Xylem 7110 User Manual
pH 7110
Operating manual
ba75925e02 12/2011
pH meter
pH 7110
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.
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pH 7110 Contents
pH 7110 - Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 pH 7110 meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3.2 Connecting the power pack. . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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
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Contents pH 7110
4.1.3 Status information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.4 Socket field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 Switching on the meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3 Switching off the meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4 Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.2 Measuring mode (measured value display) . . . . . . . . . . . . . . 16
4.4.3 Setting mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5 pH value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 Measuring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1.1 Measuring the pH value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1.2 Measuring the temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2.1 Why calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2.2 When to calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2.3 Automatic calibration (AutoCal) . . . . . . . . . . . . . . . . . . . . . . . 20
5.2.4 Manual calibration (ConCal) . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.2.5 Calibration points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.2.6 Calibration data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6 ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.1 Measuring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.1.1 Measuring the ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.1.2 Measuring the temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.2 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1 Measurement settings (pH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1.1 Changing the settings for pH measurements. . . . . . . . . . . . . 29
7.1.2 Buffer sets for calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.1.3 Calibration interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.2 Measurement settings (ORP). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.2.1 Changing the settings for ORP measurements . . . . . . . . . . . 31
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pH 7110 Contents
7.3 Sensor-independent settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.3.1 Changing the sensor-independent settings . . . . . . . . . . . . . . 32
7.3.2 Energy saving (battery operation) . . . . . . . . . . . . . . . . . . . . . 32
8 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.1 Resetting the calibration values . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.2 Resetting the measurement and system settings . . . . . . . . . . . . . 34
9 Maintenance, cleaning, disposal. . . . . . . . . . . . . 36
9.1 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9.1.1 General maintenance activities . . . . . . . . . . . . . . . . . . . . . . . 36
9.1.2 Replacing the batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.3 Packing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
10 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10.1 pH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10.1.1 No stable measured value . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10.1.2 Error message CalError . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10.1.3 Error message OFL, UFL. . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10.2 ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10.2.1 No stable measured value . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10.2.2 Error message OFL, UFL. . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
10.3 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
10.3.1 Symbol for calibration evaluation flashes. . . . . . . . . . . . . . . . 40
10.3.2 [LoBat] display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
10.3.3 Instrument does not react to keystroke . . . . . . . . . . . . . . . . . 41
10.3.4 Displaying the software version (meter). . . . . . . . . . . . . . . . . 41
11 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
11.1 Measuring ranges, resolution, accuracy. . . . . . . . . . . . . . . . . . . . . 42
11.1.1 Measuring ranges, resolution. . . . . . . . . . . . . . . . . . . . . . . . . 42
11.1.2 Manual temperature input . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
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Contents pH 7110
11.1.3 Accuracy (± 1 digit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
11.2 General data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
12 Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
12.1 pH/ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
12.2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
13 Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
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pH 7110 Overview
1
2
3
1Overview
1.1 pH 7110 meter
The pH 7110 compact digital precision meter enables you to perform pH and
ORP measurements quickly and reliably.
The pH 7110 provides the maximum degree of operating comfort, reliability and
measuring certainty for all applications.
1 Keypad
2Display
3 Socket field
1.2 Sensors
A measuring system ready to measure consists of the pH 7110 meter and a
suitable sensor.
The pH 7110 can be operated with the following sensors:
• pH electrode
• ORP electrode
Information on available sensors is given on the Internet and in the
WTW catalog, "Laboratory and field instrumentation".
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Safety pH 7110
2 Safety
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 information 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 situation that can lead to
serious (irreversible) i njury or death if the safety inst ruction is
not followed.
CAUTION
indicates a possibly dangerous situation that can lead to
slight (reversible) injury if the safety instruction is not
followed.
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 7110 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 in this operating manual is authorized (see
section 11 T
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).
ECHNICAL DATA, page 42).
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 11 T
ECHNICAL DATA, page 42).
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Commissioning pH 7110
3 Commissioning
3.1 Scope of delivery
• pH 7110 meter
• 4 batteries 1.5 V Mignon type AA
• Power pack
• Stand
• Stand holder
• Short instructions
• Detailed operating manual (4 languages)
• CD-ROM with detailed operating manual
3.2 Power supply
The pH 7110 is supplied with power in the following ways:
• Mains operation with the supplied power pack.
