Metrohm 912 User manual

912/913/914 Meter
Manual
8.912.8001EN / 2020-01-22

Metrohm AG
CH-9100 Herisau
Switzerland
Phone [phone]
Fax [phone]
[email protected]
www.metrohm.com
912/913/914 Meter
Manual
8.912.8001EN / 2020-01-22

Technical Communication
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
912/913/914 Meter ￭￭￭￭￭￭￭￭ III
Table of contents
1 Introduction 1
1.1 Instrument description ......................................................... 1
1.1.1 Instrument versions and sales versions ..................................... 2
1.1.2 Energy supply .......................................................................... 2
1.1.3 Interfaces ................................................................................ 2
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 ........................................................................ 4
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 ......................................................... 7
2.1.1 912 Conductometer ................................................................ 7
2.1.2 913 pH Meter | 913 pH/DO Meter ........................................... 8
2.1.3 914 pH/DO/Conductometer ..................................................... 8
2.1.4 914 pH/Conductometer ........................................................... 9
2.2 Application environment ...................................................... 9
2.2.1 Laboratory use ......................................................................... 9
2.2.2 Mobile application ................................................................. 10
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 Energy supply ...................................................................... 12
3.2.1 Charging the battery .............................................................. 14
3.2.2 Operation with power supply unit .......................................... 15
3.2.3 Operation via USB connector (PC) .......................................... 15
3.3 Connecting sensors ............................................................ 16
3.4 Disconnecting sensors ........................................................ 16
3.5 Connecting a printer .......................................................... 17
3.6 Initial configuration ............................................................ 18
3.6.1 Setting the Language ............................................................. 18
3.6.2 Setting the date and time ...................................................... 19

Table of contents ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
IV ￭￭￭￭￭￭￭￭ 912/913/914 Meter
4 Operation 21
4.1 Switching the instrument on and off ................................ 21
4.2 Displays ............................................................................... 21
4.3 Status displays .................................................................... 25
4.3.1 Rechargeable battery status ................................................... 25
4.3.2 User rights ............................................................................. 25
4.3.3 Sensor quality for pH electrodes ............................................. 25
4.3.4 Sensor status for DO sensors ................................................. 26
4.4 Control keys ........................................................................ 26
4.5 Basic operation ................................................................... 27
4.5.1 Main dialog with two measuring channels ............................. 27
4.5.2 Main dialog with one measuring channel ............................... 30
4.5.3 Operation in the main dialog ................................................. 31
4.5.4 Menu dialog .......................................................................... 32
4.5.5 Editing dialog ........................................................................ 33
4.5.6 Selection dialog ..................................................................... 34
4.5.7 Changing the user ................................................................. 35
4.6 Menu structures .................................................................. 36
4.6.1 912 Conductometer .............................................................. 37
4.6.2 913 pH Meter ........................................................................ 38
4.6.3 913 pH/DO Meter ................................................................. 39
4.6.4 914 pH/Conductometer ......................................................... 40
4.6.5 914 pH/DO/Conductometer ................................................... 41
4.7 Menu dialogs ...................................................................... 42
4.7.1 Parameters pH/U/T and Parameters pH/U/T IS ......................... 42
4.7.2 Parameters Κ/TDS/Sal/ρ/T ...................................................... 43
4.7.3 Parameters DO ...................................................................... 44
4.7.4 Measured values .................................................................... 46
4.7.5 Sensors .................................................................................. 48
4.7.6 Report ................................................................................... 55
4.7.7 Configuration ........................................................................ 56
4.7.8 User ...................................................................................... 57
4.8 pH measurement ................................................................ 58
4.8.1 pH electrode calibration ......................................................... 58
4.8.2 Measurement ........................................................................ 60
4.9 Conductivity measurement ................................................ 61
4.9.1 Determination of the cell constant (calibration) ...................... 61
4.9.2 Measurement ........................................................................ 62
4.10 Oxygen measurement ........................................................ 64
4.10.1 Calibration ............................................................................. 64
4.10.2 Measurement ........................................................................ 65
4.11 Issuing reports/measured values ....................................... 66
4.11.1 Printing out ........................................................................... 66
4.11.2 PC/LIMS and CSV data transfer .............................................. 67

