Metrohm 797VA User Manual

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797 VA Computrace

Hardware Manual

8.797.8001EN

Metrohm AG CH-9101 Herisau Switzerland Phone +41 71 353 85 85 Fax +41 71 353 89 01 info@metrohm.com www.metrohm.com

797 VA Computrace

Hardware Manual

8.797.8001EN 08.2009 zst

Teachware Metrohm AG CH-9101 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://products.metrohm.com under Literature/Technical documenta-

tion.

Inhaltsverzeichnis

Table of contents

1 Introduction ..........................................................1

1.1 Instrument description.................................................................. 1

1.2 Parts and controls......................................................................... 2

1.3 Information about the Instructions for Use................................... 7

1.3.1 Organization............................................................................ 7

1.3.2 Notation and pictograms......................................................... 8

1.4 Support documentation................................................................ 9

1.4.1 Application-Bulletins................................................................ 9

1.4.2 Application Notes .................................................................. 10

1.4.3 Monographs.......................................................................... 11

1.4.4 Reprints................................................................................. 11

2 Installation..........................................................12

2.1 Setting up the instrument ........................................................... 12

2.1.1 Packaging.............................................................................. 12

2.1.2 Check .................................................................................... 12

2.1.3 Location ................................................................................ 12

2.2 Installation of the 797 VA Computrace Stand............................. 12

2.2.1 Mains cable and mains connection ........................................ 12

2.2.2 Switching the instrument on/off ............................................ 13

2.2.3 Connection to the PC............................................................. 13

2.2.4 Equipping the measuring head .............................................. 14

2.2.5 Inert gas connection.............................................................. 17

2.3 Multi-Mode Electrode (MME)...................................................... 20

2.3.1 Construction and operating characteristics of the MME......... 20

2.3.2 Filling the MME with mercury................................................ 22

2.3.3 Mounting the capillary........................................................... 23

2.3.4 Filling capillary without vacuum............................................. 23

2.3.5 Filling the capillary using vacuum .......................................... 25

2.3.6 Storing the MME ................................................................... 29

2.3.7 Replenishing the mercury (without changing capillary) .......... 29

2.3.8 Changing capillary ................................................................. 29

2.3.9 Cleaning the MME................................................................. 31

2.4 Rotating disk electrode (RDE) ..................................................... 34

2.4.1 Construction and startup of the RDE...................................... 34

2.4.2 Regeneration of RDE ............................................................. 34

2.5 Reference electrode .................................................................... 36

2.5.1 Construction.......................................................................... 36

2.5.2 Startup procedure.................................................................. 37

2.6 Auxiliary electrode ...................................................................... 38

2.6.1 Construction.......................................................................... 38

2.6.2 Startup procedure.................................................................. 38

2.7 Stirrer ......................................................................................... 39

2.8 Connection of Dosing devices..................................................... 40

2.8.1 Electrical Connection ............................................................. 40

2.8.2 Tubing connection................................................................. 40

2.8.3 Change Dosing-/Exchange unit .............................................. 44

2.9 Connection of 863 Compact Autosampler .................................. 46

2.9.1 Electrical connection.............................................................. 47

2.9.2 Tubing connections ............................................................... 48

2.9.3 Software settings................................................................... 51

2.9.4 Operation of the 863 Compact Autosampler ......................... 52

2.10 Connection of 838 Advanced Sample Processor ......................... 53

797 VA Computrace / Hardware-Manual 8.797.8001EN

Inhaltsverzeichnis

2.10.1 General composition.............................................................. 55

2.10.2 System description for a combined system for Brightener and

Suppressor.............................................................................

2.10.3 System description for Suppressor determination .................. 59

2.10.4 System description for Brightener determination with MLAT. 61

2.10.5 System description for Brightener determination with LAT .... 65

2.11 Control lines................................................................................ 67

2.12 Connection of peripherals ........................................................... 67

2.13 Communication diagrams for automation .................................. 68

2.13.1 Communication diagram VA.................................................. 69

2.13.2 Communication diagram LAT................................................. 70

2.13.3 Communication diagram MLAT ............................................. 71

2.13.4 Communication diagram DT .................................................. 72

2.13.5 Communication diagram "RC Record response curve" ........... 73

2.13.6 Communication diagram "RC Sample with response curve"... 74

3 Safety ................................................................. 75

3.1 Electrical safety ...........................................................................75

3.2 Change fuses .............................................................................. 76

3.3 Cabinet temperature ................................................................... 76

3.4 Safety considerations concerning mercury ..................................77

3.4.1 Properties of mercury ............................................................ 77

3.4.2 Toxicity of mercury and its compounds.................................. 78

3.4.3 Handling of mercury .............................................................. 78

3.4.4 References dealing with mercury ........................................... 80

4 Appendix ............................................................ 82

4.1 Technical data............................................................................. 82

4.2 Scope of delivery.........................................................................88

4.2.1 VA Computrace 2.797.0010 .................................................. 88

4.2.2 VA Computrace 2.797.0020 .................................................. 93

4.2.3 VA Computrace 2.797.0030 .................................................. 95

4.3 Options .......................................................................................99

4.3.1 General options ..................................................................... 99

4.3.2 6.5327.000 MVA-Hg: Equipment for Hg-determination....... 102

4.3.3 6.5327.010 MVA-As: Equipment for As-determination ........ 104

4.3.4 6.5327.020 MVA-CVS: Equipment for CVS/CPVS ................. 106

4.3.5 Accessories for the automated addition of auxiliary solutions108

4.3.6 Automation for trace analysis .............................................. 109

4.3.7 Automation for electroplating bath analysis ........................ 110

4.4 Validation / GLP.................................................................. 112

4.5 Warranty and certificates.......................................................... 113

4.5.1 Warranty ............................................................................. 113

4.5.2 Declaration of Conformity ................................................... 114

4.5.3 Quality Management Principles ........................................... 115

4.6 Index......................................................................................... 115

797 VA Computrace / Hardware-Manual 8.797.8001EN

Inhaltsverzeichnis

List of figures

Fig. 1: Front of the 797 VA Computrace Stand ..................................... 2

Fig. 2: Rear of the 797 VA Computrace Stand ......................................3

Fig. 3: Right side view of the 797 VA Computrace Stand (fully

equipped)..................................................................................

Fig. 4: Left side view of the 797 VA Computrace Stand (fully

equipped)..................................................................................

Fig. 5: Connection to PC ....................................................................14

Fig. 6: Measuring head arm................................................................15

Fig. 7: Scheme showing the inert gas connections at the 797 VA

Computrace Stand...................................................................

Fig. 8: Multi-Mode-Electrode.............................................................. 21

Fig. 9: Adding the mercury.................................................................22

Fig. 10: Setting up the filling station.....................................................26

Fig. 11: Filling the capillary...................................................................26

Fig. 12: Measuring head arm with rotating disk electrode (RDE) ...........35

Fig. 13: Construction of the reference electrode...................................36

Fig. 14: Construction of the auxiliary electrode.....................................39

Fig. 15: Electrical connection of the 863 Compact Autosampler ...........47

Fig. 16: Tubing connections for operation of the 863 Compact

Autosampler............................................................................

Fig. 17: Installation of accessories for rinsing and siphoning off............48

Fig. 18: Adjusting the pipetting needle.................................................49

Fig. 19: Complete system for automation with the 838 Advanced

Sample Processor ....................................................................

Fig. 20: Tubing connections for the rinsing equipment with the 838

Advanced Sample Processor ....................................................

Fig. 21: Electrical connection for a combined system with the 838

Advanced Sample Processor ....................................................

Fig. 22: Tubing connections for Suppressor determination with the

838 Advanced Sample Processor (and DT) with a combined

system.....................................................................................

Fig. 23: Tubing connections for Brightener determination with the

838 Advanced Sample Processor with a combined system .......

Fig. 24: Measuring head for a combined system with the 838

Advanced Sample Processor ....................................................

Fig. 25: Electrical connection for Suppressor determination with the

838 Advanced Sample Processor .............................................

797 VA Computrace / Hardware-Manual 8.797.8001EN

III

Inhaltsverzeichnis

Fig. 26: Tubing connections for Suppressor determination (with DT)

with the 838 Advanced Sample Processor ...............................

Fig. 27: Tubing connections for Suppressor determination (with RC)

with the 838 Advanced Sample Processor ...............................

Fig. 28: Measuring head for Suppressor determination with the 838

Advanced Sample Processor....................................................

Fig. 29: Electrical connection for Brightener determination with the

838 Advanced Sample Processor and MLAT ............................

Fig. 30: Tubing connections for Brightener determination for

samples>10mL with the 838 Advanced Sample Processor

and MLAT...............................................................................

Fig. 31: Tubing connections for Brightener determination for

samples<10mL with the 838 Advanced Sample Processor

and MLAT...............................................................................

Fig. 32: Measuring head for Brightener determination for

samples>10mL with the 838 Advanced Sample Processor

and MLAT...............................................................................

Fig. 33: Measuring head for Brightener determination for

samples>10mL with the 838 Advanced Sample Processor

and MLAT...............................................................................

Fig. 34: Electrical connection for Brightener determination with the

838 Advanced Sample Processor and LAT ...............................

Fig. 35: Tubing connections for Brightener determination with the

838 Advanced Sample Processor and LAT ...............................

Fig. 36: Tubing connections for Brightener determination with the

838 Advanced Sample Processor and LAT ...............................

Fig. 37: Communication diagram for VA.............................................. 69

Fig. 38: Communication diagram for LAT............................................. 70

Fig. 39: Communication diagram for MLAT ......................................... 71

Fig. 40: Communication diagram for DT .............................................. 72

Fig. 41: Communication diagram for "RC Record response curve"........ 73

Fig. 42: Communication diagram for "RC Sample with response

curve".....................................................................................

797 VA Computrace / Hardware-Manual 8.797.8001EN

1.1 Instrument description

1 Introduction

1.1 Instrument description

797 VA Computrace is a PC controlled system for voltammetry, which consists of the following parts:

1.797.0010 VA Computrace Stand with accessories

6.2151.020 Connecting Cable

6.6053.030 797 VA Computrace Software (current version)

For a detailed description of the PC software «797 VA Computrace Software» see the 797 Software Manual.

This 797 Hardware Manual describes the installation and maintenance of the 797 VA Computrace Stand and its accessories. The central element of this Stand is the Multi-Mode Electrode (MME), which combines the dropping mercury electrode (DME/SMDE) and the stationary hanging mercury drop electrode (HMDE) in a single construction. The rotating disk electrode (RDE) can also be used in the stand.

The 797 VA Computrace Stand is controlled with the PC-Software «797 VA Computrace Software», parameters necessary for the VA measurement are sent from the PC to the VA Computrace via USB connection. The data acquisition at the 797 VA Computrace Stand is started and controlled by the PC-Software «797 VA Computrace Software», which receives and stores the measurement data. At the end of the determination, the recorded data are sent back to the PC where they are evaluated and saved in a determination file.

Operation of the 797 VA Computrace Stand follows the potentiostatic 3-electrode principle in which the voltage of the working electrode is controlled by means of a virtually currentless reference electrode to the preset desired value and the current flows across a separate auxiliary electrode.

797 VA Computrace / Hardware-Manual 8.797.8001EN

1 Introduction

1.2 Parts and controls

In this section you will find the numbers and designations of the parts and controls of the 797 VA Computrace Stand. The numbering applies throughout the instructions for use, i.e. bold numbers in the text (e.g. 7 ) refer to the parts and controls illustrated here.

Fig. 1: Front of the 797 VA Computrace Stand

Mains pilot lamp

lit up when instrument switched on

Cover of measuring head arm

hinged

Release slide

to release fixture of the lifted measuring head arm

Stopper (6.2709.080)

to close the pipetting opening

Gas wash bottle (6.2405.030)

for inert gas supply (filling with dist. water, see section

Measuring vessel

when measuring head arm is fully raised, the measuring vessel can be pulled forward out of the holder

Drip pan (6.2711.040)

2.2.5)

Holder for measuring vessel

797 VA Computrace / Hardware-Manual 8.797.8001EN

1.2 Parts and controls

12 9 13

16 10 11

Type: 1.797.0010 Nr.:___________

MSB 1

MSB 2 MSB 3

USB 2

USB 1

Made by Metrohm Herisau Switzerland

Fig. 2: Rear of the 797 VA Computrace Stand

Connection for inert

gas lead-off

Connection for optional waste

solution lead-off

Connection for inert gas supply

required pressure: p = 1 ± 0.2 bar

MSB1 – MSB3

(Metrohm Serial Bus) Connections for Dosing devices

Remote

Fuse 100 - 240 V: 1.6 A(TH)

f = 50-60 Hz S= 120 VA

WARNING - Fire Hazard -

For continued protection replace only with the same type and rating of fuse

Fuse cover

Changing the fuses, see section

Mains connection plug

mains connection, see section

Remote

Connection for Sample Changer and Rinsing Equipment

Connection socket for connection cable

6.2151.020 to PC, see section

3.2

2.1.1

2.2.3

Serial number

USB1 and USB2

Connections for peripherals like

Mains switch (on/off)

printer, ..., see section

2.12

on/off switching of instrument (the pilot

1 is lit up when the instrument is

lamp on)

797 VA Computrace / Hardware-Manual 8.797.8001EN

1 Introduction

22 23 24 25

26 27

28 29 26 30 31

Fig. 3: Right side view of the 797 VA Computrace Stand (fully equipped)

38 39 40 41 20

32 6 33 34 30 35 36 37

53 52 51 50 49 35

47 32 43

4648

29 45 44

Fig. 4: Left side view of the 797 VA Computrace Stand (fully equipped)

797 VA Computrace / Hardware-Manual 8.797.8001EN

1.2 Parts and controls

Stopper (6.2709.080) to close the pipetting opening

Gas wash bottle (6.2405.030)

for inert gas supply (must be filled halfway with dist. H see section

Electrode cable ”WE”

2.2.5)

connection for working electrode

Electrode cable ”RE”

connection for reference electrode

Drive belt (6.1244.020)

connection between drive wheel stirrer 28

PTFE tube (6.1819.000)

for inert gas delivery to gas wash bottle

6 (attached)

35 and

(MME or RDE)

FEP tubing (6.1805.180)

Multi-Mode Electrode (MME)

for inert gas supply to MME

(6.1246.020)

details, see section

FEP tubing (6.1805.180)

for inert gas supply to measuring vessel (attached)

2.3

Drive wheel of drive motor

FEP tubing (6.1805.040)

for inert gas delivery to gas wash bottle

6 attached.

Measuring head arm

carrier plate with permanently attached measuring head, raisable

Measuring head

measuring vessel upper half made of PTFE; with openings for electrodes, stirrer, gas and liquid supply lines

Dummy stopper (6.1446.040)

Reference electrode

comprising 6.0728.020 Ag/AgCl Reference system and 6.1245.010 Electrolyte vessel (details, see section

Nipple (6.2730.030)

2.5)

for mounting the 4-way microtip dummy stopper

Stirrer (6.1204.200)

30 or a

Slotted screw for controlling the

inert gas flow

: The factory setting of ca. 20 L/h

Note should not be changed without good reason!

FEP tubing (6.1805.020)

for inert gas lead-off (attached)

FEP tubing (6.1805.090)

for inert gas lead-off (attached)

FEP tubing (6.1805.180)

for inert gas supply to tapping mechanism (attached)

Electrode cable ”AE”

connection for auxiliary electrode

FEP tubing (6.1805.180)

for inert gas supply to MME

PTFE tube (6.1819.000)

(attached)

4-way microtip (6.1824.000)

Auxiliary electrode

for details see section

Dummy stopper (6.1446.040)

2.6

for delivery of solutions; with 4 lengths of PTFE tubing with connecting nipples for Dosing devices

797 VA Computrace / Hardware-Manual 8.797.8001EN

Dummy stopper (6.1446.040)

1 Introduction

PTFE tube (6.1819.010)

for optional supply of the waste solution to gas wash bottle

Gas wash bottle (6.2405.030)

47 (attached)

for separating mercury from the waste solution (attached)

PTFE tube (6.1819.010)

for optional siphoning off the waste solution from gas wash bottle

(attached)

Dummy cell connection ”WE-D”

differential mode simulation (peak/wave)

Dummy cell connection ”WE-L”

linear mode simulation (RC element)

Dummy cell connection ”RE”

Dummy cell connection ”AE”

Slotted screw for controlling the

tapping power in the DME or SMDE case

: The factory setting should not be

Note changed without good reason!

797 VA Computrace / Hardware-Manual 8.797.8001EN

1.3 Information about the Instructions for Use

Please read through these Instructions for Use carefully before you put the 797 VA Computrace Stand into operation. The Instructions for Use contain information and warnings to which the user must pay attention in order to assure safe operation of the instrument.

1.3.1 Organization

This 8.797.8001EN Hardware Manual for the 797 VA Computrace Stand provides a comprehensive overview of the installation, operation, and technical specifications of these instruments. The Instructions for Use are divided into the following 4 sections:

Section

1 Introduction

2 Installation

General instrument description Numbers and designations of the parts and controls Safety instructions

Installation of 797 VA Computrace Stand Installation of working, reference and auxiliary electrodes Attachment of 700 and 800 Dosinos Attachment of 685 and 805 Dosimats Attachment of the 863 Compact Autosampler Attachment of the 838 Advanced Sample Processor

Section

To find the required information on the instrument please use either the Table of contents or the Index at the back.

3 Safety

Electrical safety Safety considerations in the handling of mercury

4 Appendix

Scope of delivery, options, validation, warranty, certification, index

797 VA Computrace / Hardware-Manual 8.797.8001EN

1 Introduction

1.3.2 Notation and pictograms

The following notations and pictograms (symbols) are used in these Instructions for Use:

Mode Parameter or entry value

15 Part or control

Hazard

This symbol draws attention to a possible danger to life or of injury if the associated directions are not followed correctly.

Warning This symbol draws attention to possible damage to instruments or instrument parts if the associated directions are not followed correctly.

Caution This symbol marks important information. First read the associated directions before you continue.

Comment This symbol marks additional information and tips.

797 VA Computrace / Hardware-Manual 8.797.8001EN

1.4 Support documentation

1.4.1 Application-Bulletins

The «Application Bulletins» is a collection of analytical methods, application examples and literature references. Of Metrohm's approximately 200 Application Bulletins, ca. 60 refer to Polarography and Voltammetry. All these Application Bulletins are available on request free of charge from your Metrohm supplier.

The examples listed here substantiate the versatility of the polarographic and voltammetric methods for a range of applications including both inorganic and organic substances. At any time you will find an updated list of the Application Bulletins with the option for download in the Internet under «

Most of the methods required to run the applications described in the Application Bulletins are installed when the 797 VA Computrace software is installed.

