wtw 2F30-100 User manual

Accuracy when
going to press
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. Al-
so, we cannot guarantee that there are absolutely no errors in this man-
ual. Therefore, we are sure you will understand that we cannot accept
any legal claims resulting from the data, figures or descriptions.
Warranty We guarantee the instrument described for 3 years from the date of
purchase.
The instrument warranty covers manufacturing faults that are discov-
ered within the warranty period. The warranty does not cover compo-
nents 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 han-
dling or unauthorized opening of the instrument invalidates any warran-
ty 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 2004, WTW GmbH
Reproduction in whole - or even in part - is prohibited without the ex-
press written permission of WTW GmbH, Weilheim.
Printed in Germany.

Multi 340i List of contents
3
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

List of contents Multi 340i
4
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

Multi 340i Overview
5
1 Overview
1.1 General features
The compact precision handheld meter Multi 340i enables you to carry
out pH measurements, dissolved oxygen (D. O.) measurements and
conductivity measurements quickly and reliably.
The Multi 340i handheld meter provides the maximum degree of oper-
ating comfort, reliability and measuring certainty for all applications.
The proven MultiCal®and OxiCal®calibration procedures and the pro-
cedures to determine/set up the cell constant support you in your work
with the meter. The special AutoRead function enables precise mea-
surements.
Note
If you need further information or application notes, you can obtain the
following material from WTW:
Application reports
Primers
Safety datasheets.
You will find information on available literature in the WTW catalog or
via the Internet.
1Keypad
2Display
3Jack field
AR
RCL
STO
CAL
M
O
6
7
1
92
7
O
°
C
mg/l
ARng
TP
1
2
3

Overview Multi 340i
6
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.
Set (sample configuration):
1Multi 340i meter, carrying strap with 2 carrying clips, armoring
2Cond/Oxi beaker with beaker clip
3pH beaker
4Stand
5Plastic beaker
6Storing solution for pH electrodes
1
2
4
5
11
10
9
12
13
14
15
16
17
18
19
8
7
6
5
4
3

Multi 340i Overview
7
750 ml pH buffer solution, STP 4
850 ml pH buffer solution, STP 7
9Calibration 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

Overview Multi 340i
8
1.3 Keypad
Key functions
RUN/ENTER
ARRCLCAL
STOM
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
<>
Confirm entries, start AutoRead,
output measured values
<RUN ENTER>
M
STO
CAL
RCL
AR
RUN/ENTER

Multi 340i Overview
9
1.4 Display
1.5 Jack field
1D. O. probe or conductivity measuring cell
2pH electrode
3pH temperature sensor
4Plug-in power supply unit
5RS232 serial interface
ARng
Tref20 AutoCal DIN
Lin
TDS
cm
M
°
F
/
K
%
Time
Baud
Day.Month No.
Ident
Year
8
8 .
8
88
8
°
C
%
mg/l
TP
1
mV/pH
UpH SalO
S
Tref25
nLF AutoCal TEC
RCL
Auto
Store
LoBat Cal
AR
1/
cm
Sal
mbar
S/
m
cm
Status display
Meas. value display
Function and
temperature display
Sensor symbol
5
1 2 3
4

Overview Multi 340i
10
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.

Multi 340i Safety
11
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the measur-
ing 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 ex-
perience, 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 envi-
ronment.
Further notes
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating manu-
als.
2.1 Authorized use
The authorized use of the measuring instrument consists exclusively of
the:
pH and ORP measurement
measurement of the oxygen content and
measurement of the conductivity, salinity and temperature
in the field and laboratory.
The technical specifications as given in chapter 7 TECHNICAL DATA must
be observed. Only the operation and running of the measuring instru-
ment according to the instructions given in this operating manual is au-
thorized. Any other use is considered to be unauthorized.

Safety Multi 340i
12
2.2 General safety instructions
This instrument is built and inspected according to the relevant guide-
lines and norms for electronic measuring instruments (see chapter 7
TECHNICAL DATA).
It left the factory in a safe and secure technical condition.
Function and operating
safety
The smooth functioning and operational safety of the measuring instru-
ment can only be guaranteed if the generally applicable safety mea-
sures and the specific safety instructions in this operating manual are
followed during operation.
The smooth functioning and operational safety of the measuring instru-
ment can only be guaranteed under the environmental conditions that
are in specified in chapter 7 TECHNICAL DATA.
If the instrument was transported from a cold environment to a warm
environment, the formation of condensate can lead to the faulty func-
tioning of the instrument. In this event, wait until the temperature of the
instrument reaches room temperature before putting the instrument
back into operation.
Safe operation If safe operation is no longer possible, the instrument must be taken out
of service and secured against inadvertent operation!
Safe operation is no longer possible if the measuring instrument:
has been damaged in transport
has been stored under adverse conditions for a lengthy period of
time
is visibly damaged
no longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the instrument.
Obligations of the pur-
chaser
The purchaser of the measuring instrument must ensure that the fol-
lowing laws and guidelines are observed when using dangerous sub-
stances:
EEC directives for protective labor legislation
National protective labor legislation
Safety regulations
Safety datasheets of the chemical manufacturers.

