7310
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pH 7310
pH 7310P
pH 7310
Printermodul
pH 7310P
Operating manual
ba75929e03 12/2011
pH meter
pH 7310
Copyright © Weilheim 2011, WTW GmbH
Reproduction in whole - or even in part - is prohibited without the express written permission of WTW GmbH, Weilheim.
Printed in Germany.
2 ba75929e03 12/2011
pH 7310 Contents
pH 7310 - Contents
1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 pH 7310 meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 pH 7310P meter with integrated printer . . . . . . . . . . . . . . . . . . . 7
1.3 Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.1 Safety information in the operating manual . . . . . . . . . . . . 8
2.1.2 Safety signs on the meter . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.3 Further documents providing safety information . . . . . . . . 8
2.2 Safe operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2.2 Requirements for safe operation . . . . . . . . . . . . . . . . . . . . 9
2.2.3 Unauthorized use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3.1 Inserting the batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3.2 Connecting the power pack . . . . . . . . . . . . . . . . . . . . . . . 12
3.3.3 Mounting the stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 General operating principles . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.1 Keypad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.3 Status information (meter) . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.4 Socket field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 Switching on the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3 Switching off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4 Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.1 Measured value display . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.3 Menus and dialogs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4.4 Elements in menus and dialogs. . . . . . . . . . . . . . . . . . . . 17
4.4.5 Example 1 on navigation: Setting the language . . . . . . . 18
4.4.6 Example 2 on navigation: Setting the date and time . . . . 20
ba75929e03 12/2011 3
Contents pH 7310
5 pH value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1.1 Measuring the pH value . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1.2 Measuring the temperature . . . . . . . . . . . . . . . . . . . . . . 24
5.2 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.2.1 Why calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.2.2 When do you have to calibrate? . . . . . . . . . . . . . . . . . . . 25
5.2.3 Automatic calibration (AutoCal) . . . . . . . . . . . . . . . . . . . 25
5.2.4 Manual calibration (ConCal) . . . . . . . . . . . . . . . . . . . . . . 28
5.2.5 Calibration points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.2.6 Calibration data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.2.7 Continuous measurement control (CMC function) . . 34
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 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.1 Measurement settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.1.1 Changing the settings for pH measurements . . . . . . . . . 38
7.1.2 Buffer sets for calibration . . . . . . . . . . . . . . . . . . . . . . . . 39
7.1.3 Calibration interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7.2 Settings for ORP measurements . . . . . . . . . . . . . . . . . . . . . . . 42
7.3 Sensor-independent settings . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.3.1 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.3.2 Data storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
7.4 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
7.4.1 Resetting the measurement settings . . . . . . . . . . . . . . . 44
7.4.2 Resetting the system settings. . . . . . . . . . . . . . . . . . . . . 45
8 Data storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
8.1 Manual storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
8.2 Automatic storage at intervals . . . . . . . . . . . . . . . . . . . . . . 47
8.3 Measurement data storage . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
8.3.1 Editing the measured value storage . . . . . . . . . . . . . . . . 49
8.3.2 Erasing the measurement data storage . . . . . . . . . . . . . 51
8.3.3 Measurement dataset . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
8.3.4 Storage locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9 Transmitting data (USB interface). . . . . . . . . . . . . . . . . . . . . 52
9.1 Options for data transmission . . . . . . . . . . . . . . . . . . . . . . . . . 52
9.2 Connecting a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.3 MultiLab Importer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
10 Printer (only pH 7310P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
10.1 Commissioning / switching the printer on or off . . . . . . . . . . . . 54
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pH 7310 Contents
10.2 Operation / printing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
10.3 Printer settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
10.4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
10.4.1 Changing the roll of paper . . . . . . . . . . . . . . . . . . . . . . . 55
10.5 What to do if... / printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
11 Maintenance, cleaning, disposal. . . . . . . . . . . . . . . . . . . . . . 57
11.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
11.1.1 General maintenance activities . . . . . . . . . . . . . . . . . . . 57
11.1.2 Replacing the batteries. . . . . . . . . . . . . . . . . . . . . . . . . . 57
11.2 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
11.3 Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
11.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
12 What to do if.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
12.1 pH/ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
12.2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
13 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
13.1 Measuring ranges, resolution, accuracy . . . . . . . . . . . . . . . . . 62
13.2 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
14 Firmware update. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
15 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
16 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
ba75929e03 12/2011 5
Overview pH 7310
1
2
3
1 Overview
1.1 pH 7310 meter
The compact pH 7310 precision pH meter enables you to perform pH measurements rapidly and reliably.
The pH 7310 provides the maximum degree of operating comfort, reliability and
measuring certainty for all applications.
The USB interface can be used for data transmission to a PC and for software
updates of the meter.
1 Keypad
2 Display
3 Socket field
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pH 7310 Overview
Printer
modul
1
2
3
4
5
1.2 pH 7310P meter with integrated printer
The integrated printer of the pH 7310P enables to document measurements
according to GLP requirements.