No. Title

36 Polarographic analysis – Half-wave potentials of inorganic substances

50 Polarographic determination of lead in petrochemical products

57 Polarographic determination of nicotine

www.metrohm.com ».

60 Polarographic determination of fructose

70 Polarographic nitrate determination in water samples, soil and plant extracts,

vegetable juices, meat and sausage products, fertilizers, liquid manure etc.

73 Polarographic analysis – Half-wave potentials of organic substances

74 Polarographic and stripping voltammetric analysis methods for thallium, antimony,

bismuth and iron (copper, vanadium)

76 Polarographic determination of nitrilotriacetic acid (NTA) and ethylenediamine-

tetraacetic acid (EDTA)

96 Stripping voltammetric analysis of mercury

97 Voltammetric determination of tocopherols (vitamin E) in edible oils and fats

98 Determination of ascorbic acid (vitamin C) and its compounds

105 Determination of permissible lead and cadmium levels in crockery and glassware

110 Polarographic determination of free cyanide

113 Determination of lead, cadmium and copper in foodstuffs, waste water and

sewage sludge by anodic stripping voltammetry after digestion

114 Polarographic determination of five metal ions (copper, cobalt, nickel, zinc and

iron) in a single operation

116 Polarographic determination of chromium in small quantities

117 Determination of selenium by stripping voltammetry

123 Voltammetric determination of iron and manganese in water samples

126 Polarographic determination of quinine

127 Polarographic determination of nitrite in water samples, meat and sausages

131 Voltammetric determination of aluminum

132 Polarographic determination of molybdenum in strongly ferruginous substances

and ferrous metals

136 Polarographic determination of styrene in polystyrenes and copolymers

141 Analysis of edible fats and oils

797 VA Computrace / Hardware-Manual 8.797.8001EN

1 Introduction

No. Title

146 Direct polarographic determination of trace amounts of molybdenum in water

147 Simultaneous trace determination of seven metal ions (Zn, Cd, Pb, Cu, Ni, Co, Fe) in

«electronic grade» materials with the aid of stripping voltammetry

176 Simultaneous determination of lead and tin by anodic stripping voltammetry

179 Polarographic determination of maleic and fumaric acid alone or in mixtures

186 Determination of aluminum in water samples by adsorptive stripping voltammetry

190 Polarographic determination of 4-carboxybenzaldehyde in terephthalic acid

191 Polarographic determination of cystine and cysteine simultaneously

192 Determination of thiourea in the lower ppm and ppb range by polarography and

stripping voltammetry

196 Polarographic determination of formaldehyde

199 Polarographic determination of sulphide and sulphite

207 Stripping voltammetric analysis of silver

213 Polarographic determination of nicotinamide

215 Polarographic determination of folic acid (vitamin B9, vitamin BC)

218 Polarographic determination of thiamine (vitamin B1)

219 Polarographic determination of riboflavin (vitamin B2)

220 Voltammetric determination of platinum and rhodium in the ultratrace range

221 Standard methods in water analysis – use of Metrohm instruments

224 Polarographic determination of pyridoxine (vitamin B6)

226 Determination of arsenic by anodic stripping voltammetry at the rotating gold

electrode

231 Voltammetric determination of zinc, cadmium, lead, copper, thallium, nickel and

cobalt in water samples according to DIN 38406 E 16

241 Determination of cadmium and lead at the «Ultra Trace» graphite electrode by

anodic stripping voltammetry

242 Determination of tungsten at the «Ultra Trace» graphite electrode by anodic

stripping voltammetry

243 Determination of chromium at the «Ultra Trace» graphite electrode by cathodic

stripping voltammetry

250 Polarographic determination of diazepam in body fluids and pharmaceutical

preparations

251 Polarographic determination of cinchocaine (dibucaine) in pharmaceutical prepara-

tions

254 Determination of zinc, cadmium, lead and copper by anodic stripping voltammetry

using carbon electrodes

266 Voltammetric determination of titanium and uranium

276 Validation of Metrohm VA instruments using Standard Operating Procedures

1.4.2 Application Notes

The «Application Notes» present application information in concentrated form. In the field of voltammetry, there are at present approximately 120 Application Notes (in English), which can be viewed in the Internet under «

797 VA Computrace / Hardware-Manual 8.797.8001EN

www.metrohm.com » and cop-

1.4 Support documentation

ied from there. All these Application Notes are printed in the 8.757.2003 VA Applications Collection supplied with the instrument. All methods required to run the ap-

plications described in the Application Notes are installed when the 797 VA Computrace software is installed.

1.4.3 Monographs

The «Metrohm Monographs» listed below impart theoretical fundamentals and general information on measurement techniques and sample preparation of polarography and voltammetry. All these monographs are available on request free of charge from your Metrohm supplier.

Title

First aid for polarography and voltammetry (8.693.1071)

Sample preparation techniques in voltammetric trace analysis

Inorganic Adsorptive Stripping Analysis

Organic Stripping Analysis

Stripping Voltammetry

Electrode Reaction Kinetics determined by Cyclic Voltammetry

The Application of VA Techniques to the Galvanic/Plating Industry

Practical voltammetry (8.757.5003)

Introduction to Polarography and Voltammetry (8.027.5003)

Voltammetric analysis methods in electroplating (8.108.5002EN)

1.4.4 Reprints

The following reprints reporting on practical applications are available on request free of charge from your Metrohm supplier.

Title

Investigations of oxidative UV photolysis: I. Sample preparation for the voltammetric determination of Zn, Cd, Pb, Cu, Ni and Co in waters

Investigations of oxidative UV photolysis: II. Sample preparation for the voltammetric determination of mercury in water samples

Determination of Zn, Cd, Pb, and Cu in soils and sewage sludges by microprocessorcontrolled voltammetry in comparison with AAS

Voltammetric instrument for training and trace analysis

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

This section offers a full description of the 797 VA Computrace Stand and provides detailed information on the various electrodes and the stirrer. Reliable operation of the instrument is assured only if you follow the instructions in this section exactly.

2.1 Setting up the instrument

2.1.1 Packaging

The 797 VA Computrace Stand is supplied together with the separately packed accessories in special packages designed to ensure excellent protection. These contain shock-absorbing foam linings. The instrument itself is packed in an evacuated polyethylene bag. As only these special packaging guarantees indemnified transport of the instrument, it is essential you store it in a safe place.

2.1.2 Check

After recipt, immediately check whether the shipment is complete and has arrived without damage (compare with delivery note and list of accessories in sections the case of transport damage, see instructions in section

4.5.1 "Warranty".

2.1.3 Location

Place the 797 VA Computrace on a laboratory bench in a position suitable for operation and which is free from vibrations, protected against corrosive atmospheres and contamination by chemicals. The drip pan front side of the 797 VA Computrace Stand to catch drops (see

8 (6.2711.040) has to be placed at the

Fig. 1).

2.2 Installation of the 797 VA Computrace Stand

If the 797 VA Computrace Stand is connected to the power supply, the instrument may not be opened or parts removed, as there is a danger of contact with live components. Before you open the 797 VA Computrace Stand to change components or for maintenance or repair work, always switch off the instrument by setting the mains switch from the mains connection plug

14 to the OFF position and then disconnect the mains cable

16 of the 797 VA Computrace Stand.

4.2). In

2.2.1 Mains cable and mains connection

The instrument is supplied with one of three mains cables:

• 6.2122.020 with plug SEV 12 (Switzerland, …)

• 6.2122.040 with plug CEE(7), VII (Germany, …)

• 6.2133.070 with plug NEMA 5-15 (USA, …)

which are three-cored and fitted with a plug with a grounding pin. If a different plug has to be fitted, the yellow/green lead (IEC standard) must be connected to protective earth (protection class 1).

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.2 Installation of the 797 VA Computrace Stand

Any break in the grounding inside or outside the instrument can make it a hazard!

Plug the mains cable into mains connection plug (see

16 of the 797 VA Computrace Stand

Fig. 2).

2.2.2 Switching the instrument on/off

The 797 VA Computrace Stand is switched on and off using mains switch 14. When the instrument is switched on, the pilot lamp

1 lights up.

2.2.3 Connection to the PC

The 797 VA Computrace Stand is connected to the PC via USB Cable 6.2151.020. Proceed as follows:

The 797 VA Computrace Stand must not be connected until the Software is installed.

1 Software installation

• Switch on PC and start operating system (Windows™ 2000, XP Professional or Vista Professional)) without connection of the 797 VA Computrace via USB cable.

• Insert installation CD into CD drive.

• If the autorun option for the CD drive is disabled, select

Browse for the

• Click on "

Setup.exe file on the installation CD and click on <OK>.

797" and follow the instructions given in the setup program. The

software package will be installed in the desired directory (the default directory is

Program Files/Metrohm/797 VA Computrace).

2 Connection of the 797 VA Computrace

• Connect 797 VA Computrace to the PC using the 6.2151.020 USB cable and switch on the 797 VA Computrace. The PC detects a new USB device and starts the setup wizard. Insert installation CD into CD drive and follow the wizard instructions always selecting the recommended default options.

• Start the 797 VA Computrace Software.

<Start> and Run.

The setup wizard is started three times when installing the instrument driver. All three installation steps must be conducted to ensure proper operation.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

797

6.2151.020 USB Cable

Fig. 5: Connection to PC

In case your computer does not start if the 797 VA Computrace stand is switched on, it might is due to an older version of the BIOS. These BIOS versions are not able to handle USB Hubs in a correct way.

In that case, start the computer first, and switch on 797 VA Computrace stand as soon as Windows booting is finished.

2.2.4 Equipping the measuring head

The fixtures inserted in the openings and connections of the measuring head 24 in the 797 VA Computrace Stand depend on the working electrode selected (MME or RDE) (see Electrode is illustrated in section tating disk electrode in section

When equipping the measuring head for the first time, the best procedure is as follows:

1 Preparations

2 Insert dummy stoppers

Fig. 6). The fully equipped measuring head for operation with a Multi-Mode

1.2 (Fig. 3 und Fig. 4), that for operation with a ro-

2.4 (Fig. 12).

• Prepare Multi-Mode Electrode MME 21 (details, see section 2.3) or rotating disk electrode RDE (details, see section

• Prepare reference electrode

• Tilt back cover

2 of measuring head arm.

• Screw dummy stopper 45 (6.1446.040) into opening 55.

• Screw dummy stopper

44 (6.1446.040) into opening 56.

2.4) for operation.

26 (details, see section 2.5.2) for operation.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.2 Installation of the 797 VA Computrace Stand

3 Insertion of 4-way microtip (option)

For automatic solution addition with Dosinos or Dosimats, the 6.1824.000 4way microtip has to be installed. Proceed as follows:

• Remove stopper from nipple

27 and insert 4-way microtip 30 into nipple as

far as it will go.

• Tighten nipple using a 6.2739.010 Wrench until the 4-way microtip can no longer move.

• Pull the 4 lengths of PTFE tubing of the 4-way microtip in succession from above through the opening

2.8).

tion

68 (connection of Dosinos or Dosimats see sec-

4 Install stirrer or RDE

in operation with MME:

• Insert stirrer (6.1204.200) in opening

• Stretch drive belt

of the stirrer

32 (6.1244.020) between drive wheel 35 and drive shaft

63 as far as it will go.

in operation with RDE:

• Screw electrode tip also section

2.4).

• Insert RDE in opening

• Stretch drive belt

98 (6.1204.XXX) to drive shaft 99 (6.1204.210) (see

63 as far as it will go.

32 (6.1244.020) between drive wheel 35 and drive shaft

99 of the RDE.

• Attach electrode cable

20 (WE) to the RDE: push cable lug under the screw

and then tighten screw firmly.

59 60 61 62 65 66 67 68 69 70

Fig. 6: Measuring head arm

Measuring head arm

Measuring head

6463

Opening

for auxiliary electrode

43 (6.0343.000 Pt

- auxiliary electr. or optional GC electr. comprising 6.1241.020 Electrode holder and 6.1247.000 GC tip)

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

Threaded opening

for dummy stopper

Threaded opening

for dummy stopper

Pipetting opening

45 (6.1446.040)

44 (6.1446.040)

for the manual addition of solutions, closed with stopper

Opening

4 (6.2709.080)

in operation with MME: for Multi-Mode Electrode

21 (6.1246.020) in operation with RDE: for 6.2709.040 Stopper

Threaded opening

for FEP tubing

22 (6.1805.180, already permanently attached); inert gas supply to measuring vessel

Threaded opening

for dummy stopper

Opening

for reference electrode

25 (6.1446.040)

26 (Ag/AgCl

reference system and 6.1245.010 Electrolyte vessel)

Threaded opening

for nipple stopper or 4-way microtip

27 (6.2730.030) with dummy

(6.1824.000)

Threaded opening

for FEP tubing

40 ((6.1805.180, already permanently attached); inert gas supply for tapping mechanism

Threaded opening

for FEP tubing

39 (6.1805.090, already perm. attached); inert gas lead-off

Threaded opening

for FEP tubing

22 (6.1805.180, already permanently attached); inert gas supply from gas wash bottle vessel

Threaded opening

for FEP tubing

36 (6.1805.040, already

6 to measuring

permanently attached); inert gas supply to gas wash bottle

Opening

for feed-through of tubing connections of 4-way microtip

Threaded opening

30 (6.1824.000)

for FEP tubing (6.1805.180); optional waste solution lead-off

Threaded opening

for FEP tubing

38 (6.1805.090, already permanently attached); optional waste solution supply from gas wash bottle to waste

Opening

in operation with MME: for stirrer

28 (6.1204.200) in operation with RDE: for rotating disk electrode, comprising drive shaft trode tip

99 (6.1204.210) and elec-

98 (6.1204.XXX)

5 Install reference electrode

• Insert reference electrode 26 in opening 61.

• Attach electrode cable

under the screw and then tighten screw firmly.

• Turn reference electrode so that the electrode cable points to the rear and not to the side (in the latter position it may become kinked and damaged when cover

31 (RE) to reference electrode: push cable lug

2 is closed).

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.2 Installation of the 797 VA Computrace Stand

6 Install auxiliary electrode

• Insert auxiliary electrode 43 (6.0343.000 Pt auxiliary electrode or GC auxil- iary electrode, see section

• Attach electrode cable

2.6) in opening 54.

41 (AE) to auxiliary electrode: push cable lug under

the screw and then tighten screw firmly.

• Turn auxiliary electrode 39 so that the electrode cable 37 points to the rear and not to the side (in the latter position it may become kinked and damaged when cover

2 is closed).

7 Install MME or dummy stopper

in operation with MME:

• Carefully insert Multi-Mode Electrode

21 (6.1246.020) in opening 58 (the underside of the capillary must not touch the measuring head during insertion) and push in as far as it will go.

• Screw FEP tubing

34 (6.1805.180) for inert gas supply into connection 71

of the MME.

• Screw FEP tubing

42 (6.1805.180) for inert gas supply into connection 72

of the MME.

• Attach electrode cable

20 (WE) to screw connection 88 of the MME: push

cable lug under the screw and then tighten screw firmly.

in operation with RDE:

• Insert stopper

97 (6.2709.040, option) into opening 58 as far as it will go

so that the two blind holes point to the rear of the stand.

• Screw FEP tubing

34 (6.1805.180) into upper hole of stopper 97. 42 (6.1805.180) into lower hole of stopper 97.

8 Install measuring vessel

• Tilt back measuring head arm 23.

• Slide measuring vessel

solution or dist. H the reference electrode are immersed in the liquid.

• Lower measuring head arm

2.2.5 Inert gas connection

Nitrogen (N2) is generally used as the inert gas to de-aerate the analyte solution and for operation of the MME. The nitrogen must be of sufficient purity.

w(N

) ≥ 0.99996 (= 99.996%)

for general polarography/voltammetry

w(N

) ≥ 0.99999 (= 99.999% = "5 × 9")

for analyses in organic solvents; for determinations involving very high current amplification (e.g. in the determination of very low concentrations without preceding enrichment)

For electroplating bath applications, using CVS or CPVS, no inert gas connection is required.

The scheme for de-aeration of the analyte solution and the inert gas connections at the 797 VA Computrace Stand needed for operation of the MME is shown in The inert gas connections are established as follows:

7 into holder 5 from the front and fill with analyte

O (storage solution) until the tips of the MME or RDE and

23 and cover 2.

Fig. 7.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

1 Fill gas wash bottle

• Unscrew gas wash bottle 6 from measuring head arm 23.

• Fill gas wash bottle half full with dist. H

O (for long-term measurements

with supporting electrolytes such as Acetic acid / Acetate buffer or Ammonia / Ammonium chloride buffer, fill with supporting electrolyte; for measurements in organic solvents fill with the used solvent).

• Screw gas wash bottle back on measuring head arm.

2 Connect inert gas supply

• Attach one end of 6.1801.080 PVC tubing to connection 11 of the 797 VA Computrace Stand.

• Attach the other end of the 6.1801.080 PVC tubing to connection of the inert gas bottle.

• Set inert gas pressure at gas bottle using the reducing valve to

p = 1 ± 0.2 bar.

• Open gas supply line at gas bottle.

3 Connect inert gas lead-off (option)

• Attach a length of suitable tubing (e.g. Metrohm 6.1805.030, length 150 cm) to connection

9 for inert gas lead-off.

• Route the other end of the lead-off tubing to a fume cupboard.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.2 Installation of the 797 VA Computrace Stand

Fig. 7: Scheme showing the inert gas connections at the 797 VA Com-

putrace Stand

6 Gas wash bottle (6.2405.030)

for inert gas supply (must be filled only halfway with dist. H

O or

supporting electrolyte, see also Fig. 3)

37 Slotted screw for controlling the inert gas flow for de-aeration

(see also Fig. 3)

Note

: The factory setting of ca. 20 L/h should not be changed

without good reason!

53 Slotted screw for controlling the tapping power in the DME

case (see also

Note

: The factory setting should not be changed without good

Fig. 4)

reason!

Connection for inert gas supply

of the MME for raising and lowering the sealing needle in the MME (see also

section

Connection for inert gas supply

2.3.1 and Fig. 8)

of the MME

for pressurizing the mercury (see also section

2.3.1 and Fig. 8)

V1, V2, V3, V4 Valves

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

2.3 Multi-Mode Electrode (MME)

The Multi-Mode Electrode combines the most important polarographic and voltammetric mercury electrodes in a single construction:

• HMDE Hanging mercury drop electrode Mercury is forced through a glass capillary until a drop forms at the capillary tip and the entire voltage sweep performed on this single stationary drop; in general with preceding enrichment (stripping voltammetry).

• DME Dropping mercury electrode The classical electrode, the mercury drops fall from the glass capillary at a controlled rate.

