Metrohm 848 User Manual
848 Titrino plus
Manual
8.848.8008EN
Metrohm AG
CH-9100 Herisau
Switzerland
Phone +41 71 353 85 85
Fax +41 71 353 89 01
info@metrohm.com
www.metrohm.com
848 Titrino plus
8.848.8008EN
Manual
08.2012 jb/ebe
Teachware
Metrohm AG
CH-9100 Herisau
teachware@metrohm.com
This documentation is protected by copyright. All rights reserved.
Although all the information given in this documentation has been
checked with great care, errors cannot be entirely excluded. Should you
notice any mistakes please send us your comments using the address
given above.
Documentation in additional languages can be found on
http://documents.metrohm.com.
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Table of contents
1 Introduction 1
1.1 Instrument description ......................................................... 1
1.1.1 Titration and measuring modes ................................................ 1
1.1.2 Connectors .............................................................................. 2
1.1.3 Intended use ........................................................................... 2
1.2 About the documentation ................................................... 2
1.2.1 Symbols and conventions ........................................................ 3
1.3 Safety instructions ................................................................ 4
1.3.1 General notes on safety ........................................................... 4
1.3.2 Electrical safety ........................................................................ 4
1.3.3 Tubing and capillary connections ............................................. 5
1.3.4 Flammable solvents and chemicals ........................................... 5
1.3.5 Recycling and disposal ............................................................. 5
2 Overview of the instrument 7
Table of contents
3 Installation 9
3.1 Setting up the instrument .................................................... 9
3.1.1 Packaging ................................................................................ 9
3.1.2 Checks .................................................................................... 9
3.1.3 Location .................................................................................. 9
3.2 Connecting a sensor ............................................................. 9
3.3 Connecting a stirrer ............................................................ 11
3.4 Connecting a balance ......................................................... 12
3.5 Connecting a keyboard, printer and other USB devi-
ces ........................................................................................ 12
3.6 Connecting instruments to the remote connector .......... 15
3.7 Attaching the exchange unit ............................................. 16
4 Titrations 17
4.1 Dynamic equivalence point titration (DET) ....................... 17
4.2 Monotonic equivalence point titration (MET) .................. 17
4.3 Endpoint titration (SET) ..................................................... 18
848 Titrino plus
5 Operation 19
5.1 Switching the instrument on and off ............................... 19
5.2 Fundamentals of operation ............................................... 20
5.2.1 The keypad ............................................................................ 20
5.2.2 Structure of the dialog windows ............................................ 21
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III
Table of contents
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5.2.3 Navigating in the dialog ......................................................... 21
5.2.4 Entering text and numbers ..................................................... 22
5.2.5 Selecting from a selection list ................................................. 23
5.3 Formula editor .................................................................... 23
5.4 Methods .............................................................................. 25
5.4.1 Creating a new method ......................................................... 25
5.4.2 Saving a method ................................................................... 26
5.4.3 Loading a method ................................................................. 27
5.4.4 Exporting a method ............................................................... 28
5.5 Control ................................................................................. 29
5.6 Sample data ........................................................................ 30
5.6.1 Entering sample data in the main dialog ................................ 30
5.6.2 Requesting sample data at the start of the determination ...... 31
5.7 Sample table ....................................................................... 32
5.7.1 General ................................................................................. 32
5.7.2 Editing the sample data ......................................................... 33
5.7.3 Sending the sample size from a balance ................................. 35
5.8 Carrying out a determination ............................................ 35
5.9 Live modifications .............................................................. 37
5.9.1 Editing the sample data of the running determination ............ 37
5.9.2 Editing the sample table while a determination is running ...... 38
5.9.3 Editing the live parameters ..................................................... 39
5.10 Results ................................................................................. 40
5.11 Statistics .............................................................................. 41
5.12 Printing a report manually ................................................. 43
5.13 Manual Control ................................................................... 44
5.13.1 Dosing ................................................................................... 45
5.13.2 Measuring ............................................................................. 49
5.13.3 Stirring .................................................................................. 50
6 System settings 52
6.1 Basic settings ...................................................................... 52
6.2 Managing sensors .............................................................. 56
6.2.1 General ................................................................................. 56
