Metrohm 904 Titrando User manual

904 Titrando
Manual
8.904.8003EN / 2019-12-11

Metrohm AG
CH-9100 Herisau
Switzerland
Phone [phone]
Fax [phone]
[email protected]
www.metrohm.com
904 Titrando
Manual
8.904.8003EN / 2019-12-11

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
904 Titrando ￭￭￭￭￭￭￭￭ III
Table of contents
1 Introduction 1
1.1 The Titrando system ............................................................. 1
1.2 Instrument description ......................................................... 2
1.3 Titration modes – Measuring modes – Dosing com-
mands .................................................................................... 3
1.4 About the documentation ................................................... 5
1.4.1 Symbols and conventions ........................................................ 5
1.5 Safety instructions ................................................................ 6
1.5.1 General notes on safety ........................................................... 6
1.5.2 Electrical safety ........................................................................ 6
1.5.3 Working with liquids ................................................................ 7
1.5.4 Flammable solvents and chemicals ........................................... 7
1.5.5 Recycling and disposal ............................................................. 7
2 Overview of the instrument 8
3 Installation 10
3.1 Setting up the instrument .................................................. 10
3.1.1 Packaging .............................................................................. 10
3.1.2 Checks .................................................................................. 10
3.1.3 Location ................................................................................ 10
3.2 Connecting a controller ...................................................... 10
3.2.1 Operation .............................................................................. 10
3.3 Connecting MSB devices .................................................... 15
3.3.1 Connecting a dosing device ................................................... 16
3.3.2 Connecting a stirrer or titration stand .................................... 17
3.3.3 Connecting a Remote Box ..................................................... 18
3.4 Connecting USB devices ..................................................... 19
3.4.1 General ................................................................................. 19
3.4.2 Connecting a USB hub ........................................................... 20
3.4.3 Connecting a printer .............................................................. 20
3.4.4 Connecting a balance ............................................................ 21
3.4.5 Connecting a PC keyboard (only for operation with Touch
Control) ................................................................................. 22
3.4.6 Connecting a barcode reader ................................................. 23
3.5 Connecting sensors ............................................................ 24
3.5.1 Connecting a pH, metal or ion-selective electrode .................. 24
3.5.2 Connecting a reference electrode .......................................... 25
3.5.3 Connecting a polarizable electrode ........................................ 25
3.5.4 Connecting a temperature sensor or an electrode with inte-
grated temperature sensor ..................................................... 26

Table of contents ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
IV ￭￭￭￭￭￭￭￭ 904 Titrando
3.5.5 Connecting an iConnect ........................................................ 26
3.5.6 Differential potentiometry ...................................................... 28
4 Setting up the titration vessel 29
4.1 General ................................................................................ 29
5 Working with the exchange unit 30
6 Operation and maintenance 32
6.1 General notes ...................................................................... 32
6.1.1 Care ...................................................................................... 32
6.1.2 Maintenance by Metrohm Service .......................................... 32
7 Troubleshooting 33
7.1 General ................................................................................ 33
7.2 SET titration ........................................................................ 34
7.2.1 ............................................................................................. 34
8 Appendix 36
8.1 Remote interface ................................................................ 36
8.1.1 Pin assignment of the remote interface .................................. 36
9 Technical specifications 40
9.1 Measuring interface ........................................................... 40
9.1.1 Potentiometry ........................................................................ 40
9.1.2 Temperature .......................................................................... 40
9.1.3 Polarizer ................................................................................ 41
9.2 Internal dosing device ........................................................ 42
9.3 Power connection ............................................................... 42
9.4 Ambient temperature ......................................................... 42
9.5 Reference conditions .......................................................... 42
9.6 Dimensions .......................................................................... 43
9.7 Interfaces ............................................................................. 43
10 Accessories 44
Index 45

