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3.3 Multi-mode electrode (MME)

757 VA Computrace – Hardware

3.3

Multi-mode electrode (MME)

The multi-mode electrode combines the most important polarographic and volt-

ammetric 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 sev-

eral drops are needed (renewal as with the DME).

3.3.1

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

flows through the glass capillary

forming a drop at its

end. The mercury flow is controlled by the sealing needle

, which can be raised

or 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

Figs. 7

and

. After valve

(inert gas supply) is opened, the mercury in the reservoir

is pressurized. In

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

onto the capillary

opening of the glass capillary

thus preventing the outflow of mercury. Switching

the valve

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

inert gas pressure in the mercury reservoir

presses the sealing needle

fixed

to the PTFE membrane of the slotted screw

upwards and the mercury can now

flow out. The tapping mechanism of the DME and SMDE is triggered by brief open-

ing 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 suf-

fices for around 200'000 drops.

Содержание 757 VA Computrace

Страница 1: ...757 VA Computrace METROHM Ltd CH 9101 Herisau Hardware Manual 8 757 1013 ...

Страница 2: ...CH 9101 Herisau Schweiz Internet www metrohm com E Mail info metrohm ch 757 VA Computrace Hardware Manual 8 757 1013 14 09 2001 dö ...

Страница 3: ...g head 16 3 2 5 Inert gas connection 19 3 3 Multi mode electrode MME 21 3 3 1 Construction and operating characteristics of the MME 21 3 3 2 Filling the MME with mercury 23 3 3 3 Mounting the capillary 24 3 3 4 Filling the capillary without vacuum 24 3 3 5 Filling the capillary using vacuum 26 3 3 6 Storing the MME 30 3 3 7 Replenishing the mercury without changing capillary 30 3 3 8 Changing the ...

Страница 4: ...d system validation 73 6 6 Index 74 List of figures Fig 1 Front of the 757 VA Computrace Stand 8 Fig 2 Rear of the 757 VA Computrace Stand 9 Fig 3 Right side view of the 757 VA Computrace Stand 10 Fig 4 Left side view of the 757 VA Computrace Stand 10 Fig 5 Connection to PC 15 Fig 6 Measuring head arm 17 Fig 7 Scheme showing the inert gas connections 20 Fig 8 Multi mode electrode 22 Fig 9 Adding t...

Страница 5: ...ctrode DME SMDE and the stationary hanging mercury drop electrode HMDE in a sin gle construction The rotating disk electrode RDE can also be used in the stand The parameters necessary for the VA measurement are sent from the PC to the VA Computrace Interface via USB connection The data acquisition at the 757 VA Computrace Stand is started and controlled by the VA Computrace Interface which receive...

Страница 6: ...on and technical specifications of these instruments The Instructions for Use are divided into the following 6 sec tions Section 1 Introduction Section 2 Parts and controls Numbers and designations of the parts and controls Section 3 Installation Installation of 757 VA Computrace Stand Installation of working reference and auxiliary electrodes Attachment of 765 Dosimats Attachment of the 813 Compa...

Страница 7: ...57 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 cor rectly Caution This symbol marks important information First read the associ ated directions before you con tinue Comment Th...

Страница 8: ...phic 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 anti mony bismuth and iron copper vanadium 76 Polarographic determination of nitrilotriacetic acid NTA and ethylened...

Страница 9: ...neously 192 Polarographic and stripping voltammetric determination of thiourea in the lower ppm and ppb range 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 deter...

Страница 10: ...s and sample preparation of pola rography 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 Cy...

Страница 11: ...ntrols In this section you will find the numbers and designations of the parts and controls of the 757 VA Computrace Stand The numbering applies throughout the instructions for use i e bold numbers in the text e g 15 refer to the parts and controls illustrated here ...

Страница 12: ... lamp lit up when instrument switched on 2 Stopper 6 2709 080 to close the pipetting opening 6 Measuring vessel when measuring head arm is fully raised the measuring vessel can be pulled forward out of the holder 3 3 Holder for measuring vessel 7 Drip pan 6 2711 040 4 Gas wash bottle 6 2405 030 for inert gas supply filling with dist water see section 3 2 5 ...

Страница 13: ...f instrument the pilot lamp 5 is lit up when the instrument is on 9 Connection for optional waste solution lead off 13 Mains connection plug mains connection see section 3 2 1 10 Connection for inert gas supply required pressure p 1 0 2 bar 14 Connection to VA Com putrace Interface connection socket for 6 2135 010 cable leading to the 6 2155 000 VA Computrace Interface see section 3 2 3 11 Serial ...

