Metrohm 900 User Manual

Name: Metrohm 900
Brand: Metrohm
SKU: 1624781
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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

Manual

8.900.8015EN / 2014-03-10

ebe

Teachware Metrohm AG CH-9100 Herisau

teachware@metrohm.com

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.

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

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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III

Table of contents

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
10 Sensors		66
10.1	Adding a new sensor .........................................................	67
10.2	Editing the sensor data ......................................................	68
10.3	Monitoring the working life ..............................................	69

IV	900 Touch Control

		Table of contents
10.4	Calibration data (for pHand 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 Device manager		79
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
12.2	External storage medium ................................................	123

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Table of contents
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
16 Methods		165
16.1	Creating a new method ...................................................	165
16.2	Saving a method ...............................................................	166
16.3	Loading a method ............................................................	167

VI	900 Touch Control

			Table of contents
	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	Electronic signatures		182
	17.1	Signing methods/determinations electronically ............	182
	17.2	Deleting electronic signatures .........................................	183
18	Control		184
19	Favorites		188
	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

23.1Editing the sample data of the running determina-

tion ....................................................................................

206

23.2Editing the sample table while a determination is run-

	ning ....................................................................................	207
23.3	Live display .......................................................................	208
23.4	Live parameters ................................................................	210

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VII

Table of contents
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
28.4	Stirring ...............................................................................	263

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			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 Parameters			276
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
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
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
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

900 Touch Control

Table of contents
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
32.9	Diagnosis ...........................................................................		503
32.9.1		LCD test ..............................................................................	503
32.9.2		Temperature monitoring ......................................................	504

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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 Technical specifications		514
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

900 Touch Control

XIII

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

XIV	900 Touch Control

1 Introduction

1.1Instrument 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:

Saving data to a PC within the network

Printing reports on a network printer

Sending displayed messages as e-mails

1.2Titration 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 current)

–Upol (amperometric measurement with selectable polarization voltage)

900 Touch Control

1.2 Titration and measuring modes

MET

Monotonic equivalence point titration. The reagent is added in constant volume steps.

Measuring modes:

–pH (pH measurement)

–U (potentiometric voltage measurement)

–Ipol (voltametric measurement with selectable polarization current)

–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 current)

–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 current)

–Upol (amperometric measurement with selectable polarization voltage)

KFC

Coulometric water content determination according to Karl Fischer. Measuring mode:

–Ipol (voltametric measurement with selectable polarization current)

BRC

Coulometric bromine index determination. Determining the amount of double bonds in e.g. mineral oils.

Measuring mode:

–Ipol (voltametric measurement with selectable polarization current)

2	900 Touch Control

1 Introduction

MEAS

Measuring modes:

–pH (pH measurement)

–U (potentiometric voltage measurement)

–Ipol (voltametric measurement with selectable polarization current)

–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)

1.3About 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.

1.3.1Symbols 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

900 Touch Control

1.3 About the documentation

WARNING

This symbol draws attention to a possible life-threat- ening hazard or risk of injury.

WARNING

This symbol draws attention to a possible hazard due to electrical current.

WARNING

This symbol draws attention to a possible hazard due to heat or hot instrument parts.

WARNING

This symbol draws attention to a possible biological hazard.

CAUTION

This symbol draws attention to possible damage to instruments or instrument parts.

NOTE

This symbol highlights additional information and tips.

4	900 Touch Control

2 Safety instructions

2.1General 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.

2.2Electrical 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.

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).

900 Touch Control

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.

2.3Tubing 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.

Check the connections regularly for leakage. If the instrument is used mainly in unattended operation, then weekly inspections are mandatory.

2.4Flammable 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 cupboard).

Keep all sources of flame far from the workplace.

Clean up spilled liquids and solids immediately.

Follow the safety instructions of the chemical manufacturer.

6	900 Touch Control

2 Safety instructions

2.5Recycling 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.

900 Touch Control

3 Overview of the instrument

	2	3	4	5	6	7	8
	Figure 1 Front 900 Touch Control

1	Display			2	Fixed key [Home]
	Touch screen.				Opens the main dialog.


3	Fixed key [Back]			4	Fixed key [Help]
	Opens the next-higher dialog page.				Opens the online help for the dialog dis-
					played.


5	Fixed key [Print]			6	Fixed key [Manual]
	Opens the print dialog.				Opens the manual control.


7	Fixed key [STOP]			8	Fixed key [START]
	Cancels the running determination.				Starts a determination.

8	900 Touch Control

3 Overview of the instrument

Figure 2 Rear 900 Touch Control

1Ethernet connector (RJ-45)

For connecting to a network.

2USB connector (type A)

For connecting printers, USB sticks, USB hubs, etc.

3Power switch

Switches the instrument on/off.

4Type plate

Contains the serial number.

5Connection cable

For the connection of the Touch Control to a control device (socket "Controller").

900 Touch Control

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.

4.1Setting up the instrument

4.1.1Packaging

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.

4.1.2Checks

Immediately after receipt, check whether the shipment has arrived complete and without damage by comparing it with the delivery note.

4.1.3Location

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.

10	900 Touch Control

5 Titrations

5.1Dynamic 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.

U/mV

V/mL

Figure 3 Reagent dosing for DET

5.2Monotonic 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-con- trolled (equilibrium titration) or after a waiting time. Equivalence points are evaluated automatically.

U/mV

V/mL

Figure 4 Reagent dosing for MET

900 Touch Control

5.3 Endpoint titration (SET)

5.3Endpoint 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.

U/mV

Control range

V/mL

t/s

Initial	Continuous	V/mL
dosing	dosing

Figure 5 Reagent dosing for SET

5.4Water 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.

12	900 Touch Control

5 Titrations

U/mV

KFT Ipol

Control range

V/mL

t/s

V/mL

Initial Continuous dosing dosing

I/µA

KFT Upol

Control range

V/mL

Figure 6 Reagent dosing for KFT

5.5Endpoint 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.

900 Touch Control

5.5 Endpoint titration with constant maintenance of the measured value (STAT)

U/mV

Control range

V/mL

Initial	Incremental dosing
dosing

Figure 7 Reagent dosing for STAT

Control point

V/mL

t/s

14	900 Touch Control

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