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.
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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.
20 ba75929e03 12/2011
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
pH 7310 pH value
1. Freeze the measured value with <AR>.
The [HOLD] status indicator is displayed.
The HOLD function is active.
You can terminate the Stabi lity control function and the HOLD function with <AR> or <M> at any time.
2.
Using <ENTER>, activate the Stability control function manually.
The [AR] status indicator appears while the measured value is
assessed as not stable. A progress bar is displayed and the display of
the measured parameter flashes.
The [HOLD][AR] status indicator appears as soon as a stable measured value is recognized. The progress bar disappears and the display
of the measured parameter stops flashing.
The current measurement data is output to the interface. Measurement
data meeting the stability control criterion is marked by AR.
Criteria for a stable
measured value
You can prematurely terminate the Stability control function manu-
ally with <ENTER> at any time. If the Stability control function is
prematurely terminated, the current measurement data are output
to the interface without the AutoRead info.
3.
Using <ENTER>, start a further measurement with stability control.
or
Release the frozen measured value again with <AR> or <M>.
The [AR] status display disappears. The display switches back to the
previous indication.
The Stability control function checks whether the measured values are stable
within the monitored time interval.
Measured
Time interval Stability in the time interval
parameter
pH value 15 seconds Δ pH: Better than 0.01
Temperature 15 seconds Δ T (° C): Better than 0.02
The minimum duration until a measured value is assessed as stable is the
monitored time interval. The actual duration is mostly longer.
ba75929e03 12/2011 23
pH value pH 7310
5.1.2 Measuring the temperature
For reproducible pH and ORP measurements, it is essential to measure the
temperature of the test sample.
You have the following options to measure the temperature:
Automatic measurement of the temperature with the temperature sensor
(NTC 30 or Pt 1000) integrated in the sensor.
Measurement with an external temperature sensor.
Manual determination and input of the temperature.
The measuring instrument recognizes whether a suitable sensor is connected
and automatically switches on the temperature measurement.
The display of the temperature indicates the active temperature measuring
mode:
Temperature
sensor
Resolution of the
temp. display
Temp. measurement
yes 0.1 °C Automatic with tempera-
ture sensor
- 1 °C Manual
If you wish to measure (or calibrate) without temperature sensor, proceed as
follows:
1. Measure the current temperature of the test sample.
2. Set the temperature value with <><>.
or
In the <F1>/[Menu]/Man. temperature menu, set the temperature value
with <><>.
24 ba75929e03 12/2011
pH 7310 pH value
5.2 Calibration
5.2.1 Why calibrate?
pH electrodes age. This changes the zero point (asymmetry) and slope of the
pH
electrode. As a result, an inexact measured value is displayed. Calibration
determines and stores the current values of the zero point and slope of the
electrode.
Thus, you should calibrate at regular intervals.
5.2.2 When do you have to calibrate?
After connecting a sensor
Routinely within the framework of the company quality assurance
When the calibration interval has expired
5.2.3 Automatic calibration (AutoCal)
Make sure that in the sensor menu, Buffer menu, the buffer set is correctly
selected (see
7.1.1 CHANGING THE SETTINGS FOR PH MEASUREMENTS, PAGE 38).
Use any one to five buffer solutions of the selected buffer set in ascending or
descending order.
Below, calibration with Technical buffers (TEC) is described. When other buffer
sets are used, other nominal buffer values are displayed. Apart from that, the
procedure is identical.
If single-point calibration was set in the menu, the calibration procedure is automatically finished with the measurement of buffer solution 1 and the calibration record is displayed.
1. Connect the pH electrode to the meter.
2. Keep the buffer solutions ready.
When measuring without temperature sensor:
Temper the buffer solutions or measure the current temperature.
3. In the measured value display, select the measured parameter pH or mV
with <M>.
4. Start the calibration with <CAL>.
The calibration display for the first buffer appears (voltage display).
ba75929e03 12/2011 25
pH value pH 7310
pH 1
-180.0
24.8 °C
AutoCal TEC
01.07.2011
08:00
Buffer
mV
pH
-180.0
24.8 °C
AutoCal TEC
10.011
01.07.2011
08:00
AR
Buffer
mV
5. Thoroughly rinse the electrode with deionized water.
6. Immerse the electrode in the first buffer solution.
7. When measuring without temperature sensor:
Measure the temperature of the buffer and enter it with <><>.
8. Start the measurement with <ENTER>.
The measured value is checked for stability (stability control). The [AR]
status indicator is displayed. A progress bar is displayed and the display
of the measured parameter flashes.
Continuing with two-
point calibration
26 ba75929e03 12/2011
9. Wait for the end of the measurement with stability control or accept the
calibration value with <ENTER>.
The calibration display for the next buffer appears (voltage display).
10. If necessary, finish the calibration procedure as a single-point calibration
with <M>.
The calibration record is displayed.
For single-point cali bration, the instrument uses the Nernst slope
(-59.2 mV/pH at 25 °C) and determines the zero point of the electrode.
11. Thoroughly rinse the electrode with deionized water.
12. Immerse the electrode in the second buffer solution.
13. When measuring without temperature sensor:
Measure the temperature of the buffer and enter it with <><>.
pH 7310 pH value
pH
0.0
24.8 °C
AutoCal TEC
7.000
01.07.2011
08:00
AR
Buffer
mV
pH
180.0
24.8 °C
AutoCal TEC
4.010
01.07.2011
08:00
AR
Buffer
mV
14. Start the measurement with <ENTER>.
The measured value is checked for stability (stability control). The [AR]
status indicator is displayed. A progress bar is displayed and the display
of the measured parameter flashes.
15. Wait for the measurement with stability control to be completed or terminate the stability control and take over the calibration value with
<ENTER>.
The calibration display for the next buffer appears (voltage display).
Continuing with
three- to five-point
calibration
16. If necessary, finish the calibration procedure as a two-point calibration
with <M>.
The calibration record is displayed.
17. Thoroughly rinse the electrode with deionized water.
18. Immerse the electrode in the next buffer solution.
19. When measuring without temperature sensor:
Measure the temperature of the buffer and enter it with <><>.
20. Start the measurement with <ENTER>.
The measured value is checked for stability (stability control). The [AR]
status indicator is displayed. A progress bar is displayed and the display
of the measured parameter flashes.
ba75929e03 12/2011 27
pH value pH 7310
pH
0.0
24.8 °C
ConCal
1
01.07.2011
08:00
Buffer
mV
21. Wait for the measurement with stability control to be completed or terminate the stability control and take over the calibration value with
<ENTER>.
The calibration display for the next buffer appears (voltage display).
22. If necessary, use <M> to finish calibration or
Continue calibrating using the next buffer with <ENTER>.
Calibration is automatically completed after the last buffer of a buffer set has been measured. Then the calibration record is displayed.
The calibration line is determined by linear regression.
5.2.4 Manual calibration (ConCal)
Make sure that in the sensor menu, Buffer menu, the ConCal buffer set is
selected (see
page 38).
section 7.1.1 CHANGING THE SETTINGS FOR PH MEASUREMENTS,
Use any one to five buffer solutions in ascending or descending order.
