Metrohm 900 User Manual
900 Touch Control
Manual
8.900.8015EN / 2014-03-10
Metrohm AG
CH-9100 Herisau
Switzerland
Phone +41 71 353 85 85
Fax +41 71 353 89 01
info@metrohm.com
www.metrohm.com
900 Touch Control
Program version 5.900.0030
8.900.8015EN / 2014-03-10
Manual
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.
Melody for the BEEP command: excerpt from "En Altfrentsche", with kind
permission of the Laseyer Quartett, Appenzell.
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Table of contents
1 Introduction 1
1.1 Instrument description ......................................................... 1
1.2 Titration and measuring modes .......................................... 1
1.3 About the documentation ................................................... 3
1.3.1 Symbols and conventions ........................................................ 3
2 Safety instructions 5
2.1 General notes on safety ....................................................... 5
2.2 Electrical safety ..................................................................... 5
2.3 Tubing and capillary connections ....................................... 6
2.4 Flammable solvents and chemicals ..................................... 6
2.5 Recycling and disposal ......................................................... 7
Table of contents
3 Overview of the instrument 8
4 Installation 10
4.1 Setting up the instrument .................................................. 10
4.1.1 Packaging .............................................................................. 10
4.1.2 Checks .................................................................................. 10
4.1.3 Location ................................................................................ 10
5 Titrations 11
5.1 Dynamic equivalence point titration (DET) ....................... 11
5.2 Monotonic equivalence point titration (MET) .................. 11
5.3 Endpoint titration (SET) ..................................................... 12
5.4 Water determination according to Karl Fischer (KFT) ..... 12
5.5 Endpoint titration with constant maintenance of the
measured value (STAT) ...................................................... 13
6 Operation 15
6.1 Switching the instrument on and off ............................... 15
6.2 Fundamentals of operation ............................................... 17
6.2.1 Touch-sensitive screen ........................................................... 17
6.2.2 Display elements and controls ................................................ 17
6.2.3 Status display ........................................................................ 18
6.2.4 Entering text and numbers ..................................................... 19
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Table of contents
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7 System settings 22
7.1 General system settings ..................................................... 22
7.1.1 Selecting the dialog language ................................................ 22
7.1.2 Setting the date, time and local time ..................................... 23
7.2 System-specific dialog options .......................................... 24
7.3 User administration ............................................................ 28
7.3.1 Editing the user configuration ................................................ 29
7.3.2 Creating an identification profile ............................................ 33
7.3.3 Defining login options ........................................................... 33
7.3.4 Password options .................................................................. 35
7.3.5 Modification options ............................................................. 37
7.3.6 Reasons ................................................................................. 38
7.3.7 Audit Trail .............................................................................. 39
7.4 Measured value display ..................................................... 40
7.5 Acoustic signals .................................................................. 40
8 Titrants 41
8.1 Adding a new titrant .......................................................... 42
8.2 Editing titrant data ............................................................. 43
8.3 Monitoring the working life .............................................. 45
8.4 Dosing unit .......................................................................... 46
8.4.1 Parameters for preparing (PREP) and emptying (EMPTY) ......... 47
8.4.2 Tubing parameters ................................................................. 48
8.4.3 Shift direction of the valve disk .............................................. 51
8.5 Exchange unit ..................................................................... 52
8.5.1 Parameters for the preparation (PREP) .................................... 53
8.5.2 Tubing parameters ................................................................. 54
8.6 GLP test for exchange unit and dosing unit .................... 56
8.7 Titer determination options and data .............................. 58
8.7.1 Titer validity ........................................................................... 58
8.7.2 Properties of the previous titer determinations ....................... 59
9 Reagents 61
9.1 Editing reagent data .......................................................... 62
9.2 Reagent monitoring ........................................................... 62
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10 Sensors 66
10.1 Adding a new sensor ......................................................... 67
10.2 Editing the sensor data ...................................................... 68
10.3 Monitoring the working life .............................................. 69
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11 Device manager 79
Table of contents
10.4 Calibration data (for pH- and ISE electrodes and con-
ductivity measuring cells only) .......................................... 70
10.4.1 Properties of the previous calibrations .................................... 72
10.5 Limit values for the calibration data ................................. 75
10.6 Monitoring the calibration interval (only for pH and
ion-selective electrodes and conductivity measuring
cells) ..................................................................................... 77
11.1 Adding a new device .......................................................... 80
11.2 Configuring the instrument ............................................... 80
11.3 Touch Control ..................................................................... 81
11.3.1 E-mail .................................................................................... 82
11.3.2 PC/LIMS report ...................................................................... 83
11.3.3 Shared memory ..................................................................... 84