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of contents
912/913/914 Meter ￭￭￭￭￭￭￭￭ V
5 Operation and maintenance 70
5.1 General notes ...................................................................... 70
5.1.1 Care ...................................................................................... 70
5.1.2 Maintenance by Metrohm Service .......................................... 70
5.1.3 Sensor care ............................................................................ 70
6 Troubleshooting 71
6.1 General ................................................................................ 71
6.2 Problems .............................................................................. 72
6.2.1 Troubleshooting .................................................................... 72
6.3 Restarting/resetting the instrument ................................. 74
6.3.1 Instrument reset .................................................................... 74
6.3.2 Resetting the instrument to factory settings ........................... 74
6.4 Messages ............................................................................. 75
7 Appendix 76
7.1 Saved buffer series ............................................................. 76
7.1.1 Metrohm ............................................................................... 77
7.1.2 NIST (according to DIN standard 19266, 2015) ...................... 78
7.1.3 DIN (according to DIN standard 19267, 2012) ....................... 79
7.1.4 Fisher .................................................................................... 80
7.1.5 Mettler Toledo ....................................................................... 81
7.1.6 Merck CertiPUR 20 / Titrisol ................................................... 82
7.1.7 Merck CertiPUR 25 ................................................................ 83
7.1.8 Beckmann ............................................................................. 84
7.1.9 Radiometer Analytical ............................................................ 85
7.1.10 Baker ..................................................................................... 86
7.1.11 Hamilton DURACAL ............................................................... 87
7.1.12 Fluka ..................................................................................... 88
8 Technical specifications 89
8.1 Measuring inputs ................................................................ 89
8.2 Measured value memory .................................................... 90
8.3 TFT display .......................................................................... 90
8.4 Interfaces ............................................................................. 90
8.5 Energy supply ...................................................................... 91
8.6 Charging time ..................................................................... 91
8.7 Runtime with rechargeable battery .................................. 92
8.8 Ambient temperature ......................................................... 92
8.9 Reference conditions .......................................................... 92
8.10 Dimensions/material ........................................................... 93

Table of contents ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
VI ￭￭￭￭￭￭￭￭ 912/913/914 Meter
9 Accessories 94
Glossary 95
Index 96

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of figures
912/913/914 Meter ￭￭￭￭￭￭￭￭ VII
Table of figures
Figure 1 912 Conductometer - connectors ...................................................... 7
Figure 2 913 pH Meter - Connectors ............................................................... 8
Figure 3 pH/DO/Conductometer (digital) - Connectors .................................... 8
Figure 4 914 pH/Conductometer (analog) - connectors ................................... 9
Figure 5 912/913/914 Meter in a laboratory setup ........................................ 10
Figure 6 912/913/914 Meter for mobile application ...................................... 11
Figure 7 USB Y cable ..................................................................................... 18
Figure 8 View - Main dialog .......................................................................... 22
Figure 9 View - Menu dialog ......................................................................... 23
Figure 10 View - Editing dialog ....................................................................... 23
Figure 11 View - Selection dialog .................................................................... 24
Figure 12 View - Standby display .................................................................... 24
Figure 13 Operation - Main dialog, two-channel pH and conductivity ............. 28
Figure 14 Operation - Main dialog, two-channel pH and conductivity ............. 29
Figure 15 Operation - Main dialog, one-channel pH ........................................ 30
Figure 16 Operation - menu dialog ................................................................. 32
Figure 17 Operation - editing dialog ............................................................... 33
Figure 18 Operation - selection dialog ............................................................. 34
Figure 19 Example of a message ..................................................................... 75

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
912/913/914 Meter ￭￭￭￭￭￭￭￭ 1
1 Introduction
This manual gives you a comprehensive overview of the installation, func-
tioning and operation of the 912/913/914 Meter instruments.
NOTICE
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
912/913/914 Meter instruments are designed for use both outdoors
and indoors as well as for stationary use in the laboratory.
The measuring instruments are equipped with a permanently installed
rechargeable battery for mobile use.
The instruments come in 5 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.
913 pH/DO Meter With an analog and a digital measuring channel each for measuring pH,
potential, temperature and oxygen.
914 pH/Conducto-
meter
With an analog measuring channel for measuring pH, potential and tem-
perature and a measuring channel for measuring conductivity, TDS, salinity
and temperature.
914 pH/DO/
Conductometer
With a digital measuring channel for measuring pH, potential, tempera-
ture and oxygen and a measuring channel for measuring conductivity,
TDS, salinity and temperature.
For stationary use in the laboratory, the instrument can be connected to
the energy supply with a dedicated power supply unit.