• SMDE Static mercury drop electrode The latest electrode, it combines the features of the DME and the HMDE: during the measurement, the drop surface is constant and stationary (as with the HMDE); however, for the complete voltage sweep several drops are needed (renewal as with the DME).

2.3.1 Construction and operating characteristics of the MME

The construction of the 6.1246.020 Multi-Mode Electrode is shown in Fig. 8. The mercury in the reservoir end. The mercury flow is controlled by the sealing needle lowered pneumatically. The different types of electrodes (HMDE, DME, SMDE) are implemented by timed opening or closing of the mercury flow using this sealing needle.

The operating characteristics of the MME are illustrated by

V1 (inert gas supply) is opened, the mercury in the reservoir 81 is pressurized. In

valve the standby mode, a back pressure is built up in the interior of the slotted screw which causes the built-in spring to press the sealing needle opening of the glass capillary the valve gas pressure in the mercury reservoir PTFE membrane of the slotted screw The tapping mechanism of the DME and SMDE is triggered by brief opening and closing of valve

The mercury drops formed at the end of the capillary are very small and stable and thus afford a very good signal/noise ratio. The mercury hermetically sealed in the reservoir comes into contact only with inert gas and other inert materials and suffices for around 200'000 drops.

V3 allows the inert gas to escape thus releasing the back pressure. The inert

V4.

81 flows through the glass capillary 87 forming a drop at its

75 which can be raised or

Fig. 7 and Fig. 8. After

75 onto the capillary

87 thus preventing the outflow of mercury. Switching

81 presses the sealing needle 74 fixed to the

75 upwards and the mercury can now flow out.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.3 Multi-Mode Electrode (MME)

71 88

71 Connection for inert gas supply

72 Connection for inert gas supply

(for all MME operating modes)

Locking ring (4.420.2920)

for slotted screw

Slotted screw (6.1247.040)

with PTFE membrane and built-in spring

Sealing needle (6.1247.020)

Screw thread for slotted screw 74

Unused connection

Screw thread for slotted screw 79

Slotted screw (4.420.2960)

for replenishing the mercury with capillary fitted

Fig. 8: Multi-Mode-Electrode

797 VA Computrace / Hardware-Manual 8.797.8001EN

Electrical contact pin for mercury

Mercury reservoir

Screw thread for retaining nut 86

Insert ring (4.420.3011)

Sealing ring (4.420.2800)

made of silicone rubber

Locking ring (4.420.2870)

Retaining nut (4.420.2850)

Glass capillary (6.1226.030 or

6.1226.050)

Screw connection

electrical contact for "WE" electrode cable

2 Installation

2.3.2 Filling the MME with mercury

When handling mercury, it is necessary to take special precautionary measures. These are described in detail in section

All actions involving the electrode and mercury vessels must be performed in or over the drip pan

91 supplied (see Fig. 9 - Fig. 11).

The Hg reservoir

81 of the Multi-Mode Electrode 21 is filled with mercury of the hig-

hest degree of purity (mass fraction w ≥ 0.99999) as follows:

1 Prepare Multi-Mode Electrode

• Unscrew locking ring 73 from slotted screw 74 (this gray PVC ring is nee- ded only to remove the slotted screws

2.3.9).

tion

• Turn slotted screw

74 in or out of the screw thread 76 using a suitable

74 or 79, see section 2.3.7 and sec-

coin until the contact surface of the black O-ring at the Plexiglas wall (thin, black stripe) is just visible below the metal thread

• Remove the plastic cap used as a transport safeguard from the retaining

86.

nut

• Undo retaining nut

• Place Multi-Mode Electrode

in the electrode holder

86 fully and remove from screw thread 82.

21 with the capillary opening facing upwards

92 (see Fig. 9).

3.4.

76.

Fig. 9: Adding the mercury

Multi-Mode Electrode (6.1246.0020)

Syringe (6.2816.020)

Needle (6.2816.030)

Drip pan (6.2711.030)

Electrode holder (6.2615.030)

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.3 Multi-Mode Electrode (MME)

2 Draw up mercury

• Attach needle 90 to syringe 89.

• Draw up 6 mL ultra pure mercury slowly and carefully using syringe

3 Add mercury to MME

• Lower syringe needle 90 into the top opening of the MME 21 between sealing ring

• Expel mercury slowly and carefully from the syringe to allow it to flow into the Hg reservoir

The Hg reservoir ry.

84 and sealing needle 75.

81.

81 must never be filled more than 2/3 full with mercu-

2.3.3 Mounting the capillary

The glass capillaries 87 for the Multi-Mode Electrode 21 are supplied separately in a protective plastic package. After they have been unpacked, avoid any contact whatsoever with the sensitive capillary tip. The capillary is mounted in the MME filled with mercury (as described in section

2.3.2) as follows:

1 Insert retaining nut

• Screw retaining nut 86 into screw thread 82 until a slight resistance is noti- ceable (on no account screw in retaining nut fully!).

2 Insert capillary

• Cut open plastic package containing the glass capillary 87 on the side of the large capillary opening using scissors (do not tear open), leave capillary in the package.

• Insert glass capillary directly from its protective plastic package through the retaining nut

3 Tighten retaining nut

• Firmly tighten retaining nut 86 by hand (do not use a tool). The glass capillary should then be centered in the opening of the retaining nut.

• If this is not the case, undo retaining nut by one full turn and then retighten by hand. When tightening, move glass capillary in a circle so that it is centered in the feed-through of the retaining nut.

86 into the sealing ring 84 and push in as far as it will go.

2.3.4 Filling capillary without vacuum

The glass capillary 87 can normally be filled with mercury by the method described here without vacuum. However, if difficulties regarding stability or reproducibility arise with a capillary filled in this manner, try to fill the capillaries by the alternative method with vacuum (section without vacuum, proceed as follows:

2.3.5). To fill the mounted glass capillary (section 2.3.3) with Hg

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

1 Install Multi-Mode Electrode in 797 VA Computrace Stand

• With the measuring head arm 23 tilted back, slide the empty measuring 7 into the holder 5 of the 797 VA Computrace Stand and then lower

vessel the measuring head arm.

• Carefully insert Multi-Mode Electrode

24 (during insertion, the tip of the capillary 87 must not touch the

head

21 in opening 58 of the measuring

measuring head) and push in carefully as far as it will go. Avoid water drops touch the tip of the capillary.

2 Connect Multi-Mode Electrode

• Screw FEP tubing 34 for the inert gas supply into connection 71 of the

Multi-Mode Electrode

• Screw FEP tubing

21.

42 for the inert gas supply into connection 72 of the

Multi-Mode Electrode.

• Attach electrode cable

20 (WE) to screw connection 88 of the Multi-Mode

Electrode: push cable lug under the screw and then tighten screw firmly.

3 Fill capillary with mercury

• Switch on 797 VA Computrace Stand with mains switch 14 (the 797 VA

Computrace Stand must first be installed properly as described in section

2.2).

• Start the VA Computrace program and click on

/ Computrace control

to open the COMPUTRACE CONTROL window. Then switch

or MAIN WINDOW / Utility

on the inert gas supply to the 797 VA Computrace Stand by clicking on This pressurizes the Multi-Mode Electrode 21 and the mercury begins to flow slowly out of the capillary.

• Gently tap the MME with your finger (to remove any air bubbles) and allow

the mercury to flow out of the capillary into the empty measuring vessel for approx. 2 min.

• Fill measuring vessel

7 with 10 mL ultra pure water and add 1 drop KCl solution (in pure water, mercury drops from the capillary only with difficulty).

• Allow mercury to flow out of the capillary for ca. 2 min while checking the drop formation: The drop time should be ca. 3 s.

4 Adjusting the sealing needle 75

• Turn slotted screw 74 using a suitable coin slowly in a clockwise direction until the mercury flow stops.

• Open slotted screw slightly in an anticlockwise direction until the mercury flow restarts.

• Gently tap the MME with your finger and turn the slotted screw very slowly clockwise until the mercury flow just stops. (The tapping action is used to knock off the mercury drops so that it is easier to see whether mercury continues to flow).

• Finally, turn slotted screw a quarter of a turn clockwise.

DME.

5 Checking the MME for leaks

• Switch on the dropping mercury electrode by selecting DME in the COM-

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.3 Multi-Mode Electrode (MME)

PUTRACE CONTROL window and clicking on . The mercury drops

freely out of the capillary.

• Select

HMDE and click on . A single mercury drop is formed.

Knock this off by gently tapping the MME that the mercury flow has really stopped. Repeat this operation several times.

• If mercury continues to flow, turn slotted screw wise direction and repeat check.

• If it is not possible to stop the mercury flow, both the glass capillary the sealing needle 75 have to be replaced (see section 2.3.9).

2.3.5 Filling the capillary using vacuum

Filling of the glass capillary 87 with vacuum is advisable in all cases where difficulties have been found with the method without vacuum described in section with vacuum is especially recommended when no ultra pure Hg is available.

To fill the mounted glass capillary (section follows:

1 Set up filling station

• All actions involving the electrode and the mercury vessels must be performed in or over the drip pan

• The MME

21 is placed in the electrode holder 92 for filling.

91 supplied (see Fig. 10).

21 with your finger and check

74 still further in a clock-

87 and

2.3.4 Filling

2.3.3) with Hg with vacuum, proceed as

2 Connection for vacuum pump

• For filling the capillary 87, the filling tubing 93 is required. At one end it is fitted with a filling cone end with the tubing coupling

94 for mounting on the capillary, and at the other

96 for attachment to the line for the vacuum

pump.

• To avoid possible mercury losses, two gas wash bottles

95 are attached to

the filling tubing

3 Vacuum pump

• To draw up mercury a suitable vacuum pump is required (e.g. water jet

pump). The partial vacuum

p should be around 25 mbar.

• A vacuum release tap must be installed at the vacuum pump or in the line between the gas wash bottle and the pump for slowly releasing the vacuum.

4 Mount filling tubing

• Mount filling tubing 93 with filling cone 94 on glass capillary 87.

• Connect filling tubing with tubing coupling

96 to the two gas wash bottles

95 and the vacuum pump (see Fig. 10).

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

Fig. 10: Setting up the filling station

Pump

acuum release

tap

Vacuum

91 92 21

Fig. 11: Filling the capillary

Multi-Mode Electrode (6.1246.0020)

Glass capillary (6.1226.030)

Drip pan (6.2711.030)

Vacuum

1 2

Electrode holder (6.2615.030)

Filling tubing (6.1817.000)

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.3 Multi-Mode Electrode (MME)

Filling cone (4.420.2860)

(part of the filling tubing

Gas wash bottle

5 Evacuating in vertical position

• Place Multi-Mode Electrode 21 vertically in the electrode holder 92 (see

• Evacuate for ca. 2 min in this position.

6 Evacuating in inclined position

• Carefully tilt Multi-Mode Electrode 21 in the electrode holder 92 to an in-

7 Release vacuum

• As soon as mercury issues from the tip of the glass capillary 87 into the

Tubing coupling (6.1809.000)

93)

(part of the filling tubing

Fig. 11-1).

clined position and continue evacuating (see

filling tubing

93, carefully release the vacuum by opening the vacuum re-

lease tap.

93)

Fig. 11-2).

The filling tubing

87 when under vacuum, otherwise the mercury which has issued

ry from the capillary would be sprayed onto the tubing wall and can no

93 must not be disconnected from the glass capilla-

longer be disposed of in drop form!

• Tap the glass capillary tip are knocked into the filling tubing

• Disconnect filling tubing

• Place Multi-Mode Electrode

holder

92 (see Fig. 11-3).

87 gently by hand so that any mercury drops at its

93.

94 with filling cone from glass capillary.

21 in a horizontal position in the electrode

From now on, the MME must be left in this position until it is installed in the stand!

8 Install Multi-Mode Electrode in 797 VA Computrace Stand

• With measuring head arm 23 tilted back, push empty measuring vessel 7 into the holder ing head arm

• Carefully insert Multi-Mode Electrode

24 (during insertion, the tip of the capillary 87 must not touch the

head

5 of the 797 VA Computrace Stand and then lower measur-

23. 21 in opening 58 of the measuring

measuring head) and push in as far as it will go.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

9 Connect Multi-Mode Electrode

• Screw FEP tubing 34 for the inert gas supply into connection 71 of the Multi-Mode Electrode

• Screw FEP tubing

21.

42 for the inert gas supply into connection 72 of the

Multi-Mode Electrode.

• Attach electrode cable

20 (WE) to screw connection 88 of the Multi-Mode

Electrode push cable lug under the screw and then tighten screw firmly.

10 Pressurize the MME

• Switch on 797 VA Computrace Stand with mains switch 14 (the 797 VA Computrace Stand must first be installed properly as described in section

2.2).

• Start the VA Computrace program and click on

/ Computrace control

to open the COMPUTRACE CONTROL window. Then switch

or MAIN WINDOW / Utility

on the inert gas supply to the 797 VA Computrace Stand by clicking on

DME. This pressurizes the Multi-Mode Electrode 21 and the mercury begins

to flow slowly out of the capillary.

• Gently tap the MME with your finger (to remove any air bubbles) and allow mercury to flow out of the capillary into the empty measuring vessel for approx. 2 min.

• Fill measuring vessel

7 with 10 mL ultra pure water and add 1 drop KCl solution (in pure water, mercury drops from the capillary only with difficulty).

• Allow mercury to flow out of the capillary for ca. 2 min while checking the drop formation: The drop time should be ca. 3 s.

11 Adjusting the sealing needle 75

• Turn slotted screw 74 using a suitable coin slowly in a clockwise direction until the mercury flow stops.

• Open slotted screw slightly in an anticlockwise direction until the mercury flow restarts.

• Gently tap the MME with your finger and turn the slotted screw very slowly clockwise until the mercury flow just stops. (The tapping action is used to knock off the mercury drop so that it is easier to see whether mercury continues to flow).

• Finally, turn slotted screw a quarter of a turn clockwise.

12 Checking the MME for leaks

• Switch on the dropping mercury electrode by selecting DME in the COM-

PUTRACE CONTROL

window and clicking on . The mercury drops

freely out of the capillary.

• Select

HMDE and click on . A single mercury drop is formed.

Knock this off by gently tapping the MME

21 with your finger and check that the mercury flow has really stopped. Repeat this operation several times.

• If mercury continues to flow, turn slotted screw

74 still further in a clock-

wise direction and repeat check.

• If it is not possible to stop the mercury flow, both the glass capillary

87 and

the sealing needle 75 have to be replaced (see section 2.3.9).

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.3 Multi-Mode Electrode (MME)

2.3.6 Storing the MME

On completion of the measurements, the MME is stored in the 797 VA Computrace Stand so that the tip of the glass capillary vent used). This prevents blockage of the capillary by crystallized salts.

An electrode treated in this manner can be taken out of the 797 VA Computrace Stand after a few hours and stored in air for a lengthy period without suffering any damage. Always store the MME so that the glass capillary is horizontal (see

87 is immersed in pure water (or in the sol-

Fig. 11-3).

2.3.7 Replenishing the mercury (without changing capillary)

The Multi-Mode Electrode 21 can also be refilled with mercury without having to remove the glass capillary

1 Dismantle Multi-Mode Electrode

• Unscrew FEP tubing 34 and 42 from the MME. Disconnect electrode cable 20 from the MME.

• Take Multi-Mode Electrode MME gently to knock off any mercury drops on the glass capillary into the measuring vessel.

• Place Multi-Mode Electrode horizontally in the electrode holder

11-3). The slotted screw 79 is now at the top.

87.

21 out of the measuring head 24 and tap the

92 (see Fig.

2 Replenish mercury

• Unscrew slotted screw 79 using a suitable coin. If the slotted screw can not be loosened by hand, screw on locking ring 73 and pull out of the MME.

• Draw up mercury using the syringe into the Hg reservoir

• Reinsert slotted screw into screw thread

The Hg reservoir must never be filled more than

using a suitable coin (this action may expel a few drops of mercury from glass capillary).

Do not turn so tightly that the cemented-in steel threaded ring comes loose and hence jeopardizes the tightness and safety of the MME!

2.3.8 Changing capillary

The capillary has a limited life time due to mechanical wearout of and chemical contamination of the capillary tip. This results in irreproducible drop fall in DME mode, fall-off of the drop in stripping voltammetry using HMDE or increased noise or high background currents. If the MME is stored for a longer period of time, it is possible that the capillary is blocked by mercury salts. In such cases, exchange the capillary.

81.

89 with attached needle 90 and expel

/3 full with mercury.

78 and screw flush to surface

78 be-

We also recommend exchanging the sealing needle regularly. After a longer period of use the surface can be covered with mercury oxides and/or glass particles from the capillary. Both produce high noise during the measurement. Damaged sealing needles

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

can also lead to leakage of the MME, i.e. the mercury flow cannot be stopped any more.

Proceed as follows:

1 Remove Multi-Mode Electrode from 797 VA Computrace Stand

• Unscrew FEP tubing 34 and 42 from the MME, disconnect electrode cable 20 from MME.

• Take Multi-Mode Electrode

21 out of measuring head 24 while gently tapping the MME to knock off any mercury drops on the glass capillary into the measuring vessel.

• Place Multi-Mode Electrode in a horizontal position in the electrode holder

92 (see Fig. 11-3).

2 Unscrew slotted screw 74

• Using a suitable coin, unscrew slotted screw 74 out of screw thread 76 un- til the contact surface of the black O-ring at the Plexiglas wall (thin, black stripe) is just visible below the metal thread.

3 Replace sealing needle 75

If problems with leaks arise owing to a worn, deformed or damaged sealing needle, it must be replaced. Three spare needles are supplied separately in a protective plastic package. After unpacking a needle, please avoid any contact whatsoever with the needle tip. The spare needle

75 is installed as follows:

• Carefully pull old sealing needle out of PTFE membrane of the slotted screw

74.

• Carefully insert new sealing needle without tilting into the hole in the PTFE membrane of the slotted screw.

NOTE: Do not touch the needle with bare fingers but use the plastic package

4 Dismantle old capillary

• Position Multi-Mode Electrode vertically in the electrode holder (see Fig. 11-

1).

• Undo retaining nut the lower part of the glass capillary

86 completely by turning anticlockwise and lift up until

87 with the wide opening is visible.

• Gently tap the glass capillary to knock off any residual mercury in the wide opening into the MME.

• Press the retaining nut downward with one hand and with your other hand take glass capillary completely out of the mount.

5 Dispose of old capillary

• Connect filling tubing 93 with the tubing coupling 96 to the two gas wash bottles

• Insert glass capillary

95 and the vacuum pump (see Fig. 10).

87 (capillary end) in the filling cone 94 of the filling

tubing.

• Remove mercury from capillary with the vacuum pump.