11.3.4 TCP/IP settings ....................................................................... 86
11.4 Metrohm control devices ................................................... 87
11.4.1 Properties – Control device .................................................... 88
11.4.2 Properties – Measuring input ................................................. 88
11.4.3 Properties – MSB connector ................................................... 90
11.4.4 Properties – Peripheral devices ............................................... 91
11.5 USB Sample Processor ....................................................... 91
11.5.1 Properties – Sample Processor ............................................... 92
11.5.2 Properties – Tower ................................................................ 93
11.5.3 Properties – Swing Head ........................................................ 94
11.6 Sample racks ....................................................................... 99
11.6.1 Editing rack data .................................................................. 101
11.6.2 Rack adjustment .................................................................. 107
11.7 Printer ................................................................................ 108
11.7.1 PDF settings ......................................................................... 109
11.7.2 Network printer ................................................................... 110
11.7.3 More options ....................................................................... 112
11.8 Balance .............................................................................. 112
11.9 USB/RS-232 adapter ......................................................... 114
11.10 PC keyboard ...................................................................... 115
11.11 Barcode reader ................................................................. 117
12 File manager 119
12.1 Managing files .................................................................. 119
12.1.1 Copying a file ...................................................................... 121
12.1.2 Renaming a file ................................................................... 121
12.1.3 File properties ...................................................................... 122
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12.2 External storage medium ................................................ 123
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Table of contents
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12.3 Creating backups / Restoring data ................................. 125
12.3.1 Restoring data ..................................................................... 125
13 GLP manager 127
13.1 Automatic system test ..................................................... 128
13.2 Test tools .......................................................................... 128
13.3 GLP tests for measurement and titration ...................... 129
13.3.1 Parameter description .......................................................... 130
13.4 System validation ............................................................. 133
13.4.1 Parameter description .......................................................... 134
13.5 System monitoring ........................................................... 137
13.5.1 Service interval .................................................................... 137
13.5.2 Backup interval .................................................................... 138
14 Common variables 139
14.1 Editing common variables ............................................... 140
14.2 Properties of common variables ..................................... 141
14.3 Monitoring validity ........................................................... 142
14.4 Assigning a result automatically to a common varia-
ble ...................................................................................... 143
15 Templates 145
15.1 Sample data ...................................................................... 145
15.1.1 Sample identification list ...................................................... 146
15.1.2 Sample assignment table ..................................................... 147
15.2 Custom result templates .................................................. 149
15.2.1 Editing result templates ....................................................... 150
15.3 Input lines ......................................................................... 153
15.3.1 Editing the input signal ........................................................ 154
15.4 Output lines ...................................................................... 155
15.4.1 Editing the output signal ...................................................... 157
15.5 Custom calibration buffers .............................................. 158
15.5.1 Defining calibration buffers .................................................. 159
15.6 Report header ................................................................... 160
15.7 Custom electrode type ..................................................... 161
15.7.1 Limit values for the electrode rating ..................................... 162
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16 Methods 165
16.1 Creating a new method ................................................... 165
16.2 Saving a method ............................................................... 166
16.3 Loading a method ............................................................ 167
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17 Electronic signatures 182
18 Control 184
19 Favorites 188
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16.4 Editing a method .............................................................. 168
16.4.1 Inserting a command ........................................................... 169
16.5 Method options ................................................................ 170
16.5.1 Start options ........................................................................ 171
16.5.2 Stop options ........................................................................ 173
16.5.3 Sample data ........................................................................ 174
16.5.4 Method properties ............................................................... 178
16.5.5 Note .................................................................................... 180
16.5.6 Saving a determination automatically ................................... 180
17.1 Signing methods/determinations electronically ............ 182
17.2 Deleting electronic signatures ......................................... 183
19.1 Creating favorites ............................................................. 189
19.1.1 Editing favorites ................................................................... 189
20 Sample data 192
20.1 Entering sample data in the main dialog ....................... 192
20.2 Requesting sample data at the start of the determina-
