Xylem WTW pH/Cond 3320 User manual

OPERATING MANUAL
ba77054d01 02/2014
pH/Cond 3320
METER FOR 2 SENSORS (PH/ORP/COND)
25.0
6.093
pH
°C
USB output
15.11.2008
08:37
3320

2ba77054d01 02/2014
pH/Cond 3320
Copyright © Weilheim 2014, WTW GmbH
Reproduction in whole - or even in part - is prohibited without the
express written permission of WTW GmbH, Weilheim.
Printed in Germany..
For the most recent version of the manual, please visit
www.WTW.com.

pH/Cond 3320 Contents
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pH/Cond 3320 - Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 pH/Cond 3320 meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1 Safety information in the operating manual . . . . . 7
2.1.2 Safety signs on the meter . . . . . . . . . . . . . . . . . . 7
2.1.3 Further documents providing safety information . 7
2.2 Safe operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.2 Requirements for safe operation . . . . . . . . . . . . . 8
2.2.3 Unauthorized use . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Scope of delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Power supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3.1 Inserting the batteries. . . . . . . . . . . . . . . . . . . . . 10
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 General operating principles . . . . . . . . . . . . . . . . . . . . . . 11
4.1.1 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1.3 Status information (meter) . . . . . . . . . . . . . . . . . 12
4.1.4 Socket field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 Switching on the meter . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Switching off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4.2 Measured value display . . . . . . . . . . . . . . . . . . . 15
4.4.3 Menus and dialogs . . . . . . . . . . . . . . . . . . . . . . . 15
4.4.4 Elements in menus and dialogs . . . . . . . . . . . . . 15
4.4.5 Example 1 on navigation: Setting the language. 16
4.4.6 Example 2 on navigation: Setting the date and time
18
4.5 Channel display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5.1 Display of several sensors in the measuring
mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5 pH value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Contents pH/Cond 3320
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5.1 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.1.1 Measuring the pH value . . . . . . . . . . . . . . . . . . . 21
5.1.2 Measuring the temperature. . . . . . . . . . . . . . . . . 23
5.2 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.2.1 Why calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.2.2 When do you have to calibrate? . . . . . . . . . . . . . 24
5.2.3 Automatic calibration (AutoCal) . . . . . . . . . . . . . 24
5.2.4 Manual calibration (ConCal) . . . . . . . . . . . . . . . . 27
5.2.5 Calibration points . . . . . . . . . . . . . . . . . . . . . . . . 30
5.2.6 Calibration data. . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.2.7 Continuous measurement control (CMC
function) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6 ORP voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.1 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.1.1 Measuring the ORP . . . . . . . . . . . . . . . . . . . . . . 35
6.1.2 Measuring the temperature. . . . . . . . . . . . . . . . . 37
6.2 ORP calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.1 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.1.1 Measuring the conductivity . . . . . . . . . . . . . . . . . 38
7.1.2 Measuring the temperature. . . . . . . . . . . . . . . . . 40
7.2 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
7.2.1 Why calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . 40
7.2.2 When to calibrate? . . . . . . . . . . . . . . . . . . . . . . . 40
7.2.3 Determining the cell constant (calibration in control
standard) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
7.2.4 Calibration data. . . . . . . . . . . . . . . . . . . . . . . . . . 41
8 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
8.1 Measurement settings . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
8.1.1 Settings for pH measurements . . . . . . . . . . . . . . 44
8.1.2 Buffer sets for calibration . . . . . . . . . . . . . . . . . . 45
8.1.3 Calibration interval . . . . . . . . . . . . . . . . . . . . . . . 47
8.1.4 Settings for ORP measurements . . . . . . . . . . . . 48
8.1.5 Settings for conductivity measuring cells . . . . . . 49
8.1.6 Calibration interval . . . . . . . . . . . . . . . . . . . . . . . 51
8.1.7 Temperature compensation . . . . . . . . . . . . . . . . 51
8.1.8 Setting the TDS factor . . . . . . . . . . . . . . . . . . . . 52
8.2 Sensor-independent settings . . . . . . . . . . . . . . . . . . . . . . 53
8.2.1 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.2.2 Data storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.3 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.3.1 Resetting the measurement settings . . . . . . . . . 54
8.3.2 Resetting the system settings. . . . . . . . . . . . . . . 55