6 Replenish mercury if necessary

Proceed as described in section 2.3.2.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.3 Multi-Mode Electrode (MME)

7 Mount new capillary

Proceed as described in section 2.3.3.

8 Fill capillary

Proceed as described in section 2.3.4 or section 2.3.5.

2.3.9 Cleaning the MME

If the mercury in the Multi-Mode Electrode is contaminated and this leads to disturbances, the MME must be cleaned and refilled with ultra pure mercury. Proceed as follows:

1 Remove Multi-Mode Electrode from 797 VA Computrace Stand

• Unscrew FEP tubing 34 and 42 from the MME, disconnect electrode cable 20 from MME.

• Take Multi-Mode Electrode ping the MME to knock off any mercury drops on the glass capillary into the measuring vessel.

21 out of measuring head 24 while gently tap-

2 Remove old mercury

• Place Multi-Mode Electrode 21 in a horizontal position in the electrode hol-

92 (see Fig. 11-3). The slotted screw 79 is now at the top.

der

• Unscrew slotted screw using a suitable coin.

• Carefully turn MME and empty mercury through the threaded opening

into a waste container placed in the drip pan tap the glass capillary of the MME.

3 Dismantle MME

• Unscrew retaining nut 86.

• Take glass capillary

locking ring from the glass capillary.

• Remove insert ring

• Unscrew slotted screw

from screw thread

• Screw locking ring

4 Dispose of old capillary

• Connect filling tubing 93 with the tubing coupling 96 to the two gas wash bottles

• Insert glass capillary tubing.

• Remove mercury from the capillary with the vacuum pump.

85 are removed at the same time. Remove these two parts

95 and the vacuum pump (see Fig. 10).

87 and the MME to ensure that all mercury flows out

87 out of opening 82, the sealing ring 84 and the

83 from the MME.

74 with a suitable coin in an anticlockwise direction

76. 73 onto slotted screw and pull out of the MME.

87 (capillary end) in the filling cone 94 of the filling

91. While doing so, gently

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

5 Clean MME

• Clean inner compartments of the MME, contact pin 80 and the screw threads

76, 78 and 82 with a lint-free cloth.

• If required, rinse all inner compartments of the MME and the unscrewed individual parts with dist. water and then dry with N

Do not use any organic solvents.

If you used water to clean the MME, make sure that the inside of the electrode has dried entirely. Residual moistness can cause problems during subsequent measurements.

6 Replace sealing needle 75 if needed

If problems with leaks arise owing to a worn, deformed or damaged sealing needle this must be replaced. Three spare needles are supplied separately in a protective plastic package. After unpacking a needle, please avoid any contact whatsoever with the needle tip. The spare needle

75 is installed as follows:

• Carefully pull old sealing needle out of PTFE membrane of the slotted screw

74.

• Carefully insert new sealing needle without tilting into the hole in the PTFE membrane of the slotted screw.

When the sealing needle change the glass capillary

75 is changed, it is always necessary to

87!

7 Replace sealing ring 84 if needed

• If the sealing ring 84 is contaminated or damaged in any way, it must be replaced for the subsequent assembly of the MME. Two new sealing rings are enclosed in the package with the 6.1226.030 (normal) resp. 6.1226.050 (silanised) glass capillaries.

8 Reassemble MME

• Screw slotted screw 79 using a suitable coin flush into screw thread 78.

Do not turn so tightly that the cemented-in steel threaded ring becomes loose and hence jeopardizes the tightness and safety of the

MME!

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.3 Multi-Mode Electrode (MME)

• Using a suitable coin, screw slotted screw 74 into the screw thread 80 until the contact surface of the black O-ring at the Plexiglas wall (thin, black stripe) is just visible below the metal thread.

• Place Multi-Mode Electrode electrode holder

• Insert ring

• Push sealing ring

92 (see Fig. 11-1).

83 in opening 86.

84 onto locking ring 85 and insert both in the opening

21 with the opening 82 facing upwards in the

82.

• Screw retaining nut

86 by hand into screw thread 82 until a slight resis-

tance is felt.

9 Add mercury

Proceed as described in section 2.3.2.

10 Mount new capillary

Proceed as described in section 2.3.3.

11 Fill capillary

Proceed as described in section 2.3.4 or section 2.3.5.

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2 Installation

2.4 Rotating disk electrode (RDE)

The rotating disk electrode (RDE) can be used in place of the MME in the 797 VA Computrace Stand with different electrode tips as a working electrode. Version

2.797.0030 is delivered solely with a rotating plating electrode. For operation of the rotating disk electrode (RDE) the following accessories are required (see also section

4.3):

• 6.1204.210 Driving axle for rotating disk electrode (RDE) with titanium axle

• 6.1204.220 Driving axle for rotating disk electrode (RDE) with titanium axle and mercury contact

• 6.1204.XXX Electrode tip for rotating electrode

6.1204.110 GC (Glassy Carbon)

6.1204.120 Pt unpolished, 2 mm disk diameter

6.1204.130 Ag

6.1204.140 Au for Hg determination

6.1204.150 Au for As determination

6.1204.160 Pt polished, 2 mm disk diameter for CVS

6.1204.170 Pt polished, 3 mm disk diameter for CVS

6.1204.180 Ultra Trace Graphite

6.1204.190 Pt polished, 1 mm disk diameter for CVS

• 6.2709.040 Stopper for closing the MME opening

• 6.2802.000 Polishing kit for 6.1204.XXX Electrode tips

(Pt, Ag, Au, GC)

• 6.2827.000 Trimming tool for 6.1204.180 Electrode tip (Ultra Trace Graphite)

It is recommended to use RDE tips (except Pt) only together with a glassy carbon auxiliary electrode!

2.4.1 Construction and startup of the RDE

The rotating disk electrode RDE comprises the two parts drive shaft 99 (6.1204.210) and electrode tip

The procedure for installing the RDE in the measuring head arm of the 797 VA Computrace Stand is described in detail in section head arm with the RDE is illustrated in

98 (6.1204.2x0), which must be screwed together.

Fig. 12.

2.4.2 Regeneration of RDE

The RDE is a solid electrode with a stationary surface. This becomes contaminated with the products of the electrode redox processes with increasing use For regeneration please observe the information on the leaflet enclosed with the RDE.

2.2.4. The fully equipped measuring

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.4 Rotating disk electrode (RDE)

38 39 40 41 20 34 97

35 32 99 98 43

Fig. 12: Measuring head arm with rotating disk electrode (RDE)

Stopper (6.2709.080) to close the pipetting opening

Electrode cable ”WE” connection for working electrode (RDE)

Measuring head arm carrier plate with permanently attached measuring head, raisable

Measuring head measuring vessel upper half made of PTFE; with openings for electrodes, stirrer, gas and liquid supply lines

Drive belt (6.1244.020) connection between drive wheel and drive shaft

FEP tubing (6.1805.180)

Drive wheel of drive motor

35 und

FEP tubing (6.1805.180) for inert gas supply to tapping mechanism (attached)

Electrode cable ”AE” connection for auxiliary electrode

FEP tubing (6.1805.180)

Auxiliary electrode

details, see section

Stopper (6.2709.040)

2.6

for closing the MME opening and to accommodate the two lengths of FEP tubing

Electrode tip (6.1204.XXX) for RDE

Drive shaft (6.1204.210) for RDE

34 and 42

FEP tubing (6.1805.090) for inert gas lead-off

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

2.5 Reference electrode

2.5.1 Construction

The complete reference electrode (RE) 26 comprises two parts:

• 6.0728.0X0 Ag/AgCl-reference system (

with ceramic diaphragm type D, diameter = 1 mm

6.0728.030 Reference system: LL-Ag/AgCl/c(KCl) =3 mol/L;

6.0728.020 Reference system: Ag/AgCl/c(KCl) = 3 mol/L; supplied in a holder filled with c(KCl) = 3 mol/L as standard

6.0728.010 Reference system: Ag/AgCl supplied dry (option)

• 6.1245.010 Electrolyte vessel (

with ceramic diaphragm type D, diameter=3 mm; holds a second electrolyte solution (bridge electrolyte) and thus forms with the 6.0728.020 Reference system a complete reference electrode in the so-called double junction construction.

The construction of the reference electrode and the designations of the individual parts are shown in

10026

Fig. 13.

102

103

104

105

101)

26 Reference electrode

100

101

102

100)

Reference system (6.0728.0X0)

Electrolyte vessel (6.1245.010)

Electrical connection for cable "RE"

106

107

108

109

101

110

Fig. 13: Construction of the reference

electrode

797 VA Computrace / Hardware-Manual 8.797.8001EN

Vent opening

103

Ag/AgCl filling

104

Electrolyte compartment with

105

internal electrolyte

Diaphragm support made of

106

PCTFE

Diaphragm

107

Vent opening

108

Electrolyte compartment with

109

bridge electrolyte

Diaphragm

110

2.5 Reference electrode

2.5.2 Startup procedure

The reference electrode 26 is supplied in modular form as the reference system 100 and the electrolyte vessel

1 Add internal electrolyte

Filling of the reference system is necessary only when the optional 6.0728.010 Reference system supplied dry is used, if the internal electrolyte solution has to be renewed / filled up or if gas bubbles interrupt the electrical connection.

• Hold reference system

• Unscrew diaphragm support

• Fill electrolyte compartment

electrolyte. Expel any air bubbles by tapping shaft gently.

• Screw diaphragm support placed is expelled through the vent opening

2 Add bridge electrolyte

• Fill internal compartment 109 of the electrolyte vessel 101 with a suitable bridge electrolyte whose composition depends on the analyses to be performed (aqueous or non-aqueous solution, composition of the supporting electrolyte, etc.).

• For the determination of organic additives in electroplating bath solutions with CVS and CPVS use electrolyte c(KNO3) = 1 mol/L (Metrohm order no.

6.2310.010).

If you use the same solution for the bridge electrolyte and the internal electrolyte (single-junction operation), the inner diaphragm be omitted to reduce the electrical resistance: Unscrew diaphragm support

101 and has first to be filled and assembled as follows:

100 so that diaphragm 107 faces upwards.

106.

105 completely with the desired internal

106 back on, the electrolyte solution thus dis-

103.

107 can

106 with diaphragm 107 from the reference system 100.

3 Screw reference electrode together

• Insert the filled reference system 100 in the vessel 101 filled with bridge electrolyte and screw tight. The electrolyte solution thus displaced is expelled through the vent opening until the diaphragm is soaked with bridge electrolyte (ca. 20 min).

4 Install reference electrode in 797 VA Computrace Stand and

connect

• Insert reference electrode

Fig. 6).

• Attach electrode cable push cable lug under the screw and then tighten screw firmly.

• Turn reference electrode so that the electrode cable points to the rear and not to the side (in the latter position it may become kinked and damaged when cover

2 is closed).

26 in opening 61 of the measuring head 24 (see

31 (RE) to reference electrode:

108. Metrohm recommends waiting now

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

2.6 Auxiliary electrode

2.6.1 Construction

The following electrodes can be used as the auxiliary electrode 43:

• 6.0343.000 Pt auxiliary electrode supplied as standard

• 6.1241.020 Electrode holder and

6.1247.000 Glassy carbon tip

together form the glassy carbon auxiliary electrode available as an option

The construction of the two auxiliary electrodes and the designations of the individual parts are shown in

2.6.2 Startup procedure

Fig. 14.

The 6.0343.000 Pt auxiliary electrode supplied as standard can be inserted directly in the 797 VA Computrace Stand (→ 2), whereas the GC auxiliary electrode available as an option must first be assembled (→ 1):

1 Assembly of the GC auxiliary electrode

• Insert glassy carbon tip 116 through the locking ring 115 into the elec- trode holder

2 Install auxiliary electrode in 797 VA Computrace Stand and connect

• Insert auxiliary electrode 43 in opening 54 of the measuring head 24 (see

• Attach electrode cable

• Turn auxiliary electrode 39 so that the electrode cable 37 points to the

Glassy carbon is a brittle, easily breakable material and must therefore be inserted carefully into the electrode holder and handled gently.

If the GC tip breaks, the part remaining in the holder can be removed by pulling out the locking ring

Fig. 6).

Push cable plug under the screw and tighten screw firmly.

rear and not to the side (in the latter position it may become kinked and damaged when cover

114 as far as it will go.

115.

41 (AE) to auxiliary electrode 39:

2 is closed).

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.7 Stirrer

43 Auxiliary electrode

Electrical connection for

111

112

111

114

111

cable "AE"

Pt Auxiliary electrode

112

(6.0343.000)

Pt tip

113

(permanently attached)

115

116

113

Fig. 14: Construction of the auxiliary electrode

2.7 Stirrer

The startup procedure for the stirrer is as follows:

1 Insert stirrer

• Insert complete stirrer in opening 63 of the measuring head 24 as far as it will go (see

Fig. 6).

Electrode holder

114

(6.1241.020)

Locking ring

115

Glassy carbon tip

116

(6.1247.000)

2 Connect stirrer

• Stretch drive belt 32 between drive wheel 35 and drive shaft of the stirrer 28 (see Fig. 3).

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

2.8 Connection of Dosing devices

For the automatic addition of standard and auxiliary solutions, up to three Dosing devices (possible: 700/800 Dosino or 685/805 Dosimat) can be attached via the MSB sockets MSB1 - MSB3 (

For the connection of four additional Dosing devices, a 846 Dosing Interface can be used (from software version 1.2). The 846 Dosing Interface (ordering details see Section Connection the PC. For the controlling of the Dosing devices, see the Software Manual 8.797.8033.

Following Dosing devices can be operated with the 797 Computrace:

800 Dosino with Dosing unit 807

700 Dosino with Dosing unit 807

805 Dosimat with Exchange unit 806

12) to the 797 VA Computrace Stand.

4.3.1) can be connected to a USB

19 of the 797 VA Computrace or to a USB Connection of

685 Dosimat with Exchange unit 806

(for the connection, cable 6.2134.030 is needed)

Dosing- and Exchange Units have burette volumes from 1 mL – 50 mL. The choice between Exchange unit and Dosing unit depends on the volume of liquid the Dosimat/Dosino should dispense. A burette volume of 5 mL (Exchange unit) or 2 mL (Dosing unit) is recommended for additions in the μL range (standard additions solutions), a burette volume of 10 mL or higher is recommended for additions in the mL range (auxiliary solutions).

Ordering descriptions of all Dosing devices, Dosing- and Exchange units and cables can be found in section

This section describes the connection procedure; further details on Dosing devices and the different Dosing- and Exchange units can be found in the respective Instructions

for Use.

4.3.

2.8.1 Electrical connection

Connect all Dosing devices to an MSB-connection 12 of the 797 VA Computrace Stand and switch the 797 VA Computrace Stand on at the main switch Connections can be extended with the cable 6.2151.010. The connection must not be longer than 15 m.

14. MSB-

For hardware-settings of the Dosing units see 797 Software Manual and the respective Instructions for Use.

2.8.2 Tubing connection

For the addition of volumes < 2 mL of standard or auxiliary solutions into the measuring vessel of the 797 VA Computrace Stand, the 4-way microtip be used. It is fitted with 4 lengths of PTFE tubing with connection nipples for direct attachment to the Dosinos or Dosimats. To ready the Dosing devices for automatic dispensing, proceed as follows:

797 VA Computrace / Hardware-Manual 8.797.8001EN

30 (6.1824.000) can

2.8 Connection of Dosing devices

700 Dosino and 800 Dosino

1 Mount Dosing unit on Dosino

• Procedure, see Instructions for Use 700, section 2.2, and Instructions for Use 800, section 3.1 respectively.

2 Insert 4-way microtip in 797 VA Computrace Stand (see section 2.2.4)

• Remove stopper from nipple 27 and insert 4-way microtip 30 into nipple as far as it will go (see Fig. 3 and Fig. 6).

• Tighten nipple manually, so that the 4-way microtip can no longer move.

• Pull the 4 lengths of PTFE tubing of the 4-way microtip 26 in succession

from above through the opening

64.

3 Connect PTFE-Tubing to Dosing unit

• Screw connection nipple of the PTFE tubing of the 4-way microtip

30 on 1 (Port 1) of the Dosing unit

807.

4 Close unused PTFE tubing

• Screw a 6.1808.000 Coupling (accessory of 797 VA Computrace Stand) on each unused PTFE tubing of the 4-way microtip

30.

• Screw a 6.1446.040 Dummy stopper (accessory of 797 VA Computrace Stand) on each 6.1808.000 Coupling.

5 Initialize Dosino(s)

• Switch on the 797 VA Computrace Stand using the mains switch 14.

• Switch on the PC and start the 797 VA Computrace program.

• Open the

ce: the

Dosinos tab (if the Dosino is connected to the 846 Dosing Interfa-

Dosing Interface tab) of the window General settings and enter the

following configuration:

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

• Note: The maximum allowed dose rate is 2 mL/min if the 4-way microtip is used to dose the solution in the measuring vessel.

• Click <OK>.

• Click on

CONTROL

or MAIN WINDOW / Utility / Dosino control to open the DOSINO

window.

• The connected Dosino and the mounted Dosing unit are automatically identified.

• Click the

button to empty and refill the Dosing unit installed on

the Dosino.

• Check if there are air bubbles left in the glass cylinder of the Dosing unit. If

this is the case, repeat the flushing procedure by clicking the button.

• Close the

DOSINO CONTROL window.

• Note: If you choose Port 3 for menu item install an FEP Tubing Connection 6.1805.XXX from Port 3 to a waste container.

685 Dosimat and 805 Dosimat

Prep / Empty via port, you must

1 Mount Exchange unit on Dosimat

• Procedure, see Instructions for Use 685, section 2.1; and Instructions for Use 805, section 3.1 respectively.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.8 Connection of Dosing devices

2 Insert 4-way microtip in 797 VA Computrace Stand (see section 2.2.4)

• Remove stopper from nipple 27 and insert 4-way microtip 30 into nipple as far as it will go (see Fig. 3 and Fig. 6).

• Tighten nipple manually, so that the 4-way microtip can no longer move.

• Pull the 4 lengths of PTFE tubing of the 4-way microtip 26 in succession

from above through the opening

64.

3 Connect PTFE tubing to Exchange unit

• Unscrew the attached 6.1805.020 FEP Tubing (L = 40 cm)

from connection 2 (connection for burette tip) of the flat stopcock on the Exchange unit mounted on the Dosimat.

• Screw connection nipple of the PTFE tubing of the 4-way microtip

30 onto connection 2 of the flat stopcock

on the Exchange unit mounted on the Dosimat.

4 Close unused PTFE tubing

• Screw a 6.1808.000 Coupling (accessory of 797 VA Computrace Stand) on each unused PTFE tubing of the 4-way microtip

30.