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of figures
904 Titrando ￭￭￭￭￭￭￭￭ V
Table of figures
Figure 1 The Titrando system .......................................................................... 1
Figure 2 Front 904 Titrando ............................................................................ 8
Figure 3 Rear 904 Titrando ............................................................................. 9
Figure 4 Connecting the Touch Control ......................................................... 11
Figure 5 Connecting the computer ................................................................ 14
Figure 6 MSB connections ............................................................................ 15
Figure 7 Connecting a dosing device ............................................................. 17
Figure 8 Connecting an MSB stirrer ............................................................... 18
Figure 9 Connecting the rod stirrer to the titration stand ............................... 18
Figure 10 Connecting the Remote Box ............................................................ 19
Figure 11 Connecting a printer ....................................................................... 21
Figure 12 Connecting a pH, metal or ion-selective electrode ........................... 24
Figure 13 Connecting a reference electrode .................................................... 25
Figure 14 Connecting a polarizable electrode .................................................. 25
Figure 15 Connecting a temperature sensor or an electrode with integrated tem-
perature sensor ............................................................................... 26
Figure 16 Connecting the iConnect ................................................................. 27
Figure 17 Connecting an electrode to the iConnect ........................................ 27
Figure 18 Schematic configuration of magnetic stirrer, electrode and buret tip
during a titration. a) stirring direction clockwise, b) stirring direction
counterclockwise. ............................................................................ 29
Figure 19 Attaching the exchange unit ............................................................ 30
Figure 20 Connectors of the Remote Box ........................................................ 36
Figure 21 Pin assignment of remote socket and remote plug ........................... 36

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
904 Titrando ￭￭￭￭￭￭￭￭ 1
1 Introduction
1.1 The Titrando system
The Titrando is the heart of the modular Titrando system. Operation is car-
ried out either by a Touch Control with a touch-sensitive screen ("stand-
alone titrator") or by a computer with a corresponding software.
A Titrando system can contain numerous, various kinds of instruments.
The following figure provides an overview of the peripheral devices you
can connect to the 904 Titrando.
MSB
USB
Controller
Input 1 / 2
Sensors
PC keyboard
Barcode
reader
USB hub
USB/RS-232 Converter
Balance
Touch Control
USB Sample Processor
Robotic Titrosampler
Printer
Relay Box
Remote Box
Dosing Interface
Stirrer / Ti Stand Dosino Dosimat
On
Status
805
D
o
s
i
m
a
Me
t
r
o
h
Titrando
Computer
On
Status
Figure 1 The Titrando system

1.2 Instrument description ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
2￭￭￭￭￭￭￭￭ 904 Titrando
Up to three control instruments (Titrando, Dosing Interface, USB Sample
Processor, etc.) can be controlled via USB connection during operation
with the 900 Touch Control.
You can request information on special applications in the "Application
Bulletins" and "Application Notes", available free of charge via the
Metrohm representative responsible. Various monographs on the subjects
of titration techniques and electrodes are also available.
Updating the device software is described in the help of the correspond-
ing PC software.
1.2 Instrument description
The 904 Titrando has the following characteristics:
￭Operation
Operation is carried out by means of a touch-sensitive Touch Control or
with a high-performance PC software.
￭Dosing
An internal dosing drive for exchange units.
￭MSB connectors
Four MSB connectors (Metrohm Serial Bus) for connecting dosing devi-
ces (Dosimat with exchange unit or Dosino with dosing unit), stirrers,
titration stands and Remote Boxes.
￭USB connectors
Two USB connectors, through which devices such as printers, PC key-
boards, barcode readers or additional control devices (USB Sample Pro-
cessor, Titrando, Dosing Interface, etc.) can be connected.
￭Measuring interface
Depending on the model version, one or two measuring interface(s).
Each measuring interface has one measuring input each for:
– a potentiometric electrode (pH, metal or ion-selective electrode)
– a separate reference electrode
– a temperature sensor (Pt1000 or NTC)
– a polarizable electrode
– an iConnect (measuring interface for electrodes with integrated
data chip, so-called iTrodes)

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
904 Titrando ￭￭￭￭￭￭￭￭ 3
1.3 Titration modes – Measuring modes – Dosing com-
mands
The 904 Titrando supports the following titration modes, measuring
modes and dosing commands:
￭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)

