:
CALIBRATION PROTOCOL
02.03.01 14:19
Device No.: 12345678
Lin
d
Tref20
Cal
S
AutoCal DIN
AutoCal TEC
L
E
%
m
mbar
1/
°
F
R
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
Sal
K
/
cm
TP
RCL
Calibration pH
Cal time: 01.03.01 / 15:20
Cal interval: 7d
AutoCal TEC Tauto
Buffer 1 2.00
Buffer 2 4.01
Buffer 3 7.00 *
Buffer 4 10.00
C1 174.1 mV 25.0°C
C2 -133.3 mV 25.0°C
S1 -59.4 mV/pH
ASY1 - 4 mV
Probe: +++
CALIBRATION 02
Cal time: 02.03.01 / 14:19
Cal interval: 14d
OxiCal Tauto AR
Relative Slope: 0,88
Probe: +++
Calibration Conductivity
Cal time: 14.12.00 / 11:37
Cal interval: 180d
Cal Std.: 0.01 mol/l KCL
40.0 °C
Conduct./Tref25: 1413µS/cm
Cell Const : 0.478 1/cm
Probe : +++
51
Operation Multi 3400i
4.6.4 Clearing the memory
With this function, you can delete the stored data records. 500 storage
locations will then be available again.
Note
The Clear memory function only appears when there are data records
stored in the memory. Otherwise, the measuring instrument automatically switches to the last active measuring mode.
Proceed as follows to clear all data records:
1 Switch off the measuring instrument.
2 Press the <STO> key and hold it down.
3 Press the <ON/OFF> key.
The display test appears briefly on the display.
4 Confirm the clearing process with <RUN/ENTER>.
Pressing any other key prevents the clearing, the data records
will remain stored.
Note
The calibration data remain stored and can be called up.
52
Multi 3400i Operation
4.7 Transmitting data
You have the following possibilities of transmitting data:
z One of the following options:
– With the AutoStore function (page 44), measured values are
periodically saved internally (save interval Int 1) and output on the
interface.
– With the Data transmission interval function (Int 2), measured
values are periodically output on the interface (see below).
– AutoStore (Int 1) covers the Data transmission interval
(Int 2).
z Press the <RUN/ENTER> key
This manually triggers a data transmission of the current measured
value to the serial interface at any time - independently of the selected intervals.
z With the Output data storage function (page 46), calibration data or
saved measured values are output on the interface.
Setting the
Data transmission
interval
4.7.1 Data transmission interval (Int 2)
The interval to the data transmission (Int 2) determines the chronological interval between automatic data transmissions. After the selected
interval expires, the current data record is transmitted to the interface.
The default setting for the interval is OFF.
To start the data transmission, set an interval (5 s, 10 s, 30 s, 1 min,
5 min, 10 min, 15 min, 30 min, 60 min):
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <RCL> key. Int 2 appears on the display.
TDS
S
n
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
Lin
t
8
Tref20
Cal
O
AutoCal DIN
AutoCal TEC
OUpH
2
F
Sal
mV/pH
%
m
mbar
1/
°
F
F
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
3 Set the required interval between the saving procedures with
<▲> <▼>.
53
Operation Multi 3400i
4 Confirm with <RUN/ENTER>.
The measuring instrument switches to the last active measuring mode.
Note
When the AutoStore function is active at the same time, the data transmission is performed according to the setting of the save interval (Int 1).
Set the save interval (Int 1) to OFF to activate the Data transmission in-
terval (Int 2).
54
Multi 3400i Operation
CTS
4.7.2 PC/external printer (RS232 interface)
Via the RS 232 interface, you can transmit the data to a PC or an external printer.
Use the AK340/B (PC) or AK325/S (ext. printer) cable.
Warning
The RS232 interface is not galvanically isolated.
When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result.
Set up the following transmission data on the PC/printer:
Baud rate can be selected from: 1200, 2400, 4800, 9600
Handshake RTS/CTS + Xon/Xoff
PC only:
Parity none
Socket assignment
Data bits 8
Stop bits 2
1
2 RxD
2
1
4
3
RS 232
REC
4.7.3 Remote control
The handheld meter can be remotely controlled from a PC. This requires the KOM pilot communication kit. It is available as an accessory.