The information concerning the printer of the pH 7310P is given in
a separate chapter (see
page 54).
section 10 PRINTER (ONLY PH 7310P),
1 Keypad
2 Display
3 Socket field
4Printer
5 Control panel of the printer
1.3 Sensors
A measuring system ready to measure consists of the pH 7310 meter and a
suitable sensor.
Suitable sensors are pH electrodes and ORP electrodes.
Information on available sensors is given on the Internet and in the
WTW catalog, "Laboratory and field instrumentation".
ba75929e03 12/2011 7
Safety pH 7310
2Safety
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:
WARNING
indicates a possibly dangerous s ituati on that ca n lea d to s erious (irreversible) injury or death if the safety instru ction is not
followed.
-
CAUTION
indicates a possibly dangerous situation that can lead to
slight (reversible) injury if the safety instruction is not fol
lowed.
NOTE
indicates a possibly dangero us 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.)
-
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pH 7310 Safety
2.2 Safe operation
2.2.1 Authorized use
This meter is authorized exclusively for pH and ORP measurements in the
laboratory.
Only the operation and running of the meter according to the instructions and
technical specifications given
section 13 TECHNICAL DATA, page 62).
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).
in this operating manual is authorized (see
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 62).
ba75929e03 12/2011 9
Commissioning pH 7310
3 Commissioning
3.1 Scope of delivery
pH meter pH 7310
4 batteries 1.5 V Mignon type AA
Power pack
USB cable
Stand
Stand holder
Comprehensive operating manual
Short instructions
CD-ROM with
– USB drivers
– comprehensive operating manual
– software MultiLab Importer
3.2 Power supply
The pH 7310 is supplied with power in the following ways:
Mains operation with the supplied power pack
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
For mains operation: Connect the power pack
If necessary, mount a stand
Switch on the meter (see section 4.2 SWITCHING ON THE METER, page 15)
Set the date and time (see section 4.4.6 EXAMPLE 2 ON NAVIGATION: SETTING
THE DATE AND TIME, page 20)
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pH 7310 Commissioning
1
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.
1 Battery compartment
1. Open the battery compartment (1) on the underside of the meter.
CAUTION
Make sure that the poles of the batteries are positioned correctly.
The ±-signs on the batteries must correspond to the ± signs in
the battery compartment.
2. Place four batteries (type Mignon AA) in the battery compartment.
3. Close the battery compartment (1).
4. Set the date and time
(see section 4.4.6 EXAMPLE 2 ON NAVIGATION: SETTING THE DATE AND
TIME, page 20).
ba75929e03 12/2011 11
Commissioning pH 7310
1
2
3.3.2 Connecting the power pack
CAUTION
The line voltage at the operating site must lie withi n the input
voltage range of the or iginal po wer pack (see
NICAL DATA, page 62).
section 13 TECH-
CAUTION
Use original power packs only (see section 13 TECHNICAL DATA,
page 62).
1. Connect the plug of the power pack to the socket for the power pack on
the pH
2. Connect the original power pack to an easily accessible power outlet.
7310.
3.3.3 Mounting the stand
The stand base can be mounted at the right side of the meter.
12 ba75929e03 12/2011
pH 7310 Operation
F1
F2
STOSTO
RCL
ARAR
4 Operation
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>:
Softkeys providing situation dependent functions, e.g.:
<F1>/[Menu]: Opens the menu for measurement settings
<F1_>/[Menu]: Opens the menu for system settings
<F2__>:
<On/Off>: Switches the meter on or off
<M>: Selects the measured parameter / Quits the settings
<CAL>:
<CAL_>:
<STO>:
<STO_>:
<RCL>:
<RCL_>:
Calls up the calibration procedure
Displays the calibration data
Saves a measured value manually
Opens the menu for the automatic save function
Displays the manually stored measured values
Displays the automatically stored measured values
Menu control, navigation
<><>:
<_><_>:
<ENTER>:
<ENTER_>:
Increments, decrements values
Increments, decrements values continuously
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
ba75929e03 12/2011 13
Operation pH 7310
HOLD AR
25.0
6.093
pH
°C
4
3
2
5
6
7
8
1
AutoCal TEC
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08:00
Menu USB output
4.1.2 Display
1 Status information (sensor)
2 Measured value (with unit)
3 Measured parameter
4 Continuous measurement control (CMC function)
5 Sensor symbol (calibration evaluation, calibration interval)
6 Measured temperature (with unit)
7 Status information (meter)
8 Softkeys and date + time
4.1.3 Status information (meter)
AR Stability control (AutoRead) is active
HOLD Measured value is frozen (<AR> key)
Batteries are almost empty
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pH 7310 Operation
1
2
3
4
5
6
pH
6.949
25.0
°C
01.07.2011
08:00
Menu
USB output
4.1.4 Socket field
1 pH electrode
2 Reference electrode
3 Temperature sensor
4 Mini USB-B interface
5 Power pack
6 Service interface
CAUTION
Only connect sensors to the meter that cannot return any voltages or currents that are not allowed (> SELV and > current
circuit with current limiting).
Almost all customary sensors meet these requirements.