1.3 Titration modes – Measuring modes – Dosing commands ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
4￭￭￭￭￭￭￭￭ 904 Titrando
￭MEAS
The following measuring modes can be selected for measurements:
–pH (pH measurement)
–U (potentiometric voltage measurement)
–Ipol (voltametric measurement with selectable polarization cur-
rent)
–Upol (amperometric measurement with selectable polarization
voltage)
–Conc (concentration measurement with or without standard
addition)
–T (temperature measurement)
￭STDADD
The measuring modes for standard addition are listed separately only in
tiamo™. In Touch Control they are integrated in the measuring mode
MEAS Conc.
The following measuring modes can be selected for measurements:
–auto (automatic addition of the standard addition solution by
specifying a potential difference)
–dos (automatic addition of the standard addition solution by
specifying the single volume increments)
–man (manual addition of the standard addition solution)
￭CAL
Electrode calibration.
Measuring mode:
–pH (calibration of pH electrodes)
–Conc (calibration of ion-selective electrodes)
￭ELT
Electrode test for pH electrodes.
This mode is listed separately only in tiamo™. In Touch Control, the
electrode test is a component part of the CAL calibration mode.
￭Dosing commands
The following commands for dosing can be selected:
–PREP (rinsing the cylinder and tubings of an exchange unit or
dosing unit)
–EMPTY (emptying the cylinder and tubings of a dosing unit)
–ADD (dosing a specified volume)
–LQH (carrying out complex dosing tasks with a Dosino)

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
904 Titrando ￭￭￭￭￭￭￭￭ 5
1.4 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.
1.4.1 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
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.

1.5 Safety instructions ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
6￭￭￭￭￭￭￭￭ 904 Titrando
NOTE
This symbol highlights additional information and
tips.
1.5 Safety instructions
1.5.1 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.
1.5.2 Electrical safety
The electrical safety when working with the instrument is ensured as part
of the 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 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.
Supply voltage
WARNING
An incorrect supply voltage can damage the instrument.
Only operate this instrument with a supply voltage specified for it (see
rear panel of the instrument).

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
904 Titrando ￭￭￭￭￭￭￭￭ 7
Protection against electrostatic charges
WARNING
Electronic components are sensitive to electrostatic charges and can be
destroyed by discharges.
Do not fail to pull the power cord out of the power socket before you
set up or disconnect electrical plug connections at the rear of the
instrument.
1.5.3 Working with liquids
CAUTION
Periodically check all system connections for leaks. Observe the relevant
regulations in respect to working with flammable and/or toxic fluids
and their disposal.
1.5.4 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. 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.
1.5.5 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.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
8￭￭￭￭￭￭￭￭ 904 Titrando
2 Overview of the instrument
904 Titrando
On
Status
iTrode ready
12
3
4
6
5
Metrohm
Figure 2 Front 904 Titrando
1Guide openings
For centering the exchange unit.
2Piston rod
Moves the piston of the exchange unit up
and down.
3Contact pins
For the data chip.
4Coupling
For switching the flat stopcock.
5"On" LED
Lights up when the Titrando is ready for
operation.
6"Status" LED
Shows the current status of the internal dos-
ing drive.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 2 Overview of the instrument
904 Titrando ￭￭￭￭￭￭￭￭ 9
USB 1 USB 2
MSB 1
MSB 2
MSB 3
MSB 4
Controller
Nr Input 1
Ind.
Ref.
Temp.
100 - 240 V
iConnect.
f 50 - 60 Hz
P 45 W
Made by Metrohm
Herisau Switzerland
Pol.
1
2
3
4
5
6
7
8
9
10
11
Figure 3 Rear 904 Titrando
1Type plate
Contains specifications concerning supply
voltage, instrument type and serial number.
2USB connector (USB 1 and USB 2)
USB ports (type A) for connecting printer,
keyboard, barcode reader, additional Titran-
dos, USB Sample Processor, etc.
3Connector (Controller)
For connecting a Touch Control or a PC with
installed PC software. Mini DIN, 9-pin.
4MSB connector (MSB 1 to MSB 4)
Metrohm Serial Bus. For connecting external
dosing devices, stirrers or Remote Boxes.
Mini DIN, 9-pin.
5Power socket 6Measuring interface 1 (Input 1)
7Electrode connector (Ind.)
For connecting pH, metal or ion-selective
electrodes with integrated or separated ref-
erence electrode. Socket F.
8Electrode connector (Ref.)
For connecting reference electrodes, e.g.
Ag/AgCl reference electrode. Socket B,
4 mm.
9Temperature sensor connector (Temp.)
For connecting temperature sensors (Pt1000
or NTC). Two B sockets, 2 mm.
10 Electrode connector (Pol.)
For connecting polarizable electrodes, e.g.
double Pt wire electrodes. Socket F.
11 Electrode connector (iConnect)
For connecting electrodes with integrated
data chip (iTrodes).

