Metrohm 884 Professional VA Manual - Short Instructions
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Metrohm 884 Professional VA Manual - Short Instructions

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884 Professional VA
Manual – Short Instructions
8.884.8004EN / 2019-09-20

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Summary of Contents for Metrohm 884 Professional VA

  • Page 1 884 Professional VA Manual – Short Instructions 8.884.8004EN / 2019-09-20...
  • Page 3 Metrohm AG CH-9100 Herisau Switzerland Phone +41 71 353 85 85 Fax +41 71 353 89 01 info@metrohm.com www.metrohm.com 884 Professional VA Manual – Short Instructions 8.884.8004EN / 2019-09-20...
  • Page 4 Technical Communication Metrohm AG CH-9100 Herisau techcom@metrohm.com This documentation is protected by copyright. All rights reserved. This documentation has been prepared with great care. However, errors can never be entirely ruled out. Please send comments regarding possible errors to the address above.

  • Page 5: Table Of Contents

    Tubing connector (measuring head arm) ........ 25 SPE measuring head ............26 2.5.1 SPE measuring head overview ..........26 2.5.2 SPE measuring head connector plate and measuring head insert ..................27 2.5.3 Tubing connector (measuring head arm) ........ 30 ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 6 6 Troubleshooting List of faults ................ 98 6.1.1 General problems ..............98 6.1.2 884 Professional VA for VA trace analysis ....... 99 6.1.3 884 Professional VA for CVS ..........109 7 Appendix Tubing lengths in the measuring head arm ....111 "Status"...
  • Page 7 ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of contents Index ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 8 ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of figures Table of figures Figure 1 Front 884 Professional VA ............... 11 Figure 2 884 Professional VA rear ..............12 Figure 3 MME measuring head - Overview ............ 14 Figure 4 MME measuring head connector plate ..........15 Figure 5 MME measuring head insert ............
  • Page 9 Figure 72 Removing the measuring head ............94 Figure 73 Rear WASTE connector ..............94 Figure 74 Do not touch the drive disk ............. 95 Figure 75 Dummy cell test – Ideal curve progression ........97 ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 11: Introduction

    In addition to an introduction, safety instructions and an overview of the instrument, you will also find information about instal- ling, starting up and servicing the 884 Professional VA instrument. You can download the comprehensive manual as a PDF file from the Internet.

  • Page 12: Instrument Description

    The additives can be quantita- tively determined by means of CVS (Cyclic Voltammetric Stripping). The 884 Professional VA instrument is very compact in size and requires little space for operation. The measuring head can be removed from the instrument and put back in place again with a simple hand movement.

  • Page 13: Instrument Versions

    ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction The 884 Professional VA instrument must be started, operated and con- trolled via the viva computer software. The data transfer between the measuring instrument and the PC takes place via a USB connection. At the end of every determination, the data (voltammogram, results, etc.) is saved in a database.

  • Page 14: Intended Use

    ￭ This instrument is suitable for processing various chemicals and flammable samples. Therefore, the use of the 884 Professional VA requires the user to have basic knowledge and experience in handling toxic and caustic sub- stances. Knowledge regarding the application of fire prevention measures prescribed for laboratories is also mandatory.

  • Page 15: About The Documentation

    In those cases, the content displayed also applies the same to the other measuring heads. 1.5.2 Further information and literature You can find further information regarding the 884 Professional VA in the following publications: CVS tutorial (8.103.8010XX) ￭ VA tutorial (8.103.8033XX) ￭...

  • Page 16: References

    If the chapter 2.3.1 "MME measuring head overview" is referred to, for example, then the respective information for the RDE measuring head can be found under 2.4.1 and for the SPE measuring head under 2.5.1. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 17: Safety Instructions

    The electrical safety when working with the instrument is ensured as part of the international standard IEC 61010. WARNING Only personnel qualified by Metrohm are authorized to carry out service work on electronic components. WARNING Never open the housing of the instrument. The instrument could be damaged by this.