The instrument is then controlled via commands that simulate keystrokes and request the current display contents.
Note
A more detailed description is provided within the scope of delivery of
the communication kit.
3 Ground
4TxD
55
Operation Multi 3400i
4.8 Configuration
You can adapt the handheld meter to your individual requirements. To
do this, the following parameters can be changed (the status on delivery is marked in bold):
Baud rate 1200, 2400, 4800, 9600
Air pressure display Current value in mbar
(no input possible)
Baudrate
Calibration
intervals
Date/time Any
Note
You can leave the configuration menu at any time with <M> . The parameters that have already been changed are stored.
1 Switch off the measuring instrument.
2 Press the <M> key and hold it down.
3 Press the <ON/OFF> key.
The display test appears briefly on the display. The measuring
instrument then switches automatically to the setting of the
baud rate.
S
1
Time
Day.Month No.
Year
Tref25
LoBat
nLF
TDS
n
Baud
Ident
Lin
t
4
Tref20
Cal
8
AutoCal DIN
AutoCal TEC
OUpH
2
0
Sal
mV/pH
%
m
mbar
°
0
Auto
ARng
– pH 1 ... 7 ... 999 dInt 3
1 ... 14 ... 999 dInt 4
– O
2
– : 1 ... 180 ... 999 dInt 5
mg/l
S/
cm
cm
M
Sal
cm
1/
TP
°
K
%
/
C
F
Store
AR
RCL
56
4 Select the required Baud rate with <▲> <▼>.
5 Confirm with <RUN/ENTER>. CAL dISP appears on the dis-
play.
Multi 3400i Operation
Displaying the
air pressure
TDS
S
C
1
Baud
Time
Day.Month No.
Year
Ident
Tref20
Tref25
LoBat
6 Select the required display during the pH calibration with
7 Confirm with <RUN/ENTER>. P mbar appears on the display.
The air pressure is only displayed if an oxygen sensor is connected.
Otherwise, "---" appears.
Lin
nLF
<▲> <▼>.
mV: Display of the current electrode voltage
/pH: Display of the buffer nominal value.
TDS
S
n
1
Baud
Time
Day.Month No.
Year
Ident
4
Tref20
Tref25
LoBat
nLF
Lin
pH
A
i
Cal
t
9
Cal
O
L
sd
AutoCal DIN
AutoCal TEC
OUpH
P
4
AutoCal DIN
AutoCal TEC
Sal
mV/pH
%
m
mbar
1/
°
F
p
Auto
ARng
Sal
mV/pH
%
m
mbar
1/
°
F
9
Auto
ARng
/pH
mg/l
S/
cm
M
cm
°
%
C
Store
AR
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
cm
Sal
K
/
RCL
TP
TP
pH calibration interval
8 Confirm with <RUN/ENTER>. Int 3 and the measured variable
pH appear on the display.
TDS
S
n
1
Baud
Time
Day.Month No.
Year
Ident
d
Tref20
Tref25
LoBat
9 Set the required interval in days (d) with <▲> <▼>.
nLF
Lin
pH
t
1
Cal
O
3
8
AutoCal DIN
AutoCal TEC
Sal
mV/pH
%
m
mbar
1/
°
F
7
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
57
Operation Multi 3400i
10 Confirm with <RUN/ENTER>. Int 4 and the measured variable
O
appear on the display.
2
Dissolved oxygen
calibration interval
Conductivity
calibration interval
TDS
UpH Sal
O
1
8
mV/pH
%
m
mbar
1/
°
F
4
Auto
ARng
mV/pH
%
m
mbar
1/
°
F
0
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
cm
Sal
K
/
TP
RCL
TP
RCL
S
t
n
1
Baud
Time
Day.Month No.
Year
Ident
d
Tref20
Tref25
LoBat
11 Set the required interval in days (d) with <▲> <▼>.
12 Confirm with <RUN/ENTER>. Int 5 and the measured variable
Lin
nLF
appear on the display.
TDS
4
1
AutoCal DIN
Cal
AutoCal TEC
O
UpH Sal
S
t
1
Time
Day.Month No.