6.2.2 Editing the sensor data .......................................................... 56
6.3 Managing solutions ............................................................ 58
6.3.1 General ................................................................................. 58
6.3.2 Editing the solution data ........................................................ 58
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IV
6.4 Managing common variables ............................................ 60
6.4.1 General ................................................................................. 60
6.4.2 Editing common variables ...................................................... 61
6.5 File management ................................................................ 62
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7 Parameters 68
Table of contents
6.6 Configuring external devices ............................................. 63
6.7 Instrument diagnosis .......................................................... 66
6.7.1 Loading program versions and language files ......................... 66
6.7.2 Diagnosis functions ............................................................... 67
7.1 Dynamic equivalence point titrations (DET) ..................... 68
7.1.1 Start conditions ..................................................................... 68
7.1.2 Titration parameters .............................................................. 69
7.1.3 Stop conditions ..................................................................... 74
7.1.4 Evaluation ............................................................................. 76
7.1.5 Calculation ............................................................................ 79
7.1.6 Statistics ................................................................................ 81
7.1.7 Reports .................................................................................. 81
7.2 Monotonic equivalence point titrations (MET) ................ 83
7.2.1 Start conditions ..................................................................... 83
7.2.2 Titration parameters .............................................................. 84
7.2.3 Stop conditions ..................................................................... 89
7.2.4 Evaluation ............................................................................. 90
7.2.5 Calculation ............................................................................ 93
7.2.6 Statistics ................................................................................ 95
7.2.7 Reports .................................................................................. 95
7.3 Endpoint titrations (SET) .................................................... 97
7.3.1 Conditioning ......................................................................... 97
7.3.2 Start conditions ..................................................................... 98
7.3.3 Titration parameters ............................................................ 100
7.3.4 Control parameters EP1 ....................................................... 102
7.3.5 Control parameters EP2 ....................................................... 105
7.3.6 Stop conditions ................................................................... 105
7.3.7 Calculation .......................................................................... 106
7.3.8 Statistics .............................................................................. 108
7.3.9 Reports ................................................................................ 108
7.4 pH calibration (CAL) ......................................................... 110
7.4.1 Calibration parameters ........................................................ 110
7.4.2 Buffers ................................................................................. 112
7.4.3 Reports ................................................................................ 113
8 Operation and maintenance 114
8.1 Quality Management and validation with Metrohm .... 114
9 Troubleshooting 115
9.1 SET titration ...................................................................... 115
9.2 Miscellaneous ................................................................... 116
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Table of contents
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10 Appendix 117
10.1 Exchange unit ................................................................... 117
10.1.1 Maximum dosing and filling rate .......................................... 117
10.1.2 Parameters for the preparing (PREP) ..................................... 117
10.2 Stirring rate ....................................................................... 118
10.3 Balance .............................................................................. 118
10.4 USB devices ....................................................................... 119
10.4.1 6.2147.000 numerical USB keypad ...................................... 119
10.4.2 Key assignment of a USB keyboard ...................................... 120
10.4.3 PC mouse ............................................................................ 120
10.4.4 Printer ................................................................................. 121
10.5 System initialization ......................................................... 121
10.6 Remote interface .............................................................. 122
10.6.1 Pin assignment of the remote interface ................................ 122
10.6.2 Status diagram of the remote interface ................................ 124
10.7 Remote control via an RS-232 connection ..................... 125
10.7.1 Commands and variables ..................................................... 126
10.8 Arithmetic algorithms in the 848 Titrino plus ............... 127
11 Technical specifications 130
11.1 Measuring inputs .............................................................. 130
11.1.1 Potentiometry ...................................................................... 130
11.1.2 Polarizer .............................................................................. 130
11.1.3 Temperature ........................................................................ 131
11.2 Dosing drive ...................................................................... 132
11.3 Interfaces .......................................................................... 132