Страница 14: ...19 20 21 22 23 24 25 22 26 27 28 4 29 30 26 31 32 33 Fig 3 Right side view of the 757 VA Computrace Stand fully equipped 50 49 48 47 46 31 28 42 39 25 41 40 17 2 39 19 20 38 16 37 36 35 34 45 44 43 Fig 4 Left side view of the 757 VA Computrace Stand fully equipped ...

Страница 15: ...rrer tip 42 25 PTFE tube 6 1819 000 attached 26 4 way microtip 6 1824 000 for delivery of solutions with 4 lengths of PTFE tubing with connecting nipples for 765 Dosimat 27 Electrode cable RE connection for reference electrode 22 28 Drive belt 6 1244 020 connection between drive wheel 31 and drive shaft 24 29 PTFE tube 4 647 1350 for inert gas delivery to gas wash bottle 4 attached 30 FEP tubing 6...

Страница 16: ...solution attached 45 PTFE tube 6 1819 010 for optional siphoning off the waste solution from gas wash bottle 44 attached 46 Dummy cell connection WE D differential mode simulation peak wave 47 Dummy cell connection WE L linear mode simulation RC element 48 Dummy cell connection RE 49 Dummy cell connection AE 50 Slotted screw for controlling the tapping power in the DME case Note The factory settin...

Страница 17: ...and embedded in blue plastic film The instrument itself is packed in an evacuated polyethylene bag As only these special packaging guarantees indemnified transport of the instru ment it is essential you store it in a safe place 3 1 2 Check After receipt immediately check whether the shipment is complete and has arrived without damage compare with delivery note and list of accessories in sections 6...

Страница 18: ...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 an earthing pin If a different plug has to be fitted the yellow green lead IEC standard must be connected to protec tive earth protection class...

Страница 19: ...e The software package will be installed in the desired directory the default di rectory is Programs Metrohm 757 VA Computrace Restart the PC 2 Connection of the VA Computrace Interface Connect 6 2155 000 VA Computrace Interface to connection 14 PC Interface of the 757 VA Computrace using the 6 2135 010 cable and switch on 757 VA Computrace Stand see Fig 5 Connect VA Computrace Interface to the 6 ...

Страница 20: ...ning 53 3 Insert 4 way microtip option The 6 1824 000 4 way microtip has to be installed if 765 Dosimats are used for automatic solution addition Proceed as follows Remove stopper from nipple 23 and insert 4 way microtip 26 into nipple 23 as far as it will go Tighten nipple 23 using a 6 2739 010 Wrench until the 4 way microtip 26 can no longer move Pull the 4 lengths of PTFE tubing of the 4 way mi...

Страница 21: ...dummy stopper 21 6 1446 040 58 Opening for reference electrode 22 6 0728 020 Ag AgCl reference system and 6 1245 010 Electrolyte vessel 59 Threaded opening for nipple 23 6 2730 030 with dummy stopper or 4 way microtip 26 6 1824 000 60 Opening in operation with MME for stirrer comprising drive shaft 24 6 1246 010 and stirrer tip 42 6 1204 090 in operation with RDE for rotating disk electrode option...

Страница 22: ... side in the latter position it may become kinked and damaged when cover 1 is closed 7 Install MME or dummy stopper in operation with MME Carefully insert multi mode electrode 17 6 1246 020 in opening 55 the underside of the capillary must not touch the measuring head during in sertion and push in as far as it will go Screw FEP tubing 30 6 1805 180 for inert gas supply into connection 72 of the MM...

Страница 23: ...tablished as follows 1 Fill gas wash bottle Unscrew gas wash bottle 4 from measuring head arm 19 Fill gas wash bottle 4 half full with dist H2O for long term measurements with supporting electrolytes such as HAc buffer or NH3 buffer fill with supporting electrolyte for measurements in organic solvents fill with the used solvent Screw gas wash bottle 4 back on measuring head arm 19 2 Connect inert ...

Страница 24: ...ert gas flow for deaeration see also Fig 3 Note The factory setting of ca 20 L h should not be changed without good reason 50 Slotted screw for controlling the tapping power in the DME case see also Fig 4 Note The factory setting should not be changed without good reason 72 Connection for inert gas supply of the MME for raising and lowering the sealing needle in the MME see also section 3 3 1 and ...

