wtw Multi 350i User manual

ba75420e04 03/2005
Multi 350i
Operating manual
ESC
STO
PRT
CAL
M
O
pH / ISE / DO / conductivity measuring instrument
For Sales & Service Contact
2650 E. 40th Ave. • Denver, CO 80205
Phone [phone] • Fax [phone]
1-800-833-7958
www.geotechenv.com

Accuracy when
going to press
The use of advanced technology and the high quality standard of our
instruments are the result of a continuous development. This may
result in differences between this operating manual and your
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.
Currentness of firmware The process of consistently improving our products includes the
continuous further development of instrument firmware. The current
Multi 350i firmware is available on the Internet. It can easily be
downloaded on your meter using the enclosed AK 340/B cable and a
PC. For more detailed information, refer to the appendix of this
operating manual or to the Internet under http://www.WTW.com.
Copyright ©Weilheim 2005, WTW GmbH
Reproduction in whole - or even in part - is prohibited without the
express written permission of WTW GmbH, Weilheim.
Printed in Germany.

Multi 350i Contents
1
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 SETs of equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.5 Socket field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 10
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Switching on the measuring instrument . . . . . . . . . . . . . 13
4.2 General operating principles . . . . . . . . . . . . . . . . . . . . . 14
4.2.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.2 Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2.3 Example 1 on navigation: Setting the language 17
4.2.4 Example 2 on navigation: Setting the date and
time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3 System settings (system menu) . . . . . . . . . . . . . . . . . . . 21
4.3.1 Data storage . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3.3 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.4 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 25
4.4.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 27
4.4.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 28
4.4.4 Settings for pH and ORP measurements . . . . . 29
4.4.5 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.4.6 Carrying out the TEC and NIST/DIN calibration 34
4.4.7 Carrying out a ConCal calibration . . . . . . . . . . . 38
4.5 Ion concentration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.5.1 General information . . . . . . . . . . . . . . . . . . . . . . 41
4.5.2 Measuring the ion concentration . . . . . . . . . . . . 42
4.5.3 Settings for ISE measurements . . . . . . . . . . . . 43
4.5.4 Calibrating for ISE measurements . . . . . . . . . . 43
4.6 Dissolved oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
4.6.1 General information . . . . . . . . . . . . . . . . . . . . . . 49
4.6.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
4.6.3 Settings for DO sensors . . . . . . . . . . . . . . . . . . 51
4.6.4 DO calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Contents Multi 350i
2
4.7 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
4.7.1 General information . . . . . . . . . . . . . . . . . . . . . . 58
4.7.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.7.3 Temperature compensation . . . . . . . . . . . . . . . . 60
4.7.4 Settings for conductivity measuring cells . . . . . . 61
4.7.5 Determining the cell constant (calibration in the
control standard) . . . . . . . . . . . . . . . . . . . . . . . . 63
4.8 Data storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
4.8.1 Manual data storage . . . . . . . . . . . . . . . . . . . . . 67
4.8.2 Automatic data storage at intervals . . . . . . . . . . 68
4.8.3 Editing the measured value storage . . . . . . . . . 70
4.8.4 Erasing the measured value storage . . . . . . . . . 73
4.8.5 Displaying and outputting calibration records . . 74
4.9 Transmitting data (RS 232 interface) . . . . . . . . . . . . . . . 76
4.9.1 Options for data transmission . . . . . . . . . . . . . . 76
4.9.2 Connecting a PC/external printer . . . . . . . . . . . . 77
4.9.3 Operation with MultiLab pilot . . . . . . . . . . . . . . . 77
4.10 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
4.10.1 Resetting the sensor settings . . . . . . . . . . . . . . 78
4.10.2 Resetting the system settings . . . . . . . . . . . . . . 79
5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 81
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
6.1 pH and ORP measurement . . . . . . . . . . . . . . . . . . . . . . 83
6.2 ISE measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
6.3 DO measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
6.4 Conductivity measurement . . . . . . . . . . . . . . . . . . . . . . . 87
6.5 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
7.2 Measuring ranges, resolution, accuracy . . . . . . . . . . . . . 91
7.2.1 pH/ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
7.2.2 ISE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
7.2.3 Dissolved oxygen . . . . . . . . . . . . . . . . . . . . . . . . 92
7.2.4 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
9 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Appendix: Firmware Update . . . . . . . . . . . . . . . . . . . . . . . 103

Multi 350i Overview
3
1Overview
1.1 General features
The Multi 350i compact precision handheld meter enables you to carry
out pH measurements, ISE measurements, dissolved oxygen (DO)
measurements and conductivity measurements quickly and reliably.
The Multi 350i 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
3Socket field
ESC
STO
PRT
CAL
M
O
1
2
3

Overview Multi 350i
4
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.
1
2
4
5
11
10
9
12
13
14
15
16
17
18
19
8
7
6
5
4
3

