Metrohm 912 User manual

pH Meter/Conductometer
912 Conductometer | 913 pH Meter | 914 pH/Conductometer
Manual
8.912.8001EN / 2016-11-11

Metrohm AG
CH-9100 Herisau
Switzerland
Phone [phone]
Fax [phone]
[email protected]
www.metrohm.com
pH Meter/Conductometer
912 Conductometer | 913 pH Meter |
914 pH/Conductometer
Manual
8.912.8001EN / 2016-11-11 fpe

Technische Dokumentation
Metrohm AG
CH-9100 Herisau
[email protected]
This documentation is protected by copyright. All rights reserved.
This documentation has been prepared with great care. However, errors
can never be entirely ruled out. Please send comments regarding possible
errors to the address above.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of contents
pH Meter/Conductometer ￭￭￭￭￭￭￭￭ III
Table of contents
1 Introduction 1
1.1 Instrument description ......................................................... 1
1.1.1 Instrument and sales versions .................................................. 2
1.1.2 Power supply ........................................................................... 2
1.1.3 Interfaces ................................................................................ 3
1.1.4 Sensors .................................................................................... 3
1.2 Intended use ......................................................................... 3
1.3 About the documentation ................................................... 3
1.3.1 Symbols and conventions ........................................................ 3
1.4 Safety instructions ................................................................ 4
1.4.1 General notes on safety ........................................................... 4
1.4.2 Electrical safety ........................................................................ 5
1.4.3 Flammable solvents and chemicals ........................................... 5
1.4.4 Recycling and disposal ............................................................. 6
2 Overview of the instrument 7
2.1 Instrument connectors ......................................................... 8
2.1.1 912 Conductometer ................................................................ 8
2.1.2 913 pH Meter .......................................................................... 8
2.1.3 914 pH/Conductometer IS ....................................................... 9
2.1.4 914 pH/Conductometer ........................................................... 9
2.2 Application environment ................................................... 10
2.2.1 Laboratory use ....................................................................... 10
2.2.2 Mobile application ................................................................. 11
3 Installation 12
3.1 Unpacking and inspecting the instrument ....................... 12
3.1.1 Packaging .............................................................................. 12
3.1.2 Checks .................................................................................. 12
3.1.3 Application area .................................................................... 12
3.2 Power supply ...................................................................... 12
3.2.1 Charging the accumulator ..................................................... 13
3.2.2 Operation with power supply unit ......................................... 14
3.2.3 Operation via USB connector (PC) .......................................... 15
3.3 Connecting sensors ............................................................ 15
3.4 Connecting a printer .......................................................... 16
3.5 Initial configuration ............................................................ 17
3.5.1 Setting the Language ............................................................. 17
3.5.2 Setting the date and time ...................................................... 18

Table of contents ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
IV ￭￭￭￭￭￭￭￭ pH Meter/Conductometer
4 Operation 20
4.1 Switching the instrument on and off ............................... 20
4.2 Displays ............................................................................... 20
4.3 Status displays .................................................................... 23
4.3.1 Accumulator status ................................................................ 23
4.3.2 User rights ............................................................................. 23
4.3.3 Sensor quality for pH electrodes ............................................ 24
4.4 Control keys ........................................................................ 24
4.5 Basic operation ................................................................... 25
4.5.1 Main dialog with two measuring channels ............................. 25
4.5.2 Main dialog with one measuring channel ............................... 26
4.5.3 Operation in the main dialog ................................................. 27
4.5.4 Menu dialog .......................................................................... 28
4.5.5 Editing dialog ........................................................................ 29
4.5.6 Selection dialog ..................................................................... 31
4.5.7 Changing the user ................................................................. 32
4.6 Menu structures .................................................................. 33
4.6.1 912 Conductometer .............................................................. 34
4.6.2 913 pH Meter ........................................................................ 35
4.6.3 914 pH/Conductometer IS ..................................................... 36
4.6.4 914 pH/Conductometer ......................................................... 37
4.7 Menu dialogs ...................................................................... 38
4.7.1 Parameters pH/U/T and Parameters pH/U/T IS ........................ 38
4.7.2 Parameters Κ/TDS/Sal/ρ/T ...................................................... 39
4.7.3 Measured values .................................................................... 40
4.7.4 Sensors .................................................................................. 42
4.7.5 Report ................................................................................... 47
4.7.6 Configuration ........................................................................ 48
4.7.7 User ...................................................................................... 49
4.8 pH measurement ................................................................ 50
4.8.1 pH electrode calibration ......................................................... 50
4.8.2 Measurement ........................................................................ 52
4.9 Conductivity measurement ................................................ 53
4.9.1 Determination of the cell constant (calibration) ...................... 53
4.9.2 Measurement ........................................................................ 54
4.10 Issuing reports/measured values ....................................... 56
4.10.1 Printing out ........................................................................... 56
4.10.2 PC/LIMS and CSV data transfer .............................................. 56
5 Operation and maintenance 59
5.1 General notes ...................................................................... 59
5.1.1 Care ...................................................................................... 59
5.1.2 Maintenance by Metrohm Service .......................................... 59
5.1.3 Sensor care ............................................................................ 59