pH/Cond 3320 Contents
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9 Data storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
9.1 Manual storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
9.2 Automatic data storage at intervals . . . . . . . . . . . . . . 58
9.3 Measurement data storage . . . . . . . . . . . . . . . . . . . . . . . 60
9.3.1 Editing the measured value storage. . . . . . . . . . 60
9.3.2 Erasing the measurement data storage . . . . . . . 62
9.3.3 Measurement dataset . . . . . . . . . . . . . . . . . . . . 62
9.3.4 Storage locations . . . . . . . . . . . . . . . . . . . . . . . . 62
10 Transmitting data (USB interface). . . . . . . . . . . . . . . . 63
10.1 Options for data transmission . . . . . . . . . . . . . . . . . . . . . 63
10.2 Connecting a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
10.3 MultiLab Importer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
11 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 65
11.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
11.1.1 General maintenance activities . . . . . . . . . . . . . 65
11.1.2 Replacing the batteries . . . . . . . . . . . . . . . . . . . 65
11.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
11.3 Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
11.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
12 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
12.1 pH/ORP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
12.2 Conductivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
12.3 General information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
13 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
13.1 Measuring ranges, resolution, accuracy . . . . . . . . . . . . . 71
13.1.1 pH/ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
13.1.2 Cond . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
13.2 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
14 Firmware update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
15 Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
16 Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Overview pH/Cond 3320
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1 Overview
1.1 pH/Cond 3320 meter
The pH/Cond 3320 meter enables you to perform measurements (pH, U, ISE,
conductivity) quickly and reliably.
The pH/Cond 3320 provides the maximum degree of operating comfort, reli-
ability and measuring certainty for all applications.
1.2 Sensors
A measuring system ready to measure consists of the pH/Cond 3320 meter
and a suitable sensor.
Suitable sensors are pH electrodes, ion selective electrodes (ISE), ORP elec-
trodes and conductivity measuring cells.
1 Keypad
2 Display
3 Socket field
Information on available sensors is given on the Internet and in the
WTW catalog, "Laboratory and field instrumentation".
25.0
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°C
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3
3320

pH/Cond 3320 Safety instructions
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2 Safety instructions
2.1 Safety information
2.1.1 Safety information in the operating manual
This operating manual provides important information on the safe operation of
the meter. Read this operating manual thoroughly and make yourself familiar
with the meter before putting it into operation or working with it. The operating
manual must be kept in the vicinity of the meter so you can always find the infor-
mation you need.
Important safety instructions are highlighted in this operating manual. They are
indicated by the warning symbol (triangle) in the left column. The signal word
(e.g. "CAUTION") indicates the level of danger:
NOTE
indicates a possibly dangerous situation where goods might be damaged
if the actions mentioned are not taken.
2.1.2 Safety signs on the meter
Note all labels, information signs and safety symbols on the meter and in the
battery compartment. A warning symbol (triangle) without text refers to safety
information in this operating manual.
2.1.3 Further documents providing safety information
The following documents provide additional information, which you should
observe for your safety when working with the measuring system:
• Operating manuals of sensors and other accessories
• Safety datasheets of calibration or maintenance accessories (such as buffer
solutions, electrolyte solutions, etc.)
WARNING
indicates a possibly dangerous situation that can lead to seri-
ous (irreversible) injury or death if the safety instruction is not
followed.
CAUTION
indicates a possibly dangerous situation that can lead to
slight (reversible) injury if the safety instruction is not fol-
lowed.