Year
Tref25
LoBat
nLF
n
Baud
Ident
Lin
d
Tref20
1
Cal
5
AutoCal DIN
AutoCal TEC
Switching over the
reference temperature
58
13 Set the required interval in days (d) with <▲> <▼>.
14 Confirm with <RUN/ENTER>. The reference temperature set
for conductivity measurements appears on the display.
Lin
2
8
Tref20
Cal
pH
OU
5
2
4
AutoCal DIN
AutoCal TEC
Sal
mV
%
m
mbar
1/
°
F
8
Auto
ARng
/pH
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
TP
RCL
S
1
Time
Day.Month No.
Year
Tref25
LoBat
nLF
TDS
t
Baud
Ident
Multi 3400i Operation
15 Using <▲> <▼>, toggle between t20 and t25.
16 Confirm with <RUN/ENTER>.
The date flashes on the display.
Date and time
TDS
S
i
D
1
Baud
Time
Day.Month
17 Set the date of the current day with <▲> <▼>.
18 Confirm with <RUN/ENTER>.
19 Set the current month with <▲> <▼>.
20 Confirm with <RUN/ENTER>.
21 Set the current year with <▲> <▼>.
22 Confirm with <RUN/ENTER>.
No.
Year
Ident
Tref25
LoBat
nLF
The date (month) flashes in the display.
The year appears on the display.
The hours flash on the display.
Lin
0
Tref20
Cal
9
AutoCal DIN
AutoCal TEC
OUpH
s
0
Sal
mV/pH
%
m
mbar
1/
°
F
4
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
Sal
K
/
cm
TP
23 Set the current time with <▲> <▼>.
24 Confirm with <RUN/ENTER>.
The minutes flash on the display.
25 Set the current time with <▲> <▼>.
26 Confirm with <RUN/ENTER>.
The measuring instrument switches to the last active measuring mode.
59
Operation Multi 3400i
4.9 Reset
You can reset (initialize) the measurement parameters and the configuration parameters separately from one another.
Measurement
parameters
pH
O
Cond
The following measuring parameters (pH/O
/Cond InI) can be reset to
2
the default condition:
Measuring mode pH
Asymmetry 0 mV
Slope -59.16 mV
2
Measuring mode D. O. concentration
Relative slope 1.00
Salinity (value) 0.0
Salinity (function) Off
Measuring mode
-1
Cell constant 0.475 cm
(fixed)
Configuration
parameters
Note
The calibration data gets lost when the measuring parameters are reset. Recalibrate after performing a reset.
The following configuration parameters (InI) are reset to the delivery
status:
Baud rate 4800
Display during the
Buffer nominal value
pH calibration
Interval 1
(automatically saved) OFF
Interval 2
(for data transmission) OFF
60
Multi 3400i Operation
Resetting the
measuring parameters
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <CAL> key. The setting to reset the pH measuring
parameters appears on the display.
TDS
S
I
1
Baud
Time
Day.Month No.
Year
Ident
4
Tref20
Tref25
LoBat
3 Using <▲> <▼>, switch between no and YES.
4 Confirm with <RUN/ENTER>.
Lin
nLF
YES: Resetting the pH measuring parameters
no: Retaining settings.
The measuring instrument switches to the setting to reset the
O
measuring parameters.
2
pH
n
Y
Cal
O
I
n
AutoCal DIN
AutoCal TEC
Sal
mV/pH
%
m
mbar
1/
°
F
o
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
TDS
UpH
S
n
I
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
5 Using <▲> <▼>, switch between no and YES.
YES: Resetting the O
no: Retaining settings.
6 Confirm with <RUN/ENTER>. The measuring instrument
switches to the setting to reset the Cond measuring parameters.
Lin
4
Tref20
Cal
Y
AutoCal DIN
AutoCal TEC
O
I
n
Sal
mV/pH
%
m
mbar
1/
°
F
o
Auto
ARng
mg/l
S/
cm
cm
M
Sal
cm
TP
°
K
%
/
C
Store
AR
RCL
measuring parameters.
2
61
Operation Multi 3400i
TDS
S
I
1
Baud
Time
Day.Month No.
Year
Ident
4
Tref20
Tref25
LoBat
7 Using <▲> <▼>, switch between no and YES.
8 Confirm with <RUN/ENTER>.
Lin
nLF
YES: Resetting the Cond measuring parameters.
no: Retaining settings.