tion .................................................................................... 193
21 Sample table 195
21.1 General .............................................................................. 195
21.2 Edit the sample data ........................................................ 198
21.3 Properties .......................................................................... 200
22 Determination run 203
22.1 Carrying out a single determination ............................... 203
22.2 Performing a sample series ............................................. 204
22.3 Canceling determinations manually ............................... 205
23 Live modifications 206
23.1 Editing the sample data of the running determina-
tion .................................................................................... 206
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23.2 Editing the sample table while a determination is run-
ning .................................................................................... 207
23.3 Live display ....................................................................... 208
23.4 Live parameters ................................................................ 210
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Table of contents
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24 Results and more determination data 212
24.1 More determination data ................................................ 213
24.1.1 Details ................................................................................. 214
24.2 Messages ........................................................................... 216
24.3 Local common variables .................................................. 217
24.4 Determination properties ................................................ 217
24.5 Loading a determination ................................................. 220
24.5.1 Determination list ................................................................ 221
24.6 Saving a determination .................................................... 225
24.7 Curves ................................................................................ 225
24.8 Recalculation and reevaluation ....................................... 227
25 Statistics 229
25.1 Displaying details for a result .......................................... 231
25.2 Deleting statistical data ................................................... 232
25.3 Adding a determination to a determination series ....... 232
26 Result table 234
26.1 Properties .......................................................................... 235
26.2 Saving the result table ..................................................... 239
26.3 Loading the result table ................................................... 239
27 Printing 240
27.1 General report options ..................................................... 242
27.2 Settings of the individual reports ................................... 243
27.3 List of all printable reports .............................................. 244
28 Manual control 248
28.1 Opening and closing the manual control ....................... 249
28.2 Measuring ......................................................................... 250
28.2.1 Parameter description .......................................................... 251
28.3 Dosing ............................................................................... 254
28.3.1 Continuous dosing .............................................................. 256
28.3.2 Dosing fixed volumes ........................................................... 258
28.3.3 Preparing ............................................................................. 260
28.3.4 Emptying ............................................................................. 261
28.3.5 Filling .................................................................................. 262
28.3.6 Replacing reagent ................................................................ 262
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28.4 Stirring ............................................................................... 263
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29 Parameters 276
Table of contents
28.5 Conditioning a titration cell ............................................ 264
28.5.1 Parameter description .......................................................... 265
28.6 Remote .............................................................................. 265
28.7 USB Sample Processor ..................................................... 266
28.7.1 Moving the lift ..................................................................... 268
28.7.2 Moving to a rack position .................................................... 270
28.7.3 External positions ................................................................ 272
29.1 Dynamic equivalence point titrations (DET) ................... 276
29.1.1 Start conditions ................................................................... 276
29.1.2 Titration parameters ............................................................ 279
29.1.3 Stop conditions ................................................................... 283
29.1.4 Potentiometric evaluation .................................................... 284
29.1.5 Control device ..................................................................... 289
29.1.6 Sensor ................................................................................. 290
29.1.7 Dosing device ...................................................................... 291
29.1.8 Stirrer .................................................................................. 292
29.2 Monotonic equivalence point titrations (MET) .............. 293
29.2.1 Start conditions ................................................................... 293
29.2.2 Titration parameters ............................................................ 296
29.2.3 Stop conditions ................................................................... 299
29.2.4 Potentiometric evaluation .................................................... 300
29.2.5 Control device ..................................................................... 305
29.2.6 Sensor ................................................................................. 306
29.2.7 Dosing device ...................................................................... 307
29.2.8 Stirrer .................................................................................. 308
29.3 Endpoint titrations (SET) .................................................. 309
29.3.1 Start conditions ................................................................... 309
29.3.2 Control parameters .............................................................. 310
29.3.3 Titration parameters ............................................................ 314
29.3.4 Stop conditions ................................................................... 315