Safety instructions pH/Cond 3320
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2.2 Safe operation
2.2.1 Authorized use
This meter is authorized exclusively for pH, ISE, ORP and conductivity
measurements in a laboratory environment.
Only the operation and running of the meter according to the instructions and
technical specifications given in this operating manual is authorized (see
section 13 TECHNICAL DATA, page 71).
Any other use is considered unauthorized.
2.2.2 Requirements for safe operation
Note the following points for safe operation:
• The meter may only be operated according to the authorized use specified
above.
• The meter may only be supplied with power by the energy sources
mentioned in this operating manual.
• The meter may only be operated under the environmental conditions
mentioned in this operating manual.
• The meter may only be opened if this is explicitly described in this operating
manual (example: Inserting the batteries).
2.2.3 Unauthorized use
The meter must not be put into operation if:
• it is visibly damaged (e.g. after being transported)
• it was stored under adverse conditions for a lengthy period of time (storing
conditions, see section 13 TECHNICAL DATA, page 71).

pH/Cond 3320 Commissioning
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3 Commissioning
3.1 Scope of delivery
MeterpH/Cond 3320
4 batteries 1.5 V Mignon type AA
Short instructions
CD-ROM with
– USB drivers
– detailed operating manual
– Software MultiLab Importer
3.2 Power supply
The pH/Cond 3320 is supplied with power in the following ways:
Battery operation (4 x alkaline manganese batteries, type AA)
USB operation via a connected USB-B cable
3.3 Initial commissioning
Perform the following activities:
Insert the supplied batteries
Switch on the meter (see
section 4.2 SWITCHING ON THE METER, page 13)
Set the date and time (see
section 4.4.6 EXAMPLE 2 ON NAVIGATION: SETTING THE DATE AND TIME, page
18)

Commissioning pH/Cond 3320
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3.3.1 Inserting the batteries
You can operate the meter either with normal batteries or with
rechargeable batteries (Ni-MH). In order to charge the batteries, an
external charging device is required.
1Screws
2 Battery compartment
1. Unscrew the two screws (1) on the underside of the meter.
2. Open the battery compartment (2) on the underside of the meter.
CAUTION
Make sure that the poles of the batteries are positioned cor-
rectly.
The ± signs on the batteries must correspond to the ± signs in
the battery compartment.
3. Place four batteries (type Mignon AA) in the battery compartment.
4. Close the battery compartment (2) and tighten the screws (1).
5. Set the date and time
(see section 4.4.6 EXAMPLE 2 ON NAVIGATION: SETTING THE DATE AND
TIME, page 18).
2
1

pH/Cond 3320 Operation
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4Operation
4.1 General operating principles
4.1.1 Keypad
In this operating manual, keys are indicated by brackets <..> .
The key symbol (e.g. <ENTER>) generally indicates a short keystroke (under
2 sec) in this operating manual. A long keystroke (approx. 2 sec) is indicated
by the underscore behind the key symbol (e.g. <ENTER__>).
<F1>:
<F1__>:
<F2>:
<F2__>:
Softkeys providing situation dependent functions, e.g.:
<F2>/[USB output]:
Outputs data to the USB interface
<F2__>/[USB output]:
Configures the automatic data output to the USB inter-
face
<On/Off>: Switches the meter on or off
<M>: Selects the measured parameter / Quits the settings
<CAL>:
<CAL__>:
Calls up the calibration procedure
Displays the calibration data
<STO>:
<STO__>:
Saves a measured value manually
Opens the menu for the automatic save function
<RCL>:
<RCL__>:
Displays the manually stored measured values
Displays the automatically stored measured values
<><>:
<_><_>:
Menu control, navigation
Increments, decrements values
Increments, decrements values continuously
<ENTER>:
<ENTER__>:
Opens the menu for measurement settings / confirms
entries
Opens the menu for system settings
<AR> Freezes the measured value (HOLD function)
Switches the AutoRead measurement on or off
F1
F2
STOSTO
RCL
ARAR