The measuring instrument switches to the configuration parameters.
TDS
S
I
1
Baud
Time
Day.Month No.
Year
Ident
4
Tref20
Tref25
LoBat
nLF
Lin
n
Y
Cal
n
Y
Cal
OUpH
I
n
AutoCal DIN
AutoCal TEC
OUpH
I
n
AutoCal DIN
AutoCal TEC
Sal
mV/pH
%
m
mbar
1/
°
F
o
Auto
ARng
Sal
mV/pH
%
m
mbar
1/
°
F
o
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
cm
Sal
K
/
TP
TP
RCL
Resetting the
configuration parame-
ters
9 Using <▲> <▼>, switch between no and YES.
YES: Resetting the configuration parameters
no: Retaining settings.
10 Confirm with <RUN/ENTER>.
The measuring instrument switches to the last active measuring mode.
62
Multi 3400i Maintenance, cleaning, disposal
5 Maintenance, cleaning, disposal
5.1 Maintenance
The measuring instrument is almost maintenance-free.
The only maintenance task is replacing the batteries. LoBat indicates
that the batteries should be changed. The batteries are then largely de-
pleted.
Replacing the batteries
2
1
1 Open the housing after the instrument has been switched off:
– Undo the four screws on the underside of the instrument
– Pull down the lower cover (1).
2 If necessary, take the four depleted batteries (2) out of the bat-
tery compartment.
3 Place four new batteries (type Mignon AA) in the battery com-
partment.
4 Close the lower cover (1).
Warning
Make sure that the poles of the batteries are the right way round.
± signs on the batteries must correspond to the ± signs in the bat-
The
tery compartment. Only use leakproof alkaline manganese batteries.
63
Maintenance, cleaning, disposal Multi 3400i
Note
For maintenance of electrodes, probes and measuring cells refer to the
relevant operating manuals.
5.2 Cleaning
Occasionally wipe the outside of the measuring instrument with a
damp, lint-free cloth. Disinfect the housing with isopropanol as required.
Warning
The housing is made of a synthetic material (ABS). Thus, avoid contact
with acetone and similar detergents that contain solvents. Remove any
splashes immediately.
5.3 Disposal
Packing This measuring instrument is sent out in a protective transport packing.
We recommend: Keep the packing material. The original packing protects the instrument against damage during transport.
Batteries This note refers to the battery regulation that applies in the Federal Re-
public of Germany. We would ask end-consumers in other countries to
follow their local statutory provisions.
Note
This instrument contains batteries. Batteries that have been removed
must only be disposed of at the recycling facility set up for this purpose
or via the retail outlet.
It is illegal to dispose of them in household refuse.
Measuring instrument, Dispose of the measuring instrument as electronic waste at an appro-
priate collection point. It is illegal to dispose of the instrument in household refuse.
64
Multi 3400i What to do if...
6 What to do if...
6.1 pH system messages
Error message 0FL
0FL
0FL0FL
Cause Remedy
pH electrode:
– Not connected – Connect electrode
Error message E3
E3
E3E3
– Air bubble in front of the
– Remove air bubble
diaphragm
– Air in the diaphragm – Extract air or
moisten diaphragm
– Cable broken – Replace electrode
– Gel electrolyte dried out – Replace electrode
Cause Remedy
Electrode
– Diaphragm contaminated – Clean diaphragm
– Membrane contaminated – Clean membrane
– Moisture in the plug – Dry plug
– Electrolyte out of date – Replenish electrolyte or
replace electrode
– Electrode worn out – Replace electrode
– Electrode broken – Replace electrode
Measuring instrument:
– Incorrect calibration procedure – Select correct procedure
– Incorrect solution temperature
– Set up correct temperature
(without temperature sensor)
– Socket damp – Dry socket
65
What to do if... Multi 3400i
Buffer solutions
– Incorrect buffer solutions – Change calibration procedure
– Buffer solutions too old – Use only once.