If single-point calibration was set in the menu, the calibration procedure is automatically finished with the measurement of buffer solution 1 and the calibration record is displayed.
1. Connect the pH electrode to the meter.
The pH measuring window is displayed.
2. Keep the buffer solutions ready.
When measuring without temperature sensor:
Temper the buffer solutions or measure the current temperature.
3. In the measured value display, select the measured parameter pH or
mV with <M>.
4. Start the calibration with <CAL>.
The calibration display appears.
5. Thoroughly rinse the electrode with deionized water.
28 ba75929e03 12/2011
pH 7310 pH value
pH
0.0
24.8 °C
ConCal
7.000
01.07.2011
08:00
Buffer
mV
AR
pH
7.000
24.8 °C
ConCal
1
01.07.2011
08:00
Buffer
6. Immerse the electrode in the first buffer solution.
7. When measuring without temperature sensor:
Measure the temperature of the buffer and enter it with <><>.
8. Start the measurement with <ENTER>.
The measured value is checked for stability (stability control). The [AR]
status indicator is displayed. A progress bar is displayed and the display
of the measured parameter flashes.
9. Wait for the end of the measurement with stability control or accept the
calibration value with <ENTER>.
The calibration display for the setting of the nominal buffer value appears.
10. Set the nominal buffer value for the measured temperature with
<><>.
11. Accept the set calibration value with <ENTER>.
The calibration display for the next buffer appears (voltage display).
12. If necessary, finish the calibration procedure as a single-point calibration
with <M>.
The calibration record is displayed.
For single-point cali bration, the instrument uses the Nernst slope
13. Thoroughly rinse the electrode with deionized water.
Continuing with two-
point calibration
ba75929e03 12/2011 29
(-59.2 mV/pH at 25 °C) and determines the zero point of the electrode.
pH value pH 7310
pH
4.035
24.8 °C
ConCal
2
01.07.2011
08:00
Buffer
14. Immerse the electrode in the second buffer solution.
15. When measuring without temperature sensor:
Measure the temperature of the buffer and enter it with <><>.
16. Start the measurement with <ENTER>.
The measured value is checked for stability (stability control). The [AR]
status indicator is displayed. A progress bar is displayed and the display
of the measured parameter flashes.
17. Wait for the measurement with stability control to be completed or terminate the stability control and take over the calibration value with
<ENTER>.
The calibration display for the setting of the nominal buffer value appears.
Continuing with
three- to five-point
calibration
18. Set the nominal buffer value for the measured temperature with
<><>.
19. Accept the set calibration value with <ENTER>.
The calibration display for the next buffer appears (voltage display).
20. Finish the calibration procedure as a two-point calibration with <M>.
The calibration record is displayed.
21. Thoroughly rinse the electrode with deionized water.
22. Immerse the electrode in the next buffer solution.
23. When measuring without temperature sensor:
Measure the temperature of the buffer and enter it with <><>.
24. Start the measurement with <ENTER>.
The measured value is checked for stability (stability control). The [AR]
status indicator is displayed. A progress bar is displayed and the display
of the measured parameter flashes.
25. Wait for the measurement with stability control to be completed or terminate the stability control and take over the calibration value with
<ENTER>.
The calibration display for the setting of the nominal buffer value appears.
30 ba75929e03 12/2011
pH 7310 pH value
pH
9.958
24.8 °C
ConCal
3
01.07.2011
08:00
Buffer
26. Set the nominal buffer value for the measured temperature with
<><>.
27. Accept the set calibration value with <ENTER>.
The calibration display for the next buffer appears (voltage display).
28. Use <M> to finish calibration or
Continue calibrating using the next buffer with <ENTER>.
After the fifth buffer has been measured the calibration is automatically finished. Then the calibration record is displayed.
The calibration line is determined by linear regression.
5.2.5 Calibration points
Calibration can be performed using one to five buffer solutions in any order
(single-point to five-point calibration). The meter determines the following
values and calculates the calibration line as follows:
Determined
values
1-point Asy Zero point = Asy
2-point Asy
Slp.
3-point to
5-point
Asy
Slp.
Displayed calibration data
Slope = Nernst slope
(-59.2 mV/pH at 25 °C)
Zero point = Asy
Slope = Slp.
Zero point = Asy
Slope = Slp.
The calibration line is calculated by linear regression.
You can display the slope in the units, mV/pH or % (see section
ba75929e03 12/2011 31
7.1.1 C
HANGING THE SETTINGS FOR PH MEASUREMENTS, page 38).
pH value pH 7310
5.2.6 Calibration data
The calibration record is automatically transmitted to the interface
after calibrating.
Displaying the cali-
bration data
Displaying the cali-
bration data storage
The calibration record of the last calibration is to be found under the menu item,
<F1> / [Menu]Calibration
/ Calibration rec o rd . To open it, press the <CAL_>
key in the measured value display.
Subsequently, you can transmit the displayed calibration data to the interface,
e. g. to a PC, with <F2>[USB output].
The calibration records of the last calibrations (up to 10) are available in the
menu, <F1>/[Menu] / Calibration / Calibration data storage and in the menu,
<F1_>/[Menu] / Storage & config/Data
Menu item Setting/func-
storage / Calibration data storage.
Description
tion
Calibration /
- Displays the calibration record.
Calibration data storage /Display
Further options:
Scroll through the calibration
or
records with <><>.
Output the displayed calibra-
Data storage /
Calibration data storage /Display
tion record to the interface with
<F2>/[USB output].
Quit the display with <F1>/
[Back] or <ENTER>.
Calibration evalua-
tion
Switch directly to the mea-
sured value display with <M>.
Calibration /
Calibration data stor-
- Outputs the calibration records to
the interface.
age /
Output to USB
or
Data storage /
Calibration data storage /Output to USB
After calibrating, the meter automatically evaluates the calibration. The zero
point and slope are evaluated separately. The worse evaluation of both is taken
into account. The evaluation appears on the display and in the calibration
record.
32 ba75929e03 12/2011
pH 7310 pH value
inoLab pH 7310
Ser. no. 11292113
CALIBRATION pH
30.06.2011 15:55
Ser. no. 10501234
AutoCal TEC
Buffer 1 4.01
Buffer 2 7.00
Buffer 3 10.01
Voltage
1 184.0 mV 24.0 °C
Voltage 2 3.0 mV 24.0 °C
Voltage 3 -177.0 mV 24.0 °C
Slope -60.2 mV/pH
Asymmetry 4.0 mV
Sensor +++
etc...
Display Calibration
record
+++
++
+
-
Clean the electrode according to the
electrode operating manual
Error Error
Error elimination (see section 12 WHAT
TO DO IF..., page 59)
Zero point
[mV]
Slope
[mV/pH]
- 15 ... + 15 -60,5 ... -58,0
- 20 ... <-15
>-58,0 ... -57,0
or
>+15 ... + 20
- 25 ... <- 20
or
>+ 20 ... + 25
- 30 ... <- 25
or
->+25 ... + 30
-61,0 ... <-60,5
or
>-57,0 ... -56,0
-62,0 ... <-61,0
or
>-56,0 ... -50,0
- 30 ... + 30 -62,0 ... -50,0
Calibration record
(example)
ba75929e03 12/2011 33
pH value pH 7310
25.0
6.093
1
2
3
4
pH
°C
0
14
01.07.2011
08:00
Menu
USB output
5.2.7 Continuous measurement control (CMC function)
The Continuous Measurement Control (CMC function) facilitates to evaluate
the current measured value instantly and definitely.