Multi 340i Commissioning
13
3 Commissioning
3.1 Scope of delivery
Multi 340i handheld meter
Plug-in power supply unit
Operating manual and short operating manual
4 batteries, 1.5 V Mignon type AA (in the instrument)
For details of scope of delivery of SETs, see section 1.2 SETS OF
EQUIPMENT and WTW catalog.
3.2 Initial commissioning
Perform the following activities:
Set the date and time
Connect the plug-in power supply (optional)
Setting the date and
time 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.
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 <▲> < >.

Commissioning Multi 340i
14
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 mea-
suring 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 TECHNICAL DA-
TA).
Warning
Use original plug-in power supplies only (see
chapter 7 TECHNICAL DATA).
13 Confirm with <RUN/ENTER>.
The instrument switches to a measuring mode.
14 Switch the instrument off using <ON/OFF>.
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.
2
1
3

Multi 340i Operation
15
4 Operation
4.1 Switching on the measuring instrument
Measuring mode when
switching on
Note
The measuring instrument has an energy saving feature to avoid un-
necessary 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
if the power is supplied by the plug-in power supply,
if the AutoStore function is active,
if the communication cable and a PC with a running communication
program are connected,
if the printer cable is connected (for external printers).
AutoRange measure-
ment 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 measur-
ing 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 TECHNICAL DATA.
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.
Connected sensor Measuring mode
No sensor or pH/ORP electrode pH or ORP measurement (de-
pending on the last selected set-
ting)
D. O. probe or conductivity mea-
suring cell
Last selected measuring mode
2 sensors of any type Last selected measuring mode

Operation Multi 340i
16
4.2 pH value / ORP voltage
4.2.1 General information
Preparatory activities Perform the following preparatory activities when you want to measure:
Note
Incorrect calibration of pH electrodes leads to incorrect measured val-
ues. Calibrate regularly before measuring. You can only connect elec-
trodes of the NTC30 type or without temperature sensor.
Warning
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result. The RS232
interface is not galvanically isolated.
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.
4 Using <▲> < >, toggle between the pH or mV measuring
modes.

Multi 340i Operation
17
Temperature measure-
ment in pH measure-
ments
You can perform pH measurements with or without a temperature sen-
sor 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.
* 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 solu-
tion manually using the <▲> < >keys while keeping the <RUN/EN-
TER> key depressed.
Temperature sensor Display Mode
pH Cond or
Oxi
yes - TP Automatic with
pH temperature sensor
yes yes TP
- - Manual
- yes TP
flashes
The temperature value of the
second probe (Cond or Oxi) in
the same sample is taken
over for the pH measurement*

Operation Multi 340i
18
4.2.2 Measuring the pH value
AutoRead AR
(Drift control)
The AutoRead function (drift control) checks the stability of the mea-
surement signal. The stability has a considerable impact on the repro-
ducibility of the measured values.
For identical measurement conditions, the following criteria apply:
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.
4 When measuring without a connected temperature sensor:
Options:
Determine the current temperature using a thermometer
and, while keeping the <RUN/ENTER> key depressed, en-
ter this temperature value with <▲> < >.
TP display indicator not displayed, socket for the second
probe is free:
Connect the second probe (Oxi or Cond) and immerse it in
the same sample. TP flashes, the temperature is automati-
cally measured using the second probe.
Tref20
Lin Cal
8
1
S
SalOU
%
mg/l
mV/pH
1/
cm
Sal
AutoCal DIN
Tref25
nLF AutoCal TEC
RCL
Auto
Store
LoBat
ARng AR
Time
Baud
Day.Month No.
Ident
Year
mbar
TDS
cm
M
°
F
/
K
%
S/
m
cm
8
4
2
99
6
°
C
TP
pH
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 340i Operation
19
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.
Note
ORP electrodes are not calibrated. However, you can check ORP elec-
trodes using a test solution.
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.
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 Ustatus display appears.
The ORP voltage (mV) of the sample appears on the display.
4 Wait for a stable measured value.
/pH
Tref20
Cal
8
TDS
S
8
1
pH SalO
%
mg/l
1/
cm
Sal
AutoCal DIN
Lin
Tref25
nLF AutoCal TEC
RCL
Auto
Store
LoBat
ARng AR
Time
Baud
Day.Month No.
Ident
Year
mbar cm
M
°
F
/
K
%
S/
m
cm
8
4
2
23
°
C
TP
U
mV

Operation Multi 340i
20
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 dis-
played. Calibration determines the current values of the asymmetry
and slope of the electrode and stores them in the measuring instru-
ment. Thus, you should calibrate at regular intervals.
When to calibrate? After connecting another electrode
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 CONFIGURATION), 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 cor-
responds to a single-point calibration. To do this, the instrument uses
the Nernst slope (-59.2 mV/pH at 25 °C) and determines the asymme-
try of the electrode.
AutoRead The calibration procedure automatically activates the AutoRead func-
tion.
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
Displaying the calibra-
tion data
You can view the data of the last calibration on the display. The pro-
ceeding is described on page 48.
Printing the
calibration protocol
The calibration record contains the calibration data of the current cali-
bration. You can transmit the calibration protocol to a printer via the se-
rial interface (see OUTPUTTING THE CALIBRATION PROTOCOL ON THE
INTERFACE, 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 be-
fore calibrating. After a valid calibration, the record is printed.