Страница 25: ... its end The mercury flow is controlled by the sealing needle 76 which can be raised or 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 Figs 7 and 8 After valve V1 inert gas supply is opened the mercury in the reservoir 82 is pr...

Страница 26: ...n spring 76 Sealing needle 6 1247 020 77 Screw thread for slotted screw 75 78 Unused connection 79 Screw thread for slotted screw 80 80 Slotted screw 4 420 2960 for replenishing the mercury with capillary fitted 81 Electrical contact pin for mercury 82 Mercury reservoir 83 Screw thread for retaining nut 87 84 Insert ring 4 420 3011 85 Sealing ring 4 420 2800 made of silicone rubber 86 Locking ring...

Страница 27: ... screw 75 this gray PVC ring is needed only to remove the slotted screws 75 or 80 see section 3 3 7 and section 3 3 9 Turn slotted screw 75 in or out of the screw thread 77 using a suitable coin until the contact surface of the black O ring at the Plexiglas wall thin black stripe is just visible below the metal thread 77 Remove the plastic cap used as a transport safeguard from the retaining nut 8...

Страница 28: ... Insert capillary Cut open plastic package containing the glass capillary 88 on the side of the large capillary opening using scissors do not tear open leave capil lary in the package Insert glass capillary 88 directly from its protective plastic package through the retaining nut 87 into the sealing ring 85 and push in as far as it will go 3 Tighten retaining nut Firmly tighten retaining nut 87 by...

Страница 29: ...tart the VA Computrace program and click on or MAIN WINDOW Utility Computrace control to open the COMPUTRACE CONTROL window Then switch on the inert gas supply to the 757 VA Computrace Stand by clicking on DME This pressurizes the multi mode electrode 17 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...

Страница 30: ... available To fill the mounted glass capillary 88 section 3 3 3 with Hg with vacuum proceed as follows 1 Set up filling station All actions involving the electrode and the mercury vessels must be performed in or over the drip pan 92 supplied see Fig 10 The MME 17 is placed in the electrode holder 93 for filling 2 Connection for vacuum pump For filling the capillary 88 the filling tubing 94 is requ...

Страница 31: ...ig 11 Filling the capillary 17 Multi mode electrode 6 1246 0020 94 Filling tubing 6 1817 000 88 Glass capillary 6 1226 030 95 Filling cone 4 420 2860 part of the filling tubing 94 92 Drip pan 6 2711 030 96 Gas wash bottle 93 Electrode holder 6 2615 030 97 Tubing coupling 6 1809 000 part of the filling tubing 94 Vacuum release tap Pump Vacuum Vacuum ...

Страница 32: ...cked into the filling tubing 94 Disconnect filling tubing 94 with filling cone 95 from glass capillary 88 Place multi mode electrode 17 in a horizontal position in the electrode holder 93 see Fig 11 3 From now on the MME must be left in this position until it is installed in the stand 8 Install multi mode electrode in 757 VA Computrace Stand With measuring head arm 19 tilted back push empty measur...

Страница 33: ...11 Adjusting the sealing needle 76 Turn slotted screw 75 using a suitable coin slowly in a clockwise direction until the mercury flow stops Open slotted screw 75 slightly in an anticlockwise direction until the mercury flow restarts Gently tap the MME with your finger and turn the slotted screw 75 very slowly clockwise until the mercury flow just stops The tapping action is used to knock off the m...

Страница 34: ...8 from the MME Disconnect electrode cable 16 from the MME Take multi mode electrode 17 out of the measuring head 20 and tap the MME gently to knock off any mercury drops on the glass capillary into the measuring vessel Place multi mode electrode 17 horizontally in the electrode holder 93 see Fig 11 3 The slotted screw 80 is now at the top 2 Replenish mercury Unscrew slotted screw 80 using a suitab...

Страница 35: ...w the metal thread 77 3 Dismantle old capillary Position multi mode electrode 17 vertically in the electrode holder 93 see Fig 11 1 Undo retaining nut 87 completely by turning anticlockwise and lift up until the lower part of the glass capillary 88 with the wide opening is visible Gently tap the glass capillary 88 to knock off any residual mercury in the wide opening into the MME Press the retaini...

Страница 36: ...ing so gently tap the glass capillary 88 and the MME to ensure that all mercury flows out of the MME 3 Dismantle MME Unscrew retaining nut 87 Take glass capillary 88 out of opening 83 the sealing ring 85 and the locking ring 86 are removed at the same time Remove these two parts from the glass capillary 88 Remove insert ring 84 from the MME Unscrew slotted screw 75 with a suitable coin in an antic...