4.2 Switching on the meter
1. Press the <On/Off> key.
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.
ba75929e03 12/2011 15
Operation pH 7310
4.3 Switching off
1. Press the <On/Off> key.
Automatic switch-off
function
Display illumination The meter automatically switches off the display illumination if no key is
The instrument has an automatic switch-off function in order to save the
batteries (see
switches off the measuring instrument if no key is pressed for an adjustable
period.
The automatic switchoff is not active
if the communication cable is connected
if the Automatic data storage function is active, or with automatic data trans-
mission
if the power pack is connected
pressed for 30
again.
You can also generally switch the display illumination on or off (see section
7.3.1 SYSTEM, page 43).
section 7.3.1 SYSTEM, page 43). The automatic switchoff
seconds. The illumination is switched on with the next keystroke
4.4 Navigation
The principles of navigation in menus and dialogs are explained in the following
sections.
4.4.1 Measured value display
In the measured value display, open the setting menus with the <F1> softkey.
The current functions of the softkeys are shown on the display.
Use <F1>/[Menu] (short pressure) to open the menu for calibration and
measurement settings for the displayed measured parameter.
Use <F1_>/[Menu] (long
menu with the sensor-independent settings.
Use the keys of the keypad to carry out further functions such as storage or calibration (see section 4.1.1 KEYPAD, page 13). These functions are not available
in other operating situations.
4.4.2 Operating modes
The meter has the following operating modes:
pressure (approx. 2 s) to open the Storage & config
16 ba75929e03 12/2011
pH 7310 Operation
General
Interface
Clock
Service information
Reset
System
01.07.2011
08:00
Back
Operating
Description
mode
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
The meter stores measuring data automatically or manually
memory
Transmit-
ting data
The meter transmits measurement data and calibration
records to the USB interface automatically or manually.
Setting The system menu or a sensor menu with submenus, set-
tings and functions is displayed
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:
ba75929e03 12/2011 17
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:
Operation pH 7310
Language: English
Beep
: Off
Illumination: On
Contrast: 50 %
Switchoff time
: 1 h
General
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08:00
Back
Calibration record
Calibration data storage
Buffer: TEC
One point calibration
: Yes
Calibration interval: 7 d
Unit for slope: mV/pH
pH
01.07.2011
08:00
Back
Calibration record
Calibration 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
01.07.2011
08:00
Back
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
4.4.5 Example 1 on navigation: Setting the language
1. Press the <On/Off> key.
Information is marked by the i symbol. It cannot be selected. Example:
The measured value display appears.
The instrument is in the measuring mode.
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pH 7310 Operation
pH
6.949
25.0
°C
01.07.2011
08:00
Menu USB output
System
Data storage
Storage & config
01.07.2011
08:00
Back
General
Interface
Clock
Service information
Reset
System
01.07.2011
08:00
Back
2. Using <F1_>/[Menu], 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>.
ba75929e03 12/2011 19
Operation pH 7310
Language: English
Beep
: Off
Illumination: On
Contrast: 50 %
Switchoff time
: 1 h
General
01.07.2011
08:00
Back
Language: English
Beep
: Off
Illumination
: On
Contrast
: 50 %
Switchoff time
: 1 h
General
01.07.2011
08:00
Back
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.
4.4.6 Example 2 on navigation: Setting the date and time
The measuring instrument 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 following functions and displays:
Current date and time
Calibration date
Identification of stored measured values.
Therefore, check the time at regular intervals.
After a fall of the supply voltage (empty batteries), the date and time
are reset to 01.01.2011 00, 00:00 hours.
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pH 7310 Operation
Date format: dd.mm.yyyy
Date: 01.07.2011
Time
: 08:00:25
Clock
01.07.2011
08:00
Back
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 <F1_>/[Menu], 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.
ba75929e03 12/2011 21
pH value pH 7310
pH
6.949
24.8 °C
01.07.2011
08:00
Menu
USB output
5 pH value
5.1 Measuring
5.1.1 Measuring the pH value
When connecting an earthed PC/printer, measurements cannot be
performed in earthed media as the values would be incorrect.
The USB interface is not galvanically isolated.
To ensure the high measurement accuracy of the measuring system, always measure with a calibrated electrode (see section 5.2
C
ALIBRATION, page 25).
1. Connect the pH electrode to the meter.
2. If necessary, select the measured parameter with <M>.
3. When measuring without temperature sensor:
Temper the test sample or measure the current temperature and enter it
with <>
<>.
Stability control
(AutoRead)
& HOLD function
4. Immerse the pH electrode in the test sample.
The measured value is checked for stability (automatic stability control).
The display of the measured parameter flashes.
5. Wait for a stable measured value.
The display of the measured parameter no longer flashes.
The stability control function (AutoRead) continually checks the stability of the
measurement signal. The stability has a considerable impact on the reproducibility of measured values.
The measured parameter flashes on the display
as soon as the measured value is outside the stability range
when the automatic Stability control is switched off.
You can activate or switch off the automatic Stabil ity control function (see
section 7.1.1 CHANGING THE SETTINGS FOR PH MEASUREMENTS, page 38).
22 ba75929e03 12/2011
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