  • Page 18: Personnel Safety

    Wear protective glasses and work clothes suitable for laboratory work. WARNING Uncontrolled splashing of reagents Splashing reagents may result in injuries. Operate the 884 Professional VA only with the measuring head in place and the measuring head arm lowered. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 19: Metallic Liquid Mercury

    Damaged tubing ends lead to leakage. Appropriate tools can be used to loosen connections. Check the connections regularly for leakage. If the instrument is used mainly in unattended operation, then weekly inspections are manda- tory. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 20: Recycling And Disposal

    The MME pro (Multi-Mode Electrode pro) contains toxic mercury; never dispose of it in domestic waste. For more information on the recycling and disposing of mercury, observe the Mercury Handling Guidelines (8.000.5054XX). ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 21: Overview Of The Instrument

    Front 884 Professional VA "Status" LED "On" LED Continuously on: instrument ready for oper- Illuminated if the 884 Professional VA is con- ation. Blinking regularly: instrument operat- nected to the power grid. ing. Blinking pattern "LED on a long time - off a short time - on a long time - off a short time, etc.": Standby potential is being...

  • Page 22: Rear

    For positioning the drip pan. may be present (such as electrode mercury) in fully automated mode. Rear Figure 2 884 Professional VA rear Temperature sensor connector (Temp.) Type plates For connecting a temperature sensor of the With serial number. type Pt1000. 2 B sockets, 2 mm.
  • Page 23 "Controller" connector MSB connectors (MSB 1 to 4) For connecting to a PC with the viva com- Metrohm Serial Bus. For connecting dosing puter software installed. Mini DIN, 8-pin. devices (800 Dosino) and Remote Boxes. Mini DIN, 8-pin. Power socket ￭￭￭￭￭￭￭￭...

  • Page 24: Mme Measuring Head

    With openings for inserting electrodes and For connecting the MME measuring head to tubing connections (see figure 5, page 17). the connector plate of the measuring head arm (1- For connecting the electrodes and tubing (see figure 4, page 15). ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 25: Mme Measuring Head Connector Plate And Measuring Head Insert

    For connecting the inert gas supply (N For aspirating the measuring solution. Can Connected directly to the working electrode. be connected to one of the openings 24 - The tubing comes pre-installed. 27 (FEP tubing from 6.1829.070). ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 26 12 M6 threaded opening (TAP) With preinstalled tubing connection to With preinstalled tubing connection to opening 18 - gas outlet. threaded opening 17 - gas inlet to the tap- ping mechanism. 14 - 30: see next figure ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 27: Figure 5 Mme Measuring Head Insert

    (6.1824.000). tapping mechanism. 18 Opening 19 Opening With preinstalled tubing connection to For tubing connection to threaded opening threaded opening 11 (OUT) - gas outlet. 8 (PURGE) - gas inlet in the measuring solu- tion. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 28: Tubing Connector (Measuring Head Arm)

    TAP, PURGE and N via the measuring head arm. M6 threaded opening (2) UNF 10/32 threaded opening (SMP) For connecting tubing for adding solutions. For connecting a capillary for automated sample addition. ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 29 2 Overview of the instrument M6 threaded opening (1) M6 threaded opening (WASTE) For connecting tubing for adding solutions. For connecting tubing for aspirating the measuring solution. M6 threaded opening (OUT) For pressure compensation in the measuring vessel. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 30: Rde Measuring Head

    With openings for inserting electrodes and For connecting the RDE measuring head to tubing connections (see figure 9, page 23). the connector plate of the measuring head arm (1- For connecting the electrodes and tubing (see figure 8, page 21). ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 31: Rde Measuring Head Connector Plate And Measuring Head Insert

    M6 threaded opening (WASTE) With preinstalled stopper. Not applicable to For aspirating the measuring solution. Can CVS analyses and RDE applications in VA be connected to one of the openings 24 - trace analysis. 27 (FEP tubing from 6.1829.070). ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 32 For voltammetric ses. applications, not applicable to CVS analy- ses. 13 Guide roller 14 - 30: see next figure Transfers the rotary movement of the motor to the driving axle of the working electrode. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 33: Figure 9 Rde Measuring Head Insert