Operation pH/Cond 3320
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4.1.2 Display
4.1.3 Status information (meter)
1 Status information (sensor)
2 Measured value (with unit)
3 Measured parameter
4 Continuous measurement control (CMC function)
5 Channel display: Plug position of the sensor
6 Sensor symbol (calibration evaluation, calibration interval)
7 Measured temperature (with unit)
8 Status information (meter)
9 Softkeys and date + time
AR Stability control (AutoRead) is active
HOLD Measured value is frozen (<AR> key)
Batteries are almost empty
Data are automatically output to the USB-B inter-
face at intervals
HOLD AR
25.0
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pH
°C
4
3
2
6
7
8
9
1
AutoCal TEC
5
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pH/Cond 3320 Operation
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4.1.4 Socket field
4.2 Switching on the meter
1 pH electrode
2 Temperature sensor
3 Oxygen sensor or conductivity measuring cell
4 Mini USB-B interface
5 Service interface
CAUTION
Only connect sensors to the meter that cannot return any volt-
ages or currents that are not allowed (> SELV and > current
circuit with current limiting).
Almost all customary sensors fulfill these conditions.
1. Switch the meter on with <On/Off>.
The meter performs a self-test.
The display shows the manufacturer's logo while the self-test is being
performed.
The measured value display appears.
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23
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Operation pH/Cond 3320
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4.3 Switching off
Automatic switch-off The instrument has an automatic switch-off function in order to save the
batteries (see section 8.2.1 SYSTEM, page 53). The automatic switchoff function
switches off the meter if no key is pressed for an adjustable period.
The automatic switchoff function is not active
if the communication cable is connected
if the Automatic data storage function is active, or with automatic data trans-
mission
Display illumination The meter automatically switches off the display illumination if no key is
pressed for 30 seconds. The illumination is switched on with the next keystroke
again.
You can also generally switch the display illumination on or off (see section
8.2.1 SYSTEM, page 53).
4.4 Navigation
The principles of navigation in menus and dialogs are explained in the following
sections.
4.4.1 Operating modes
The instrument has the following operating modes:
Only those displays and functions are available in the active operating mode
that are currently being required.
1. Switch the printer off with <On/Off>.
Operating
mode
Description
Measuring The measurement data of the connected sensor are shown
in the measured value display
Calibration The course of a calibration with calibration information, func-
tions and settings is displayed
Storage in
memory
The meter stores measuring data automatically or manually
Transmit-
ting data
The meter transmits measuring data and calibration records
to a USB-B interface automatically or manually.
Setting The system menu or a sensor menu with submenus, set-
tings and functions is displayed

pH/Cond 3320 Operation
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4.4.2 Measured value display
In the measured value display, open the setting menus with <ENTER>. The
current functions of the softkeys are shown on the display.
Use <ENTER> (short pressure) to open the menu for calibration and mea-
surement settings for the displayed measured parameter.
Use <ENTER__> (long keystroke (approx. 2 s) to open the Storage & config
menu with the sensor-independent settings.
Use the keys of the keypad to carry out further functions such as storage or cali-
bration (see section 4.1.1 KEYPAD, page 11). These functions are not available
in other operating situations.
4.4.3 Menus and dialogs
The menus for settings and dialogs in procedures contain further subelements.
To select a subelement, use the <><>keys. The current selection is dis-
played with a frame.
To make further settings, switch to the next higher menu level with
<F1>[Back].
Use <M> to return to the measured value display.
4.4.4 Elements in menus and dialogs
Submenus
The name of the submenu is displayed at the upper edge of the frame. Sub-
menus are opened by confirming with <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 <ENTER>. Subsequently,
the setting can be changed with <><>and <ENTER>. Example:
General
Interface
Clock
Service information
Reset
System
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Back