Note the shelf life
– Buffer solutions depleted – Change solutions
No stable measured
Cause Remedy
value
pH electrode:
– Diaphragm contaminated – Clean diaphragm
– Membrane contaminated – Clean membrane
Obviously incorrect
measured values
Test sample:
– pH value not stable – Measure with air excluded if
necessary
– Temperature not stable – Adjust temperature if
necessary
Electrode + test sample:
– Conductivity too low – Use suitable electrode
– Temperature too high – Use suitable electrode
– Organic liquids – Use suitable electrode
Cause Remedy
pH electrode:
– pH electrode unsuitable – Use suitable electrode
– Temperature difference
between buffer and test
– Adjust temperature of buffers
or sample
sample too high
66
– Measurement procedure not
suitable
– Follow special procedure
Multi 3400i What to do if...
6.2 Oxi system messages
Error message 0FL
Error message E3
0FL
0FL0FL
E3
E3E3
Cause Remedy
Display range exceeded
Oxygen sensor
– Not connected – Connect the probe
– Cable broken – Replace probe
– Depleted – Replace probe
– Short-circuit between gold and
lead electrode
– Clean probe and replace it if
necessary
Cause Remedy
Invalid calibration
Oxygen sensor
– Electrolyte solution depleted – Regenerate probe
– Membrane contaminated – Clean membrane
Error message E7
E7
E7E7
AR flashes
continuously
– Electrode system poisoned – Regenerate probe
– Worn out – Replace probe
– broken – Replace probe
Cause Remedy
Membrane damaged
– Membrane damaged – Regenerate probe
– Membrane head not screwed
– Screw membrane head tight
on tight enough
Cause Remedy
No stable measured value
– Membrane contaminated – Clean membrane
67
What to do if... Multi 3400i
Measured value too low
Measured value too
high
Error message OFL
OFL
OFLOFL
Cause Remedy
– Insufficient flow – Provide flow to the probe
Cause Remedy
– High amount of dissolved
substances
– Air bubbles bump on the
membrane with high velocity
– The carbon dioxide pressure is
– Correct solubility function
using the salinity equivalent
– Avoid direct flow to the
membrane
– Measuring not possible
too high (> 1 bar)
6.3 Conductivity system messages
Cause Remedy
Error message E3
E3
E3E3
The measured value lies outside
the measuring range
– Measuring cell not connected – Connect measuring cell
– Cable broken – Replace measuring cell
Cause Remedy
– Measuring cell contaminated – Clean cell and replace it if
necessary
– Unsuitable calibration
– Check calibration solutions
solution
68
Multi 3400i What to do if...
6.4 General errors
Display LoBat
Instrument does not
react
to keystroke
Display to
to
toto
Cause Remedy
– Batteries almost empty – Exchange the batteries (see
section 5.1 M
AINTENANCE)
Cause Remedy
– Operating condition undefined
or EMC load unallowed
– Processor reset:
Hold the <CAL> key
depressed and switch the
instrument on
Cause Remedy
Probe symbol flashes
Message StoFull
StoFull
StoFullStoFull
– Time-out of the interface – Check that the instrument is
connected
Cause Remedy
– Calibration interval expired – Recalibrate the measuring
system
Cause Remedy
– All memory locations are full – Output data storage and clear
data storage
69
What to do if... Multi 3400i
70
Multi 3400i Technical data
7 Technical data
Dimensions and weight
Mechanical structure
Electrical safety
Ambient
conditions
pH/ORP measuring
ranges
Length [mm] 172
Width [mm] 80
Height [mm] 37
Weight [kg] Approx. 0.3
Type of protection IP 66
Protective class III
Storage - 25 °C ... + 65 °C
Operation -10 °C ... + 55 °C