29.3.5 Conditioning ....................................................................... 316
29.3.6 Cell ...................................................................................... 318
29.3.7 Control device ..................................................................... 318
29.3.8 Sensor ................................................................................. 318
29.3.9 Dosing device ...................................................................... 320
29.3.10 Stirrer .................................................................................. 321
29.4 Volumetric Karl Fischer titrations (KFT) ......................... 321
29.4.1 Start conditions ................................................................... 321
29.4.2 Control parameters .............................................................. 323
29.4.3 Titration parameters ............................................................ 326
29.4.4 Stop conditions ................................................................... 327
29.4.5 Conditioning ....................................................................... 328
29.4.6 Cell ...................................................................................... 330
29.4.7 Control device ..................................................................... 330
29.4.8 Sensor ................................................................................. 331
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Table of contents
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29.4.9 Dosing device ...................................................................... 332
29.4.10 Stirrer .................................................................................. 333
29.5 Coulometric Karl Fischer titrations (KFC) ....................... 334
29.5.1 Control parameters .............................................................. 334
29.5.2 Titration parameters ............................................................ 336
29.5.3 Stop conditions ................................................................... 337
29.5.4 Conditioning ....................................................................... 337
29.5.5 Cell ...................................................................................... 340
29.5.6 Control device ..................................................................... 341
29.5.7 Sensor ................................................................................. 341
29.5.8 Stirrer .................................................................................. 342
29.6 Bromine index determination (BRC) ............................... 343
29.6.1 Control parameters .............................................................. 343
29.6.2 Titration parameters ............................................................ 346
29.6.3 Stop conditions ................................................................... 347
29.6.4 Conditioning ....................................................................... 347
29.6.5 Cell ...................................................................................... 349
29.6.6 Control device ..................................................................... 350
29.6.7 Sensor ................................................................................. 350
29.6.8 Stirrer .................................................................................. 351
29.7 STAT titrations (STAT) ..................................................... 352
29.7.1 Start conditions ................................................................... 352
29.7.2 Control parameters .............................................................. 354
29.7.3 Titration parameters ............................................................ 356
29.7.4 Stop conditions ................................................................... 358
29.7.5 Monitoring .......................................................................... 359
29.7.6 Control device ..................................................................... 366
29.7.7 Sensor ................................................................................. 366
29.7.8 Dosing device ...................................................................... 367
29.7.9 Stirrer .................................................................................. 370
29.8 Manual titrations (MAT) .................................................. 371
29.8.1 Dosing parameters .............................................................. 371
29.8.2 Control device ..................................................................... 372
29.8.3 Sensor ................................................................................. 372
29.8.4 Dosing device ...................................................................... 373
29.8.5 Stirrer .................................................................................. 376
29.9 Measurements (MEAS) ..................................................... 377
29.9.1 Measuring parameters ......................................................... 377
29.9.2 Standard addition ................................................................ 381
29.9.3 Control device ..................................................................... 385
29.9.4 Sensor ................................................................................. 385
29.9.5 Stirrer .................................................................................. 387
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X
29.10 Calibration of sensors (CAL) ............................................ 388
29.10.1 Calibration parameters (CAL pH) .......................................... 388
29.10.2 Calibration parameters (CAL Conc) ...................................... 391
29.10.3 Calibration parameters (CAL Cond) ...................................... 394
29.10.4 Control device ..................................................................... 397
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Table of contents
29.10.5 Sensor ................................................................................. 397
29.10.6 Stirrer .................................................................................. 398
29.11 Electrode test for pH electrodes (ELT) ............................ 399
29.11.1 Electrode test parameters .................................................... 400
29.11.2 Control device ..................................................................... 401
29.11.3 Sensor ................................................................................. 402
29.11.4 Stirrer .................................................................................. 403
29.11.5 Further information ............................................................. 403
29.12 Evaluations (EVAL) ........................................................... 405
29.12.1 Fixed endpoint evaluation (EVAL FIX-EP) .............................. 407