11.4 Mains connection ............................................................. 132
11.5 Safety specifications ........................................................ 132
11.6 Electromagnetic compatibility (EMC) ............................. 133
11.7 Ambient temperature ...................................................... 133
11.8 Reference conditions ........................................................ 134
11.9 Dimensions ........................................................................ 134
12 Warranty (Guarantee) 135
13 Accessories 137
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VI
13.1 Scope of delivery .............................................................. 137
13.2 Optional accessories ........................................................ 138
Index 144
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Table of figures
Figure 1 Front 848 Titrino plus ........................................................................ 7
Figure 2 Rear 848 Titrino plus ......................................................................... 8
Figure 3 Connecting pH or redox electrodes ................................................... 9
Figure 4 Connecting a reference electrode .................................................... 10
Figure 5 Connecting a temperature sensor .................................................... 10
Figure 6 Connecting a polarizable electrode .................................................. 11
Figure 7 Connecting a stirrer ......................................................................... 11
Figure 8 Connecting a balance ...................................................................... 12
Figure 9 Connecting USB devices .................................................................. 13
Figure 10 Connecting the USB stick ................................................................ 14
Figure 11 Connecting the 6.2147.000 USB keyboard with USB stick and
printer ............................................................................................. 14
Figure 12 Connecting the USB hub with USB stick, printer and the 6.2148.030
RS-232/USB Box (for connecting balances). ...................................... 15
Figure 13 Connecting a remote cable ............................................................. 15
Figure 14 Attaching the exchange unit ........................................................... 16
Figure 15 Reagent dosing for DET ................................................................... 17
Figure 16 Reagent dosing for MET .................................................................. 17
Figure 17 Reagent dosing for SET ................................................................... 18
Figure 18 Keypad 848 Titrino plus ................................................................... 20
Figure 19 Directory structure on the USB flash drive ........................................ 62
Figure 20 Tubbs method for determining the equivalence point ...................... 79
Figure 21 Rotational speed depending on stirring rate .................................. 118
Figure 22 Pin assignment of remote socket and remote plug ........................ 122
Figure 23 Remote status diagram DET/MET ................................................... 124
Figure 24 Remote status diagram SET ........................................................... 124
Figure 25 Remote status diagram CAL .......................................................... 125
Figure 26 Connecting the RS-232/USB Box to the PC .................................... 125
Table of figures
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VII
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1 Introduction
1.1 Instrument description
The 848 Titrino plus is a titrator for volumetric titrations for universal applications. Methods can be created and stored under a new name. The
methods can be exported to a connected USB flash drive. This function
makes it possible for you to copy methods quickly and easily from one
instrument to another. The remote connector enables the integration of
the instrument in a Metrohm automation system.
1.1.1 Titration and measuring modes
The following titration and measuring modes are supported:
￭ DET
Dynamic equivalence point titration. The reagent is added in variable
volume steps.
Measuring modes:
– pH (pH measurement)
– U (potentiometric voltage measurement)
– Ipol (voltametric measurement with selectable polarization cur-
rent)
– Upol (amperometric measurement with selectable polarization
voltage)
￭ MET
Monotonic equivalence point titration. The reagent is added in con-
stant volume steps.
Measuring modes:
– pH (pH measurement)
– U (potentiometric voltage measurement)
– Ipol (voltametric measurement with selectable polarization cur-
rent)
– Upol (amperometric measurement with selectable polarization
voltage)
￭ SET
Endpoint titration at one or two specified endpoints.
Measuring modes:
– pH (pH measurement)
– U (potentiometric voltage measurement)
– Ipol (voltametric measurement with selectable polarization cur-
rent)
– Upol (amperometric measurement with selectable polarization
voltage)
1 Introduction
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1.2 About the documentation
￭ CAL
1.1.2 Connectors
The instrument is equipped with the following connectors:
￭ MSB connector (Metrohm Serial Bus)
￭ USB (OTG) connector
￭ Sensor connectors
￭ Remote connector
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Electrode calibration.
Measuring mode:
– pH (calibration of pH electrodes)
For connecting a stirrer.
The 6.2151.100 adapter can be used to connect, for example, a
printer, a USB flash drive or a USB keyboard.
Four connectors for the following sensor types:
– pH or redox electrodes
– reference electrodes
– polarizable electrodes
– temperature sensors (Pt1000 or NTC)
For connecting a Dosimat or sample changer. The Dosimat enables
automatic addition of an auxiliary solution.
1.1.3 Intended use
The 848 Titrino plus is designed for usage as a titrator in analytical laboratories. Its main application field is volumetric titration.
This instrument is suitable for processing chemicals and flammable samples. The usage of the 848 Titrino plus therefore requires that the user
have basic knowledge and experience in the handling of toxic and caustic
substances. Knowledge with respect to the application of the fire prevention measures prescribed for laboratories is also mandatory.
1.2 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 operation of the instrument.