3.1 Setting up the instrument ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
10 ￭￭￭￭￭￭￭￭ 904 Titrando
3 Installation
3.1 Setting up the instrument
3.1.1 Packaging
The instrument is supplied in protective packaging together with the sepa-
rately 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 com-
plete 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.
Place the instrument in a location of the laboratory which is suitable for
operation and free of vibrations and which provides protection against
corrosive atmosphere and contamination by chemicals.
The instrument should be protected against excessive temperature fluctua-
tions and direct sunlight.
3.2 Connecting a controller
3.2.1 Operation
Two different versions are available for operating the 904 Titrando:
￭A Touch Control with touch-sensitive screen. It forms a "stand-alone
instrument" together with the 904 Titrando.
￭A computer enables operation of the 904 Titrando with the help of a
PC software, e.g. tiamo.
CAUTION
Take care to ensure that the power cord is pulled out of the power
socket before either setting up or disconnecting connections between
the instruments.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 3 Installation
904 Titrando ￭￭￭￭￭￭￭￭ 11
3.2.1.1 Connecting a Touch Control
NOTICE
The plug is protected against accidental disconnection of the cable by
means of a pull-out protection feature. If you wish to pull out the plug,
you first need to pull back the outer plug sleeve marked with arrows.
Connect the Touch Control as follows:
1￭Insert the plug of the Touch Control connection cable into the
Controller socket.
Figure 4 Connecting the Touch Control
2￭Connect the MSB devices (see chapter 3.3, page 15).
￭Connect the USB devices (see chapter 3.4, page 19).
3￭Connect the Titrando to the power grid.
4￭Switch on the Touch Control.
The Touch Control power supply is supplied through the Titrando.
Automatic system tests are performed on both instruments at the
time of activation. The On LED on the front of the Titrando lights up
when the system test has been completed and the instrument is
ready for operation.

3.2 Connecting a controller ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
12 ￭￭￭￭￭￭￭￭ 904 Titrando
CAUTION
The Touch Control must be shut down properly by deactivation with the
power switch on the rear of the instrument before the power supply is
interrupted. If this is not done, then there is a danger of data loss.
Because of the fact that the power supply for the Touch Control is pro-
vided through the Titrando, you must never disconnect the Titrando
from the power grid (e.g. by deactivating with a connector strip) before
you have deactivated the Touch Control.
If you would prefer not to position the Touch Control directly next to the
Titrando, then you can lengthen the connection with the 6.2151.010
cable. The maximum connection length permitted is 5 m.
3.2.1.2 Connecting the instrument to the power grid
WARNING
Electric shock from electrical potential
Risk of injury by touching live components or through moisture on live
parts.
￭Never open the housing of the instrument while the power cord is
still connected.
￭Protect live parts (e.g. power supply unit, power cord, connection
sockets) against moisture.
￭Unplug the power plug immediately if you suspect that moisture has
gotten inside the instrument.
￭Only personnel who have been issued Metrohm qualifications may
perform service and repair work on electrical and electronic parts.
Connecting the power cord
Accessories Power cord with the following specifications:
￭Length: max. 2 m
￭Number of cores: 3, with protective conductor
￭Instrument plug: IEC 60320 type C13
￭Conductor cross-section 3x min. 0.75 mm2 / 18 AWG
￭Power plug:
– according to customer requirement (6.2122.XX0)
– min. 10 A