    Can be equipped with a four-way micro dos- threaded opening 12 (TAP) - gas inlet via the ing tip (6.1824.000). measuring solution for keeping out oxygen during the measurement. For voltammetric applications, not applicable to CVS analy- ses. ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 34 29 Opening for sensor For the automated sample addition. Must be For inserting a temperature sensor (Pt1000). connected to threaded opening 5 (SMP) (PEEK capillary 6.1831.020). 30 Opening For feeding through the temperature sensor cable from above. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 35: Tubing Connector (Measuring Head Arm)

    M6 threaded opening (1) M6 threaded opening (WASTE) For connecting tubing for adding solutions. For connecting tubing for aspirating the measuring solution. M6 threaded opening (OUT) For pressure compensation in the measuring vessel. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 36: Spe Measuring Head

    With openings for inserting electrodes and For connecting the SPE measuring head to tubing connections (see figure 13, page the connector plate of the measuring head 29). arm (1- For connecting the electrodes and tubing (see figure 12, page 27). ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 37: Spe Measuring Head Connector Plate And Measuring Head Insert

    M6 threaded opening (N M6 threaded opening (WASTE) With preinstalled stopper. Not applicable to For aspirating the measuring solution. Can SPE applications. be connected to one of the openings 21 - 24 (FEP tubing from 6.1829.070). ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 38 17 - gas outlet. threaded opening 16 - gas inlet via the mea- suring solution for keeping out oxygen dur- ing the measurement. For voltammetric applications, not applicable to CVS analy- ses. 13 - 27: see next figure ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 39: Figure 13 Spe Measuring Head Insert

    17 Opening 18 Opening With preinstalled tubing connection to For tubing connection to threaded opening threaded opening 11 (OUT) - gas outlet. 8 (PURGE) - gas inlet in the measuring solu- tion. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 40: Tubing Connector (Measuring Head Arm)

    Tubing connector (measuring head arm) Nipple (N M6 threaded opening (3) For connecting the inert gas supply. Is con- For connecting tubing for adding solutions. nected to threaded openings TAP, PURGE and N via the measuring head arm. ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 41 For connecting a capillary for automated sample addition. M6 threaded opening (1) M6 threaded opening (WASTE) For connecting tubing for adding solutions. For connecting tubing for aspirating the measuring solution. M6 threaded opening (OUT) For pressure compensation in the measuring vessel. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 42: Installation

    Equipping the MME measuring head CAUTION The measuring head insert (see figure 5, page 17) is made of PTFE. Do not use sharp objects around it to ensure the material is not damaged. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 43: Preparing The Mme Measuring Head

    3.2.1 Preparing the MME measuring head NOTICE For equipping, Metrohm recommends placing the MME measuring head in the measuring head holder and only then inserting it onto the measuring head arm. 1 Remove the stopper (3-5) from the pipetting opening to remove the measuring head cover.

  • Page 44: Figure 16 Removing The Measuring Head Cover

    Insert the PTFE tubing for adding gas to the solution (6.1829.030) ￭ through the opening (5-19). Pull the transparent inner tubing through as far as it will go. ￭ Ensure that the green kink protection is protecting the entire piece ￭ of tubing. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 45: Figure 17 Inserting The Gas Inlet

    ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 3 Installation Figure 17 Inserting the gas inlet Connect the tubing to the PURGE threaded opening (4-8) and ￭ tighten it hand-tight. Finally, tighten the tubing nipple using the wrench provided ￭ (6.2739.000). ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 46: Figure 18 Connecting The Gas Inlet

    2 wrenches (6.2739.000). In the process, ensure that the flexible shaft is not kinked. Figure 19 Screwing in the flexible shaft Insert the stirrer into the opening (5-15) and press it down as far ￭ as it will go. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 47: Figure 20 Inserting And Connecting The Stirrer