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1.2.1 Symbols and conventions
The following symbols and formatting may appear in this documentation:
Method Dialog text, parameter in the software
File ▶ New Menu or menu item
[Next] Button or key
1 Introduction
Cross-reference to figure legend
The first number refers to the figure number, the second to the instrument part in the figure.
Instruction step
Carry out these steps in the sequence shown.
Warning
This symbol draws attention to a possible life 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 a possible damage of
instruments or instrument parts.
Note
This symbol marks additional information and tips.
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3
1.3 Safety instructions
1.3 Safety instructions
1.3.1 General notes on safety
Warning
This instrument may only be operated in accordance with the specifications 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.
1.3.2 Electrical safety
The electrical safety when working with the instrument is ensured as part
of the international standard IEC 61010.
Warning
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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 by this. There is also a risk of serious injury if live components
are touched.
There are no parts inside the housing which can be serviced or replaced
by the user.
Mains voltage
Warning
An incorrect mains voltage can damage the instrument.
Only operate this instrument with a mains voltage specified for it (see
rear panel of the instrument).
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Protection against electrostatic charges
Warning
Electronic components are sensitive to electrostatic charges and can be
destroyed by discharges.
Do not fail to pull the mains cable out of the mains connection socket
before you set up or disconnect electrical plug connections at the rear
of the instrument.
1.3.3 Tubing and capillary connections
Caution
Leaks in tubing and capillary connections are a safety risk. Tighten all
connections well by hand. Avoid applying excessive force to tubing
connections. Damaged tubing ends lead to leakage. Appropriate tools
can be used to loosen connections.
1 Introduction
Check the connections regularly for leakage. If the instrument is used
mainly in unattended operation, then weekly inspections are mandatory.
1.3.4 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. laboratory
flue).
￭ Keep all sources of flame far from the workplace.
￭ Clean up spilled fluids and solids immediately.
￭ Follow the safety instructions of the chemical manufacturer.
1.3.5 Recycling and disposal
This product is covered by European Directive 2002/96/EC, WEEE – Waste
from Electrical and Electronic Equipment.
848 Titrino plus
The correct disposal of your old equipment will help to prevent negative
effects on the environment and public health.
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1.3 Safety instructions
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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.
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2
5
4
3
1
2 Overview of the instrument
2 Overview of the instrument
Figure 1 Front 848 Titrino plus
Piston rod
1
Of the dosing drive.
Coupling
3
For switching the flat stopcock.
Keypad
5
Contact pins
2
For the data chip.
Display
4
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7
2
4
8
6
5
9
1
3
7
Figure 2 Rear 848 Titrino plus
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Electrode connector (Ind.)
1
For connecting pH or redox electrodes with
integrated or separate reference electrode.
Socket F.
Electrode connector (Ref.)
3
For connecting reference electrodes. Socket
B, 4 mm.
USB (OTG) connector
5
For connecting printers, USB sticks, USB
hubs, etc.
Temperature sensor connector (Temp.)
7
For connecting temperature sensors of the
Pt1000 or NTC types. Two B sockets, 2 mm.
Electrode connector (Pol.)
9
For connecting polarizable electrodes, e.g.
double Pt electrodes. Socket F.
Type plate
2
Contains specifications concerning mains
voltage and serial number.
Mains connection socket
4
MSB connector
6
Metrohm Serial Bus.
For connecting a stirrer. Mini DIN, 9-pin.
Remote connector
8
For connecting instruments with a remote
interface. D-Sub, 9-pin.
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3 Installation
3.1 Setting up the instrument
3.1.1 Packaging
The instrument is supplied in highly protective special packaging together
with the separately packed accessories. Keep this packaging, as only this
ensures safe transportation of the instrument.
3.1.2 Checks
Immediately after receipt, check whether the shipment has arrived complete and without damage by comparing it with the delivery note.
3.1.3 Location
The instrument has been developed for operation indoors and may not be
used in explosive environments.
3 Installation
Place the instrument in a location of the laboratory which is suitable for
operation, free of vibrations, protected from corrosive atmosphere, and
contamination by chemicals.
The instrument should be protected against excessive temperature fluctuations and direct sunlight.
3.2 Connecting a sensor
Connecting pH or redox electrodes
Figure 3
Connecting pH or redox electrodes
848 Titrino plus
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9
3.2 Connecting a sensor
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Note
The electrode cable is protected against accidental disconnection of the
cable by means of a pull-out protection feature. If you wish to remove
the plug, then you must first retract the outer plug sleeve.