• Screw a 6.1446.040 Dummy stopper (accessory of 797 VA Computrace Stand) on each 6.1808.000 Coupling.

5 Initialize Dosimat(s)

• Switch on the 797 VA Computrace Stand using the mains switch 14.

• Switch on the PC and start the 797 VA Computrace program.

• Open the

ce: the

Dosinos tab (if the Dosino is connected to the 846 Dosing Interfa-

Dosing Interface tab) of the window General settings and enter the

following configuration:

• Note: The maximum allowed dose rate is 2 mL/min if the 4-way microtip is

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

used to dose the solution in the measuring vessel.

• Click <OK>.

• Click on

CONTROL

or MAIN WINDOW / Utility / Dosino control to open the DOSINO

window.

• The connected Dosimat and the mounted Exchange Unit are automatically identified.

• Click the

button to empty and refill the Exchange unit installed

on the Dosimat.

• Check if there are air bubbles left in the glass cylinder of the Exchange unit.

If this is the case, repeat the flushing procedure by clicking the button.

• Close the

DOSINO CONTROL window.

2.8.3 Change Dosing-/Exchange unit

Dosing unit 807

The Dosing unit mounted on the Dosino can be changed only in the exchange position which is reached after filling. Please proceed as follows:

1 Fill Dosing unit

At the start of the VA Computrace program, the Dosing unit is automatically filled. So this step is only necessary if the Dosino has already been used during the running program session.

• Click on

CONTROL

• Click the

or MAIN WINDOW / Utility / Dosino control to open the DOSINO

window.

button of the corresponding Dosino to fill the Dosing

unit installed on the Dosino.

2 Change Dosing unit

• Unscrew connection nipple of the PTFE tubing of the 4-way microtip 30 from connection 1 and take off old Dosing unit.

• Mount new Dosing unit on Dosino, the new Dosing unit is automatically identified.

• Screw connection nipple of the PTFE tubing of the 4-way microtip (Port 1) of the Dosing unit.

3 Initialize Dosino(s)

• Click on or MAIN WINDOW / Utility / Dosino control to open the DOSINO

CONTROL

• Click the

window.

button of the corresponding Dosino to empty and re-

fill the Dosing unit installed on the Dosino.

• Check if there are air bubbles left in the glass cylinder of the Dosing unit. If

this is the case, repeat the flushing procedure by clicking the button.

• Close the

DOSINO CONTROL window.

30 on 1

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.8 Connection of Dosing devices

Exchange unit 806

The Exchange unit 806 mounted on the Dosimat can be changed only in the exchange position which is reached after filling. Please proceed as follows:

1 Fill Exchange unit

At the start of the VA Computrace program, the exchange unit is automatically filled. So this step is only necessary if the Dosimat has already been used during the running program session.

• Click on

CONTROL

or MAIN WINDOW / Utility / Dosino control to open the DOSINO

window.

• Click the change unit installed on the Dosimat.

2 Change Exchange unit

• Unscrew connection nipple of the PTFE tubing of the 4-way microtip 30 from connection 2 and take off old Exchange unit.

• Mount new Exchange unit on Dosimat, the new Exchange unit is automatically identified.

• Screw connection nipple of the PTFE tubing of the 4-way microtip connection 2 of the flat stopcock on the Exchange unit.

3 Initialize Dosimat(s)

• Click on or MAIN WINDOW / Utility / Dosino control to open the DOSINO

CONTROL

window.

• Click the refill the Exchange unit installed on the Dosimat.

• Check if there are air bubbles left in the glass cylinder of the Exchange unit.

If this is the case, repeat the flushing procedure by clicking the button.

• Close the

DOSINO CONTROL window.

button of the corresponding Dosimat to fill the Ex-

30 onto

button of the corresponding Dosimat to empty and

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

2.9 Connection of 863 Compact Autosampler

With the 863 Compact Autosampler connected to the 797 VA Computrace Stand, max. 18 samples can be transferred to the measuring vessel at the 797 VA Computrace Stand. It can only be used for the automated voltammetric trace analysis. After each measurement, the measuring vessel is rinsed by means of a 843 Pump Station. For operation of this sample changer and the automatic addition of addition solutions and auxiliary solutions by means of Dosing devices, the following instruments and accessory parts are needed (see also section

4.3):

Quant.

1 2.863.0020 863 Compact Autosampler for VA-Applications

1 2.843.0140 843 Pump Station Membrane Version for VA-

1 2

For automatically addition of addition- and auxiliary solutions up to three Dosing devices can be used (four additional with a 846 Dosing Interface, see also section Following instruments/accessories are needed per Dosing device (see also section

Quant.

1 2.800.0010 800 Dosino

1 6.3032.120 Dosing unit 2 mL (for addition solutions)

1 6.3032.210 Dosing unit 10 mL (for auxiliary solutions)

1 2.700.0010 700 Dosino

1 6.3032.120 Dosing unit 2 mL (for addition solutions)

1 6.3032.210 Dosing unit 10 mL (for auxiliary solutions)

Order no. Instrument/Accessory

Applications

2.731.0010

2.772.0110

Order no. Instrument/Accessory

731 Relay Box with 772 Pump Units

2.8).

4.3):

1 2.805.0010 805 Dosimat

1 6.3026.150 Exchange unit 5 mL (for addition solutions)

1 6.3026.210 Exchange unit 10 mL (for auxiliary solutions)

1 2.685.0010 685 Dosimat

1 6.3026.153 Exchange unit 5 mL (for addition solutions)

1 6.3026.213 Exchange unit 10 mL (for auxiliary solutions)

1 6.2134.030 Cable 797–685

This section describes the procedure for the connection of 863 Compact Autosampler and 843 Pump Station. For the connection of Dosing devices, see section

For the addition of Volumes > 2 mL it is recommended to use

797 VA Computrace / Hardware-Manual 8.797.8001EN

6.1805.xxx tubings instead of the 4-way-microtip 6.1824.000.

2.8.

2.9 Connection of 863 Compact Autosampler

2.9.1 Electrical connection

Before any instruments are attached to the 797 VA Computrace Stand, the 797 VA Computrace Stand must be switched off using the

mains switch

The 863 Compact Autosampler is connected to the socket “Remote 2” of the 843 Pump Station with the cable 6.1241.230 (Autosampler accessory). The socket “Remote 1” of the 843 Pump Station is connected to the socket “Remote” 15 of the 797 VA Computrace Stand with the cable 6.2141.280 (Pump Station accessory) (see

15).

For connection of Dosing devices see section

14.

Fig.

2.8.

Fig. 15: Electrical connection of the 863 Compact Autosampler

Fig. 16: Tubing connections for operation of the 863 Compact Autosam-

pler

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

117

118

3 cm

Fig. 17: Installation of accessories for rinsing and siphoning off

Measuring head

FEP tubing (6.1805.100) for waste solution lead-off (attached)

PTFE tube (6.1819.010)

for supply of the waste solution to gas wash bottle

Gas wash bottle (6.2405.030)

for separating mercury from the waste solution (attached)

47 48

2 cm

117

118

119

120

2 cm

119

120

FEP tubing (6.1805.180)

for transferring the waste solution to gas wash bottle

FEP tubing (6.1805.020)

for supply of the rinsing solution

PTFE tube (6.1819.010)

for introduction of the rinsing solution to the measuring vessel

PTFE tube (6.1819.010)

for siphoning-off the waste solution

PTFE tube (6.1819.010)

for siphoning off the waste solution from gas wash bottle 47 (attached)

2.9.2 Tubing connections

For operation of the 797 VA Computrace Stand with 863 Compact Autosampler 843 Pump Station, the accessories and tubing connections must be installed according to Fig. 16. Proceed as follows:

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.9 Connection of 863 Compact Autosampler

1 Install accessories at 797 VA Computrace Stand

• Instead of the 6.1415.210 measuring vessel, install the 6.1456.210 measuring vessel at the 797 VA Computrace Stand.

• Cut PTFE tube from above in opening

• Cut the bottom end of PTFE tube from above in opening

119 (6.1819.010) to a length of max. 20 mm and insert

56 of the measuring head 24.

120 (6.1819.010) diagonally and insert

55 of the measuring head 24. To ensure that the

solution (particularly the mercury) is siphoned off as completely as possible, the end of the tube must be located in the deepest part of the 6.1456.210 measuring vessel (left rear when viewed from front).

• Screw FEP tubing

suring head FEP tubing

118 (tighten strongly, to prevent leakage of possibly corrosive

117 (6.1805.180) into threaded openings 55 and 69. 118 (6.1805.020) into threaded opening 56 of the mea-

24. Screw a 6.1808.000 tubing coupling to the other end of

liquid!) and insert the coupling in a slot of the tubing holder at the rear of the 797 VA Computrace Stand.

2 Connect 863 Compact Autosampler

• Install accessories at 863 Compact Autosampler (see Instructions for Use 863).

• Adjust 6.1835.030 Pipetting needle at the 863 Compact Autosampler to ensure that the lower end of the needle is positioned max. 0.5 mm above the bottom of the sample vessel (see

Fig. 18). This is essential to guarantee a complete transfer of the sample from the sample vessel into the measuring vessel of the 797 VA Computrace Stand.

• Insert 6.1822.410 transfer tubing connected to 6.1826.020 pump tubing from above into opening 797 VA Computrace Stand (see fix it by screwing the nipple.

60 of the measuring head 24 at the

Fig. 6) and

max. 0.5 mm

797 VA Computrace / Hardware-Manual 8.797.8001EN

Fig. 18: Adjusting the pipet-

ting needle

2 Installation

3 Connect 843 Pump Station

• On both membrane pumps, replace the two 6.1446.040 threaded stoppers by two 6.1820.010 screw connectors.

• Attach one end of a 6.1805.530 FEP tubing to the top screw connector of the siphoning pump (upper membrane pump). Attach the other end of the

6.1805.530 FEP tubing to one of the 6.1808.000 connection bushings of the waste container.

• Attach one end of a 6.1805.530 FEP tubing to the lower screw connector of the siphoning pump (upper membrane pump). Attach the other end of the 6.1805.530 FEP tubing to the 6.1808.000 connection bushing attached at the FEP tubing

Fig. 17).

and

38 of the 797 VA Computrace Stand (see Fig. 16

• Attach one end of a 6.1805.530 FEP tubing to the top screw connector of the rinsing pump (lower membrane pump). Attach the other end of the

6.1805.530 FEP tubing to the 6.1808.000 connection bushing attached at the FEP tubing

118 of the 797 VA Computrace Stand (see Fig. 16 and Fig.

17).

• Attach one end of a 6.1805.530 FEP tubing to the lower screw connector of the rinsing pump (lower membrane pump). Attach the other end of the

6.1805.530 FEP tubing to the 6.1602.115 bottle neck attachment of the storage container (see

Fig. 16 and Fig. 17).

5 Connect waste container

• Remove the cap nut of the small opening at the rear side of the waste container.

• Insert the 6.1828.020 "Tubing connection to the container" (with five M6 couplings 6.1808.000) into the smaller opening of the waste container and reattach the cap nut.

• Attach all tubings who are to lead to the waste container to a M6 coupling of the 6.1828.020 "Tubing connection to the container".

• Close not used M6 couplings of the 6.1828.020 "Tubing connection to the container" with a 6.1446.040 M6 thread stopper.

• Slightly open the cap of the larger opening. If the waste container is closed airtight, pressure builds which reduces pumping capacity.

6 Connect storage container

• Unscrew red filling connection from second 6.1621.000 container.

• Using a funnel, add max. 10 L rinsing solution (normally ultra pure water acidified with 100 μL conc. HCl/L) to the storage container.

• Screw 6.1618.050 threaded adapter to the container.

• Screw 6.1602.115 bottle neck attachment onto 6.1618.050 threaded

adapter.

• Remove screw nipple from 6.1829.020 FEP tube and insert it from above into the smallest opening of the 6.1602.115 bottle neck attachment.

• Screw a 6.1805.530 FEP tubing into this opening of the 6.1602.115 bottle neck attachment.

• Attach the other end of the 6.1805.530 FEP tubing at the lower end of the pump tubing of the rinsing pump (see

Fig. 16).

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.9 Connection of 863 Compact Autosampler

2.9.3 Software settings

Before putting the 797 VA Computrace Stand with the 863 Compact Autosampler into operation, the following settings have to be made in the "797 VA Computrace Software" software program:

1 Set dosing parameters

• Click on 797 VA COMPUTRACE / Settings / General settings and select the Dosi- tab (if the Dosino is connected to the 846 Dosing Interface: the Dosing

nos Interface

figuration:

tab) of the window General settings and enter the following con-

• Click on

to display the currently connected Dosing devices.

• Set parameters of used Dosing devices.

• Define the addition or predose solutions for the desired method in the

DOSINOS window (procedure see Software Manual, section 5.2).

• Fill the Dosing- or Exchange units of the Dosinos/Dosimats with the desired

solutions and make sure that there are no gas bubbles in the glass cylinders

using the

button in the DOSINO CONTROL window (see section

7.2, Software Manual).

• Note: If you choose Port 3 for menu item

Prep / Empty via port, you must

install an FEP Tubing Connection 6.1805.XXX from Port 3 to a waste container.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

2 Set automation parameters

• Select the Automation tab.

• Select „813/863 Compact Autosampler“ for the field Sample processor in

the Sample handling-part of the

• Check the checkbox

Relay box.

Automation tab.

• Normally, the default settings can be used for samples with 10 mL volume:

3 Test automation parameters

• Fill two sample vessels with water and place them in position 1 and 2 on the sample rack of the 863 Compact Autosampler.

• Click on

mation

• Click on

797 VA COMPUTRACE / Settings / General settings and select the Auto-

tab.

, check the automation parameters and modify them if

needed.

2.9.4 Operation of the 863 Compact Autosampler

After installation of the instruments according to sections 2.9.1...2.9.3 sample series using the 863 Compact Autosampler can be started. Proceed always in the following sequence:

1 Switch on instruments

• Switch on PC.

• Switch on 797 VA Computrace Stand.

• Switch on 863 Compact Autosampler and 843 Pump Station.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.10 Connection of 838 Advanced Sample Processor

• Start 797 VA Computrace Software (see Software Manual, section 2.2)

2 Load Autosampler method

• Load Method 2 of the 863 Compact Autosampler (see Instructions for Use 863, section 3.4)

3 Load and modify VA method

• Click on or 797 VA COMPUTRACE / Mode / Determination.

• Click on

or 797 VA COMPUTRACE / Window / Working method specification

to open the WORKING METHOD SPECIFICATIONS window.

• Load the desired method in the

WORKING METHOD SPECIFICATIONS window.

• If desired, modify the loaded method (details see Software Manual).

4 Load and modify sample table

• If you want to work with a sample table, set „Use sample table“ in the field

Working method source on the

Automation tab of the General settings

windows. With „Repeat current method“, every measurement is done with the same method, the sample table is not activated.

• Click on dow

SAMPLE TABLE.

or 797 VA COMPUTRACE / Window / Sample table to open the win-

• Load the desired sample table or change the currently loaded sample table (details see Software Manual).

5 Place samples on 863 Compact Autosampler

• Transfer the desired sample amount (5...10 mL) into the sample vessels and place them at the odd positions on the sample rack of the 863 Compact Autosampler.

• For each sample vessel, place a vessel filled with rinsing solution at the following even position (volume rinsing solution = volume sample solution).

6 Start determination

• Click on or MAIN WINDOW / Window / Monitor to open the MONITOR win- dow.

• Start the measurement by clicking the

icon in the MAIN WINDOW or the

button in the MONITORING window.

• Press the "START" button on the keypad of the 863 Compact Autosampler.

• Follow the instructions in the appearing message windows.

2.10 Connection of 838 Advanced Sample Processor

The 838 Advanced Sample Processor can be connected to the 797 VA Computrace. It is particularly used for electroplating bath analysis. For operation of this sample changer and the automatic addition of standard addition and auxiliary solutions by means of Dosing devices (see Section parts are needed (see also section

2.8), the following instruments and accessory

4.3):

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

Order no. Instrument/Accessory Complete

system

2.797.0030

2.838.0310

2.800.0010 800 Dosino

6.3032.120 807 Dosing Unit 2 mL

6.3032.250 807 Dosing Unit 50 mL

2.843.0040 843 Pump Station

6.1608.050 Bottle 100 mL

6.1608.070 Bottle 2 L

6.2055.100 Bottle holder

6.1618.020 Thread adapter

6.1805.020 52 cm tubing FEP

6.1805.120 100 cm tubing FEP

6.1805.530 200 cm tubing FEP

6.1819.010 PTFE tubing

6.2160.010 Adapter cable

6.5323.010 Rinsing equipment VA

797 VA Computrace for CVS

838 Advanced VA Sample Processor

1 1 1 1

3 2 3 1

3 1 2 1

1 1 1 -

1 1 1 1

2 1 2 1

1 1 1 -

1 - 1 1

2 - 2 1

1 1 1 -

3 2 3 1

1 1 1 -

2 2 2 2

1 1 1 1

Suppressor

determination

with DT / RC

Brightener

determination

with MLAT

Brightener

determination

with LAT

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.10 Connection of 838 Advanced Sample Processor

2.10.1 General composition

Instruments for a complete system

Fig. 19: Complete system for automation with the 838 Advanced Sample

Processor

Brightener/Suppressor analysis of electroplating baths can be fully automated with a 797 VA Computrace, an 838 Advanced Sample Processor, three 800 Dosinos, four 807 Dosing Units (one 50 mL, three 2 mL), and one 843 Pump Station. If (and which of) the 4 Dosing Units and 3 Dosinos are needed depends on the type of determination (see section

2.10.4 System description for Brightener determination with MLAT; 2.10.5 System description for Brightener determination with LAT).

Tubing connections for the rinsing equipment

2.10.3 System description for Suppressor determination;

Fig. 20: Tubing connections for the rinsing equipment with the 838 Ad-

vanced Sample Processor

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

Pipetting needle adjustment

Adjust 6.1835.040 or 6.1835.050 pipetting needle at the 838 Advanced Sample Processor to ensure that the lower end of the needle is positioned max. 0.5 mm above the bottom of the sample vessel. This is essential to guarantee a complete transfer of the sample from the sample vessel into the measuring vessel of the 797 VA Computrace Stand. Follow the Instructions for Use 838 for the definition of the "work position".

0.5 ... 1 mm

2.10.2 System description for a combined system for Brightener and Suppressor

Electrical connection

Before any instruments are attached to the 797 VA Computrace Stand, the 797 VA Computrace Stand must be switched off using the mains switch

14.