Multi 350i Overview
5
Set (sample configuration):
1Multi 350i measuring instrument, carrying strap with 2 carrying
clips, armoring
2Cond/Oxi beaker with beaker clip
3pH beaker
4Stand
5Plastic beaker, 50 ml
6Storing solution for pH electrodes
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 DO sensors
11 50 ml RL/G cleaning solution for DO sensors
12 Exchange membrane caps for DO sensors (3 pieces)
13 SF 300 polishing strip for the maintenance of DO sensors
14 Conductivity measuring cell
15 pH combination electrode
16 DO sensor
17 Operating manual + short operating manual
18 Equipment case
19 Plug-in power supply unit
MultiLab pilot CD-ROM

Overview Multi 350i
6
1.3 Keypad
Key functions
MENU
ENTER
ESCSTOCAL
PRTM
Select the measured variable <M>:
–pH value / ORP / ion concentration
–DO concentration / DO saturation / DO partial
pressure
–Conductivity / specific resistance / salinity /
TDS
Output display contents to RS232 interface (e.g.
print)
<PRT>
Switch the measuring instrument on/off
<ON/OFF>
Calibrate the currently selected measured vari-
able
<CAL>
Store a measured value
<STO>
Switch to the next higher menu level /
cancel input
<ESC>
Set values
<▲>, <▼>
Open a menu / confirm input
<MENU/ENTER>
M
PRT
CAL
STO
ESC
MENU
ENTER

Multi 350i Overview
7
1.4 Display
The graphical display can indicate up to three measuring windows at
the same time. The illumination enables to read the display even in the
darkness. You can modify the display to meet your requirements in
multiple ways.
1.5 Socket field
1DO sensor or conductivity measuring cell or combined con-
ductivity / DO sensor
2pH electrode or ISE combination electrode
3pH temperature sensor
4Plug-in power supply unit
5RS232 serial interface
pH
6.949
24.0 °C
O
2
7.29 mg/l
24.0 °C
[SAL]
731 µS/cm
24.0 °C
[nLF][Tr25]
05.09.03 09:25
Measured variable
Measured value (with unit)
Temperature display
Sensor symbol
Status line
5
123
4

Overview Multi 350i
8

Multi 350i Safety
9
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 before working with the measuring system. The op-
erating manual must always be available within the vicinity of the mea-
suring 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:
Caution
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 manu-
als.
2.1 Authorized use
The authorized use of the measuring instrument consists exclusively of
the:
!pH and ORP measurement
!ISE measurement
!measurement of dissolved oxygen (DO) and
!conductivity measurement
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 350i
10
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
7T
ECHNICAL 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 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
purchaser
The purchaser of this 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 350i Commissioning
11
3 Commissioning
3.1 Scope of delivery
!Multi 350i handheld measuring instrument with 4 rechargeable bat-
teries, 1.2 V type AA in the instrument
!Plug-in power supply with Euro plug,
exchange plugs for USA, UK, and Australia are enclosed
!Operating manual and short operating manual
!MultiLab pilot CD-ROM
3.2 Power supply
Mains operation and
charging the batteries
You can operate the measuring instrument either with the built-in re-
chargeable batteries or with the plug-in power supply. The plug-in pow-
er supply supplies the measuring instrument with low voltage (9 V DC).
At the same time, the rechargeable batteries are charged. The batter-
ies are charged even when the instrument is switched off.
Charging time of the
batteries
approx. 36 hours. The LoBat display indicator appears when the batter-
ies are nearly empty and have to be charged as soon as possible.
Caution
The line voltage at the operating site must lie within the input
voltage range of the original plug-in power supply (see chapter
7T
ECHNICAL DATA).
Caution
Use original plug-in power supplies only (see
chapter 7 TECHNICAL DATA).
Note
The batteries should not be completely discharged. If you do not oper-
ate the instrument for a longer period of time you should charge the bat-
teries every six months.
Automatic switchoff The instrument has an automatic switchoff function in order to save the
batteries (see section 4.3.3).
Display illumination
with battery operation
During battery operation, the measuring instrument automatically
switches off the display illumination if no key has been pressed for
15 seconds. The illumination is switched on with the next keystroke
again. The display illumination can be switched off completely.