Connecting a reference electrode
Figure 4 Connecting a reference electrode
Connecting a temperature sensor or an electrode with integrated temperature sensor
Temperature sensors of the Pt1000 or NTC type can be connected to the
Temp. connector.
Figure 5
Connecting a temperature sensor
Note
The red plug must always be plugged into the red socket at the temperature sensor for the purpose of shielding against disruptions.
If you use an electrode with an integrated NTC probe, then you must
plug the red plug into the red socket.
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848 Titrino plus
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3 Installation
Connecting a polarizable electrode
Figure 6 Connecting a polarizable electrode
Note
The electrode cable is protected against accidental disconnection of the
cable by means of a pull-out protection feature. If you wish to remove
the plug, then you must first retract the outer plug sleeve.
3.3 Connecting a stirrer
You can connect the following stirrers:
￭ 801 Stirrer
￭ 803 Ti Stand
￭ 804 Ti Stand (requires rod stirrer)
Figure 7
Make sure that the flat side of the plug matches the marking on the
socket.
Connecting a stirrer
Caution
848 Titrino plus
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11
3.4 Connecting a balance
3.4 Connecting a balance
Balances are equipped with a serial RS-232 interface as a rule. To connect
a balance, you require a 6.2148.030 RS-232/USB Box.
Figure 8 Connecting a balance
When a 6.2151.020 USB cable is used, then the 6.2148.030 RS-232/USB
Box can be connected to the 848 Titrino plus by means of a USB hub or a
6.2151.100 adapter (see Chapter 3.5, page 12).
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Connect the 9-pin plug of the respective balance connecting cable to the
RS 232/1 connector. Consult the user manual of the balance in order to
select the correct connecting cable.
The parameters for the RS-232 interface on the instrument must match
those on the balance (see "Editing the COM1 settings", page 64). Additionally consult the user manual of the balance.
3.5 Connecting a keyboard, printer and other USB devices
The 848 Titrino plus has a USB (OTG) connector. Use the provided
6.2151.100 adapter USB MINI (OTG) - USB A for connecting USB devices
as e.g. printers, keyboards or USB sticks, see the following figure.
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6.2151.100
3 Installation
Figure 9 Connecting USB devices
Caution
Switch the instrument off before connecting or disconnecting a USB
device or a USB stick.
The 848 Titrino plus can only recognize the device immediately after
switching on.
The following devices can be operated directly on the USB connector
with the 6.2151.100 adapter:
￭ USB sticks (for the backup or storing of methods)
￭ 6.2147.000 numerical USB keypad
￭ 6.2148.030 RS-232/USB Box (for connecting balances or for the
RS-232 remote control)
￭ USB hub (with or without an own power supply)
The 6.2147.000 numerical USB keypad serves for comfortable numerical input and for navigating in the dialog. In addition, it provides two USB
connectors. Connect additional USB devices to the keypad.
Note
Most of the USB devices need a so-called hub in order to work correctly.
A USB hub is a distributor to which several USB devices can be connected. USB hubs are available in specialty stores in a number of different
models.
The USB (OTG) connector of the 848 Titrino plus has no such hub. The
6.2147.000 numerical USB keypad has a USB hub and two USB connectors.
848 Titrino plus
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3.5 Connecting a keyboard, printer and other USB devices
USB MINI (OTG)-USB
USB stick
6.2151.100
USB MINI (OTG)-USB
USB stick
Keypad
6.2147.000
6.2151.100
Printer
The following devices can only be connected to a 6.2147.000
numerical keypad or to a USB hub:
￭ Printer (with USB connector, use the 6.2151.020 connecting cable)
￭ Barcode reader (with USB cable)
￭ Mouse (PC mouse with USB cable, for navigating in the dialog)
The following devices can only be connected to a USB hub:
￭ PC keyboard (with USB cable, for the comfortable input of letters and
numbers)
￭ Keypad with numerical keypad (with USB cable)
If you wish to connect several different instruments without own
power supply, then you must possibly use a USB hub with own power
supply (self powered). The USB (OTG) connector of the 848 Titrino plus is
not designed for supplying power to several devices with elevated electricity requirements.
Also observe the instructions in chapter 10.4, page 119.