    Screw the clamping screw for the flexible shaft to the drive shaft ￭ using 2 wrenches (6.2739.000). In the process, ensure that the flexible shaft is not kinked. Figure 20 Inserting and connecting the stirrer ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 48: Preparing Electrodes And Inserting Them In The Mme Measuring Head

    Inserting the stopper 3.2.2 Preparing electrodes and inserting them in the MME measuring head The 884 Professional VA uses the 3-electrode principle. The following elec- trodes are used: Multi-Mode Electrode pro (MME pro) as the working electrode (WE) ￭ Reference electrode (RE) ￭...
  • Page 49 Place an empty measuring vessel in the holder (1-3). ￭ Carefully insert the working electrode into the opening (5-21) of ￭ the measuring head insert. The bottom of the capillary must not touch the measuring head while being inserted. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 50: Figure 22 Inserting The Working Electrode

    Observe the markings on the plugs, because the 3 cables must not be mixed up. Plug the electrode cable (4-7) with the WE marking on the plug onto the metal contact of the working electrode. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 51: Figure 23 Connecting The Working Electrode

    ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 3 Installation Figure 23 Connecting the working electrode ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 52: Figure 24 Connecting The Inert Gas Inlet

    Adjust the needle valve in accordance with the instructions in the Multi-Mode Electrode pro document (8.110.8018XX) and the Elec- trodes in Voltammetry multimedia guide (A.717.0003). 6 Testing the electrode function Test the electrode function in accordance with the instructions in the Multi-Mode Electrode pro document (8.110.8018XX). ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 53 4 Place the reference electrode in the filled electrolyte vessel and screw it in place. The electrolyte solution that is displaced in the electrolyte vessel is forced out of the deaeration openings. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 54: Figure 25 Assembling The Reference Electrode With The Electrolyte Vessel

    Observe the markings on the plugs, because the 3 cables must not be mixed up. Plug the electrode cable (4-7) with the RE marking on the plug onto the metal contact of the reference electrode. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 55: Figure 26 Connecting A Reference Electrode

    (6.1247.000): Together form the optionally available glassy carbon auxiliary electrode The Pt auxiliary electrode (6.0343.000) included in standard delivery can be inserted directly into the measuring head. The optionally available GC auxiliary electrode has to be put together first. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 56: Figure 27 Structure Of The Auxiliary Electrodes

    In the event the GC rod breaks, the remaining part in the holder can be removed by pulling out the retaining ring (27-6). Insert the glassy carbon rod (27-7) through the retaining ring (27-6) into the electrode holder (27-5) as far as it will go. ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 57 Observe the markings on the plugs, because the 3 cables must not be mixed up. Plug the electrode cable (4-7) with the AE marking on the plug onto the metal contact of the auxiliary electrode. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 58: Inserting The Mme Measuring Head

    Place the measuring head cover at an angle of approx. 45° in the guide bolt in the front part of the measuring head insert. Fold back the measuring head cover and gently push it in place. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 59: Figure 29 Installing The Measuring Head Cover

    Installing the measuring head cover The measuring head cover must snap into place with an audible click. 2 Inserting the stopper Insert the stopper (3-5) into the pipetting opening. Figure 30 Inserting the stopper in the pipetting opening ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 60: Figure 31 Do Not Touch The Drive Disk

    Use one hand to hold the measuring head arm on the rear and use the other hand to insert the measuring head into the connector plate of the measuring head arm. The measuring head must snap into place with an audible click. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 61: Connecting The Inert Gas Supply

    – For measurements in organic solvents, fill with the solvent being used. Screw the gas washing glass back onto the measuring head arm. ￭ ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 62: Figure 33 Gas Washing Glass

    2 Connecting the inert gas inlet Connect one end of the PVC tubing (6.1801.080) on the N nip- ￭ ple of the 884 Professional VA. Connect the other end of the PVC tubing (6.1801.080) to the ￭ inert gas bottle connection.

  • Page 63: Equipping The Rde Measuring Head

    3.3.1 Preparing the RDE measuring head NOTICE For equipping, Metrohm recommends placing the RDE measuring head in the measuring head holder and only then inserting it onto the mea- suring head arm. 1 Remove the stopper (7-5) from the pipetting opening to remove the measuring head cover.