Страница 37: ...nt assembly of the MME Two new sealing rings 85 are enclosed in the package with the 6 1226 030 glass capillar ies 8 Reassemble MME Screw slotted screw 80 using a suitable coin flush into screw thread 79 Do not turn so tightly that the cemented in steel threaded ring 79 becomes loose and hence jeopardizes the tightness and safety of the MME Using a suitable coin screw slotted screw 75 into the scr...

Страница 38: ...e for installing the RDE in the measuring head arm of the 757 VA Computrace Stand is described in detail in section 3 2 4 The fully equipped meas uring head arm with the RDE is illustrated in Fig 12 3 4 2 Regenerating the 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 The surface of the 6 1...

Страница 39: ... arm carrier plate with permanently at tached measuring head raisable 38 FEP tubing 6 1805 180 20 Measuring head measuring vessel upper half made of PTFE with openings for electrodes stirrer gas and liquid supply lines 39 Auxiliary electrode details see section 3 6 28 Drive belt 6 1244 020 connection between drive wheel 31 and drive shaft 100 98 Stopper 6 2709 040 for closing the MME opening and t...

Страница 40: ...tion 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 Fig 13 22 102 109 110 111 101 103 104 105 106 107 108 Fig 13 Construction of the reference electrode 22 Reference electrode 101 Reference system ...

Страница 41: ...omposition depends on the analyses to be per formed aqueous or non aqueous solution composition of the supporting electrolyte etc If you use the same solution for the bridge electrolyte and the internal electrolyte single junction operation the inner diaphragm 108 can be omitted to reduce the electrical resistance Unscrew diaphragm support 107 with diaphragm 108 from the reference system 101 3 Scr...

Страница 42: ...ion must first be assembled 1 1 Assembly of the GC auxiliary electrode Insert glassy carbon tip 117 through the locking ring 116 into the elec trode holder 115 as far as it will go 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 ...

Страница 43: ...tirrer Screw stirrer tip 42 firmly to drive shaft 24 2 Insert stirrer in 757 VA Computrace Stand and connect Insert complete stirrer in opening 60 of the measuring head 20 as far as it will go see Fig 6 Stretch drive belt 28 between drive wheel 31 and drive shaft 24 of the stirrer see Fig 6 39 Auxiliary electrode 112 Electrical connection for cable AE 113 Pt Auxiliary electrode 6 0343 000 114 Pt t...

Страница 44: ...additions in the µL range standard additions solutions a burette volume of 10 mL or higher is recom mended for additions in the mL range auxiliary solutions This section describes the connection procedure further details on the 765 Dosimat and the various Exchange units can be found in the 765 Instructions for Use 3 8 1 Electrical connection and setup Before a 765 Dosimat is attached to the 757 VA...

Страница 45: ...to Exchange unit Unscrew the attached 6 1805 100 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 26 onto connection 2 of the flat stop cock on the Exchange unit mounted on the Dosimat 2 4 Close unused PTFE tubings Screw a 6 1808 000 Coupling accessory of...

Страница 46: ... Dosimat and screw connection nipple of the PTFE tubing of the 4 way microtip 26 onto connection 2 of the flat stop cock on the Exchange unit 3 Enter new volume of Exchange unit If the volume of the new Exchange unit is different to the volume of the old one proceed as follows Select MAIN WINDOW Settings General Settings Open the Hardware tab in the GENERAL SETTINGS window Enter the new Volume of ...

Страница 47: ... This section describes the procedure for the connection of 813 Compact Autosam pler 731 Relay Box and 772 Pump Units For the connection of 765 Dosimats see section 3 8 3 9 1 Electrical connection Before any instruments are attached to the 757 VA Computrace Stand the 757 VA Computrace Stand must be switched off using the mains switch 12 The 813 Compact Autosampler is connected to the socket Remote...

Страница 48: ...2 0 V 2 2 0 2 4 0 V O I 6 1822 410 6 1831 050 6 1819 010 2 cm 757 6 1805 100 2x6 1808 000 6 1805 020 6 1805 180 6 1819 010 3 cm 6 1819 010 2 cm 6 1819 010 2x6 1820 020 6 1805 530 6 1805 530 2x6 1820 020 2x6 1820 050 2x6 1820 050 6 1805 530 6 1826 100 6 1826 100 6 1805 530 6 1602 105 6 1618 050 6 1829 020 6 1602 105 6 1618 050 6 1819 020 10 cm Rinsing solution Waste Rinsing pump Aspiration pump Fig...