Operation pH/Cond 3320
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Functions
Functions are designated by the name of the function. They are immediately
carried out by confirming with <ENTER>.
Example: Display the Calibration record function.
Messages
Information is marked by the i symbol. It cannot be selected. Example:
4.4.5 Example 1 on navigation: Setting the language
1. Press the <On/Off> key.
The measured value display appears.
The instrument is in the measuring mode.
Language: Deutsch
Beep:Off
Illumination:On
Contrast:50 %
Switchoff time:1 h
Temperature unit:°C
Stability control:On
General
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Calibration record
Calibration data storage
Buffer:TEC
One point calibration:Yes
Calibration interval:7 d
Unit for slope:mV/pH
i 2.00 4.01 7.00 10.01
pH
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Back
Calibration record
Calibration data storage
Buffer:TEC
One point calibration:Yes
Calibration interval:7 d
Unit for slope:mV/pH
i 2.00 4.01 7.00 10.01
pH
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Back

pH/Cond 3320 Operation
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2. Using <ENTER__> , open the Storage & config menu.
The instrument is in the setting mode.
3. Select the System submenu with <><>.
The current selection is displayed with a frame.
4. Open the System submenu with <ENTER>.
5. Select the General submenu with <><>.
The current selection is displayed with a frame.
6. Open the General submenu with <ENTER>.
pH
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System
Data storage
Storage & config
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Back
General
Interface
Clock
Service information
Reset
System
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Back

Operation pH/Cond 3320
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4.4.6 Example 2 on navigation: Setting the date and time
The meter has a clock with a date function. The date and time are shown in the
measured value display.
When storing measured values and calibrating, the current date and time are
automatically stored as well.
The correct setting of the date and time and date format is important for the fol-
lowing functions and displays:
Current date and time
Calibration date
Identification of stored measured values.
Therefore, check the time at regular intervals.
7. Open the setting mode for the Language with <ENTER>.
8. Select the required language with <><>.
9. Confirm the setting with <ENTER>.
The meter switches to the measuring mode.
The selected language is active.
After a fall of the supply voltage (empty batteries), the date and time
are reset to 01.01.2011 00, 00:00 hours.
Language: Deutsch
Beep:Off
Illumination:On
Contrast:50 %
Switchoff time:1 h
Temperature unit:°C
Stability control:On
General
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Back
Language: Deutsch
Beep:Off
Illumination:On
Contrast:50 %
Switchoff time:1 h
Temperature unit:°C
Stability control:On
General
15.02.2014
14:15
Back

pH/Cond 3320 Operation
ba77054d01 02/2014 19
The date format can be switched from the display of day, month, year
(dd.mm.yyyy) to the display of month, day, year (mm/dd/yyyy or mm.dd.yyyy).
1. In the measured value display:
Using <ENTER__> , open the Storage & config menu.
The instrument is in the setting mode.
2. Select and confirm the System / Clock menu with <><>and
<ENTER>.
The setting menu for the date and time opens up.
3. Select and confirm the Time menu with <><>and <ENTER>.
The hours are highlighted.
4. Change and confirm the setting with <><>and <ENTER>.
The minutes are highlighted.
5. Change and confirm the setting with <><>and <ENTER>.
The seconds are highlighted.
6. Change and confirm the setting with <><>and <ENTER>.
The time is set.
7. If necessary, set the Date and Date format. The setting is made similarly
to that of the time.
8. To make further settings, switch to the next higher menu level with
[Back]<F1>.
or
Switch to the measured value display with <M>.
The instrument is in the measuring mode.
Date format:dd.mm.yyyy
Date:15.02.2014
Time:14:15:25
Clock
15.02.2014
14:15
Back

Operation pH/Cond 3320
20 ba77054d01 02/2014
4.5 Channel display
The pH/Cond 3320 manages the connected sensors and displays which
sensor is plugged to which connection.
4.5.1 Display of several sensors in the measuring mode
The measured values of the connected sensors can be displayed in the follow-
ing ways:
Clear display of all connected sensors
Detailed display of one sensor
(e.g. incl. CMC feature with pH sensors)
With the softkey you can very easily switch between the two display types. The
suitable softkey is displayed depending on the operating situation.
Channel display
Display of the plug position
for the respective parameter
The filled bar indicates for
each connected sensor to
which plug position of the
meter it is connected.
pH
6.949
24.8 °C
15.02.2014
14:15 USB output
pH 6.966
25.0 °C
ϰ 0.479 1/cm
25.0 °C
15.02.2014
14:15 USB output
pH
6.966
25.0 °C
15.02.2014
14:15 USB output