  • Page 64: Figure 36 Removing The Measuring Head Cover

    Insert the PTFE tubing for adding gas to the solution (6.1829.030) ￭ through the opening . Pull the transparent inner tubing through as far as it will go. ￭ Ensure that the green kink protection is protecting the entire piece ￭ of tubing. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 65: Figure 37 Inserting The Gas Inlet

    ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 3 Installation Figure 37 Inserting the gas inlet Connect the tubing to the PURGE threaded opening (4-8) and ￭ tighten it hand-tight. Finally, tighten the tubing nipple using the wrench provided ￭ (6.2739.000). ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 66: Preparing Electrodes And Inserting Them In The Rde Measuring Head

    Connecting the gas inlet 3.3.2 Preparing electrodes and inserting them in the RDE measuring head The 884 Professional VA uses the potentiostatic three-electrode principle. The following electrodes are used: Rotating disk electrode (RDE) as working electrode (WE) ￭ Reference electrode (RE) ￭...

  • Page 67: Figure 39 Removing The Protective Cap From The Electrode Tip

    Insert the working electrode into the opening (9-21) of the measur- ing head insert. Make sure that the pin on the lower part of the driving axle is posi- tioned in the opening (9-15) of the measuring head insert. Figure 41 Working electrode, installed ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 68: Figure 42 Fastening The Drive Belt

    (tubing, cables, etc.). 5 Connecting the working electrode CAUTION The electrode cables for the reference, working and auxiliary elec- trode look identical. Observe the markings on the plugs, because the 3 cables must not be mixed up. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 69: Figure 43 Connecting The Working Electrode

    Preparing and inserting the reference electrode Proceed as follows: 1 Remove the reference electrode from the storage vessel. The reference electrode that is part of the accessories is already filled with reference electrolyte (c(KCl) = 3 mol/L). ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 70: Figure 44 Assembling The Reference Electrode With The Electrolyte Vessel

    Figure 44 Assembling the reference electrode with the electrolyte vessel 5 Rinse the installed reference electrode with ultrapure water. 6 Insert the installed reference electrode into the opening (9-20) of the measuring head insert. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 71: Figure 45 Connecting A Reference Electrode

    Plug the electrode cable (8-7) with the RE marking on the plug onto the metal contact of the reference electrode. Figure 45 Connecting a reference electrode 3.3.2.3 Auxiliary electrode (AE) The auxiliary electrode (e.g. 6.0343.100) can be placed directly in the measuring head. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 72: Figure 46 Connecting The Auxiliary Electrode

    Observe the markings on the plugs, because the 3 cables must not be mixed up. Plug the electrode cable (8-7) with the AE marking on the plug onto the metal contact of the auxiliary electrode. Figure 46 Connecting the auxiliary electrode ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 73: Inserting The Rde Measuring Head

    Fold back the measuring head cover and gently push it in place. Figure 47 Installing the measuring head cover The measuring head cover must snap into place with an audible click. 2 Inserting the stopper Insert the stopper (3-5) into the pipetting opening. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 74: Figure 48 Inserting The Stopper In The Pipetting Opening

    Make sure that your fingers do not get caught between the mea- suring head arm and the instrument housing. CAUTION Do not apply pressure to the drive disk on the connector plate of the measuring head arm. Otherwise, the stirrer motor may be damaged. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 75: Connecting The Inert Gas Supply

    Connecting the inert gas supply NOTICE Only connect the inert gas supply if the RDE measuring head is used for VA trace analysis. If the RDE measuring head is used for CVS analysis, then no inert gas supply is necessary. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 76: Figure 51 Gas Washing Glass

    – For measurements in organic solvents, fill with the solvent being used. Screw the gas washing glass back onto the measuring head arm. ￭ Figure 51 Gas washing glass ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 77: Equipping The Spe Measuring Head

    3.4.1 Preparing the SPE measuring head NOTICE For equipping, Metrohm recommends placing the SPE measuring head in the measuring head holder and only then inserting it onto the mea- suring head arm. 1 Remove the stopper (11-5) from the pipetting opening to remove the measuring head cover.