Climatic class 2
Measuring range Resolution
pH - 2.00 ... + 19.99 0.01
Precision of pH/ORP
(± 1 digit)
Temperature input
U [mV] - 1999 ... + 1999 1
T [°C] - 5.0 ... + 105.0 0.1
pH (± 2 pH units around
± 0.03
the calibration point)
U [mV] ± 1
T [°C] ± 0.1
Manually [°C] - 20 ... + 130
71
Technical data Multi 3400i
Oxi measuring ranges
Measuring range/resolu-
tion temperature
Precision of
Oxi (± 1 digit)
mg/l %
Measuring range I
Resolution
Measuring range II
Resolution
0 ... 19.99
0.01
0 ... 90.0l
0.1
0 ... 199.9
0.1
0 ... 600
1
°C
Measuring range (Resolution) 0 ... 50.0 (0.1)
Concentration ± 0.5 % of measured value
at ambient temperature of 5 °C ... 30 °C
Saturation ± 0.5 % of measured value
when measuring in the range of
± 10 K around the calibration temperature
Temperature
< 2 % at 0 ... 40 °C
compensation
Correction functions of
Oxi
Cond measuring ranges
T [°C] ± 0.1
Salinity correction 0 ... 70.0 SAL
Air pressure correction automatic through built-in
pressure sensor in the range 500 ... 1100
mbar
Measuring range Resolution
[µS/cm] 0 ... 1999 1
[mS/cm] 0.00 ... 19.99
0.0 ... 199.9
0 ... 500
SAL 0.0 ... 70.0 accord-
0.01
0.1
1
0.1
ing to the IOT table
T [°C] − 5.0 ... + 105.0 0.1
72
Multi 3400i Technical data
Precision of
Cond (± 1 digit)
Nonlinear compensation
Accuracy Sample temperature
± 0.5 % 0 °C ... 35 °C
according to EN 27 888;
± 0.5 % 35 °C ... 50 °C
extended nLF function
acc. to
WTW measurements
SAL Range 0.0 ... 42.0
Accuracy Sample temperature
± 0.1 5 °C ... 25 °C
± 0.2 25 °C ... 30 °C
T [°C] ± 0.1
Cell constant,
C [cm-1] 0.450 ... 0.500
calibrating
Cond reference
Tref Can be set to 20 °C or 25 °C
temperature
Serial interface Connection of the cable AK 340/B, AK 325/S
Type RS232, data output
Baud rate Can be set to
1200, 2400, 4800, 9600 Baud
Data bits 8
Stop bits 2
Parity None
Handshake RTS/CTS + Xon/Xoff
Cable length Max. 15m
73
Technical data Multi 3400i
Power supply
Batteries 4 x 1.5 V alkali-manganese batteries, Type
AA
Operational life Approx. 3000 operating hours
Mains The following applies to all plug-in power
supplies:Connection max.
Overvoltage category II
Plug-in power supply unit
(Euro, US , UK, Australian plug)
FRIWO FW7555M/09, 15.1432
Friwo Part. No. 1822089
Input: 100 ... 240 V ~ / 50 ... 60 Hz / 400 mA
Output: 9 V = / 1,5 A
Plug-in power supply with Euro plug:
FRIWO FW1199, 11.7864
Friwo Part. No. 1762613
Input: 230 V ~ / 50 Hz / 5.6 VA
Output: 12 V = / 130 mA / 1.56 VA
Guidelines
and norms used
Plug-in power supply with US plug:
FRIWO FW1199, 11.7880
Friwo Part. No. 1794043
Input: 120 V ~ / 60 Hz / 6 VA
Output: 12 V = / 150 mA
Plug-in power supply with UK plug:
FRIWO FW1199, 11.7872
Friwo Part No. 1816491
Input: 230V ~ / 50 Hz / 5.6 VA
Output: 12 V = / 130 mA / 1.56 VA
EMC E.C. guideline 89/336/EEC
EN 61326-1:1997
EN 61000-3-2 A14:2000
EN 61000-3-3:1995
FCC Class A
Instrument safety E.C. guideline 73/23/EEC
EN 61010-1 A2:1995
Climatic class VDI/VDE 3540
74
IP protection class EN 60529:1991
Multi 3400i 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.
Test certificates
cETLus, CE
75
Technical data Multi 3400i
76
Multi 3400i Lists
8Lists
This chapter provides additional information and orientation aids.
Abbreviations The list of abbreviations explains the indicators and the abbreviations
that appear on the display and in the manual.
Specialist terms The glossary briefly explains the meaning of the specialist terms. How-
ever, 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.