Examples:
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Figure 10
Connecting the USB stick
Figure 11 Connecting the 6.2147.000 USB keyboard with USB stick and
printer
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14
848 Titrino plus
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USB MINI (OTG)-USB
USB stick
USB-Hub
RS-232/USB Box
6.2148.030
6.2151.100
Printer
3 Installation
Figure 12 Connecting the USB hub with USB stick, printer and the
6.2148.030 RS-232/USB Box (for connecting balances).
3.6 Connecting instruments to the remote connector
The 848 Titrino plus can be integrated in an automation system with the
aid of a remote cable.
848 Titrino plus
Figure 13
Connecting a remote cable
A variety of different connecting cables are available for connecting
Metrohm instruments (e.g. sample changers) (see Optional Accessories
chapter).
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15
3.7 Attaching the exchange unit
3.7 Attaching the exchange unit
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Figure 14 Attaching the exchange unit
To attach the exchange unit, proceed as follows:
Slide the exchange unit from the front onto the 848 Titrino plus and
1
push all the way to the rear.
It must snap in audibly.
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16
848 Titrino plus
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U/mV
V/mL
U/mV
4 Titrations
4.1 Dynamic equivalence point titration (DET)
Dynamic equivalence point titration is a titration mode for all standard
titrations. The reagent is added in variable volume steps. The volume
increments vary as a function of the slope of the curve. An attempt is
made to achieve constant measured value alterations with each dosing.
The optimal volume for dosing is determined from the measured value
alterations of the previous dosings. Measured value acceptance is driftcontrolled (equilibrium titration) or after a waiting time. Equivalence points
are evaluated automatically.
4 Titrations
Figure 15
Reagent dosing for DET
4.2 Monotonic equivalence point titration (MET)
Monotonic equivalence point titration is a titration mode for titrations
with relatively high signal fluctuations or suddenly occurring potential
jumps and for slow titrations or slow-response electrodes. The reagent is
added in constant volume steps. Measured value acceptance is drift-controlled (equilibrium titration) or after a waiting time. Equivalence points are
evaluated automatically.
Figure 16
Reagent dosing for MET
848 Titrino plus
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17
4.3 Endpoint titration (SET)
t/s
EP
Continuous
dosing
Initial
dosing
V/mL
V/mL
U/mV
Control range
4.3 Endpoint titration (SET)
Endpoint titration is a titration mode for rapid routine determinations to a
preset endpoint (e.g. titrations in accordance with special norms) and
titrations for which reagent overflow must be avoided. The titration termination at the endpoint takes place either drift-controlled or after a waiting
period. The volume dosed until the endpoint is used for calculating the
content of the sample.
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Figure 17 Reagent dosing for SET
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18
848 Titrino plus
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5 Operation
5.1 Switching the instrument on and off
Switching on the instrument
Proceed as follows:
￭ Press the red [STOP] key.
1
The instrument is initialized and a system test performed. This
process takes some time.
￭ If a buret unit has been attached, then a request appears to carry
out the PREP function:
5 Operation
All tubings and the cylinder are rinsed with the PREP (Preparing)
function. The preparing of the buret unit is described in chapter
"Preparing the buret unit (PREP)", page 45.
￭ Confirm the message with [OK].
The display of this message can be deactivated in the system settings (see "PREP warning", page 54).
The main dialog is displayed:
848 Titrino plus
￭￭￭￭￭￭￭￭
19
5.2 Fundamentals of operation
Switching off the instrument
The instrument is switched off with the [STOP] key. The fact that the key
needs to be pressed down for an extended time prevents accidental
switch off.
Proceed as follows:
￭ Keep the red [STOP] key pressed down for at least 3 s.
1
A progress bar is displayed. If the key is released during this time,
then the instrument will not be switched off.
5.2 Fundamentals of operation
5.2.1 The keypad
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Figure 18
Keypad 848 Titrino plus
BACK Apply the input and exit the dialog.
⇧ ⇩ Move the selection bar either up or down by one
line at a time. Select the character to be entered
in the text editor.
⇦ ⇨ Select the character to be entered in the text and
number editor. Select the individual functions in
the function bar.
OK Confirm the selection.
STOP Stop an ongoing method run or a manual func-
tion. Switch the instrument on or off.
START Start a method run or a manual function.
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20
848 Titrino plus
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