After each successful calibration the scale of the pH measuring range is
displayed in the measured value display. Here you can very clearly see
whether or not the current measured value is in the calibrated part of the
measuring range.
The following information is displayed:
1 Measuring range for which a valid calibration is available (white).
Measured values in this range are suitable for documentation.
2 Measuring range for which no valid calibration is available (shaded).
Measured values in this range are not suitable for documentation. If
necessary, calibrate the meter with buffers covering this measuring
range.
If the current measured value is outside the calibrated range, this
area is shaded stronger.
If a measured value is outside the measuring range pH 0 - 14, overflow arrows are displayed at the left or right edge of the measuring
range.
3 Currently measured pH value (needle)
4 Marking lines for all nominal buffer values used with the last valid cali-
bration
The limits of the calibrated range are determined by the buffers used for calibration:
Lower limit: Buffer with lowest pH value - 2 pH units
Upper limit: Buffer with highest pH value + 2 pH units
34 ba75929e03 12/2011
pH 7310 ORP voltage
U
157.0 mV
24.8 °C
01.07.2011
08:00
Menu
USB output
6 ORP voltage
6.1 Measuring
6.1.1 Measuring the ORP
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.
1. Connect the ORP electrode to the meter.
2. If necessary, select the mV display with <M>.
3. When measuring without temperature sensor:
Measure the temperature of the test sample and enter it with <> <>.
4. Immerse the ORP electrode in the test sample.
The measured value is checked for stability (automatic stability control).
The display of the measured parameter flashes.
Stability control
(AutoRead )
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.
You can activate or switch off the automatic Stability control function (see
section 7.1.1 CHANGING THE SETTINGS FOR PH MEASUREMENTS, page 38).
The measured parameter flashes on the display
Criteria for a stable
measured value
ba75929e03 12/2011 35
as soon as the measured value is outside the stability range
when you switch over between the measured parameters with <M>.
when the automatic Stability control is switched off.
The Stability control function checks whether the measured values are stable
within the monitored time interval.
ORP voltage pH 7310
Manually starting
the stability control
Measured parame-
Time interval Stability in the time interval
ter
ORP voltage 15 seconds Δ mV: Better than 0.3
Temperature 15 seconds Δ T (° C): Better than 0.02
The minimum duration until a measured value is assessed as stable is the
monitored time interval. The actual duration is mostly longer.
You can start the Stability control manually at any time, irrespective of the set-
ting for automatic Stability control (see section 7.1.1 C
FOR PH MEASUREMENTS, page 38) in the Measurement menu.
HANGING THE SETTINGS
1. Freeze the measured value with <AR>.
The [HOLD] status indicator is displayed.
2. Using <ENTER>, activate the Stability control function manually.
The [AR] status indicator appears while the measured value is assessed
as not stable. A progress bar is displayed and the display of the measured
parameter flashes.
The [HOLD][AR] status indicator appears as soon as a stable measured
value is recognized. The progress bar disappears and the display of the
measured parameter stops flashing.
The current measurement data is output to the interface. Measurement
data meeting the stability control criterion is marked by AR.
Freezing the mea-
sured value (HOLD
function)
You can prematurely terminate the Stability control function manu-
ally with <ENTER> at any time. If the Stability control function is
prematurely terminated, the current measurement data are output
to the interface without the AutoRead info.
3.
Using <ENTER>, start a further measurement with Stability control.
or
Release the frozen measured value again with <AR>.
The display switches to the measured value display.
The [AR][HOLD] status display disappears.
With the HOLD function, you can freeze the current measured value. The displayed measured value stops changing until you switch the HOLD function off.
If the HOLD function is active, you can, e.g. start a manual measurement with stability control.
1. Freeze the measured value with <AR>.
The [HOLD] status indicator is displayed.
36 ba75929e03 12/2011
pH 7310 ORP voltage
2. Release the frozen measured value again with <AR>.
The HOLD function is switched off.
The [HOLD] status display disappears.
6.1.2 Measuring the temperature
For reproducible ORP measurements, it is essential to measure the temperature of the test sample.
You have the following options to measure the temperature:
Automatic measurement of the temperature by the temperature sensor
(NTC 30 or Pt 1000) integrated in electrode.
Measurement by an external temperature sensor.
Manual determination and input of the temperature.
The measuring instrument recognizes whether a suitable sensor is connected
and automatically switches on the temperature measurement.
The display of the temperature indicates the active temperature measuring
mode:
Temperature
sensor
Resolution of the
temp. display
Temp. measurement
yes 0.1 °C Automatic with temper-
ature sensor
- 1 °C Manual
If you wish to measure (or calibrate) without temperature sensor, proceed as
follows:
1. Measure the current temperature of the test sample.
2. Set the temperature value with <><>.
or
In the <F1>/[Menu]/Man. temperature menu, set the temperature value
with <><>.
6.2 ORP calibration
ORP electrodes are not calibrated. You can, however, check ORP
electrodes by measuring the ORP of a test solution and comparing
the value with the nominal value.
ba75929e03 12/2011 37
Settings pH 7310
7Settings
7.1 Measurement settings
7.1.1 Changing the settings for pH measurements
The settings are made in the menu for calibration and measurement settings of
the pH/ORP measurement. To open the settings, display the required parame-
ter in the measured value display and press the <F1>/[menu] or <ENTER> key.
After completing the settings, switch to the measured value display with <M>.
Default settings are printed in bold.
Menu item Possible set-
ting
Calibration /Calibration record
Calibration /
Calibration data
storage /Display
- Displays the calibration record of
- Displays the calibration record.
Description
the last calibration.
Further options:
Scroll through the calibration
records with <><>.
Output the displayed calibration
record to the interface with
<F2>/[USB output].
Output all calibration records to
the interface with <F2__>[USB
output].
Quit the display with <F1>/
[Back] or <ENTER>.
Switch directly to the measured
value display with <M>.
Calibration / Calibration data storage / Output to USB
Calibration / Serial
number (probe)
38 ba75929e03 12/2011
- Outputs the calibration records to
the interface.
Entry of the serial number of the
connected sensor.
The serial number is output in the
calibration record.
Change the content of the high-
lighted position with <><>.
Go to the next position with
<F2>/[].
When the serial number has
been completely entered, con-
firm with <ENTER>.
pH 7310 Settings
Menu item Possible set-
ting
Calibration /Buffer TEC
NIST/DIN
ConCal
...
Calibration /One
point calibration
Calibration /Cali-
Yes
No
1 ... 7 ... 999 d Calibration interval for the pH elec-
bration interval
Calibration /Unit for
slope
mV/pH
%
Man. temperature -25 ... +25 ...
+130 °C
Description
Buffer sets to be used for pH calibration (see section 5.2 CALIBRA-
TION, page 25).
Quick calibration with 1 buffer
trode (in days).
The meter reminds you to calibrate
regularly by the flashing sensor
symbol in the measuring window.