• Battery operation (4 x alkaline manganese batteries, type AA)
3.3 Initial commissioning
Perform the following activities:
• Insert the supplied batteries
• Connect the power pack (mains operation)
• Mount the stand
• Switch on the meter
(see section 4.2 S
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.
WITCHING ON THE METER, page 15)
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pH 7110 Commissioning
2
1. Open the battery compartment (2) on the underside of the meter.
2. Insert four batteries 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.
3. Close the battery compartment tightly.
When the batteries are nearly empty, the [LoBat] status indicator is
displayed.
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 section 11 T
NICAL DATA, page 42).
ECH-
CAUTION
Use original power packs only (see section 11 T
ECHNICAL DATA,
page 42).
1. Connect the plug of the power pack to the socket for the power pack on
the pH 7110.
2. Connect the original power pack to an easily accessible power outlet.
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Commissioning pH 7110
1
2
3.3.3 Mounting the stand
The stand base can be mounted at the right side of the meter.
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pH 7110 Operation
4Operation
4.1 General operating principles
This section contains basic information on the operation of the pH 7110.
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__>).
Key Symbol Meaning
<On/Off>
<On/Off__>
<M>
<M__>
<CAL>
<CAL__>
<><>
<__><__>
<ENTER>
<ENTER__>
Switches the meter on or off
Resets calibration data
Selects the measured parameter
Opens the measurement settings
Calls up the calibration procedure
Displays the calibration data
Increments, decrements values
Increments, decrements values continuously
Confirms entries
Opens the menu for system settings
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Operation pH 7110
8
88
8
8
1
8
8
8
°
C
°F
UpH
mV/pH
LoBat
AutoCal DIN
AutoCal TEC ConCal AR
TP
CalError
%
Time
3
2
4
5
1
4.1.2 Display
1 Status information
2 Measured value (with unit)
3 Measured parameter
4 Sensor symbol (calibration evaluation, calibration interval)
5 Measured temperature (with unit)
4.1.3 Status information
Display Meaning
[AutoCal TEC]
[AutoCal DIN]
[ConCal] Calibration with any buffers
[CalError] An error occurred during calibration
[AR] Stability control (AutoRead) is active
[TP] Temperature measurement active
Calibration with automatic buffer recognition, e.g. with the
buffer set: Technical buffers
[Time] Setting of calibration interval
[LoBat] Batteries are almost empty
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pH 7110 Operation
1
2
3
4
5
8
4
2
2
9
9
6
pH
°
C
TP
AR
4.1.4 Socket field
1 pH electrode
2 Reference electrode
3 Temperature sensor
4 Power pack
5 Service interface
4.2 Switching on the meter
1. Switch on the meter with <On/Off>.
The meter performs a self-test.
The meter switches to the measuring mode (measured value display).
2. Connect the sensor.
The meter is ready to measure.
4.3 Switching off the meter
1. Switch off the meter with <On/Off>.
The meter is switched off.
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Operation pH 7110
When the meter is powered by the batteries, it switches itself off
automatically after an adjustable interval to save the batteries (see
section Automatic switch-off function, page 32).
4.4 Navigation
4.4.1 Operating modes
The meter has the following operating modes:
Operating mode Description
Measuring The measurement data of the connected sensor are
shown in the measured value display
Calibration The course of a calibration with calibration informa-
tion, functions and settings is displayed
Transmitting data The meter transmits measuring data and calibration
records to a USB-B interface automatically or manually.
Setting A setting is displayed.
4.4.2 Measuring mode (measured value display)
The following functions are available in the measuring mode (measured value
display):
• Change the display in the selected measuring window (e. g. pH <-> mV) by
pressing <M>
• To open the measurement settings, press <M__> (long pressure).
• To open the system settings, press <ENTER__> (long pressure).
4.4.3 Setting mode
The following functions are available in the setting mode:
• To change the current setting, press <><>.
• Confirm the setting with <ENTER>.
The next setting is displayed.
The settings are stored.
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