Commissioning Multi 350i
12
3.3 Initial commissioning
Perform the following activities:
!For mains operation and charging the batteries: Connect the plug-in
power supply unit (see section 3.2 POWER SUPPLY).
!Switch on the measuring instrument (see section 4.1)
!Set the language (see section 4.2.3)
!Set the date and time (see section 4.2.4)
Note
When you set the language, date and time according to the mentioned
sections of this operating manual you will quickly be familiar with the
simple operation of the Multi 350i.
1If necessary, replace the Euro plug (1) on the plug-in power
supply unit (2) by the country-specific plug suitable for your
country.
2 Connect the plug (3) to the socket (4) of the measuring instru-
ment.
3Connect the plug-in power supply unit to an easily accessible
mains socket.
4
3
1
2

Multi 350i Operation
13
4 Operation
4.1 Switching on the measuring instrument
Switching on Press the <ON/OFF> key.
The measured value display appears.
Switching off Press the <ON/OFF> key.
Automatic switchoff The instrument has an automatic switchoff function in order to save the
batteries (see section 4.3.3). The automatic switchoff switches off the
measuring instrument if no key is pressed for an adjustable period.
The automatic switchoff is not active
!if the power is supplied by the plug-in power supply unit,
!if the Automatic data storage function is active, or with automatic
data transmission
!if the communication cable and a PC with a running communication
program are connected,
!if the printer cable is connected (for external printers).
Display illumination
with battery operation
During battery operation, the measuring instrument automatically
switches off the display illumination if no key has been pressed for
15 seconds. The illumination is switched on with the next keystroke
again.
pH
6.949
25.0 °C

Operation Multi 350i
14
4.2 General operating principles
This section contains basic information of the operation of the
Multi 350i.
Operating elements,
display
An overview of the operating elements and the display is given in
section 1.3 and section 1.4.
Operating modes,
navigation
An overview of the operating modes and navigation of the Multi 350i is
given in section 4.2.1 and section 4.2.2.
4.2.1 Operating modes
The instrument has the following operating modes:
!Measuring
The measuring data of one to three sensors is displayed in the
measured value display
!Calibration
The course of a calibration with calibration information, functions
and settings is displayed
!Data storage
The measuring instrument stores measuring data automatically or
manually
!Transmitting data
The measuring instrument transmits measuring data and calibration
records to the serial interface automatically or manually.
!Setting
The system menu or a sensor menu with submenus, settings and
functions is displayed

Multi 350i Operation
15
4.2.2 Navigation
Measured value display In the measured value display, you can
!select a measuring window with <▲><▼>and
open the relevant measuring menu by shortly pressing
<MENU/ENTER>.
!open the system menu with the sensor-independent settings by
pressing <MENU/ENTER> for a long time (approx. 1 s).
!change the display in the selected measuring window
(e. g. pH < − > mV) by pressing <M>.
Menus and dialogs The menus for settings and dialogs in courses contain further sub-
menus. The selection is made with the <▲><▼>keys. The current se-
lection is displayed in reverse video.
!Submenus
The name of the submenu is displayed at the upper edge of the
frame. Submenus are opened by confirming with <MENU/ENTER>.
Example:
!Settings
Settings are indicated by a colon. The current setting is displayed on
the right-hand side. The setting mode is opened with
<MENU/ENTER>. Subsequently, the setting can be changed with
<▲><▼>and <MENU/ENTER>.
Example:
General
Interface
Clock function
Reset
System
Language:Deutsch
Beep:Off
Illumination:On
Contrast:48 %
Temperature unit:°C
Switchoff time:30 min
System

Operation Multi 350i
16
!Functions
Functions are designated by the name of the function. They are im-
mediately carried out by confirming with <MENU/ENTER>.
Example: Display the Calibration record function.
Messages Information or operating instructions are designated by the isymbol.
They cannot be selected.
Example:
Note
The principles of navigation are explained in the two following sections
by reference of examples:
!Set the language (see section 4.2.3)
!Set the date and time (see section 4.2.4).
Calibration type:TEC
Calibration interval:7 d
Unit for slope:mV/pH
Calibration record
:
i2.00 4.01 7.00 10.01
pH
iBuffer recognition TEC
iImmerse sensor in buffer 1
Set temperature: 25 °C
Continue
pH

Multi 350i Operation
17
4.2.3 Example 1 on navigation: Setting the language
1Press the <ON/OFF> key.
The measured value display appears.
The instrument is in the measuring ode.
2Open the system menu by pressing <MENU/ENTER> for a
long time (approx. 1 s).
The instrument is in the setting mode.
3Select the System submenu with <▲><▼>.
The current selection is displayed in reverse video.
4 Open the System submenu with <MENU/ENTER>.
5Select the General submenu with <▲><▼>.
The current selection is displayed in reverse video.
pH
7.00
25.0 °C
Data storage
Display
System
Storage & config
General
Interface
Clock function
Reset
System

Operation Multi 350i
18
6 Open the General submenu with <MENU/ENTER>.
7Open the setting mode for the Language with
<MENU/ENTER>.
8Select the required language with <▲><▼>.
9 Confirm the setting with <MENU/ENTER>.
The setting becomes active the next time the system menu is
called up.
10 To make further settings, switch to the next higher menu level
with <ESC>.
or
Switch to the measured value display with <M>.
The instrument is in the measuring ode.
Language:Deutsch
Beep:Off
Illumination:On
Contrast:48 %
Temperature unit:°C
Switchoff time:30 min
System
Language:Deutsch
Beep:Off
Illumination:On
Contrast:48 %
Temperature unit:°C
Switchoff time:30 min
System