Unit of the slope.
The % display refers to the Nernst
slope of -59.2
mV/pH (100 x deter-
mined slope/Nernst slope).
Entry of the manually determined
temperature. For measurements
without temperature sensor only.
Temperature unit °C
°F
Temperature unit,
degrees Celsius or degrees Fahrenheit.
All temperatures are displayed
with the selected unit.
Resolution pH 0.001
Resolution of the pH display
0.01
0.1
Stability control On
Off
Switches on or off the automatic
stability control during measure
ment (see section 5.1.1 MEASUR-
ING THE PH VALUE, page 22)
Reset - Resets all sensor settings to the
delivery condition (see
section
7.4.1 RESETTING THE MEASURE-
MENT SETTINGS, page 44).
7.1.2 Buffer sets for calibration
-
You can use the buffer sets quoted in the table for an automatic calibration. The
pH values are valid for the specified temperature values. The temperature
dependence of the pH values is taken into consideration during the calibration.
ba75929e03 12/2011 39
Settings pH 7310
No. Buffer set * pH values at
1 ConCal Any Any
2 NIST/DIN
DIN buffers according to DIN 19266
and NIST Traceable Buffers
1.679
4.006
6.865
9.180
12.454
3 TEC
WTW Technical buffers
2.000
4.010
7.000
10.011
4 Merck 1* 4.000
7.000
9.000
5 Merck 2 * 1.000
6.000
8.000
13.000
6 Merck 3 * 4.660
6.880
9.220
7 Merck 4 * 2.000
4.000
7.000
10.000
25 °C
25 °C
20°C
20°C
20°C
20°C
8 Merck 5 * 4.010
7.000
10.000
9 DIN 19267 1.090
4.650
6.790
9.230
10 Mettler Toledo USA * 1.679
4.003
7.002
10.013
11 Mettler Toledo EU * 1.995
4.005
7.002
9.208
12 Fisher * 2.007
4.002
7.004
10.002
25 °C
25 °C
25 °C
25 °C
25 °C
40 ba75929e03 12/2011
pH 7310 Settings
No. Buffer set * pH values at
13 Fluka BS * 4.006
6.984
8.957
14 Radiometer * 1.678
4.005
7.000
9.180
15 Baker * 4.006
6.991
10.008
16 Metrohm * 3.996
7.003
8.999
17 Beckman * 4.005
7.005
10.013
18 Hamilton Duracal * 4.005
7.002
10.013
25 °C
25 °C
25 °C
25 °C
25 °C
25 °C
19 Precisa * 3.996
7.003
8.999
20 Reagecon TEC * 2.000
4.010
7.000
10.000
21 Reagecon 20 * 2.000
4.000
7.000
10.000
13.000
22 Reagecon 25 * 2.000
4.000
7.000
10.000
13.000
23 Chemsolute * 2,000
4,000
7,000
10,000
25 °C
25 °C
20°C
25 °C
20 °C
24 USABlueBook * 4,000
25 °C
7,000
10,000
* Brand names or trade names are trademarks of their respective owners pro-
tected by law.
ba75929e03 12/2011 41
Settings pH 7310
The buffers are selected in the menu, pH / <F1>/[Menu] / Calibration / Buffer (see 7.1.1 C
MENTS, PAGE 38).
HANGING THE SETTINGS FOR PH MEASURE-
7.1.3 Calibration interval
The calibration evaluation is displayed as a sensor symbol.
The sensor symbol flashes after the adjusted calibration interval has expired. It
is still possible to measure.
To ensure the high measuring accuracy of the measuring system,
calibrate after the calibration interval has expired.
Setting the calibra-
tion interval
The calibration interval is set to 7 days in the factory.
You can change the interval (1 ... 999 days):
1. Open the menu for measurement settings with [Menu]<F1>.
2. In the Calibration / Calibration interval menu, set the calibration interval
with
<><>.
3. Confirm the setting with <ENTER>.
4. Quit the menu with <M>.
7.2 Settings for ORP measurem ents
The settings are made in the menu for calibration and measurement settings of
the pH/ORP measurement. To open the settings, display the required parame-
ter in the measured value display and press the <F1>/[menu] or <ENTER> key.
After completing the settings, switch to the measured value display with <M>.
Default settings are printed in bold.
Menu item Possible
setting
Description
Man. temperature -25 ... +25
... +130
°C
Entry of the manually determined temperature. For measurements without
temperature sensor only.
Temperature unit °C
°F
Temperature unit,
degrees Celsius or degrees Fahrenheit.
All temperatures are displayed with the
selected unit.
42 ba75929e03 12/2011
pH 7310 Settings
Menu item Possible
Description
setting
Resolution mV 0.1
Resolution of the mV display
1
Stability control On
Off
Switches on or off the automatic stability
control during measurement (see
section Stability control (AutoRead) &
HOLD function, page 22 )
Reset - Resets all sensor settings to the delivery
condition (see
THE MEASUREMENT SETTINGS, page 44).
section 7.4.1 RESETTING
7.3 Sensor-independent settings
7.3.1 System
To open the Storage & config menu, press the <F1_>[Menu] key in the mea-
sured value display. After completing the settings, switch to the measured
value display with <M>.
Default settings are printed in bold.
Menu item Possible set-
ting
System / General /
Language
Deutsch
English
(further)
System / General /
Beep
System / General /
Illumination
On
Off
Auto
On
Off
System / General /
0 ... 50 ... 100 % Changing the display contrast
Contrast
System / General /
Switchoff time
System / Interface /
Baud rate
10 min ... 1h ...
24 h
1200, 2400,
4800, 9600,
19200
Description
Selects the menu language
Switches on/off the beep on
keystroke
Switches the display illumination on/off
Adjusts the switch-off time
Baud rate of the data interface
System / Interface /
Output format
ASCII
CSV
Output format for data transmission (see section 9 TRANS-
MITTING DATA (USB INTERFACE),
page 52)
System / Interface /
Decimal separator
ba75929e03 12/2011 43
Dot (xx.x)
Comma (xx,x)
Decimal separator
Settings pH 7310
Menu item Possible set-
Description
ting
System / Interface /
Output header
Output of a header for Output
format: CSV
System / Printer Settings for the integrated prin-
ter of the pH 7310 P.
For details, see section 10
PRINTER (ONLY PH 7310P),
page 54
System /Clock Date format
Date
Time
System /Service
information
Time and date settings (see
section 4.4.6 EXAMPLE 2 ON
NAVIGATION: SETTING THE DATE
AND TIME, page 20)
Hardware version and software
version of the meter are dis
-
played.
System /Reset - Resets the system settings to
the delivery condition (see
sec-
tion 7.4.2 RESETTING THE SYS-
TEM SETTINGS, page 45).
7.3.2 Data storage
This menu contains all functions to display, edit and erase stored measured
values and calibration records (see
section 8 DATA STORAGE, page 46).
7.4 Reset
You can reset (initialize) all sensor settings and sensor-independent settings
separately from each other.
7.4.1 Resetting the measurement settings
The calibration data are reset to the default settings together with
the measuring parameters. Recalibrate after performing a reset.