29.12.2 pK value and half neutralization potential evaluation (EVAL
pK/HNP) .............................................................................. 409
29.12.3 Minimum and maximum evaluation (EVAL MIN/MAX) .......... 410
29.12.4 Break point evaluation (EVAL BREAK) ................................... 411
29.12.5 Rate evaluation (EVAL RATE) ................................................ 414
29.13 Calculations ....................................................................... 415
29.13.1 Calculations (CALC) ............................................................. 415
29.13.2 Calculations (CALC LIVE) ...................................................... 422
29.13.3 Formula editor ..................................................................... 424
29.14 Reports (REPORT) ............................................................. 430
29.14.1 General report options ......................................................... 430
29.14.2 Settings of the individual reports .......................................... 431
29.14.3 List of reports ...................................................................... 432
29.15 Dosing and Liquid Handling ............................................ 435
29.15.1 Preparing an exchange or dosing unit (PREP) ........................ 435
29.15.2 Emptying a dosing unit (EMPTY) .......................................... 436
29.15.3 Dosing a specified volume (ADD) ......................................... 437
29.15.4 Liquid Handling (LQH) .......................................................... 442
29.15.5 Monitored dosing (DOS) ...................................................... 445
29.16 Communication ................................................................ 462
29.16.1 Scanning remote lines (SCAN) .............................................. 463
29.16.2 Setting remote lines (CTRL) .................................................. 464
29.16.3 Scanning the RS-232 interface (SCAN RS) ............................. 466
29.16.4 Defining RS-232 commands (CONTROL RS) .......................... 467
29.17 Automation ....................................................................... 467
29.17.1 Rotating sample rack (MOVE) .............................................. 467
29.17.2 Moving the lift (LIFT) ............................................................ 470
29.17.3 Controlling pumps (PUMP) ................................................... 471
29.17.4 Resetting the rack (RACK) .................................................... 472
29.17.5 Defining the sample variable (SAMPLE) ................................ 472
29.17.6 Creating a subsequence (SUBSEQ) ....................................... 473
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29.18 Miscellaneous commands ................................................ 476
29.18.1 Controlling a stirrer (STIR) .................................................... 476
29.18.2 Pausing the method run (WAIT) ........................................... 477
29.18.3 Scan data (REQUEST) ........................................................... 477
29.18.4 Defining an acoustic signal (BEEP) ........................................ 478
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Table of contents
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29.18.5 Signing a determination (SIGN) ............................................ 479
29.18.6 Canceling the method run (END) ......................................... 479
30 Operation and maintenance 480
30.1 System initialization ......................................................... 480
30.2 Quality management and qualification with
Metrohm ........................................................................... 481
31 Troubleshooting 482
31.1 Editing methods ............................................................... 482
31.2 Sample table ..................................................................... 482
31.3 Results/Statistics ............................................................... 482
31.4 Printing .............................................................................. 483
31.5 Manual control ................................................................. 483
31.6 Miscellaneous ................................................................... 484
31.7 SET titration ...................................................................... 484
31.8 Karl Fischer titration ........................................................ 485
31.9 STAT titration ................................................................... 487
32 Appendix 488
32.1 Dosing unit ........................................................................ 488
32.1.1 Maximum dosing and filling rate .......................................... 488
32.1.2 Default parameters for preparing (PREP) and emptying
(EMPTY) ............................................................................... 488
32.2 Exchange unit ................................................................... 489
32.2.1 Maximum dosing and filling rate .......................................... 489
32.2.2 Default parameters for preparing (PREP) .............................. 489
32.3 Stirring rate ....................................................................... 489
32.4 Balance .............................................................................. 490
32.5 Result variables as parameter setting ............................ 491
32.6 Electrode calibration with USB Sample Processors ....... 492
32.7 Stored buffer series for pH calibration ........................... 494
32.8 Using AuditTrailViewer .................................................... 498
32.8.1 Installing AuditTrailViewer ................................................... 498
32.8.2 Opening the Audit Trail ....................................................... 499
32.8.3 Contents of the Audit Trail ................................................... 500
32.8.4 Filtering the Audit Trail ......................................................... 502
32.8.5 Exporting the Audit Trail ...................................................... 502
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32.9 Diagnosis ........................................................................... 503
32.9.1 LCD test .............................................................................. 503
32.9.2 Temperature monitoring ...................................................... 504
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33 Technical specifications 514
Table of contents
32.9.3 Formatting an external storage medium ............................... 504
32.9.4 Removing an external storage medium ................................ 505
32.9.5 Adjusting the touch screen .................................................. 505
32.9.6 Testing the touch screen ...................................................... 506
32.9.7 Software update (loading program versions and language