  • Page 78: Figure 53 Removing The Stopper From The Pipetting Opening

    Insert the PTFE tubing for adding gas to the solution (6.1829.030) ￭ through the opening (13-18). Pull the transparent inner tubing through as far as it will go. ￭ Ensure that the green kink protection is protecting the entire piece ￭ of tubing. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 79: Figure 55 Inserting The Gas Inlet

    ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 3 Installation Figure 55 Inserting the gas inlet Connect the tubing to the PURGE threaded opening (12-8) and ￭ tighten it hand-tight. Finally, tighten the tubing nipple using the wrench provided ￭ (6.2739.000). ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 80: Figure 56 Connecting The Gas Inlet

    2 wrenches (6.2739.000). In the process, ensure that the flexible shaft is not kinked. Figure 57 Screwing in the flexible shaft Insert the stirrer into the opening (13-14) and press it down as far ￭ as it will go. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 81: Figure 58 Inserting And Connecting The Stirrer

    Screw the clamping screw for the flexible shaft to the drive shaft ￭ using 2 wrenches (6.2739.000). In the process, ensure that the flexible shaft is not kinked. Figure 58 Inserting and connecting the stirrer ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 82: Preparing The Electrode And Inserting It In The Spe Measuring Head

    Inserting the stopper 3.4.2 Preparing the electrode and inserting it in the SPE measuring head The 884 Professional VA uses the 3-electrode principle. The following elec- trodes are located on the screen-printed electrode (SPE): Working electrode (WE) ￭ Reference electrode (RE) ￭...
  • Page 83 – Insert the electrode in the electrode shaft – Tighten the nut 2 Inserting the electrode holder in the measuring head insert Insert the electrode holder with the electrode from above into the opening for the electrode (13-19). ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 84: Figure 60 Inserting The Electrode Holder

    ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 3.4 Equipping the SPE measuring head Figure 60 Inserting the electrode holder 3 Align the printed side of the electrode with the stirrer. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 85: Figure 61 Aligning The Electrode

    Observe the markings on the plugs. The 3 cables must not be mixed up. 1 Connecting the working electrode Plug the electrode cable (12-7) with the WE marking on the plug onto the corresponding metal contact WE of the electrode shaft. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 86: Figure 62 Connecting The Working Electrode

    3.4 Equipping the SPE measuring head Figure 62 Connecting the working electrode 2 Connecting a reference electrode Plug the electrode cable (12-7) with the RE marking on the plug onto the corresponding metal contact RE of the electrode shaft. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 87: Figure 63 Connecting A Reference Electrode

    ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 3 Installation Figure 63 Connecting a reference electrode 3 Connecting the auxiliary electrode Plug the electrode cable (12-7) with the AE marking on the plug onto the corresponding metal contact AE of the electrode shaft. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 88: Inserting The Spe Measuring Head

    Place the measuring head cover at an angle of approx. 45° in the guide bolt in the front part of the measuring head insert. Fold back the measuring head cover and gently push it in place. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 89: Figure 65 Installing The Measuring Head Cover

    Installing the measuring head cover The measuring head cover must snap into place with an audible click. 2 Inserting the stopper Insert the stopper (3-5) into the pipetting opening. Figure 66 Inserting the stopper in the pipetting opening ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 90: Figure 67 Do Not Touch The Drive Disk

    Use one hand to hold the measuring head arm on the rear and use the other hand to insert the measuring head into the connector plate of the measuring head arm. The measuring head must snap into place with an audible click. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 91: Connecting The Inert Gas Supply

    – For measurements in organic solvents, fill with the solvent being used. Screw the gas washing glass back onto the measuring head arm. ￭ ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 92: Figure 69 Gas Washing Glass

    2 Connecting the inert gas inlet Connect one end of the PVC tubing (6.1801.080) on the N nip- ￭ ple of the 884 Professional VA. Connect the other end of the PVC tubing (6.1801.080) to the ￭ inert gas bottle connection.