Fig. 21: Electrical connection for a combined system with the 838 Ad-

vanced Sample Processor

A 50 mL Dosing Unit filled with VMS is connected to Dosino 1. A 2 mL Dosing Unit filled with Brightener standard solution is connected to Dosino 2. For Brightener determination, a 2 mL Dosing Unit filled with Suppressor concentrate is connected to Dosino 3. For Suppressor determination (with "dilution titration technique"), a 2 mL Dosing Unit is connected to Dosino 3 to suck Suppressor standard solution or sample from the 838 rack.

Tubing connections

Below, the tubing connections for Suppressor determination with 11 mL sample vessels and Brightener determination with 50 mL sample vessels (and MLAT) are described.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.10 Connection of 838 Advanced Sample Processor

System description for Suppressor determination:

6.1805.530

to SIphoning Pump

6.1805.060

6.2744.010

6.2744.080

6.2833.020

6.1835.050

838

6.1831.080

6.1805.530

800 (1)

Metrohm

800 Dosino

6.1805.530

800 (2)

Metrohm

800 Dosino

6.1805.530

6.1828.020

6.1808.210

6.1805.530

6.2057.040

800 (3)

Metrohm

800 Dosino

2mL

VENT

6.1618.020

6.2744.010

6.2744.080

6.1808.210

6.1826.150

50 mL

VENT

6.1829.020

6.1805.120

6.1805.100

6.1805.120

2 x 6.1808.000

VENT

6.1543.060

2 x 6.1805.020

VENT

6.1543.060

6.1805.100

2 x 6.1819.010 (2 cm)

Fig. 22: Tubing connections for Suppressor determination with the 838

Advanced Sample Processor (and DT) with a combined system

5 x 6.1808.000 (already attached )

Waste

6.1446.040

6.1808.000

6.1824.000

System description for Brightener determination:

6.1805.530

to Siphoning Pump

6.1805.530

6.1808.210

6.1826.150

6.1805.530

800 (1)

Metrohm

800 Dosino

VENT

6.1829.020

6.1805.120

6.1805.100

6.1805.120

2 x 6.1808.000

6.2744.010

6.2744.080

6.2833.020

6.1835.050

838

6.1805.060

6.2057.040

6.1831.080

2mL

6.1618.020

6.2744.010

6.2744.080

6.1808.210

VENT

6.1805.530

800 (2)

Metrohm

800 Dosino

2mL

VENT

6.1543.060

2 x 6.1805.020

6.1805.530

800 (3)

Metrohm

800 Dosino

2mL

VENT

6.1805.100

2 x 6.1819.010 (2 cm)

6.1828.020

6.1543.060

5 x 6.1808.000 (already attached)

Waste

6.1446.040

6.1808.000

6.1824.000

Fig. 23: Tubing connections for Brightener determination with the 838 Ad-

vanced Sample Processor with a combined system

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

For the modification from a Suppressor system to a Brightener system, following procedure is recommended:

1 Permute Dosino 3

• Remove Dosino 3 from the 2 mL Dosing Unit attached to the 838 Advanced Sample Processor.

• Attach Dosino 3 to the 2 mL Dosing Unit with Suppressor concentrate.

2 Unscrew 6.1831.080 PEEK capillary from needle clamp

• Unscrew 6.2744.010 PEEK pressure screw from the 6.2744.080 M6 coupling at the robotic arm of the 838 Advanced Sample Processor.

• Unscrew 6.2744.080 M6 coupling from the 6.2833.020 needle clamp.

3 Attach 6.1805.060 FEP tubing to the needle clamp

• Attach pre-assembled 6.1805.060 FEP tubing to the 6.2833.020 needle clamp.

Tubing connections at the measuring head of the 797

843 Rinsing pump

6.1805.020 + 6.1819.010 (shorten to 2 cm)

For Brightener determination: Sample from 838

6.1805.120 + 6.1819.010 (shorten to 2 cm)

Waste

6.1805.180

Waste

6.1819.010

800 Dosino for VMS (Dosino 1 Port 1)

6.1805.020 + 6.1819.010 (shorten to 2 cm)

4-way microtip (from 800 Dosinos) Dosino 3 (Port 1)

Brigthener determination: Suppressor concentrate Suppressor determination: Suppressor standard solution or sample

Dosino 2 (Port 1)

Brightener determination: Brightener standard solution

843 Waste (Syphoning pump)

6.1805.470 (already attached)

Fig. 24: Measuring head for a combined system with the 838 Advanced

Sample Processor

For software settings and measurement procedures: see Software Manual 797 section

8.6, and the Online-Help of the <797 VA Computrace Software>.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.10 Connection of 838 Advanced Sample Processor

2.10.3 System description for Suppressor determination

Electrical connection

Before any instruments are attached to the 797 VA Computrace Stand, the 797 VA Computrace Stand must be switched off using the

mains switch

A composition with two Dosinos connected to the 797 is recommended for the Suppressor determination with the DT (dilution titration technique) or RC (response curve technique):

14.

Fig. 25: Electrical connection for Suppressor determination with the 838

Advanced Sample Processor

A 50 mL Dosing Unit filled with "VMS" (with "dilution titration technique") or "Electrolyte" (with "response curve technique") is connected to Dosino 1.

A 2 mL Dosing Unit is connected to Dosino 3. With the "dilution titration technique", it is used to suck in Suppressor standard solution or sample from the sample vessels on the 838 rack. With the "response curve technique" it is used to dose Suppressor standard solution from the dosing unit to the measuring cell to record the "response curve" (see Software Manual section 8.6, or in the Online Help section Suppressor

analysis with 838 Advanced Sample Processor and DT or Suppressor analysis with 838 Advanced Sample Processor and RC).

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

Tubing connections for suppressor determination with DT

800 (1)

Metrohm

6.1805.530

6.1831.080

800 Dosino

VENT

6.2744.010

6.2833.000

6.1835.040

838

6.2057.040

800 (3)

Metrohm

800 Dosino

VENT

6.1618.020

6.2744.010

6.2744.080

to Siphoning Pump

6.1805.120

6.1829.020

3 x 6.1446.040

6.1808.000

6.1805.020

3 x 6.1808.000

6.1824.000

6.1819.010 (2 cm)

Fig. 26: Tubing connections for Suppressor determination (with DT) with

the 838 Advanced Sample Processor

Tubing connections for suppressor determination with RC

6.1805.530

to siphoning pump

6.1805.060

6.2833.020

6.1835.050

6.1805.530

6.1808.210

800 (1)

Metrohm

800 Dosino

VENT

6.1805.530

800 (3)

Metrohm

800 Dosino

VENT

6.1805.100

6.1828.020

6.1805.530

6.1828.020

6.1543.060

3 x 6.1808.000

6.1805.530

2 x 6.1446.040

Waste

6.1446.040

5 x 6.1808.000 (already attached)

Waste

3 x 6.1446.040

2 x 6.1805.020

6.1808.210

6.1826.150

6.1829.020

6.1805.120

2 x 6.1808.000

838

2 x 6.1819.010 (2 cm)

Fig. 27: Tubing connections for Suppressor determination (with RC) with

the 838 Advanced Sample Processor

797 VA Computrace / Hardware-Manual 8.797.8001EN

6.1824.000

2.10 Connection of 838 Advanced Sample Processor

Tubing connections at the measuring head of the 797

843 Rinsing pump

6.1805.020 + 6.1819.010 (shorten to 2 cm)

800 Dosino for VMS (Port 1 Dosino 1)

6.1805.020 + 6.1819.010 (shorten to 2 cm)

Waste

6.1819.010

Waste

6.1805.180

800 Dosinos for suppressor standard / sample (Port 1 Dosino 3) 4-way microtip 6.1824.000

843 Waste (Syphoning pump)

6.1805.470 (already attached)

Fig. 28: Measuring head for Suppressor determination with the 838 Ad-

vanced Sample Processor

For software settings and measurement procedures: see Software Manual 797 section

8.6, and Online-Help of the <797 VA Computrace Software> section Suppressor analysis with 838 Advanced Sample Processor and DT or Suppressor analysis with 838 Advanced Sample Processor and RC.

2.10.4 System description for Brightener determination with MLAT

Electrical connection

Before any instruments are attached to the 797 VA Computrace Stand, the 797 VA Computrace Stand must be switched off using the

mains switch

14.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

A composition with three to the 797 connected Dosinos is recommended for the Brightener determination with the Calibration technique MLAT:

Fig. 29: Electrical connection for Brightener determination with the 838

Advanced Sample Processor and MLAT

A 50 mL Dosing Unit filled with VMS is connected to Dosino 1. A 2 mL Dosing Unit filled with Brightener standard solution is connected to Dosino 2. A 2 mL Dosing Unit filled with Suppressor concentrate is connected to Dosino 3.

Tubing connections

The choice of the tubing connections depends on the sample volume. Following 2 options are described:

• Sample volume <10 mL in 11 mL sample vessels

• Sample volume >10 mL in 50 mL sample vessels

Use thicker tubes for larger sample volumes.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.10 Connection of 838 Advanced Sample Processor

Sample volume > 10 mL

6.1805.530

to siphoning pump

6.1446.040

5 x 6.1808.000 (already attached)

6.1805.060

6.2833.020

6.1835.050

838

Fig. 30: Tubing connections for Brightener determination for sam-

Sample volume < 10 mL

6.1805.530

6.1808.210

6.1826.150

800 (1)

Metrohm

800 Dosino

VENT

6.1829.020

6.1805.120

6.1805.100

6.1805.120

2 x 6.1808.000

6.1805.530

800 (2)

Metrohm

800 Dosino

VENT

6.1543.060

6.1805.530

2 x 6.1805.020

800 (3)

Metrohm

800 Dosino

VENT

6.1805.100

2 x 6.1819.010 (2 cm)

6.1828.020

6.1543.060

2 x 6.1808.000

Waste

2 x 6.1446.040

6.1824.000

ples>10mL with the 838 Advanced Sample Processor and MLAT

6.1831.070

6.2744.010

6.2833.000

6.1835.040

838

6.1805.530

to siphoning pump

6.2744.010

6.2744.160

6.2744.010

6.2744.160

6.1826.020

6.1805.530

6.1829.020

800 (1)

Metrohm

800 Dosino

VENT

6.1805.120

6.1822.420

6.1805.530

800 (2)

6.1805.100

Metrohm

800 Dosino

VENT

6.1808.000

6.1543.060

6.1805.530

6.1805.020

800 (3)

Metrohm

800 Dosino

VENT

6.1828.020

6.1543.060

6.1805.100 2 x 6.1808.000

6.1819.010 (2 cm)

Fig. 31: Tubing connections for Brightener determination for sam-

ples<10mL with the 838 Advanced Sample Processor and MLAT

6.1446.040

5 x 6.1808.000 (already attached)

Waste

2 x 6.1446.040

6.1824.000

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

Tubing connections at the measuring head of the 797

sample volume >10 mL

843 Rinsing pump

6.1805.020 + 6.1819.010 (shorten to 2 cm)

Sample from 838

6.1805.120 + 6.1819.010 (shorten to 2 cm)

Waste

6.1819.010

800 Dosino for VMS (Port 1 Dosino 1)

6.1805.020 + 6.1819.010 (shorten to 2 cm)

Waste

6.1805.180

843 Waste (Syphoning pump)

6.1805.470 (already attached)

800 Dosinos for suppressor concentrate (Port 1 Dosino 3) + brightener standard (Port 1 Dosino 2) 4-way microtip 6.1824.000

Fig. 32: Measuring head for Brightener determination for samples>10mL

with the 838 Advanced Sample Processor and MLAT

sample volume <10 mL

843 Rinsing pump

6.1805.020 + 6.1819.010 (shorten to 2 cm)

Sample from 838

6.1822.420

Waste

6.1819.010

800 Dosino for VMS (Port 1 Dosino 1)

6.1805.020 + 6.1819.010 (shorten to 2 cm)

Waste

6.1805.180

800 Dosinos (Port 1 Dosino 3) + brightener standard (Port 1 Dosino 2) 4-way microtip 6.1824.000

843 Waste (Syphoning pump)

6.1805.470 (already attached)

Fig. 33: Measuring head for Brightener determination for samples>10mL

with the 838 Advanced Sample Processor and MLAT

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.10 Connection of 838 Advanced Sample Processor

For software settings and measurement procedures: see Software Manual 797 section 8.6, and Online-Help of the <797 VA Computrace Software> section Brightener Analysis with the 838 Advanced Sample Processor and MLAT.

2.10.5 System description for Brightener determination with LAT

Electrical connection

Before any instruments are attached to the 797 VA Computrace Stand, the 797 VA Computrace Stand must be switched off using the

mains switch

A composition with one Dosino connected to the 797 is recommended for the Brightener determination with the Calibration technique LAT:

14.

Fig. 34: Electrical connection for Brightener determination with the 838

Advanced Sample Processor and LAT

A 2 mL Dosing Unit filled with VMS is connected to Dosino 2.

Tubing connections

It is recommended to work with sample volumes >10 mL for Brightener determination with LAT. The tubing connection should be as follows:

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

Brightener sample volume > 10 mL

6.1805.530

to siphoning pump

3 x 6.1446.040

5 x 6.1808.000 (already attached)

6.1805.530

6.1805.060

6.1808.210

800 (2)

Metrohm

800 Dosino

VENT

6.1828.020 Waste

6.2833.020

6.1835.050

6.1808.210

6.1826.150

6.1805.120

6.1805.100

6.1808.000

6.1543.060

6.1805.020

838

Fig. 35: Tubing connections for Brightener determination with the 838 Ad-

vanced Sample Processor and LAT

Tubing connections at the measuring head of the 797

843 Rinsing pump

6.1805.020 + 6.1819.010 (shorten to 2 cm)

Waste

6.1819.010

Waste

6.1805.180

3 x 6.1446.040

3 x 6.1808.000

6.1824.000

6.1819.010 (2 cm)

843 Waste (Syphoning pump)

6.1805.470 (already attached)

Sample from 838

6.1805.120 + 6.1819.010 (shorten to 2 cm)

800 Dosinos for brightener standard (Port 1 Dosino 2) 4-way microtip 6.1824.000

Fig. 36: Tubing connections for Brightener determination with the 838 Ad-

vanced Sample Processor and LAT

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.11 Control lines

Control lines for 863 Compact Autosampler, 766 Sample Processor, 838 Advanced Sample Processor and 731 Relay Box are listed in the table below:

797 VA Computrace 863 Compact

Autosampler

Pin 3 (End of sample)

Pin 4 (End of sample table)

Pin 5 (Start) Pin 12 (Input 7)

Pin 6 (Set Control line) Pin 22 (Input 2) Pin 22 (Input 2)

Pin 7 (Siphoning)

Pin 8 (Rinsing)

Pin 17 (Scan Control line)

Pin 10 (Input 3)

Pin 24 (Input 6)

Pin 5 (Output 0)

2.12 Connection of peripherals

The USB Connections (19) USB1 and USB2 on the backside of the 797 VA Compu- trace Stand serve as USB-distributor of the connected PC. Any USB-instrument (e.g. printer or 846 Dosing Interface) can be operated with these connections.

838 Advanced

Sample

Processor

731 Relay Box

Pin 7 (Output 9)

Pin 8 (Output 10)

For connection and installation of a particular instrument read the respective “Instructions for Use” of the instrument and operating system.

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

2.13 Communication diagrams for automation

In this chapter, sequence diagrams are used to describe the communication between the devices for automation with a 838 Advanced Sample Processor.

The communication sequence depends on the selected Calibration technique in the window

The 797 VA Computrace acts as master.

The TTL's used in the diagram match with the following connections:

WORKING METHOD SPECIFICATION.

TTL 797 VA Computrace 838 Advanced

Sample

Processor

1 Pin 3 (End of sample)

2 Pin 4 (End of sample table)

Pin 10 (Input 3)

Pin 24 (Input 6)

3 Pin 5 (Start) Pin 12 (Input 7)

4 Pin 6 (Set Control line) Pin 22 (Input 2)

5 Pin 7 (Siphoning)

6 Pin 8 (Rinsing)

7 Pin 17 (Scan Control line)

Pin 5 (Output 0)

Legend to the communication diagrams (Section

Signal wird von einem Gerät an ein anderes gesendet

Sequenz-Block (der im Diagramm nicht detailliert beschrieben wird)

2.13.1 - 2.13.6):

731 Relay Box

Pin 7 (Output 9)

Pin 8 (Output 10)

Warten eines Gerätes auf ein eintreffendes Signal

YES

Alternativer Sequenz-Ablauf

Ein- oder mehrmalige Wiederholung des Sequenz-Teils zwischen Pfeilanfang und -ende

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.13 Communication diagrams for automation

2.13.1 Communication diagram VA

Standard addition / Sample with calibration curve / Record calibration curve

Dosinos 1..3

Prep Dosino 1, 2, 3

No. of rinsing cycles

YES

797 VA Computrace

Scan line : 838 ready

(TTL 7)

Wait siphoning time

Prep Dosino 1,2,3 ?

YES

No. of Prep cycles

Wait siphoning time

Wait rinsing time

Wait siphoning time

Is it the

first sample of the

sequence ?

Wait siphoning time

Scan line : 838 ready

Set line: Sample transfer (TTL 4)

(TTL 7)

Set line: Start 838 (TTL 3)

Ready (TTL 7)

838 Advanced Sample

Processor

Set line: Siphoning (TTL 5)

Set line: Rinsing (TTL 6)

Set line: Siphoning (TTL 5)

731 Relay Box

Predose Dosino 1, 2, 3

No. of rinsing cycles

YES

<Use for predose> active ?

YES

Measurement

Wait siphoning time

Scan line : 838 ready

(TTL 7)

Wait siphoning time

Wait rinsing time

Export/Print results

More samples ?

Set line: End of sample table (TTL 2)

Timeline

Set line: Siphoning (TTL 5)

Set line: Rinse needle (TTL 4)

Ready (TTL 7)

Set line: Siphoning (TTL 5)

Set line: Rinsing (TTL 6)

Set line: End of sample (TTL 1)

End

Fig. 37: Communication diagram for VA

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

2.13.2 Communication diagram LAT

LAT Standard addition for brighteners / LAT Record intercept value

Prep Dosino 1, 2, 3

No. of rinsing cycles

YES

797 VA ComputraceDosinos 1..3

Scan line : 838 ready

(TTL 7)

Wait siphoning time

Prep Dosino 1,2,3 ?

YES

Wait siphoning time

Wait rinsing time

Wait siphoning time

Is it the

first sample of the

sequence ?

Wait siphoning time

Set line: Start 838 (TTL 3)

Ready (TTL 7)

No. of Prep cycles

838 Advanced Sample

Processor

Set line: Siphoning (TTL 5)

Set line: Rinsing (TTL 6)

Set line: Siphoning (TTL 5)

731 Relay Box

Predose

No. of rinsing cycles

YES

Scan line : 838 ready

<Use for predose> active ?