files) .................................................................................... 507
32.9.8 Simulating titration curves ................................................... 510
32.9.9 Service ................................................................................. 511
32.10 Arithmetic algorithms in the Titrando ............................ 512
33.1 Touch screen ..................................................................... 514
33.2 Interfaces .......................................................................... 515
33.3 Power supply .................................................................... 515
33.4 Safety specifications ........................................................ 515
33.5 Electromagnetic compatibility (EMC) ............................. 516
33.6 Ambient temperature ...................................................... 516
33.7 Dimensions ........................................................................ 516
34 Warranty (guarantee) 517
35 Accessories 519
Index 521
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Table of figures
Table of figures
Figure 1 Front 900 Touch Control ................................................................... 8
Figure 2 Rear 900 Touch Control .................................................................... 9
Figure 3 Reagent dosing for DET ................................................................... 11
Figure 4 Reagent dosing for MET .................................................................. 11
Figure 5 Reagent dosing for SET ................................................................... 12
Figure 6 Reagent dosing for KFT ................................................................... 13
Figure 7 Reagent dosing for STAT ................................................................. 14
Figure 8 Dosing unit – port assignment ......................................................... 51
Figure 9 Exchange unit – tubing connections ................................................ 56
Figure 10 Directory structure on the external storage medium ...................... 124
Figure 11 Live display "Preparing the dosing unit" ......................................... 261
Figure 12 Live display "Preparing the exchange unit" ..................................... 261
Figure 13 Equivalence point recognition and equivalence point numbering within
windows ....................................................................................... 288
Figure 14 Tubbs method for determining the equivalence point .................... 289
Figure 15 Equivalence point recognition and equivalence point numbering within
windows ....................................................................................... 304
Figure 16 Action "Exit method" or "Cancel command" .................................. 363
Figure 17 Action "Pause" .............................................................................. 363
Figure 18 Action "Wait" ................................................................................ 364
Figure 19 Evaluation of pK value / half neutralization potential ...................... 409
Figure 20 Evaluation of minimum and maximum ........................................... 410
Figure 21 Evaluation of a break point ............................................................ 411
Figure 22 Dosing criterion "Volume/Dosing rate" .......................................... 446
Figure 23 Dosing criterion "Volume/Dosing time" .......................................... 446
Figure 24 Dosing criterion "Dosing rate/Dosing time" .................................... 447
Figure 25 Action "Exit method" or "Cancel command" .................................. 455
Figure 26 Action "Pause" .............................................................................. 455
Figure 27 Action "Wait" ................................................................................ 455
Figure 28 Rotational speed depending on stirring rate .................................. 490
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1 Introduction
1.1 Instrument description
The 900 Touch Control is an operating unit with a touch-sensitive screen.
You can operate the following control devices with the 900 Touch Control:
￭ Titrandos
￭ USB Sample Processors
￭ 846 Dosing Interface
￭ 867 pH Module
￭ 856 Conductivity Module
With the 900 Touch Control, you can conveniently manage all of your
titrants, sensors, methods, etc. For example, you can connect a USB flash
drive to the USB connector as an external storage medium. You can use
this additional memory not only to store your methods and determinations, but also to create a backup together with all of the data and settings of your system. Thanks to the integrated Ethernet connector, the
device can be connected to your network, thus offering you the following
options, among others:
1 Introduction
￭ Saving data to a PC within the network
￭ Printing reports on a network printer
￭ Sending displayed messages as e-mails
1.2 Titration and measuring modes
The 900 Touch Control supports the following titration and measuring
modes. Whether a particular mode is available or not depends on the type
of the control device connected.
￭ 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)
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1.2 Titration and measuring modes
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￭ 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)
￭ STAT
Endpoint titration with constant maintenance of the measured value.
Measuring modes:
– pH (pH measurement)
– U (potentiometric voltage measurement)
￭ KFT
Volumetric water content determination according to Karl Fischer.
Measuring modes:
– Ipol (voltametric measurement with selectable polarization cur-
rent)
– Upol (amperometric measurement with selectable polarization
voltage)
￭ KFC
Coulometric water content determination according to Karl Fischer.
Measuring mode:
– Ipol (voltametric measurement with selectable polarization cur-
rent)
￭ BRC
Coulometric bromine index determination. Determining the amount of
double bonds in e.g. mineral oils.
Measuring mode:
– Ipol (voltametric measurement with selectable polarization cur-
rent)
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1 Introduction
￭ MEAS
Measuring modes:
– pH (pH measurement)
– U (potentiometric voltage measurement)
– Ipol (voltametric measurement with selectable polarization cur-
rent)
– Upol (amperometric measurement with selectable polarization
voltage)
– T (temperature measurement)
– Conc (Concentration measurement with or without standard
addition)
– Cond (conductivity measurement)
￭ CAL
Electrode calibration.
Measuring mode:
– pH (calibration of pH electrodes)
– Conc (calibration of ion-selective electrodes)
– Cond (calibration of conductivity measuring cells)
– ELT (Electrode test for pH electrodes)
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 operation 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 second to the instrument part in the figure.