1.1 Instrument description ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
2￭￭￭￭￭￭￭￭ 912/913/914 Meter
1.1.1 Instrument versions and sales versions
912/913/914 Meter instruments 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 accessories 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 accessories case
2.913.0210 913 pH Meter (digital/analog) Laboratory version with stand plate
2.913.0020 913 pH/DO Meter (digital/analog) Instrument with standard accessories
2.913.0120 913 pH/DO Meter (digital/analog) Mobile version with accessories case
2.913.0220 913 pH/DO Meter (digital/analog) Laboratory version with stand plate
2.914.0020 914 pH/Conductometer (pH analog) Instrument with standard accessories
2.914.0120 914 pH/Conductometer (pH analog) Mobile version with accessories case
2.914.0220 914 pH/Conductometer (pH analog) Laboratory version with stand plate
2.914.0030 914 pH/DO/Conductometer (pH digital) Instrument with standard accessories
2.914.0130 914 pH/DO/Conductometer (pH digital) Mobile version with accessories case
2.914.0230 914 pH/DO/Conductometer (pH digital) Laboratory version with stand plate
NOTICE
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 Energy supply
The instrument is powered either by a built-in battery or, in stationary use,
via a power supply unit.
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 Introduction
912/913/914 Meter ￭￭￭￭￭￭￭￭ 3
1.1.4 Sensors
Metrohm offers various sensors for specific measurements.
NOTICE
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 measuring in chemicals and flammable sam-
ples. Therefore, the use of the 912/913/914 Meter requires the user to
have basic knowledge and experience in handling toxic and caustic sub-
stances. Knowledge regarding the application of fire prevention 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
File ▶ New Menu or menu item
[Next] Button or key

1.4 Safety instructions ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
4￭￭￭￭￭￭￭￭ 912/913/914 Meter
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
Operate this instrument only according to the information contained in
this documentation.
This instrument 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.
1.4.2 Electrical safety
Electrical safety when working with the instrument is ensured in compli-
ance with international standard IEC 61010.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
912/913/914 Meter ￭￭￭￭￭￭￭￭ 5
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.
Rechargeable battery / 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 rechargeable battery or the power supply unit has
been damaged, have it checked by a service center. Do not use dam-
aged batteries 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￭￭￭￭￭￭￭￭ 912/913/914 Meter
1.4.4 Recycling and disposal
This product is covered by European Directive 2012/19/EU, WEEE – Waste
Electrical and Electronic Equipment.
The correct disposal of your old instrument will help to prevent negative
effects on the environment and public health.
More details about the disposal of your old instrument can be obtained
from your local authorities, from waste disposal companies or from your
local dealer.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 2 Overview of the instrument
912/913/914 Meter ￭￭￭￭￭￭￭￭ 7
2 Overview of the instrument
2.1 Instrument connectors
2.1.1 912 Conductometer
Figure 1 912 Conductometer - connectors
1Conductivity measuring cell
Connection socket for conductivity measur-
ing cells.
2Type B mini USB connector
Connection socket for energy supply, data
transmission and printing.

2.1 Instrument connectors ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
8￭￭￭￭￭￭￭￭ 912/913/914 Meter
2.1.2 913 pH Meter | 913 pH/DO Meter
Figure 2 913 pH Meter - Connectors
1pH/mV electrode
Connection socket for analog pH/mV elec-
trodes.
2Temperature sensor / reference
3pH/mV electrode | O2 Lumitrode
Connection socket for connecting iTrodes
with 854 iConnect or the O2 Lumitrode.
4Type B mini USB connector
Connection socket for energy supply, data
transmission and printing.
2.1.3 914 pH/DO/Conductometer
Figure 3 pH/DO/Conductometer (digital) - Connectors
1Conductivity measuring cell
Connection socket for conductivity measur-
ing cells.
2pH/mV electrode | O2 Lumitrode
Connection socket for connecting iTrodes
with 854 iConnect or the O2 Lumitrode.
3Type B mini USB connector
Connection socket for energy supply, data
transmission and printing.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 2 Overview of the instrument
912/913/914 Meter ￭￭￭￭￭￭￭￭ 9
1
2.1.4 914 pH/Conductometer
Figure 4 914 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 energy supply, data
transmission and printing.
2.2 Application environment
912/913/914 Meter instruments have been designed for use in labora-
tories 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, 912/913/914 Meter instruments can be placed in a
stand plate.

2.2 Application environment ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
10 ￭￭￭￭￭￭￭￭ 912/913/914 Meter
Figure 5 912/913/914 Meter in a laboratory setup
1Electrode holder 2Clamping ring
3Stand plate
Consisting of receptacle base and support
rod.
2.2.2 Mobile application
For mobile application, 912/913/914 Meter instruments can be
equipped with a carrying strap and one or two slide-in holders for elec-
trodes.