The following settings for pH measurements are reset to the default settings
with the Reset function:
Setting Default settings
Buffer AutoCalTEC
Cal. interval 7 d
Unit for slope mV/pH
44 ba75929e03 12/2011
pH 7310 Settings
Setting Default settings
Measured parameter pH
Resolution pH 0.001
Resolution mV 0.1
Asymmetry 0 mV
Slope -59.2 mV
Man. temperature 25 °C
One point calibration No
Stability control On
Temperature unit °C
The sensor settings are reset under the Reset menu item in the menu for calibration and measurement settings. To open it, press the <F1>/[Menu] or
<ENTER> key in the measured value display.
7.4.2 Resetting the system settings
The following system settings can be reset to the default condition:
Setting Default settings
Language English
Beep On
Baud rate 4800 Baud
Output format ASCII
Contrast 50 %
Illumination Auto
Switchoff time 1 h
The system settings are reset in the menu, Stor age & config / System / Reset.
To open the Storage & config menu, press the <F1_>[Menu] key in the
measured value display.
ba75929e03 12/2011 45
Data storage pH 7310
01.07.2011 11:24:16
pH 7.000 24.8 °C AR +++
ID number: 1
Continue
Manual data storage 4 From 500
01.07.2011
08:00
Back
Data storage full. Erase?
Yes
No
Warning
01.07.2011
08:00
Back
8 Data storage
You can transmit measured values (datasets) to the data storage:
Manual storage (see section 8.1 M
Automatic storage at intervals (see section 8.2 A
INTERVALS, page 47)
ANUAL STORAGE, page 46)
UTOMATIC STORAGE AT
Each storage process transmits the current dataset to the interface at the same
time.
8.1 Manual storage
You can transmit a measurement dataset to the data storage as follows. The
dataset is at the same time output to the interface:
1. Press the <STO> key shortly.
The menu for manual storage appears.
If the storage is full The following window appears if all 500 storage locations are occupied:
46 ba75929e03 12/2011
2. If necessary, change and confirm the ID number (1 ... 10000) with
<><> and <ENTER>.
The dataset is stored. The meter switches to the measured value display.
pH 7310 Data storage
1
ID number
1
Interval
30 s
Duration
180 min
Continue
0d03h00min
0 1d17h33min
Automatic data storage
01.07.2011
08:00
2
3
Back
You have the following options:
To erase the entire storage, confirm Yes.
To cancel the storage process and switch to the measured value display,
confirm No. Then you can e.g. transmit the stored data to a PC (see section
8.3.1 E
erase the storage (see section 8.3.2 E
AGE, page 51).
DITING THE MEASURED VALUE STORAGE, page 49) and subsequently
RASING THE MEASUREMENT DATA STOR-
8.2 Automatic storage at intervals
The storage interval (Interval) determines the time interval between automatic
storage processes. Each storage process transmits the current dataset to the
interface at the same time.
Configuring the
automatic storage
function
1. Press the <STO_> key.
The menu for automatic storage appears.
1 Adjusted entire storage duration
2 Max. available storage duration
3 Graphical display of the storage usage
ba75929e03 12/2011 47
Data storage pH 7310
1
2
pH
6.949
25.0
°C
0d03h00min
01.07.2011
08:00
0
14
USB outputEco mode
Settings You can configure the automatic storage function with the following settings:
Menu item Possible set-
ting
ID number 1 ... 10000 ID number for the dataset series.
Interval 1 s, 5 s, 10 s,
30
s, 1 min,
5
min,
10
min,
15
min,
30
min,
60
min
Duration 1 min ... x min Storage duration.
Description
Storage interval.
The lower limit of the storage
interval can be restricted by the
number of free storage locations.
The upper limit is restricted by the
storage duration.
Specifies after which time the
automatic storage should be ter
minated.
The lower limit of the storage
duration is restricted by the stor
age interval.
The upper limit is restricted by the
number of free storage locations.
-
-
matic storage func-
Energy saving mode
Starting the auto-
tion
([Eco mode])
To start the automatic storage function, select Continue with <><> and
confirm with <ENTER>. The meter switches to the measured value display.
1 Remaining storage duration
2 Graphical display of the storage duration
The active automatic storage function can be recognized by the progress bar
in the function display. The progress bar indicates the remaining storage dura
tion.
If the automatic storage function is activated, only the following
keys are active: Softkeys, <M>, <STO_> and <On/Off>. The other
keys and the automatic switch-off function are deactivated.
If the automatic storing function is active, the meter provides an energy saving
mode ([Eco mode]) to avoid unnecessary energy consumption. The energy
saving mode switches off functions of the meter that are not required for the
-
48 ba75929e03 12/2011
pH 7310 Data storage
Stop automatic storage?
Yes
No
Warning
01.07.2011
08:00
Back
automatic storage of measurement data (such as the display). By pressing any
key the energy saving mode is switched off again.
Terminating the
automatic storage
function prema
turely
Proceed as follows to switch off the automatic storage function before the
adjusted storage duration has expired:
-
1. Press the <STO_> key.
The following window appears.
2. Using <><>, select Yes and confirm with <ENTER>.
The meter switches to the measured value display.
The automatic storage function is terminated.
Editing the data stor-
age
8.3 Measurement data storage
8.3.1 Editing the measured value storage
The contents of the manual or automatic measurement data storage can be
shown on the display and output to the interface.
Each of the measurement data storages has a function to erase the entire
contents.
The storage is edited in the menu, Storage & config / Data storage. To open
the St orage & conf ig menu, press the <F1_>[Menu] key in the measured value
display.
Open the manual or automatic storage directly with the <RCL> or <RCL_> key.
The settings are explained here using the manual storage as an
example. The same settings and functions are available for the
automatic storage.
ba75929e03 12/2011 49
Data storage pH 7310
Manual data storage 3 of 64
30.06.2011 11:24:16 ID number: 2
pH 7.000 24.8 °C AR +++
01.07.2011
08:00
Back USB output
30.06.2011 09:56:20
inoLab pH 7310
Ser. no. 08502113
ID number 2
pH 6.012 24.8 °C, AR, S: +++
________________________________________
30.06.2011 10:56:20
inoLab pH 7310
Ser. no. 08502113
ID number 2
pH 6.012 24.8 °C, AR, S: +++
________________________________________
etc...
Settings
Menu item Setting/
function
Data storage /
- Displays all measurement datasets
Manual data storage /
Display
Data storage /
- Erases the entire manual measure-
Manual data storage /
Erase
Data storage /
- Outputs all stored measurement
Manual data storage /
Output to USB
Description
page by page.
Further options:
Scroll through the datasets with
<><>.
Output the displayed dataset to
the interface with <F2>/[USB
output].
Quit the display with <F1>/
[Back].
ment data storage.
All calibration data remains stored
when this action is performed.
data to the interface.
Display presentation
of a dataset
Representation of a
dataset
(USB output)
50 ba75929e03 12/2011
pH 7310 Data storage
Quitting the display To quit the display of stored measurement datasets, you have the following
options:
Switch directly to the measured value display with <M>.
Quit the display and move to the next higher menu level with <F1>/[Back].
