wtw Cond 7110 User manual

ba75927e03 04/2012
Cond 7110
Operating manual
Conductivity meter

Cond 7110
2 ba75927e03 04/2012
Copyright ©Weilheim 2012, WTW GmbH
Reproduction in whole - or even in part - is prohibited without the express
written permission of WTW GmbH, Weilheim.
Printed in Germany.

Cond 7110 - Contents
Cond 7110 Contents
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1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 Cond 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

Contents Cond 7110
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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 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1 Measuring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1.1 Measuring the conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1.2 Measuring the temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2.1 Why calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2.2 When to calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2.3 Determining the cell constant (calibration in control standard) 19
5.2.4 Using the last calibrated cell constant . . . . . . . . . . . . . . . . . . 20
5.2.5 Setting the cell constant manually . . . . . . . . . . . . . . . . . . . . . 21
5.2.6 Calibration data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.1 Measurement settings (conductivity) . . . . . . . . . . . . . . . . . . . . . . . 24
6.1.1 Changing the settings for conductivity measurements . . . . . 24
6.1.2 Cleaning interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.1.3 Selecting the temperature compensation . . . . . . . . . . . . . . . 25
6.1.4 Setting the TDS factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.2 Sensor-independent settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.2.1 Changing the sensor-independent settings . . . . . . . . . . . . . . 27
6.2.2 Energy saving (battery operation) . . . . . . . . . . . . . . . . . . . . . 27
7 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.1 Erasing the calibration values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.2 Resetting the measurement and system settings . . . . . . . . . . . . . 28

Cond 7110 Contents
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8 Maintenance, cleaning, disposal. . . . . . . . . . . . . 30
8.1 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.1 General maintenance activities . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.2 Replacing the batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.3 Packing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
9 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9.1 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9.1.1 Error message E3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9.1.2 Error message OFL, UFL. . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9.2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9.2.1 [LoBat] Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9.2.2 Instrument does not react to keystroke . . . . . . . . . . . . . . . . . 33
9.2.3 Displaying the software version (meter). . . . . . . . . . . . . . . . . 33
10 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.1 Measuring ranges, resolution, accuracy. . . . . . . . . . . . . . . . . . . . . 34
10.1.1 Measuring ranges, resolution. . . . . . . . . . . . . . . . . . . . . . . . . 34
10.1.2 Cell constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10.1.3 Reference temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10.1.4 Accuracy (± 1 digit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10.2 General data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
11 Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
11.1 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
11.2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
12 Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Contents Cond 7110
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Cond 7110 Overview
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1Overview
1.1 Cond 7110 meter
The Cond 7110 compact digital precision meter enables you to perform
conductivity measurements quickly and reliably.
The Cond 7110 provides the maximum degree of operating comfort, reliability
and measuring certainty for all applications.
1.2 Sensors
A measuring system ready to measure consists of the Cond 7110 meter and a
suitable sensor.
Suitable sensors are conductivity measuring cells.
1 Keypad
2Display
3 Socket field
1
2
3
Information on available sensors is given on the Internet and in the
WTW catalog, "Laboratory and field instrumentation".

Safety Cond 7110
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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 infor-
mation you need.
Important safety instructions are highlighted in this operating manual. They are
indicated by the warning symbol (triangle) in the left column. The signal word
(e.g. "CAUTION") indicates the level of danger:
NOTE
indicatesapossiblydangerous situation where goods might be damaged
if the actions mentioned are not taken.
2.1.2 Safety signs on the meter
Note all labels, information signs and safety symbols on the meter and in the
battery compartment. A warning symbol (triangle) without text refers to safety
information in this operating manual.
2.1.3 Further documents providing safety information
The following documents provide additional information, which you should
observe for your safety when working with the measuring system:
• Operating manuals of sensors and other accessories
• Safety datasheets of calibration or maintenance accessories (such as buffer
solutions, electrolyte solutions, etc.)
WARNING
indicates a possibly dangerous situation that can lead to
serious (irreversible) injury or death if the safety instruction is
not followed.
CAUTION
indicates a possibly dangerous situation that can lead to
slight (reversible) injury if the safety instruction is not
followed.

Cond 7110 Safety
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2.2 Safe operation
2.2.1 Authorized use
This meter is authorized exclusively for conductivity measurements in the labo-
ratory.
Only the operation and running of the meter according to the instructions and
technical specifications given in this operating manual is authorized (see
section 10 TECHNICAL DATA, page 34).
Any other use is considered unauthorized.
2.2.2 Requirements for safe operation
Note the following points for safe operation:
• The meter may only be operated according to the authorized use specified
above.
• The meter may only be supplied with power by the energy sources
mentioned in this operating manual.
• The meter may only be operated under the environmental conditions
mentioned in this operating manual.
• The meter may only be opened if this is explicitly described in this operating
manual (example: Inserting the batteries).
2.2.3 Unauthorized use
The meter must not be put into operation if:
• it is visibly damaged (e.g. after being transported)
• it was stored under adverse conditions for a lengthy period of time (storing
conditions, see section 10 TECHNICAL DATA, page 34).

Commissioning Cond 7110
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3 Commissioning
3.1 Scope of delivery
• Cond 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 Cond 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 SWITCHING ON THE METER, page 15)
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.