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of contents
pH Meter/Conductometer ￭￭￭￭￭￭￭￭ V
5.2 Quality management and qualification with Metrohm .. 60
6 Troubleshooting 61
6.1 General ................................................................................ 61
6.2 Problems ............................................................................. 62
6.2.1 Troubleshooting .................................................................... 62
6.3 Restarting/resetting the instrument ................................. 64
6.3.1 Instrument reset .................................................................... 64
6.3.2 Resetting the instrument to factory settings ........................... 64
6.4 Messages ............................................................................. 65
7 Appendix 66
7.1 Saved buffer series ............................................................. 66
7.1.1 Metrohm ............................................................................... 67
7.1.2 NIST (according to DIN standard 19266, 2000) ...................... 68
7.1.3 DIN (according to DIN standard 19267, 2012) ....................... 69
7.1.4 Fisher .................................................................................... 70
7.1.5 Mettler Toledo ....................................................................... 71
7.1.6 Merck CertiPUR 20 / Titrisol ................................................... 72
7.1.7 Merck CertiPUR 25 ................................................................ 73
7.1.8 Beckmann ............................................................................. 74
7.1.9 Radiometer Analytical ............................................................ 75
7.1.10 Baker ..................................................................................... 76
7.1.11 Hamilton DURACAL ............................................................... 77
7.1.12 Fluka ..................................................................................... 78
8 Technical specifications 79
8.1 Measuring inputs ................................................................ 79
8.2 Measured value memory ................................................... 80
8.3 TFT display .......................................................................... 80
8.4 Interfaces ............................................................................. 80
8.5 Power supply ...................................................................... 80
8.6 Charging time ..................................................................... 81
8.7 Runtime with accumulator ................................................ 81
8.8 Housing specification ......................................................... 82
8.9 Safety specification ............................................................ 82
8.10 Electromagnetic compatibility (EMC) ................................ 82
8.11 Ambient temperature ......................................................... 83
8.12 Reference conditions .......................................................... 83
8.13 Dimensions/material ........................................................... 83

Table of contents ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
VI ￭￭￭￭￭￭￭￭ pH Meter/Conductometer
9 Accessories 84
Glossary 85
Index 86

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of figures
pH Meter/Conductometer ￭￭￭￭￭￭￭￭ VII
Table of figures
Figure 1 pH Meter/Conductometer - front ...................................................... 7
Figure 2 912 Conductometer - connectors ...................................................... 8
Figure 3 913 pH Meter - connectors ............................................................... 8
Figure 4 914 pH/Conductometer (digital) - connectors .................................... 9
Figure 5 914 pH/Conductometer (analog) - connectors ................................... 9
Figure 6 pH Meter/Conductometer in a laboratory setup ............................... 10
Figure 7 pH Meter/Conductometer for mobile application ............................. 11
Figure 8 USB Y cable ..................................................................................... 17
Figure 9 View - main dialog .......................................................................... 21
Figure 10 View - menu dialog ......................................................................... 21
Figure 11 View - editing dialog ....................................................................... 22
Figure 12 View - selection dialog .................................................................... 22
Figure 13 Operation - main dialog, two-channel ............................................. 26
Figure 14 Operation - main dialog, one-channel ............................................. 27
Figure 15 Operation - menu dialog ................................................................. 29
Figure 16 Operation - editing dialog ............................................................... 30
Figure 17 Operation - selection dialog ............................................................. 31
Figure 18 Example of a message ..................................................................... 65