8.3.2 Erasing the measurement data storage
Erasing the measurement data storage (see section 8.3.1 EDITING THE
MEASURED VALUE STORAGE, page 49).
8.3.3 Measurement dataset
A complete dataset consists of:
ID number
Date/time
Measured value of the connected sensor
Measured temperature value of the connected sensor or manually set tem-
perature
AutoRead info: The AR indicator appears with the measured value if the
AutoRead criterion was met while storing (stable measured value). Other-
wise, there is no AR indicator.
Calibration evaluation: +++, ++, +, -, or no evaluation
8.3.4 Storage locations
The pH 7310 meter has two measurement data storages. The measured
values recorded either manually or automatic are stored separately in indi
-
vidual measurement data storages.
Storage Maximum number of datasets
Manual data storage 500
Automatic data storage 5000
ba75929e03 12/2011 51
Transmitting data (USB interface) pH 7310
9 Transmitting data (USB interface)
9.1 Options for data transmission
Via the USB interface you can transmit data to a PC. The following table shows
which data are transmitted to the interface in which way:
Data Control Operation / description
Current
measured values of all connected
sensors
Stored measured values
Calibration
records
Manual With <F2>/[USB output].
Simultaneously with every manual
storage process (see section 8.1
ANUAL STORAGE, page 46).
M
Automatic, at
intervals
With <F2__>/[USB output].
Then you can set the transmission
interval.
Simultaneously with every auto-
matic storage process (see section
UTOMATIC STORAGE AT INTER-
8.2 A
VALS, page 47).
Manual Displayed dataset with <F2>[USB
output] after calling up from the
storage.
All datasets with the Output to USB
function.
(see section 8.3.1 E
MEASURED VALUE STORAGE, page
DITING THE
49).
Manual Calibration record with <F2>/[USB
output]
(see section 5.2.6 C
DATA, page 32).
ALIBRATION
Automatic At the end of a calibration proce-
dure.
The following rule applies: With the exception of the menus, shortly
pressing the <F2>[USB output] key generally outputs the display
contents to the interface (displayed measured values, measurement datasets, calibration records).
52 ba75929e03 12/2011
pH 7310 Transmitting data (USB interface)
9.2 Connecting a PC
Connect the pH 7310 to the PC via the USB interface.
NOTE
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.
Installation o f th e
USB driver on the
PC
System requirements of the PC for installation of the USB driver:
PC with Pentium processor or higher with at least one free USB connection
and CD-ROM drive
Windows 2000, XP, Vista.
1. Insert the supplied installation CD in the CD drive of your PC.
2. Install the driver from the CD.
Follow the Windows installation instructions as necessary.
3. Connect the pH 7310 to the PC via the USB interface.
The meter is listed as a virtual COM interface among the connections in
the Windows instrument manager.
9.3 MultiLab Importer
With the aid of the MultiLab Importer software, you can record and evaluate
measuring data with a PC.
More detailed information can be found in the MultiLab Importer
operating manual.
ba75929e03 12/2011 53
Printer (only pH 7310P) pH 7310
2
1
3
4
10 Printer (only pH 7310P)
1 Operating LED
– Illuminated: Printer is switched on
Switching on the
printer
– Flashing: Printer is switched off
2 Control panel with the keys <ON/FEED> and <OFF>
3 Lever to open the paper compartment
4 Lid of the paper compartment
10.1 Commissioning / switching the printer on or off
1. Connect the power pack to the pH 7310 P.
The LED lights up green. The printer is ready for operation.
or
If the printer was switched off (LED flashing):
Switch on the printer with <OFF>.
The LED lights up green. The printer is ready for operation.
If there is a USB connection (such as to a PC) the data are output
only to the PC.
Switching off the
printer
54 ba75929e03 12/2011
1. Switch off the printer with <OFF>.
The LED flashes. The printer is switched off.
pH 7310 Printer (only pH 7310P)
10.2 Operation / printing
Data are only output to the printer if the following conditions are met
Data are transmitted manually or automatically (see section 9.1 O
FOR DATA TRANSMISSION, page 52)
PTIONS
the printer is switched on (LED illuminated)
there is no USB connection.
10.3 Printer settings
To open the Storage & config menu, press the <F1_>[Menu] key in the mea-
sured value display. After completing the settings, switch to the measured
value display with <M>.
Default settings are printed in bold.
Menu item Possible set-
ting
System / Printer /
Font size
12x20
8x16
7x16
Description
Select the font size for the printer
A print sample (character set of the
printer) to view the available font
sizes can be printed with <OFF_>.
System / Printer /
Print test pag e
- The printer prints the meter informa-
tion from the System / Service infor -
mation menu.
The current printer settings are
used for the printout.
10.4 Maintenance
10.4.1 Changing the roll of paper
1. Pull the lever (3) until the lid (4) of the paper compartment opens.
2. If necessary, remove any remains of the old roll of paper.
3. Insert the new roll of paper. The start of the paper should poke out of the
paper compartment.
4. Close the lid (4) of the paper compartment so that it clicks into place.
5. If necessary, move the printer paper forward with <ON/FEED>.
ba75929e03 12/2011 55
Printer (only pH 7310P) pH 7310
Use original WTW rolls of paper only.
You will find information on this in the WTW catalog LABORATORY
AND FIELD INFORMATION or on the Internet.
The thermal paper will remain legible for at least 7 years if stored
appropriately.
10.5 What to do if... / printer
Cause Remedy
Integrated printer
does not print
– Printer switched off
(LED flashing)
– No power pack connected – Connect the power pack
– USB cable connected – Disconnect the USB cable from the
– Switch on the printer
(LED illuminated)
meter
Printer operating -
paper not being
printed
Integrated printer
prints automatically
– Function "automatic storing at
intervals" with long intervals is
switched on
– Switch off the function (see section
UTOMATIC STORAGE AT INTER-
8.2 A
VALS, page 47)
– No paper available – Insert a roll of paper
Cause Remedy
– Paper inserted the wrong way up – Turn the roll of paper around and
insert it with the other side upwards
Cause Remedy
– The function "Automatic storage
at intervals" or "Transmit data
automatic at intervals" is
switched on
– Switch off the function (see section
8.2 A
UTOMATIC STORAGE AT INTER-
VALS, page 47 or
section 9.1 O
TRANSMISSION, page 52)
PTIONS FOR DATA
56 ba75929e03 12/2011
pH 7310 Maintenance, cleaning, disposal
1
11 Maintenance, cleaning, disposal
11.1 Maintenance
11.1.1 General maintenance activities
The only maintenance activity required is replacing the batteries.
See the relevant operating manuals of the electrodes for instructions on maintenance.
11.1.2 Replacing 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.
2. Remove the four batteries from the battery compartment.
3. Place four new batteries (type Mignon AA) in the battery compartment.
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.
ba75929e03 12/2011 57
Maintenance, cleaning, disposal pH 7310
4. Close the battery compartment (1).
The date (day) flashes on the display.
5. Set the date and time (see section 4.4.6 EXAMPLE 2 ON NAVIGATION:
SETTING THE DATE AND TIME, page 20)
Dispose of used batteries according to the local regulations of your
country.