YES

Set line: Sample transfer (TTL 4)

(TTL 7)

Measurement

Wait siphoning time

Scan line : 838 ready

(TTL 7)

Wait siphoning time

Wait rinsing time

Export/Print results

More samples ?

Set line: End of sample table (TTL 2)

Timeline

Ready (TTL 7)

Set line: Siphoning (TTL 5)

Set line: Rinse needle (TTL 4)

Ready (TTL 7)

Set line: Siphoning (TTL 5)

Set line: Rinsing (TTL 6)

Set line: End of sample (TTL 1)

End

Fig. 38: Communication diagram for LAT

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.13 Communication diagrams for automation

2.13.3 Communication diagram MLAT

MLAT Standard addition for brighteners

Prep Dosino 1, 2, 3

No. of rinsing cycles

YES

797 VA ComputraceDosinos 1..3

Scan line : 838 ready

(TTL 7)

Wait siphoning time

Prep Dosino 1,2,3 ?

YES

Wait siphoning time

Wait rinsing time

Wait siphoning time

Is it the

first sample of the

sequence ?

Wait siphoning time

Set line: Start 838 (TTL 3)

Ready (TTL 7)

No. of Prep cycles

838 Advanced Sample

Processor

Set line: Siphoning (TTL 5)

Set line: Rinsing (TTL 6)

Set line: Siphoning (TTL 5)

731 Relay Box

Note: Use <Use for

predose> to dose

VMS via Dosino 1 and

„Suppressor concent-

rate“ via Dosino 3

Note: Use <Use after

sample tranfer> to do-

se „Suppressor con-

centrate“ via Dosino 3

Predose

Dose

No. of rinsing cycles

YES

<Use for predose> active ?

YES

Measure Intercept

Scan line : 838 ready

(TTL 7)

<Use after

sample transfer>

active ?

YES

Set line: Sample transfer (TTL 4)

Measurement

Wait siphoning time

Scan line : 838 ready

(TTL 7)

Wait siphoning time

Wait rinsing time

Export/Print results

More samples ?

Set line: Rinse needle (TTL 4)

Set line: End of sample (TTL 1)

Set line: End of sample table (TTL 2)

Ready (TTL 7)

Set line: Siphoning (TTL 5)

Ready (TTL 7)

Set line: Siphoning (TTL 5)

Set line: Rinsing (TTL 6)

Timeline

End

Fig. 39: Communication diagram for MLAT

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

2.13.4 Communication diagram DT

DT Suppressors with calibration curve / DT Record calibration curve

Prep Dosino 1, 2

Prep Dosino 3

No. of rinsing cycles

797 VA ComputraceDosinos 1..3

Scan line : 838 ready

(TTL 7)

Wait siphoning time

Prep Dosino 1,2 ?

YES

Wait siphoning time

Scan line : 838 ready

(TTL 7)

Prep Dosino 3 ?

YES

Wait siphoning time

Wait rinsing time

Wait siphoning time

838 Advanced Sample

Set line: Start 838 (TTL 3)

Ready (TTL 7)

Set line: Siphoning (TTL 5)

No. of Prep cycles

Set line: Immerse needle into sample (TTL 4)

Ready (TTL 7)

No. of Prep cycles

Set line: Siphoning (TTL 5)

Set line: Rinsing (TTL 6)

Set line: Siphoning (TTL 5)

Processor

731 Relay Box

Note: Use <Use

for predose> to

dose VMS via

Dosino 1

Note: Is only

done, if Dosino 3

was preped before

Predose

Empty Dosino 3

YES

Prep Dosino 3

No. of rinsing cycles

<Use for predose> active ?

YES

Measurement

Wait siphoning time

Export/Print results

More samples ?

Scan line : 838 ready

Prep Dosino 3 ?

Wait siphoning time

Wait rinsing time

Set line: Move to rinsing vessel (TTL 4)

(TTL 7)

YES

No. of Prep cycles

Set line: End of sample table (TTL 2)

Timeline

Set line: Siphoning (TTL 5)

Set line: End of sample ( TTL 1)

Ready (TTL 7)

Set line: Siphoning (TTL 5)

Set line: Rinsing (TTL 6)

End

Fig. 40: Communication diagram for DT

797 VA Computrace / Hardware-Manual 8.797.8001EN

2.13 Communication diagrams for automation

2.13.5 Communication diagram "RC Record response curve"

RC Record response curve

Prep Dosino 1, 2, 3

No. of rinsing cycles

YES

797 VA ComputraceDosinos 1..3

Scan line : 838 ready

(TTL 7)

Wait siphoning time

Prep Dosino 1,2,3 ?

YES

Wait siphoning time

Wait rinsing time

Wait siphoning time

Is it the

first sample of the

sequence ?

Wait siphoning time

Scan line : 838 ready

(TTL 7)

Set line: Start 838 (TTL 3)

Ready (TTL 7)

No. of Prep cycles

Set line: Sample transfer (TTL 4)

Ready (TTL 7)

838 Advanced Sample

Processor

Set line: Siphoning (TTL 5)

Set line: Rinsing (TTL 6)

Set line: siphoning (TTL 5)

Set line: Siphoning (TTL 5)

731 Relay Box

Note: Use <Use

for predose> to

dose Electrolyte

via Dosino 1

Predose

No. of rinsing cycles

YES

<Use for predose> active ?

YES

Measurement

Wait siphoning time

Scan line : 838 ready

(TTL 7)

Wait siphoning time

Wait rinsing time

Export/Print results

More samples ?

Set line: End of sample table (TTL 2)

Timeline

Set line: Siphoning (TTL 5)

Set line: Rinse needle (TTL 4)

Ready (TTL 7)

Set line: Siphoning (TTL 5)

Set line: Rinsing (TTL 6)

Set line: End of sample (TTL 1)

End

Fig. 41: Communication diagram for "RC Record response curve"

797 VA Computrace / Hardware-Manual 8.797.8001EN

2 Installation

2.13.6 Communication diagram "RC Sample with response curve"

RC Sample with response curve

Note: Use <Use for predose> to dose Electrolyte

via Dosino 1

Prep Dosino 1, 2, 3

No. of rinsing cycles

YES

Predose

Dose

797 VA ComputraceDosinos 1..3

Scan line: Waiting for

START signal

Wait siphoning time

Prep Dosino 1,2,3 ?

YES

Wait siphoning time

Wait rinsing time

Wait siphoning time

first sample of the

sequence ?

Wait siphoning time

YES

Is it the

active ?

No. of Prep cycles

Measure Q(0)

Remove Elect-

rolyte before adding the pro-

duction bath ?

YES

Wait siphoning time

Scan line: Waiting for

START signal

<Use after

sample transfer>

active ?

YES

Set line: Transfer sample (TTL 4)

Set line: Start 838 (TTL 3)

Ready (TTL 7)

838 Advanced Sample

Processor

Set line: Siphoning (TTL 5)

Set line: Rinsing (TTL 6)

Set line: Siphoning (TTL 5)

731 Relay Box

Measurement

Wait siphoning time

Scan line: Waiting for

Wait siphoning time

No. of rinsing cycles

Export/Print results

YES

START signal

Wait rinsing time

More samples ?

Timeline

Set line: Rinse Capillary (TTL 4)

Ready (TTL 7)

Set line: End of sample (TTL 1)

Set line: End of sample table (TTL 2)

Set line: Siphoning (TTL 5)

Set line: Rinsing (TTL 6)

Measurement end

Fig. 42: Communication diagram for "RC Sample with response curve"

797 VA Computrace / Hardware-Manual 8.797.8001EN

3.1 Electrical safety

3 Safety

3.1 Electrical safety

While electrical safety in the handling of the 797 VA Computrace Stand is assured in the context of the specifications IEC 61010-1 (protection class 1), the following points should be noted:

• Mains connection

Setting mains connection must be effected in accordance with the instructions in section

• Opening the instrument

2.2.1.

When the 797 VA Computrace Stand is connected to the power supply, the instrument may not be opened nor parts of them be removed, otherwise there is a danger of coming into contact with components which are live. Before you open the 797 VA Computrace Stand to change components or for maintenance or repair work, always switch on the instrument by setting the mains switch to the ON position and then disconnect the mains cable from the mains connection plug of the 797 VA Computrace Stand!

• Protection against static charges

Electronic components are sensitive to static charging and can be destroyed by discharges. Before you touch any of the components inside the 797 VA Computrace Stand, you should earth yourself and any tools you are using by touching an earthed object (e.g. metal housing of the instrument or a radiator) to eliminate any static charges that exist.

797 VA Computrace / Hardware-Manual 8.797.8001EN

3 Safety

3.2 Change fuses

The fuses of the 797 VA Computrace are placed between the mains switch 14 and the mains connection plug lows:

1 Disconnect mains cable

Disconnect mains cable from mains connection plug 16 of the 797 VA Computrace.

2 Remove fuse cover

Using a screwdriver, lever out fuse cover 15 forwards until it opens.

3 Check and change fuses if necessary

Carefully take the fuses installed for the desired mains voltage out of the fuse holder and check its specifications:

16 under the Fuse cover. To change them, proceed as fol-

100…240 V 1.6 AHT Metrohm-Nr.

Change fuses if necessary and reinsert in fuse holder.

4 Install fuse holder

Reinsert fuse holders in the instrument (the arrows printed on the holders must point in the same direction as the arrows on the inside of fuse cover

5 Install fuse cover

Push in fuse cover 15 firmly until it clicks into place.

6 Connect mains cable

Plug mains cable into mains connection plug 16.

15).

3.3 Cabinet temperature

The cabinet of the 797 VA Computrace stand locally heats up to 45°C or more.

U.600.0018

797 VA Computrace / Hardware-Manual 8.797.8001EN

3.4 Safety considerations concerning mercury

3.4.1 Properties of mercury

The most important properties of mercury (Hg) are listed in the Table below. This compilation allows the following summary:

• Mercury is a heavy metal with a very high density and is liquid at room tem- perature.

• Mercury is mobile at room temperature and tends to form drops because of its high surface tension. The surface tension is around 6 times greater than that of water; Hg is thus not wetted by water.

• Mercury has a relatively high electrical conductivity (at room temperature it is only some 60 times lower than that of silver).

• Mercury has a relatively high vapor pressure compared with other metals. Mercury vapor is some seven times heavier than air (so that it sinks rapidly and specifically to the floor).

• The odor threshold is very high relative to the threshold limit value (TLV).

• Air saturated with Hg vapor (which naturally does not occur in practice) con-

tains approximately 250 times the amount of Hg specified by the TLV at room temperature.

Properties of mercury

Property Value Ref.

Density ρ (liquid mercury) 13.5451 g/cm3 (at Θ = 0 °C) [1]

Density ρ (mercury vapor) 8.959 g/dm3 (at Θ = 0 °C) [2]

Melting point

Melting enthalpy ΔHF 2.295 kJ/mol (at p

Boiling point

Boiling enthalpy ΔHF 59.1 kJ/mol (at p

Vapor pressure p 0.0253 Pa (at

Mass concentration ρ in air (after reaching equilibrium)

Evaporation rate 85 μg/h·cm2 (at Θ = 25 °C) [2]

Surface tension σ 4.67·10–3 N/cm (at Θ = 20 °C) [5]

Electrical conductivity κ 1.044·104 S/cm (at Θ = 20 °C) [6]

Odor threshold 13 mg/m3 [2]

Threshold limit value (TLV) for air

for mercury for organic mercury com-

pounds (calculated as Hg)

–38.86 °C (at p

356.73 °C (at p

0.17 Pa (at Θ = 20 °C)

0.391 Pa (at

0.81 Pa (at

1.69 Pa (at Θ = 50 °C)

2.0 mg/m3 (at Θ = 0 °C)

13.6 mg/m

29.6 mg/m

62.7 mg/m3 (at Θ = 40 °C) 126 mg/m3 (at Θ = 50 °C)

0.1 mg/m

0.01 mg/m3

(at Θ = 20 °C)

(at Θ = 30 °C)

= 1.01325 bar) [3]

air

= 1.01325 bar) [3]

air

= 1.01325 bar) [3]

air

= 1.01325 bar) [3]

air

= 0 °C)

= 30 °C)

= 40 °C)

[2, 4]

[4, 7]

[2, 4, 7]

797 VA Computrace / Hardware-Manual 8.797.8001EN

3 Safety

3.4.2 Toxicity of mercury and its compounds

Mercury and its compounds are toxic since they react with enzymes containing sulfur and decompose them with the formation of HgS. The toxicity depends on the chemical and physical state of the mercury [4, 8 – 10]:

• Metallic liquid mercury is readily resorbed by the skin and finds its way through glandular passages into lower skin regions where it is oxidized and carried on as a salt.

• The low-solubility mercury (I) compounds and metallic mercury in the form of a coherent liquid have low toxicity when taken up orally (but not through the skin!).

• Mercury (II) compounds are more readily soluble and therefore much more toxic: LD100 (the 100% lethal dose) for oral take-up is approx. 0.2…1 g.

• Mercury vapor is highly toxic: vapor with an Hg concentration exceeding the

TLV of 0.1 mg/m

air causes chronic poisoning after prolonged breathing for 5

to 8 hours per day.

Despite the large number of laboratories involved in polarographic/voltammetric work, sensible and proper handling (see section case of mercury poisoning has been reported to date. The real Hg concentrations measured in the laboratory atmosphere are consistently far below the TLV (threshold limit value).

3.4.3 Handling of mercury

Several safety rules, described in detail in what follows, must be observed in the handling of mercury owing to its toxicity (see section

• Working in a fume cupboard The handling of mercury should, if possible, always be carried out in a fume cupboard (hood). It must be ensured that no metal drops or spilling drop on the floor or the lab bench and that no evaporation of the metal occurs.

• Working over plastic trays Movements with vessels containing mercury must be carried out in, or at least above, rigid seamless trays made from plastic or enameled metal. The supplied

6.2711.030 Drip pan made of polystyrene is eminently suitable for this.

3.4.3 has ensured that not one single

3.4.2):

• Collecting mercury from the measuring vessel If work is performed with the MME, at the end of the determination the analysis solution contains mercury, which must be collected for later disposal. This can be done by collecting the analysis solutions in a large vessel and then decanting, by filtering the analysis solutions or by siphoning off the mercury using vacuum.

• Trapping of mercury drops Single mercury drops in this drip pan or any other spilt mercury can be bound in a simple manner by amalgamation:

− with silver (Ag): Metrohm drop catcher Type 6.2406.000 which is included in the standard outfit of the 797 VA Computrace Stand

− with tin (Sn): e.g. the thin tin foil supplied by Merck, Darmstadt/FRG

797 VA Computrace / Hardware-Manual 8.797.8001EN

3.4 Safety considerations concerning mercury

with special laboratory aids:

e.g. Mercurisorb-Roth™ from Roth, Karlsruhe/FRG; e.g. Mercury Sponge™ and Resisorb™ from Baker, Phillipsburg, N.J./USA

• Empty reservoir of mercury trap regularly The storage container of the 6.2406.000 mercury trap should be emptied regularly and rinsed thoroughly several times. If the mercury trap is needed outside the fume cupboard, a minimum safety distance of 50 cm between the head and the mercury trap must be observed.

• Never leave mercury in open vessels Mercury must never be left exposed to the air. The upper layer of water or supporting electrolyte in no way suppresses nor reduces Hg evaporation [11, 12].

• Store mercury container in fume cupboard The tightly closed mercury container as well as all parts that come into contact with mercury must be stored in a fume cupboard, which is always switched on.

• Use gas wash bottles when siphoning off mercury under vacuum If mercury is siphoned off under vacuum using a water jet pump, one or two gas wash bottles must always be connected between the vacuum pump and the suction tube to ensure trapping of the siphoned-off mercury.

• Ventilate laboratory areas well Rooms where work with mercury is being carried out should be thoroughly aired from time to time.

• Dispose of mercury properly Mercury can be cleaned by distillation [13 – 16], but the apparatus is extensive and the time needed considerable. For this reason, waste mercury is normally collected in a closed container and then sent for disposal to the responsible authorities in accordance with the national legal requirements

797 VA Computrace / Hardware-Manual 8.797.8001EN

3 Safety

3.4.4 References dealing with mercury

[1] Documenta Geigy

Wissenschaftliche Tabellen, 7. edition, page 210 (”Masseinheiten, Dichte”), Georg Thieme Verlag, Stuttgart (BRD), 1975

[2] Berufsgenossenschaft der chemischen Industrie (Herausgeber)

Quecksilber und seine Verbindungen Merkblatt, Seite 3...4, Verlag Chemie, Weinheim (BRD), 1980

[3] Synowietz, C.; Schäfer, K. (Herausgeber)

Chemiker-Kalender, 3. edition, 560/561, 590 Springer-Verlag, Berlin+Heidelberg (BRD), 1984

[4] Falbe, J.; Regitz, M.

Römpps-Chemie-Lexicon, 9. edition, page 3737 Georg Thieme Verlag, Stuttgart, New York, 1992

[5] D'Ans/Lax

Taschenbuch für Chemiker und Physiker, 3. edition, volume I, page

1...135 Springer-Verlag, Berlin+Heidelberg (BRD), 1967

[6] Weast, R.C. (Editor)

Handbook of Chemistry and Physics, 57 The Chemical Rubber Publishing Co., Cleveland, Ohio (USA), 1976

[7] Roth, L.

Sicherheitsdaten MAK-Werte, 3. edition Ecomed Verlagsgesellschaft GmbH, München, 1984

[8] Mutschler, E.

Arzneimittelwirkungen, Page 379 Wissenschaftliche Verlagsgesellschaft, Stuttgart (BRD), 1970

[9] Auterhoff, H.

Lehrbuch der pharmazeutischen Chemie, page 75 Wissenschaftliche Verlagsgesellschaft, Stuttgart (BRD), 1968

[10] Strong, L.E.

Mercury Poisoning J. Chem. Educ. 49

(1972), 28

[11] Sanders, M.L.; Becket, R.R.

The Mercury-Water System J. Chem. Educ. 52

(1975), 117

[12] Lo, J.M.; Wal, C.M.

Mercury Loss from Water during Storage – Mechanisms and Prevention

Anal. Chem. 47

(1975), 1869

[13] Monaghan, C.P.; O'Brien, E.J. (Jr.); Good, M.L.

Cleaning Mercury J. Chem Educ. 55

(1978), Fasc 11., 734

[14] Bergmeyer, H.U.

Vollautomatische Quecksilber-Waschapparatur für den Laboratoriumsgebrauch

Chem. Ing. Techn. 22

(1950), 330

[15] Hamilton, P.B.