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
pH Meter/Conductometer ￭￭￭￭￭￭￭￭ 1
1 Introduction
This manual gives you a comprehensive overview of the installation, func-
tioning and operation of pH Meter/Conductometer.
NOTE
You can request application descriptions in the form of
Application Notes and Application Bulletins from your
Metrohm representative or download them from
http://www.metrohm.com.
1.1 Instrument description
pH Meter/Conductometers are designed for use both outdoors and
indoors as well as for stationary use in the laboratory.
The instruments come in four basic versions, which differ in their design
with regard to different measuring channels and respective functions.
912 Conductometer With a measuring channel for measuring conductivity, TDS and salinity.
913 pH Meter With an analog and a digital measuring channel each for measuring pH,
potential and temperature.
914 pH/Conducto-
meter IS
With a digital measuring channel for measuring pH, potential and temper-
ature and a measuring channel for measuring conductivity, TDS, salinity
and temperature.
914 pH/Conducto-
meter
With an analog measuring channel for measuring pH, potential and tem-
perature and a measuring channel for measuring conductivity, TDS, salin-
ity and temperature.
The pH/Conductometers are equipped with a permanently installed accu-
mulator for mobile use.
For stationary use in the laboratory, the instrument can be connected to
the power supply with a dedicated power supply unit.

1.1 Instrument description ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
2￭￭￭￭￭￭￭￭ pH Meter/Conductometer
1.1.1 Instrument and sales versions
pH Meter/Conductometers are available in the following versions:
Table 1 Instrument versions
2.912.0010 912 Conductometer Instrument with standard
accessories
2.912.0110 912 Conductometer Mobile version with acces-
sories case
2.912.0210 912 Conductometer Laboratory version with
stand plate
2.913.0010 913 pH Meter (digital/analog) Instrument with standard
accessories
2.913.0110 913 pH Meter (digital/analog) Mobile version with acces-
sories case
2.913.0210 913 pH Meter (digital/analog) Laboratory version with
stand plate
2.914.0010 914 pH/Conductometer (pH digital) Instrument with standard
accessories
2.914.0020 914 pH/Conductometer (pH analog) Instrument with standard
accessories
2.914.0110 914 pH/Conductometer (pH digital) Mobile version with acces-
sories case
2.914.0120 914 pH/Conductometer (pH analog) Mobile version with acces-
sories case
2.914.0210 914 pH/Conductometer (pH digital) Laboratory version with
stand plate
2.914.0220 914 pH/Conductometer (pH analog) Laboratory version with
stand plate
NOTE
The accessories for a given instrument version can be viewed as a PDF
list on the Internet at http://partslists.metrohm.com.
1.1.2 Power supply
The instrument is powered either by a built-in accumulator or, for station-
ary use, by a power supply unit.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
pH Meter/Conductometer ￭￭￭￭￭￭￭￭ 3
1.1.3 Interfaces
You can connect a printer or establish a connection with a PC for data
transfer (PC/LIMS report and CSV format) using the USB interface.
1.1.4 Sensors
Metrohm offers various sensors for specific measurements.
NOTE
For more information on the basic theoretical principles, please refer to
the Metrohm monograph Electrodes in Potentiometry.
1.2 Intended use
This instrument is suitable for making measurements in chemicals and
flammable samples. Therefore, using the pH Meter/Conductometer
requires the user to have basic knowledge and experience in handling
toxic and caustic substances. Knowledge of the application of the fire pro-
tection measures prescribed for laboratories is also mandatory.
1.3 About the documentation
CAUTION
Please read through this documentation carefully before putting the
instrument into operation. The documentation contains information
and warnings which the user must follow in order to ensure safe opera-
tion of the instrument.
1.3.1 Symbols and conventions
The following symbols and formatting may appear in this documentation:
Cross-reference to figure legend
The first number refers to the figure number, the sec-
ond to the instrument part in the figure.
Instruction step
Carry out these steps in the sequence shown.
Method Dialog text, parameter in the software

1.4 Safety instructions ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
4￭￭￭￭￭￭￭￭ pH Meter/Conductometer
File ▶ New Menu or menu item
[Next] Button or key
WARNING
This symbol draws attention to a possible life-threat-
ening hazard or risk of injury.
WARNING
This symbol draws attention to a possible hazard due
to electrical current.
WARNING
This symbol draws attention to a possible hazard due
to heat or hot instrument parts.
WARNING
This symbol draws attention to a possible biological
hazard.
CAUTION
This symbol draws attention to possible damage to
instruments or instrument parts.
NOTE
This symbol highlights additional information and
tips.
1.4 Safety instructions
1.4.1 General notes on safety
WARNING
This instrument may only be operated in accordance with the specifica-
tions in this documentation.
This instrument has left the factory in a flawless state in terms of technical
safety. To maintain this state and ensure non-hazardous operation of the
instrument, the following instructions must be observed carefully.