End users within the European Union are obligated to return used
batteries
set up for recycling
Batteries are marked with the crossed-out waste container
symbol. Therefore, they may not be disposed with the domestic
waste.
(even ecologically compatible ones) to a collection point
purposes.
11.2 Cleaning
Occasionally wipe the outside of the measuring instrument with a damp, lintfree cloth. Disinfect the housing with isopropanol as required.
CAUTION
The housing is made of synthetic material (ABS). Thus, avoid
contact with acetone or similar detergents that contain sol
vents. Remove any splashes immediately.
-
11.3 Packing
This meter is sent out in a protective transport packing.
We recommend: Keep the packing material. The original packing protects the
meter against damage during transport.
11.4 Disposal
At the end of its operational lifetime, the meter must be returned to the
disposal or return system statutory in your country. If you have any questions,
please contact your supplier.
58 ba75929e03 12/2011
pH 7310 What to do if...
12 What to do if...
12.1 pH/ORP
More information and instructions on cleaning and exchange of
sensors are given in the documentation of your sensor.
Error message
OFL, UFL
Error message,
Error
The measured value is outside the measuring range.
Cause Remedy
pH electrode:
– Air bubble in front of the junction – Remove air bubble
– Air in the junction – Extract air or moisten junction
– Cable broken – Replace electrode
– Gel electrolyte dried out – Replace electrode
– Measured value outside the mea-
suring range of the meter
Cause Remedy
pH electrode:
– The values determined for zero
point and slope of the electrode
are outside the allowed limits.
– Use suitable electrode
– Recalibrate
– Junction contaminated – Clean junction
– Electrode broken – Replace electrode
Buffer solutions:
– Wrong buffer solutions – Change calibration procedure
– Buffer solutions too old – Use only once.
Note the shelf life
– Buffer solutions depleted – Change solutions
ba75929e03 12/2011 59
What to do if... pH 7310
No stable measured
Cause Remedy
value
pH electrode:
– Junction contaminated – Clean junction
– Membrane contaminated – Clean membrane
Test sample:
– pH value not stable – Measure with air excluded if
necessary
– Temperature not stable – Temper if necessary
Electrode + test sample:
– Conductivity too low – Use suitable electrode
Obviously incorrect
measured values
– Temperature too high – Use suitable electrode
– Organic liquids – Use suitable electrode
Cause Remedy
pH electrode:
– pH electrode unsuitable – Use suitable electrode
– Temperature difference between
buffer and test sample too great
– Measurement procedure not suit-
– Adjust temperature of buffer or
sample solutions
– Follow special procedure
able
60 ba75929e03 12/2011
pH 7310 What to do if...
12.2 General information
Sensor symbol
flashes
Display
Instrument does not
react to keystroke
You want to know
which so f tware
version is in the
meter
Cause Remedy
– Calibration interval expired – Recalibrate the measuring
Cause Remedy
– Batteries almost empty – Replace the batteries (see
Cause Remedy
– Operating condition undefined or
EMC load unallowed
Cause Remedy
– E. g., a question by the service
department
system
section 11.1 MAINTENANCE,
page 57)
– Processor reset:
Press the <ENTER> and <On/
Off> key simultaneously
– Switch on the meter.
Open the menu, <F1_>/
[Menu] / Storage & config /
SystemService information.
The instrument data are dis
played.
-
ba75929e03 12/2011 61
Technical data pH 7310
13 Technical data
13.1 Measuring ranges, resolution, accuracy
Measuring ranges,
resolution
Parameter M easuring range Resolution
pH -2.0 ... +20.0 0.1
-2.00 ... +20.00 0.01
-2.000 ... +19.999 0.001
U [mV] -1200.0 ... +1200.0 0.1
-2500 ... +2500 1
T [°C] -5.0 ... +105.0 0.1
T [°F] 23.0 ... +221.0 0.1
Manual
temperature input
Parameter Range Increment
T
T
[°C] -25 ... +130 1
manual
[°F] -13 ... +266 1
manual
Accuracy (± 1 digit) Parameter Accuracy Temperature of the test
sample
pH / range *
-2.0 ... +20.0 ± 0.1 +15 °C ... +35 °C
-2.00 ... +20.00 ± 0.01 +15 °C ... +35 °C
-2.000 ... +19.999 ± 0.005 +15 °C ... +35 °C
U [mV] / range
-2500 ... +2500 ± 1 +15 °C ... +35 °C
-1200.0 ... +1200.0 ± 0.3 +15 °C ... +35 °C
T [°C] / temperature sensor
NTC 30 ± 0.1
PT 1000 ± 0.1
* when measuring in a range of ± 2 pH around a calibration point
The accuracy values specified here apply exclusively to the meter.
The accuracy of the
electrodes and buffer solutions has to be taken
into account additionally.
62 ba75929e03 12/2011
pH 7310 Technical data
13.2 General data
Dimensions pH 7310: Approx. 240 x 190 x 80 mm
pH 7310 P: Approx. 290 x 190 x 80 mm
Weight pH 7310: Approx. 0.8 kg
pH 7310 P: Approx. 1.0 kg
Mechanical structure Type of protection IP 43
Electrical safety Protective class III
Test certificates CE, cETLus
Ambient
conditions
Power
supply
Storage -25 °C ... +65 °C
Operation +5 °C ... +55 °C
With the power pack connected:
+5 °C ... +40 °C
Admissible relative
humidity
Yearly mean: < 75 %
30 days/year: 95 %
Other days: 85 %
Batteries 4 x 1.5 V alkali-manganese batteries, type
AA
Rechargeable batteries
4 x 1.2 V NiMH rechargeable batteries,
type
AA
(no charging function)
Operational life Up to 1000 h without / 150 h with illumination
Power pack Kuantech Co. Ltd. KSAC 0900110W1UV-1
Input: 100 ... 240 V ~ / 50 ... 60 Hz / 270 mA
Output: 9 V = / 1.1 A
Connection max. overvoltage category II
Primary plugs contained in the scope of
delivery: Euro, US, UK and Australian.
Sensor input Input resistance > 5 * 10
Input current < 1 * 10
12
-12
ohm
A
USB interface Type USB 1.1
USB B (device), data output
Baud rate Adjustable:
1200, 2400, 4800, 9600, 19200 Baud
Data bits 8
Stop bits 2
Parity None
Handshake RTS/CTS
Cable length max. 3 m
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Technical data pH 7310
FCC Class A Equipment Statement
Note: This equipment has been tested and found to comply with the limits
for a Class A digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely
to cause harmful interference in which case the user will be required to
correct the interference at his own expense.
Changes or modifications not expressly approved by the manufacturer
could void the user‘s authority to operate the equipment.
Guidelines
and norms used
EMC EC directive 2004/108/EC
EN 61326-1
EN 61000-3-2
EN 61000-3-3
FCC Class A
Meter safety EC directive 2006/95/EC
EN 61010-1
IP protection class EN 60529
64 ba75929e03 12/2011
pH 7310 Firmware update
14 Firmware update
Available firmware updates are provided on the Internet.
With the firmware update program and a PC you can update the firmware of the
pH
7310 to the newest version.
For the update you have to connect the meter to a PC.