  • Page 93: Connecting Instruments Electrically

    Unplug the power plug immediately if you suspect that moisture has ￭ gotten inside the instrument. Only personnel who have been issued Metrohm qualifications may ￭ perform service and repair work on electrical and electronic parts. Connecting the power cord...

  • Page 94: Connecting The 884 Professional Va

    ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 3.5 Connecting instruments electrically 3.5.2 Connecting the 884 Professional VA The 884 Professional VA is connected to the PC with the supplied control- ler cable. Connecting the PC Proceed as follows: 1 Connect the controller cable (6.2151.000) to the "Controller" con- nector of the 884 Professional VA.

  • Page 95: Connecting An 800 Dosino

    You can connect up to 4 dosing devices of the type 800 Dosino directly to the 884 Professional VA. As an alternative, you can connect the dosing devices via an 846 Dosing Interface, a sample changer or any other sup- ported instrument that has MSB outputs.

  • Page 96: Figure 71 Connecting A Dosing Device To An Msb Socket

    Connecting an 800 Dosino with dosing unit directly to the 884 Professional VA Proceed as follows: 1 Connect the connection cable of the 800 Dosino to one of the 4 MSB connectors (2-8) of the 884 Professional VA. The following dialog window is displayed: 2 Confirm with OK. ￭￭￭￭￭￭￭￭...
  • Page 97 Initializing a dosing unit in viva Proceed as follows: 1 Select the 884 Professional VA in the device table of the Configura- tion section of the program. 2 In the device table, click on the Edit button and select Initialize.
  • Page 98 Diameter to the actual installation. This ensures that functions such as Prepare or Empty work properly in viva. The lengths and diameters of the tubing connections incorporated in the measur- ing head arm can be found in the appendix of the detailed man- ual. ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 99 5 Click on Yes if you are using the already configured dosing unit. The dosing unit will be automatically displayed in the Dosing units subwindow of the Configuration program part. NOTICE Check the Tubing parameters and adapt them to the actual installation, if necessary. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 100: Start-Up

    The 884 Professional VA is operated exclusively via the viva computer software. You can find information on operating viva in the online help and in the VA and CVS tutorials. Proceed as follows for the initial start-up of the 884 Professional VA: Preparing the system for starting up WARNING Uncontrolled splashing of reagents Splashing reagents may result in injuries.
  • Page 101 Calibrator of the detailed manual. In viva, proceed as follows: 1 Select the 884 Professional VA in the device table of the Configura- tion section of the program. 2 In the device table, click on the Edit button and select Properties..
  • Page 102 The calibration certificate is available online. Go to http:// www.metrohm.com/en/support-and-service/certificate-finder enter the serial number of the calibrator and download the certifi- cate. 5 If required, adjust the settings on the Calibrator tab (e.g. Message or Action). ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 103: Operation And Maintenance

    1 Tilt the measuring head arm up. 2 Hold the measuring head with both hands, push the metal clip on the bottom of the measuring head arm upwards and, at the same time, pull the measuring head away. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 104: Figure 72 Removing The Measuring Head

    When using a Multi-Mode Electrode pro along with additional auto- mated aspiration of the measuring solution, watch for traces of mer- cury in the indicated connector (WASTE) when removing the MME measuring head. Remove any traces using a mercury drop catcher (6.2406.000). ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 105: Figure 74 Do Not Touch The Drive Disk

    If the measuring head arm is folded down without due care, this may result in injuries to the hands. Make sure that your fingers do not get caught between the mea- suring head arm and the instrument housing. Lower the measuring head arm again. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 106: Performing A Dummy Cell Test

    The curve must be linear. ￭ At –2.0 V, the current should be –1.67 mA ± 0.33 mA. ￭ At +2.0 V, the current should be +1.67 mA ± 0.33 mA. ￭ ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 107: Figure 75 Dummy Cell Test - Ideal Curve Progression