77
Lists Multi 3400i
Abbreviations
Conductivity value (international γ)
AR AutoRead (drift control)
ARng Automatic range switching
Measuring instrument measures with highest resolution
ASY Asymmetry
AutoCal DIN Automatic pH calibration with buffer solutions pre-
pared according to DIN 19 266
AutoCal TEC Automatic pH calibration with WTW technical buff-
er solutions according to DIN 19267
-1
C Cell constant [cm
] (internat. k)
°C Temperature unit, degrees Celsius
Cal Calibration
Cd... Display indicator during calibration for pH mea-
surements. Indicates the selection of the buffer
data record for buffer solutions prepared according
to DIN 19 266
Cm... Display indicator during calibration for pH mea-
surements. Indicates the selection of buffer data
records for buffer solutions of the Merck company
ConCal Conventional single-point or two-point calibration
for pH measurements
Ct... Display indicator during calibration for pH mea-
surements. Indicates the selection of the buffer
data records for WTW technical buffer solutions
E3 Error message
see chapter 6 W
HAT TO DO IF...
InI Initialization
Resets individual basic functions to the status they
had on delivery
78
LoBat Batteries almost empty(Low Battery)
mV Voltage unit
mV/pH Unit of the electrode slope (internat. mV)
Multi 3400i Lists
nLF Nonlinear temperature compensation
OFL Display range exceeded (Overflow)
OxiCal Automatic calibration for D. O. measurements
pH pH value
S Slope (internat. k)
SAL Salinity
SELV Safety Extra Low Voltage
SLO Slope setting on calibration
TC Temperature coefficient (internat. α)
TP Temperature measurement active (temperature
sensor)
25/T25 Reference temperature of 25 °C
T
Ref
U
ASY
Asymmetry
79
Lists Multi 3400i
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.
Asymmetry Designation for the offset potential of a pH electrode. It is the measur-
able potential of a symmetrical electrode, the membrane of which is
immersed in a solution with the pH of the nominal electrode zero point
(WTW electrodes: pH = 7).
AutoRange Name of the automatic selection of the measuring range.
AutoRead WTW name for a function to check the stability of the measured value.
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).
Cell constant, k Characteristic quantity of a conductivity measuring cell, depending on
the geometry.
Conductivity Short form of the expression, specific electrical conductivity. It is a
measured value of the ability of a substance to conduct an electric current. In water analysis, the electrical conductivity is a dimension for the
ionized substances in a solution.
D. O. partial pressure Pressure caused by the oxygen in a gas mixture or liquid.
Diaphragm The junction is a porous body in the housing wall of reference elec-
trodes or electrolyte bridges. It forms the electrical contact between
two solutions and makes electrolyte exchange more difficult. The expression, junction, is also used for ground or junction-less transitions.
Electrode zero point The zero point of a pH electrode is the pH value at which the electro-
motive force of the pH electrode at a specified temperature is zero.
Normally, this is at 25 °C.
Electromotive force of
an electrode
The electromotive force U of the electrode is the measurable electromotive force of an electrode in a solution. It equals the sum of all the
galvanic voltages of the electrode. Its dependency on the pH results
in the electrode function which is characterized by the parameters,
slope and zero point.
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).
80
Multi 3400i Lists
Measuring system The measuring system comprises all the devices used for measuring,
e. g. measuring instrument and probe. In addition, there is the cable
and possibly an amplifier, terminal strip and armature.
Molality Molality is the quantity (in Mol) of a dissolved substance in 1000 g sol-
vent.
MultiCal
®
WTW name stating that a measuring instrument provides several cal-
ibration procedures.
Offset potential The measurable potential of a symmetrical electrode, the membrane
of which is immersed in a solution with the pH of the nominal electrode
zero point. The asymmetry is part of the offset potential.
ORP voltage The ORP is caused by oxidizing or reducing substances dissolved in
water if these substances become effective on an electrode surface
(e. g. a gold or platinum surface).
OxiCal
®
WTW name for a procedure to calibrate D. O. measuring systems in
water vapor saturated air.
Oxygen saturation Short name for the relative D. O. saturation.
Note: The D. O. saturation value of air-saturated water and the D. O.
saturation value of oxygen-saturated water are different.
pH value The pH is a measure of the acidic or basic effect of an aqueous solu-
tion. It corresponds to the negative decadic logarithm of the molal hy-
drogen ions activity divided by the unit of the molality. The practical pH
value is the value of a pH measurement.