For the update via the USB interface, the following is required:
a free USB interface (virtual COM port) on the PC
the driver for the USB interface (on the enclosed CD-ROM)
the USB cable (included in the scope of delivery of the pH 7310).
1. Install the downloaded firmware update on a PC.
An update folder is created in the Windows start menu.
If an update folder already exists for the meter (or meter type), the new
data is displayed there.
2. In the windows start menu, open the update folder and start the firmware
update program.
3. Using the USB interface cable, connect the pH 7310 to a USB interface
(virtual COM port) of the PC.
4. Switch on the pH 7310.
5. In the firmware update program, start the update process with OK.
6. Follow the instructions of the firmware update program.
During the programming process, a corresponding message and a
progress bar (in %) are displayed.
The programming process takes approx. three minutes. A terminatory
message is displayed after a successful programming process. The
firmware update is completed.
7. Disconnect the pH 7310 from the PC.
The pH 7310 is ready for operation again.
After switching the meter off and on you can check whether the meter has taken
over the new software version (see
VERSION IS IN THE METER, PAGE 61).
YOU WANT TO KNOW WHICH SOFTWARE
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Firmware update pH 7310
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pH 7310 Glossary
15 Glossary
pH/ORP
Asymmetry see zero point
Electromotive force of
an electrode
Junction The junction is a porous body in the housing wall of reference elec-
ORP voltage The ORP is caused by oxidizing or reducing substances dissolved in
pH value The pH value is a measure of the acidic or basic effect of an aqueous
Potentiometry Name of a measuring technique. The signal (depending on the mea-
The electromotive force U of the combination electrode is the measurable electromotive force of an electrode in a solution. It equals the
sum of all the galvanic voltages of the combination electrode. Its
dependency on the pH results in the electrode function, which is characterized by the parameters, slope and zero point.
trodes or electrolyte bridges. It arranges the electrical contact
between two solutions and makes the electrolyte exchange more difficult. The expression, junction, is also used for ground or junctionless transitions.
water if these substances become effective on an electrode surface
(e. g. a gold or platinum surface).
solution. It corresponds to the negative decadic logarithm of the molal
hydrogen ions activity divided by the unit of the molality. The practical
pH value is the value of a pH measurement.
sured parameter) of the electrode is the electrical potential. The electrical current remains constant.
Slope The slope of a linear calibration function.
Zero point The zero point of a pH combination electrode is the pH value at which
the electromotive force of the pH combination electrode at a specified
temperature is zero. Normally, this is at 25 °C.
General information
Adjusting To manipulate a measuring system so that the relevant value (e. g. the
displayed value) differs as little as possible from the correct value or
a value that is regarded as correct, or that the difference remains
within the tolerance.
AutoRange Name of the automatic selection of the measuring range.
Calibration Comparing the value from a measuring system (e. g. the displayed
value) to the correct value or a value that is regarded as correct.
Often, this expression is also used when the measuring system is
adjusted at the same time (see adjusting).
Measured parameter The measured parameter is the physical dimension determined by
measuring, e. g. pH, conductivity or D.O. concentration.
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Glossary pH 7310
Measured value The measured value is the special value of a measured parameter to
be determined. It is given as a combination of the numerical value and
unit (e. g. 3
m; 0.5 s; 5.2 A; 373.15 K).
Molality Molality is the quantity (in Mol) of a dissolved substance in 1000 g sol-
vent.
Reset Restoring the original condition of all settings of a measuring system.
Resolution Smallest difference between two measured values that can be dis-
played by a meter.
Stability control
Function to control the measured value stability.
(AutoRead )
Standard solution The standard solution is a solution where the measured value is
known.
It is used to calibrate a measuring system.
Temperature function Name of a mathematical function expressing the temperature behav-
ior of a test sample, a sensor or part of a sensor.
Test sample Designation of the test sample ready to be measured. Normally, a test
sample is made by processing the original sample. The test sample
and original sample are identical if the test sample was not processed.
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pH 7310 Index
16 Index
A
Automatic switch-off . . . . . . . . . . . . . . . . . . 16
AutoRead
ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
B
Battery compartment . . . . . . . . . . . . . . 11, 57
C
Calibration
pH . . . . . . . . . . . . . . . . . . . . . . . . . 25, 37
Calibration evaluation
pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Calibration interval . . . . . . . . . . . . . . . . . . . 42
Calibration points
pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Connecting a PC . . . . . . . . . . . . . . . . . . . . 53
D
Dataset . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Date and time . . . . . . . . . . . . . . . . . . . . . . . 20
Default settings
Measured parameter . . . . . . . . . . . . . . 44
System settings . . . . . . . . . . . . . . . . . . 45
Measuring
ORP voltage . . . . . . . . . . . . . . . . . . . . 35
pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Menus (navigation) . . . . . . . . . . . . . . . . . . 17
Messages . . . . . . . . . . . . . . . . . . . . . . . . . 18
P
pH buffer sets . . . . . . . . . . . . . . . . . . . . . . 39
Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Printer (only pH 7310P) . . . . . . . . . . . . . . . 54
R
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
S
Sample display . . . . . . . . . . . . . . . . . . . . . 14
Scope of delivery . . . . . . . . . . . . . . . . . . . . 10
Single-point calibration
pH . . . . . . . . . . . . . . . . . . . . . . . . . 26, 29
Slope
pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Socket field . . . . . . . . . . . . . . . . . . . . . . . . 15
Storage interval . . . . . . . . . . . . . . . . . . . . . 47
Storing in memory . . . . . . . . . . . . . . . . . . . 46
Automatic . . . . . . . . . . . . . . . . . . . . . . 47
Manual . . . . . . . . . . . . . . . . . . . . . . . . 46
E
Energy saving mode . . . . . . . . . . . . . . . . . 48
F
Firmware update . . . . . . . . . . . . . . . . . . . . 65
I
Initial commissioning . . . . . . . . . . . . . . . . . 10
Initialize . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Interval for calibration . . . . . . . . . . . . . . . . . 42
K
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
M
Measured value display . . . . . . . . . . . . . . . 16
Measurement accuracy . . . . . . . . . . . . . . . 42
Measurement data storage
Edit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Erase . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Measurement dataset . . . . . . . . . . . . . . . . 51
T
Temperature measurement
pH . . . . . . . . . . . . . . . . . . . . . . . . . 24, 37
Three-point calibration
pH . . . . . . . . . . . . . . . . . . . . . . . . . 27, 30
Transmitting data . . . . . . . . . . . . . . . . . . . 52
automatic . . . . . . . . . . . . . . . . . . . . . . . 52
manual . . . . . . . . . . . . . . . . . . . . . . . . 52
Transmitting measured values . . . . . . . . . 52
Two-point calibration
pH . . . . . . . . . . . . . . . . . . . . . . . . . 26, 29
Z
Zero point of pH combination electrode . . 25
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Index pH 7310
70 ba75929e03 12/2011
Wissenschaftlich-Technische Werkstätten GmbH
Dr.-Karl-Slevogt-Straße 1
D-82362 Weilheim
Germany
Tel: +49 (0) 881 183-0
+49 (0) 881 183-100
Fax: +49 (0) 881 183-420
E-Mail: Info@WTW.com
Internet: http://www.WTW.com
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