    5 Operation and maintenance Figure 75 Dummy cell test – Ideal curve progression 5 If the resulting curve is not consistent with this representation and the problems with the determinations persist, contact the local Metrohm Service. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 108: Troubleshooting

    Check the tubing connections and the four- automatically: Tubing con- way micro dosing tip and replace if necessary. nections are not sealed or the 4-way micro dosing tip for adding standard solu- tions is not immersed in the measuring solution. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 109: 884 Professional Va For Va Trace Analysis

    Apply fresh solution; use water from a differ- tions in use (water, electro- ent source. lyte, VMS, etc.) has become contaminated. 6.1.2 884 Professional VA for VA trace analysis Problem Cause Remedy A peak is not found The peak is not within the...
  • Page 110 This can head. allow nitrogen to escape at the connection. The seals at the transitions Contact Metrohm Service for how to proceed. are too old. Contacts for the SPE Repeated penetration of Replace the electrode holder. are corroded.
  • Page 111 Increase the voltage step time in the voltam- metry command on the Sweep tab. quickly (with DME). Curves have a large The electrode surface is Check the deposition potential and time and amount of noise overloaded. reduce them if necessary. (with HMDE). ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 112 If the second peak became higher, the second element is present. Try out different electrolytes (e.g. substan- ￭ ces acting as complexing agents). Optimize the method parameters. ￭ ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 113 The supporting ring has Loosen the nut. Reposition the supporting rotated. ring. Align the slit in the supporting ring with the slit in the silicone seal. ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 114 Shorten the deposition time in the voltam- ￭ metry command under Potentiostatic pretreatment. Carry out the determination using polarog- ￭ raphy at the DME instead of stripping vol- tammetry. Use less of the sample amount or dilute the ￭ sample. ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 115 The incorrect peak has Carry out spiking with a standard solution ￭ been evaluated. to check whether the correct peak has been evaluated. Enter the characteristic potential in viva ￭ again and recalculate the results. ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 116 The silicone seal is defec- Silicone seals are consumables. The sharp tive. edges of SPEs can damage silicone seals. Metrohm recommends replacing the silicone seal after using 25 electrodes. Dry the electrode holder with a cloth. The supporting ring is The supporting ring deforms with time.
  • Page 117 (see the Multi-Mode Electrode pro docu- ment (8.110.8018XX)). The tapping mechanism on Check the positioning of the capillary in the ￭ the VA stand base is not MME pro. The capillary has to be centered functioning correctly. in the retaining screw. ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 118 The capillary and/or needle is defective: ￭ Replace the capillary and needle. If neces- sary, clean the MME pro (see the Multi- Mode Electrode pro document (8.110.8018XX). The tapping mechanism is not functioning ￭ correctly: Check the tapping of the drops. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 119: 884 Professional Va For Cvs

    ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 6 Troubleshooting 6.1.3 884 Professional VA for CVS Problem Cause Remedy Conditioning takes a The reference electrode has After maintenance of the reference electrode, long time. not yet reached equili- wait for at least 20 min before starting a mea- brium.
  • Page 120 The concentration of the Add a larger volume or use the RC calibration standard solution or the technique instead of DT. sample is too low. ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 121: Appendix

    A standby potential is being applied to the "LED on a long electrodes. Do not remove the measuring head time - off a short or the electrode cables in this instrument status. time - on a long time - off a short time…" ￭￭￭￭￭￭￭￭ 884 Professional VA...

  • Page 122: Accessories

    The PDF file with the accessories data is created. NOTICE Once you have received your new product, we recommend download- ing the accessories list from the Internet, printing it out and keeping it together with the manual for reference purposes. ￭￭￭￭￭￭￭￭ 884 Professional VA...
  • Page 123 800 Dosino Connect (electrically) ... 86 Connect (electrically) ... 84 Parts ........20 Initialize ......84 See also "RDE measuring head" 884 Professional VA Maintenance ...... 93 ........... 20 Troubleshooting ....98 Start-up ......90 RDE measuring head connector Instrument status ....111...

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