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pH Meter/Conductometer ￭￭￭￭￭￭￭￭ 5
1.4.2 Electrical safety
Electrical safety when working with the instrument is ensured in compli-
ance with international standard IEC 61010.
WARNING
Only personnel qualified by Metrohm are authorized to carry out service
work on electronic components.
WARNING
Never open the housing of the instrument. The instrument could be
damaged.
There are no parts inside the housing which can be serviced or replaced
by the user.
Accumulator / power supply unit
WARNING
Only use the power supply unit for its intended purpose. Inappropriate
use or use of non-approved or incompatible power supply units may
cause fires and result in the revocation of the guarantee or warranty.
If you think that the accumulator or the power supply unit has been
damaged, have it checked by a service center. Do not use damaged
accumulators or power supply units.
Do not use the power supply unit outdoors.
1.4.3 Flammable solvents and chemicals
WARNING
All relevant safety measures are to be observed when working with
flammable solvents and chemicals.
￭Set up the instrument in a well-ventilated location (e.g. fume cup-
board).
￭Keep all sources of flame far from the workplace.
￭Clean up spilled liquids and solids immediately.
￭Follow the safety instructions of the chemical manufacturer.

1.4 Safety instructions ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
6￭￭￭￭￭￭￭￭ pH Meter/Conductometer
1.4.4 Recycling and disposal
This product is covered by European Directive 2002/96/EC, WEEE – Waste
from Electrical and Electronic Equipment.
The correct disposal of your old equipment will help to prevent negative
effects on the environment and public health.
More details about the disposal of your old equipment can be obtained
from your local authorities, from waste disposal companies or from your
local dealer.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 2 Overview of the instrument
pH Meter/Conductometer ￭￭￭￭￭￭￭￭ 7
2 Overview of the instrument
Figure 1 pH Meter/Conductometer - front
1Connectors / interfaces
With a cover cap for the USB interface and
the digital interface.
2Sensor holder slot
For mobile applications, a sensor holder may
be inserted here.
3Display
For measured values and menus (see Chap-
ter 4.2, page 20).
4Keypad
With a total of eight keys to operate the
instrument (see Chapter 4.4, page 24).
5Eyelet for carrying strap
As accessory for mobile applications.

2.1 Instrument connectors ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
8￭￭￭￭￭￭￭￭ pH Meter/Conductometer
2.1 Instrument connectors
2.1.1 912 Conductometer
Figure 2 912 Conductometer - connectors
1Conductivity measuring cell
Connection socket for conductivity measur-
ing cells.
2Type B mini USB connector
Connection socket for power supply, data
transmission and printing.
2.1.2 913 pH Meter
Figure 3 913 pH Meter - connectors
1pH/mV electrode
Connection socket for analog pH/mV elec-
trodes.
2Temperature sensor / reference
3pH/mV electrode
Connection socket for 854 iConnect for
connecting iTrodes.
4Type B mini USB connector
Connection socket for power supply, data
transmission and printing.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 2 Overview of the instrument
pH Meter/Conductometer ￭￭￭￭￭￭￭￭ 9
2.1.3 914 pH/Conductometer IS
Figure 4 914 pH/Conductometer (digital) - connectors
1Conductivity measuring cell
Connection socket for conductivity measur-
ing cells.
2pH/mV electrode
Connection socket for 854 iConnect for
connecting iTrodes.
3Type B mini USB connector
Connection socket for power supply, data
transmission and printing.
2.1.4 914 pH/Conductometer
Figure 5 914 pH/Conductometer (analog) - connectors
1pH/mV electrode
Connection socket for analog pH/mV elec-
trodes.
2Temperature sensor / reference
3Conductivity measuring cell
Connection socket for conductivity measur-
ing cells.
4Type B mini USB connector
Connection socket for power supply, data
transmission and printing.

2.2 Application environment ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
10 ￭￭￭￭￭￭￭￭ pH Meter/Conductometer
2.2 Application environment
pH Meter/Conductometer instruments have been designed for use in
laboratories and for mobile use indoors or outdoors.
The sturdy design meets the requirements in accordance with IP 67 pro-
tection marking. The instruments are therefore protected against short-
time immersion in water, provided that the respective plugs are plugged in
at the sensor connectors.
2.2.1 Laboratory use
In the laboratory, pH Meter/Conductometer instruments can be placed
in an instrument base console.
Figure 6 pH Meter/Conductometer in a laboratory setup
1Electrode holder 2Clamping ring
3Instrument base console
Consisting of receptacle base and support
rod.