Continuous Mercury Still Anal. Chem. 23

(1951), 1526

edition, page E-84, B-32

797 VA Computrace / Hardware-Manual 8.797.8001EN

3.4 Safety considerations concerning mercury

[16] Quecksilberreinigung

(1962), 351

GIT 6

797 VA Computrace / Hardware-Manual 8.797.8001EN

4 Appendix

4.1 Technical data

Brief characterization

PC-controlled system for voltammetry, set chemical workplace with potentiostat and measuring amplifier.

With Multi-Mode Electrode or rotating disk electrode (RDE).

Tilt-back measuring arm, integrated drip pan.

Current measurement techniques

DC Direct Current NP Normal Pulse DP Differential Pulse SqW Square Wave (10 ... 2000 Hz) AC1

AC2

PSA Potentiometric Stripping Analysis (chronopotentiometry)

CCPSA PSA with Constant Current oxidation/reduction CV Cyclic Voltammetry (digital ramp) CVS Cyclic Voltammetric Stripping CPVS Cyclic Pulse Voltammetric Stripping (Chronoamperometry)

Subject to changes! The listed technical data apply to an ambient tempera-

ture of 25°C.

Phase-sensitive Alternating Current 1 (1 … 250 Hz)

Phase-sensitive Alternating Current 2 (1 … 250 Hz)

with chemical oxidation/reduction

harmonic

Potentiostat

Output voltage (AE)

Output current (AE)

Sweep voltage range

Voltage resolution

Input impedance(RE)

Input Bias Current (RE)

Noise typ. 200 pA Sweep rate

797 VA Computrace / Hardware-Manual 8.797.8001EN

± 12 V

± 80 mA

± 5 V

150 μV

R ≥ 1·10

± 5 pA

with voltage step 10 mV

CV,CVS: 0 … 36.7 V/s SQW, DC: 0 … 20 V/s DP, NP: 0 … 0.5 V/s AC1, AC2: 0 … 22 mV/s

4.1 Technical data

Pulse amplitudes

AC1, AC2: 1 mV … 1 V DP, NP: –1 … 1 V SQW: 0.15 mV … 1 V

Current measurement

Current ranges 10 nA … 10 mA in 7 ranges

Current resolution 0.2 % of the current range

Minimum current I

Maximum current I

30 fA

min

80 mA

max

Integration times 0.1 … 20 ms

Multi-Mode Electrode MME (working electrode WE)

Designation 6.1246.020

Electrode types DME (dropping mercury electrode)

HMDE (hanging mercury drop electrode) SMDE (static mercury drop electrode)

Drop surface

0.15 … 0.60 mm

(DME, HMDE and SMDE)

Glass capillary Standard capillary for polarography and stripping

voltammetry in alkaline solutions:

6.1226.030 (set of 10) internal diameter = 0.05 mm

Silanized capillary for stripping voltammetry in acidic solutions:

6.1226.050 (set of 10) internal diameter = 0.05 mm

Mercury reservoir

6 mL ≅ 81.2 g; sufficient for ca. 200'000 Hg drops

Mercury quality ultra pure mercury, min. 99.999%

Auxiliary power inert gas (generally nitrogen N

= 1 ± 0.2 bar

Rotating disk electrode RDE (working electrode WE)

Construction 6.1204.210 Drive shaft + screw-on

6.1204.XXX Electrode tips

Electrode tips 6.1204.110 glassy carbon (GC)

6.1204.120 platinum (Pt) unpolished

6.1204.130 silver (Ag)

6.1204.140 gold (Au) for Hg determination

6.1204.150 gold (Au) for As determination

6.1204.160 platinum (Pt) polished, for CVS

6.1204.170 platinum (Pt) polished, for CVS

6.1204.180 Ultra trace graphite (UT)

6.1204.190 Pt electrode tip (1 mm) for CVS, shaft made of glass

”5.0”, min 99.999%); p

Disk diameter

2.0 ± 0.1 mm (6.1204.150 / 6.1204.170 disk diameter 3 ± 0.1 mm) (6.1204.190 disk diameter 1 ± 0.02 mm)

Radial eccentricity ≤ 0.2 mm

797 VA Computrace / Hardware-Manual 8.797.8001EN

4 Appendix

Regeneration with 6.2802.000 Polishing kit

or with 6.2802.020 Trimming tool (only for

6.1204.180)

Rotational speed 200, 400, 600, ... , 3000 min

–1

Speed constancy ± 2 %

Reference electrode(RE)

Construction double-junction;

6.0728.0X0 Ag/AgCl Ref. system + 6.1245.010 Electrolyte vessel to be filled by user

Reference system 6.0728.030 LL-Ag/AgCl(KCl) Reference system

6.0728.020 Ag/AgCl/c(KCl) = 3 mol/L

6.0728.010 Ag/AgCl/dry (Option); can be filled with any electrolyte.

Diaphragm ceramic diaphragm; diameter = 3 mm

Auxiliary electrode(AE)

Pt auxiliary electrode 6.0343.000 Platinum electrode GC auxiliary electrode

(option)

6.1241.020 Electrode holder +

6.1247.000 Glassy carbon tip

Stirrer

Construction 6.1204.200 Material PET

–1

Rotational speed 200, 400, 600, ... , 3000 min Speed constancy ± 2 %

Measuring vessels

6.1415.210 standard measuring vessel made of lead-free borosilicate glass 3.3; working volume = 10 ... 90 mL

6.1415.250 measuring vessel made of lead-free borosilicate glass

3.3; working volume = 50 … 150 mL

6.1415.150 measuring vessel made of lead-free borosilicate glass

3.3 (option); working volume = 5 ... 70 mL

6.1418.220

measuring vessel made of lead-free borosilicate glass 3.3 with thermostat jacket (option); working volume = 12 ... 70 mL

6.1418.250 measuring vessel made of lead-free borosilicate glass

3.3 with thermostat jacket (option); working volume = 50 ... 150 mL

6.1450.210 measuring vessel made of PFA (option) working volume = 10 ... 90 mL

6.1456.210

measuring vessel made of lead-free borosilicate glass

3.3 for sample changer operation (option); working volume = 10 ... 90 mL

6.1457.210

measuring vessel made of lead-free borosilicate glass 3.3 with thermostat jacket for sample changer operation (option); working volume = 10 ... 90 mL

797 VA Computrace / Hardware-Manual 8.797.8001EN

4.1 Technical data

Dummy Cell

Use Checking of the 797 VA Computrace

Determination of the signal-to-noise ratio

Connections AE auxiliary electrode

RE reference electrode WE-L working electrode linear mode (RC element) WE-D working electrode differential mode (peak/wave)

Inert gas (in general nitrogen N

)

Use Operation of MME de-aeration of sample solution (Not

needed for electroplating bath analysis)

Purity min. 5.0 (99.999 %) Required pressure p = 1 ± 0.2 bar (this gas pressure results in a gas flow

rate of ca. 20 L/h)

Dosing devices (Option)

Type

800 Dosino (2.800.0010) + 807 Dosing unit (6.3032.XXX),

700 Dosino (2.700.0020) + 807 Dosing unit (6.3032.XXX),

685 Dosimat (2.685.0010) + 806 Exchange unit (6.3026.XXX) + Cable (6.2134.030)

805 Dosimat (2.805.0010) + 806 Exchange unit (6.3026.XXX)

connect via MSB 1…3 (or to a 846 Dosing Interface)

Number 1...3 (with a 846 Dosing Interface, 4 additional can be

connected)

Plug Mini-DIN

Manual operation Dispensing, filling, adjustment of feed and filling rate

MSB connections (MSB = Metrohm Serial Bus)

Dosing devices Connection of max. 3 Dosing devices (MSB1 to MSB3)

USB connections

USB Standard USB1.1

Connection computer With cable 6.2151.020

USB ports 2 USB downstream Ports (type A sockets), each

Remote connections

Remote Interface D-Sub, 25 pin remote interface to control sample

797 VA Computrace / Hardware-Manual 8.797.8001EN

to 797 VA Computrace. With a 846 Dosing Interface, four additional Dosing devices can be connected.

500 mA, for the connection of peripherals as printer,…

changer and rinsing equipment.

4 Appendix

Cable 6.2141.170 (option, for the 863 Compact Autosam-

pler)

6.2141.180 (option, for 838 Advanced Sample Processor)

Sample changer 863 Compact Autosampler (2.863.0020, option)

or 838 Advanced Sample Processor (2.838.0310, option)

Rinsing equipment 843 Pump Station

or 731 Relay Box (2.731.0010, option) with two 772 Pump units (2 x 2.772.0110, option) or two 823 Membrane Pump Units (2 x 2.823.0010, option), Adapter cable (6.2160.010) and Rinsing equipment (6.5323.010, Option).

Mains connection

Voltage 100...240 V

Frequency 50...60 Hz

Power consumption 120 W

Fuse 2 × 1.6 ATH (to be replaced by Metrohm Service only

using the same type). Additional electronic overload protection.

Safety specifications

Construction/testing

According to EN/IEC/UL 61010-1, CSA-C22.2 No. 61010-1 protection class 1

Safety directions The Instructions for Use include information and

warnings, which must be heeded by the user to assure safe operation of the instrument.

Electromagnetic compatibility (EMC)

Emitted interference Standards complied with:

- EN/IEC 61326-1

- EN 55022 / CISPR 22

- EN/IEC 61000-3-2

- EN/IEC 61000-3-3

Immunity to interference

Standards complied with:

- EN/IEC 61326-1

- EN/IEC 61000-4-2

- EN/IEC 61000-4-3

- EN/IEC 61000-4-4

- EN/IEC 61000-4-5

- EN/IEC 61000-4-6

- EN/IEC 61000-4-11

Ambient temperature

Nominal operating range 0…+45 °C

797 VA Computrace / Hardware-Manual 8.797.8001EN

4.1 Technical data

Storage, transport –40…+70 °C

Housing

Material of cover Polyurethane rigid foam (PUR) with fire protection for

fire class UL94VO, FCH-free

Material of base Steel, enameled

Material of measuring

Steel, enameled

head arm

Dimensions

Width 259 mm

Height 240mm (544/620 mm with cover raised)

Depth 530 mm

Weight 9.7 kg (excl. accessories)

797 VA Computrace / Hardware-Manual 8.797.8001EN

4 Appendix

4.2 Scope of delivery

Subject to changes! All dimensions are given in mm.

4.2.1 VA Computrace 2.797.0010

The 2.797.0010 VA Computrace System includes the following accessories:

Quant. Order No. Description

1 1.797.0010 797 VA Computrace Stand

Instrument without accessories

1 6.0343.000 Pt Auxiliary electrode

116

1 6.0728.020 Ag/AgCl reference system

with ceramic diaphragm

Ag/AgCl/c(KCl) = 3 mol/L

Together with the 6.1245.010 Electrolyte vessel forms a complete reference electrode (double-junction construction, assembly, see section

2.5.2).

The Ag/AgCl reference system is supplied with a screwed-on holder filled with c(KCl) = 3 mol/L.

1 6.1204.200 Stirrer

116

102

797 VA Computrace / Hardware-Manual 8.797.8001EN

4.2 Scope of delivery

Quant. Order No. Description

1 6.1226.030 Glass capillaries

for 6.1246.020 Multi-Mode Electrode

Set of 10 incl. two 4.420.2800 sealing rings

1 6.1226.050 Glass capillaries (silanized)

for 6.1246.020 Multi-mode electrode

Set of 10 incl. two 4.420.2800 sealing rings

1 6.1244.020 Drive belt

made of EPDM (ethylene propylene rubber), set of 3

Connection motor – drive shaft (6.1246.010 or

6.1204.210)

1 6.1245.010 Electrolyte vessel

with ceramic diaphragm

Together with the 6.0728.020 Ag/AgCl reference system forms a complete reference electrode (double-junction construction, assembly, see section

2.5.2)

116

B-NS 14/15

1 6.1246.020 Multi-Mode Electrode

incl. 2 O-rings NBR (nitril rubber)

Together with the 6.1226.030 glass capillary forms a complete working electrode.

1 6.1247.020 Sealing needle

for 6.1246.020 Multi-Mode Electrode

Set of 3

1 6.1415.210 Measuring vessel

borosilicate glass

Volume: 10 ... 90 mL

∅78

∅5

∅23

797 VA Computrace / Hardware-Manual 8.797.8001EN

4 Appendix

Quant. Order No. Description

7 6.1446.040 Dummy stopper

made of PVDF, with M6 thread

For closing the unused openings in the measuring vessel upper half

1 6.1801.080 PVC tubing

for supply of the inert gas

Length L = 4 m

21.5

∅4.9

4 6.1808.000 Tubing coupling

made of ETFE, with 2 M6 threads

For the connection of 2 lengths of tubing with thread M6 (e.g.

6.1805.XXX)

1 6.1817.000 Filling tubing, made of PVC

incl. 4.420.2860 Filling cone and

6.1809.000 Tubing coupling

For filling the MME with mercury.

1 6.1824.000 4-way microtip

made of PTFE

With 4 lengths of PTFE tubing with connection nipples with thread M6 for the attachment of 4 Dosing devices.

1 6.2122.0X0 Mains cable

to customer's specifications:

Cable socket

Type IEC 320/C 13 Type SEV 12 (CH…)

6.2122.020 Type IEC 320/C 13 Type CEE (7), VII (D…)

6.2122.040 Type CEE (22), V Type NEMA 5-15 (USA…)

6.2122.070

Cable plug

700

100

∅10

520

1 6.2301.100 Lead standard solution

(Pb2+) = 1.000 ± 0.003 g/L

plastic bottle, volume V = 50 mL

To perform the test methods.

1 6.2308.020 KCl electrolyte solution

c(KCl) = 3 mol/L plastic bottle, volume V = 250 mL

For filling the Ag/AgCl-reference-system 6.0728.020 and the electrolyte vessel 6.1245.010 for voltammetric trace analysis.

797 VA Computrace / Hardware-Manual 8.797.8001EN

4.2 Scope of delivery

18 76

Quant. Order No. Description

1 6.2406.000 Mercury drop catcher

silver wire in plastic bottle

For the destruction of mercury drops by amalgamation

∅32

100

1 6.2615.030 Electrode holder

For filling and storing the

6.1246.020 Multi-Mode Electrode

1 6.2703.000 Stand ring made of PVC

To hold the 6.1415.210 measuring vessel outside the 797 VA Computrace Stand

∅63

1 6.2709.080 Stopper

For closing the pipetting aperture of the 797 VA Computrace Stand

1 6.2711.030 Drip pan

made of PS (polystyrene)

For filling the Multi-Mode Electrode with mercury

1 6.2711.040 Drip pan

made of PS (polystyrene)

To be inserted in the 797 VA Computrace Stand

290

∅53.2

210

150

200

1 6.2739.000 Spanner

for screwing down plastic nipples

∅10∅8

797 VA Computrace / Hardware-Manual 8.797.8001EN

4 Appendix

Quant. Order No. Description

1 6.2816.020 Syringe

made of PP, with Luer connection

Volume V = 10 mL

For filling the MME

102

1 6.2816.030 Needle

for 6.2816.020 syringe

∅0.8

1 6.2151.020 USB Cable 797 – PC

For connection of the 797 VA Computrace Stand to the PC via USB

USB A – USB B (1.8 m)

1 6.6053.030 PC Software-CD «797 VA Computrace Software»

1 8.797.8001EN Hardware Manual (English)

Instructions for Use for 797 VA Computrace Stand

1 8.797.8027 Registration card (German/English)

for PC program «797 VA Computrace»

1 8.757.2003 "VA Application Notes" (English)

1 8.757.5003 Metrohm Monograph "Practical voltammetry" (English)

1 8.027.5003 Metrohm Monograph "Introduction to Polarography and Voltam-

metry“ (English)

1 8.797.8033 Software Manual (English)

Instructions for Use for PC program «797 VA Computrace»

1 8.110.8213 Software Manual (English)

Metrodata Autodatabase

797 VA Computrace / Hardware-Manual 8.797.8001EN

Metrohm 797VA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1.1 Instrument description

1 Introduction

1.2 Parts and controls

1.3 Information about the Instructions for Use

1.3.1 Organization

1.3.2 Notation and pictograms

1.4 Support documentation

1.4.1 Application-Bulletins

1.4.2 Application Notes

1.4.3 Monographs

1.4.4 Reprints

2 Installation

2.1 Setting up the instrument

2.1.1 Packaging

2.1.2 Check

2.1.3 Location

2.2 Installation of the 797 VA Computrace Stand

2.2.1 Mains cable and mains connection

2.2.2 Switching the instrument on/off

2.2.3 Connection to the PC

2.2.4 Equipping the measuring head

2.2.5 Inert gas connection

2.3 Multi-Mode Electrode (MME)

2.3.1 Construction and operating characteristics of the MME

2.3.2 Filling the MME with mercury

2.3.3 Mounting the capillary

2.3.4 Filling capillary without vacuum

2.3.5 Filling the capillary using vacuum

2.3.6 Storing the MME

2.3.7 Replenishing the mercury (without changing capillary)

2.3.8 Changing capillary

2.3.9 Cleaning the MME

2.4 Rotating disk electrode (RDE)

2.4.1 Construction and startup of the RDE

2.4.2 Regeneration of RDE

2.5 Reference electrode

2.5.1 Construction

2.5.2 Startup procedure

2.6 Auxiliary electrode

2.6.1 Construction

2.6.2 Startup procedure

2.7 Stirrer

2.8 Connection of Dosing devices

2.8.1 Electrical connection

2.8.2 Tubing connection

2.8.3 Change Dosing-/Exchange unit

2.9 Connection of 863 Compact Autosampler

2.9.1 Electrical connection

2.9.2 Tubing connections

2.9.3 Software settings

2.9.4 Operation of the 863 Compact Autosampler

2.10 Connection of 838 Advanced Sample Processor

2.10.1 General composition

2.10.2 System description for a combined system for Brightener and Suppressor

2.10.3 System description for Suppressor determination

2.10.4 System description for Brightener determination with MLAT

2.10.5 System description for Brightener determination with LAT

2.11 Control lines

2.12 Connection of peripherals

2.13 Communication diagrams for automation

2.13.1 Communication diagram VA

2.13.2 Communication diagram LAT

2.13.3 Communication diagram MLAT

2.13.4 Communication diagram DT

2.13.5 Communication diagram "RC Record response curve"

2.13.6 Communication diagram "RC Sample with response curve"

3 Safety

3.1 Electrical safety

3.2 Change fuses

3.3 Cabinet temperature

3.4 Safety considerations concerning mercury

3.4.1 Properties of mercury

3.4.2 Toxicity of mercury and its compounds

3.4.3 Handling of mercury

3.4.4 References dealing with mercury

4 Appendix