Instruction step
Carry out these steps in the sequence shown.
Method Dialog text, parameter in the software
900 Touch Control
File ▶ New Menu or menu item
[Next] Button or key
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1.3 About the documentation
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WARNING
This symbol draws attention to a possible life-threatening 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.
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900 Touch Control
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2 Safety instructions
2.1 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.
2.2 Electrical safety
2 Safety instructions
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.
Mains voltage
WARNING
900 Touch Control
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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2.3 Tubing and capillary connections
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.
2.3 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.
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Check the connections regularly for leakage. If the instrument is used
mainly in unattended operation, then weekly inspections are mandatory.
2.4 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.
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900 Touch Control
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2.5 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 Safety instructions
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3 Overview of the instrument
8
6
5
3
1
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Figure 1 Front 900 Touch Control
Display
1
Touch screen.
Fixed key [Back]
3
Opens the next-higher dialog page.
Fixed key [Print]
5
Opens the print dialog.
Fixed key [STOP]
7
Cancels the running determination.
Fixed key [Home]
2
Opens the main dialog.
Fixed key [Help]
4
Opens the online help for the dialog displayed.
Fixed key [Manual]
6
Opens the manual control.
Fixed key [START]
8
Starts a determination.
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900 Touch Control
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4
3
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3 Overview of the instrument
Figure 2 Rear 900 Touch Control
Ethernet connector (RJ-45)
1
For connecting to a network.
Power switch
3
Switches the instrument on/off.
Connection cable
5
For the connection of the Touch Control to
a control device (socket "Controller").
USB connector (type A)
2
For connecting printers, USB sticks, USB
hubs, etc.
Type plate
4
Contains the serial number.
900 Touch Control
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4.1 Setting up the instrument
4 Installation
The connection between the Touch Control and the control device
(Titrando, etc.) is described in the respective manual, as is the configuration of the titration system with its peripheral devices, e.g. stirrers and
dosing devices.
4.1 Setting up the instrument
4.1.1 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.
4.1.2 Checks
Immediately after receipt, check whether the shipment has arrived complete and without damage by comparing it with the delivery note.
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4.1.3 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, free of vibrations, protected from corrosive atmosphere, and
contamination by chemicals.
The instrument should be protected against excessive temperature fluctuations and direct sunlight.
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900 Touch Control
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U/mV
V/mL
U/mV
5 Titrations
5.1 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.
5 Titrations
Figure 3
Reagent dosing for DET
5.2 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 4
Reagent dosing for MET
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5.3 Endpoint titration (SET)
t/s
EP
Continuous
dosing
Initial
dosing
V/mL
V/mL
U/mV
Control range
5.3 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 5 Reagent dosing for SET
5.4 Water determination according to Karl Fischer (KFT)
Karl Fischer Titration is a method for volumetric water determination. Conditioning is carried out automatically both before and after the actual titration. The reagent dosing is controlled in such a way that a predefined
endpoint is reached as quickly and as accurately as possible. The volume
steps and the rate of reagent dosing are regulated by the difference
between the current measured value and the predefined endpoint. This
means that titration is performed more slowly in the control range and
that smaller volumes are added. The titration is stopped at the endpoint
either drift-controlled or after a waiting time. The volume dosed until the
endpoint is used to calculate the water content of the sample.
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900 Touch Control
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EP
KFT Ipol
KFT Upol
EP
V/mL
Continuous
dosing
Initial
dosing
V/mL
V/mL
U/mV
t/s
I/µA
Control range
Control range
5 Titrations
Figure 6 Reagent dosing for KFT
5.5 Endpoint titration with constant maintenance of the measured value (STAT)
The pH STAT titration is the one most frequently utilized. Reagent is added
until a preset measured value (control point) has been reached. This control point is kept stable by continuously titrating off the substance set free
by the reaction with the reagent. The STAT titration keeps the control
point constant until the preset stop criterion has been reached. The STAT
titration is applied, for example, in analysis of enzymes. The dosing rate
resulting from the the control point being kept stable provides insight into
the activity of an enzyme.
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5.5 Endpoint titration with constant maintenance of the measured value (STAT)
Control point
U/mV
V/mL
Control range
V/mL
Initial
dosing
t/s
Incremental dosing
Figure 7 Reagent dosing for STAT
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900 Touch Control
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