Potentiometry Name of a measuring technique. The signal (depending on the mea-
sured parameter) of the electrode is the electrical potential. The elec-
trical current remains constant.
Reference
temperature
Fixed temperature value to compare temperature-dependent mea-
sured values. For conductivity measurements, the measured value is
converted to a conductivity value at a reference temperature of 20 °C
or 25 °C.
Reset Restoring the original condition of all settings of a measuring system.
Resistance Short name for the specific electrolytic resistance. It corresponds to
the reciprocal value of the electrical conductivity.
Resolution Smallest difference between two measured values that can be dis-
played by a measuring instrument.
Salinity The absolute salinity S
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 is used for oceanographic monitoring. It is deter-
mined by measuring the electrical conductivity.
of seawater corresponds to the relationship
A
81
Lists Multi 3400i
Salt content General designation for the quantity of salt dissolved in water.
Sample Designation of the 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.
Setting the
temperature
compensation
Name of a function that considers the temperature influence on the
measurement and converts it accordingly. Depending on the measured parameter to be determined, the temperature compensation
functions in different ways. For conductimetric measurements, the
measured value is converted to a defined reference temperature. For
potentiometric measurements, the slope value is adjusted to the temperature of the test sample but the measured value is not converted.
Slope The slope of a linear calibration function.
Slope (relative) Designation used by WTW in the D. O. measuring technique. It ex-
presses the relationship of the slope value to the value of a theoretical
reference probe of the same type of construction.
Standard solution The standard solution is a solution where the measured value is
known by definition. It is used to calibrate a measuring system.
TDS Total dissolved solids
Temperature
Value of the slope of a linear temperature function.
coefficient
Temperature function Name of a mathematical function expressing the temperature behav-
ior of a test sample, a probe or part of a probe.
82
Multi 3400i Index
Index
A
Air pressure display 57
Asymmetry 20
Authorized use 11
AutoCal TEC 20, 22
AutoRange (oxygen) 15
AutoRead
Conductivity
D. O. 29
pH 18
37
C
Calibration
Conductivity
D. O. 30
pH 20
Calibration evaluation
D. O.
31
Dissolved oxygen 31
Calibration interval 41
conductivity 58
Dissolved oxygen 58
pH 57
Calibration protocol 20
conductivity 38
D. O. 30
Cell constant 35, 38
Conductivity calibration
evaluation
Configuration parameters 60
Connecting a printer 55
38
39
D
D. O.
Measuring the concentra-
tion
27
Measuring the saturation
28
Data record 42
Default condition 60
Display 9
Drift control
Conductivity
D. O
29
pH 18
37
E
Energy saving feature 15
Error messages 67, 68
I
Initial commissioning 13
Initialization 60
Interval
Calibration (Int 3)
save 44
41
J
Jack field 9
K
Keys 8
M
Measuring 34
conductivity 36
D. O. concentration 27
D. O. saturation 28
ORP voltage 19
pH value 18
Salinity 36
Measuring mode when
switching on
Measuring ranges
Conductivity
oxygen 72
pH/ORP 71
Measuring ranges with
DurOx
Measuring the conductivity
15
72
72
36
Measuring the salinity 36
O
Operating 10
Operating safety 12
ORP electrode 19
ORP voltage 19
Oxygen
Measurement range sel-
ection
15
P
pH calibration evaluation 21
pH value 18
Plug-in power supply 14
Precautions 11
R
Reference temperature
(conductivity)
Remote control 55
Replacing the batteries 63
Reset 60
Resetting the measuring
parameters
RS232 interface 55
RS232 socket assignment
34
61
55
S
Safety 11
Salt content correction
entering the salinity
switching on 27
Save interval 44
Saving data 42
Scope of delivery 13
Setting the baud rate 56
Setting the date 13, 59
Setting the reference
temperature
Setting the time 13, 59
Single-point calibration (pH)
58
33
20, 23
Slope 20, 30
T
Temperature compensation
(conductivity)
Temperature probe
Conductivity
Temperature sensor
D. O.
pH 17
Transmitting data 53
Transmitting measured
34
34
26
83
Index Multi 3400i
values 53
Two-point calibration (pH)
20, 23
84
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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