Страница 49: ...ly of the waste solution to gas wash bottle 44 44 Gas wash bottle 6 2405 030 for separating mercury from the waste solution attached 45 PTFE tube 6 1819 010 for siphoning off the waste solution from gas wash bottle 44 attached 118 FEP tubing 6 1805 180 for transferring the waste solution to gas wash bottle 44 119 FEP tubing 6 1805 100 for supply of the rinsing solution 120 PTFE tube 6 1819 010 for...

Страница 50: ...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 118 6 1805 180 into threaded openings 52 and 66 Screw FEP tubing 119 6 1805 100 into threaded opening 53 of the measuring head 20 Screw a 6 1808 000 tubing coupling to the other end of FEP tubing 119 and insert the coupling in a slot of...

Страница 51: ...the FEP tubing 119 is connected see Fig 16 and Fig 17 5 Connect waste container Unscrew red filling connection from first 6 1621 000 container Screw 6 1618 050 threaded adapter to the container Screw 6 1602 105 siphon onto 6 1618 050 threaded adapter Cut 6 1819 020 FEP tube to a length of ca 10 cm and insert from above into the smallest opening of the 6 1602 105 siphon Screw a 6 1805 530 FEP tubin...

Страница 52: ...each Dosimat connected to the remote interface of the 757 VA Com putrace Stand check the Dosimat no checkbox and enter the Volume of the exchange unit installed on the Dosimat and the Dose rate of the Dosi mat Define the addition or predose solutions for the desired method in the DOSIMATS window procedure see Software Manual section 5 2 Fill the exchange units of the Dosimats with the desired solu...

Страница 53: ... and close the GENERAL SETTINGS window Close the 757 VA Computrace 2 0 program and restart it 3 Test automation parameters Fill two sample vessels with water and place them one after the other on the sample rack of the 813 Compact Autosampler Click on MAIN WINDOW Settings General settings and select the Automa tion tab Click on check the automation parameters and modifiy them if need be The defaul...

Страница 54: ...f desired modify the loaded method details see Software Manual 3 Load and modify sample table Click on or MAIN WINDOW Window Sample table to open the SAMPLE TABLE window Load the desired sample table or edit the current sample table details see Software Manual 4 Place samples on 813 Compact Autosampler Transfer the desired sample amount 5 10 mL into the sample vessels and place them at the odd pos...

Страница 55: ...herwise there is a danger of coming into contact with components which are live Before you open the 757 VA Computrace Stand to change components or for maintenance or repair work always switch on the instrument by setting the mains switch 12 to the ON position and then disconnect the mains cable from the mains connection plug 13 of the 757 VA Computrace Stand Protection against static charges Elec...

Страница 56: ... 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 ΘF 38 86 C at pair 1 01325 bar 3 Melting enthalpy HF 2 295 kJ mol at pair ...

Страница 57: ...er handling see section 4 2 3 has ensured that not one single case of mercury poisoning has been reported to date The real Hg concen trations measured in the laboratory atmosphere are consistently far below the TLV threshold limit value 4 2 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 4 ...

Страница 58: ...ust 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 which come into con tact with mercury must be stored in a fume cupboard which is always switched on Use gas wash bottles when siphoning off mercury under vacuu...

Страница 59: ...emistry and Physics 57th edition page E 84 B 32 The Chemical Rubber Publishing Co Cleveland Ohio USA 1976 7 Roth L Sicherheitsdaten MAK Werte 3 Aufl Ecomed Verlagsgesellschaft mbH München 1984 8 Mutschler E Arzneimittelwirkungen Seite 379 Wissenschaftliche Verlagsgesellschaft Stuttgart BRD 1970 9 Auterhoff H Lehrbuch der pharmazeutischen Chemie Seite 75 Wissenschaftliche Verlagsgesellschaft Stuttg...

Страница 60: ...4 Safety 757 VA Computrace Hardware 56 ...

Страница 61: ...chniques DC Direct Current NP Normal Pulse DP Differential Pulse SQW Square Wave 10 2000 Hz AC1 Phase sensitive Alternating Current 1st harmonic 1 250 Hz AC2 Phase sensitive Alternating Current 2nd harmonic 1 250 Hz PSA Potentiometric Stripping Analysis chronopotentiometry CV Cyclic Voltammetry digital ramp Potentiostat Output voltage AE 12 V Output current AE 35 mA Sweep voltage range 5 V Voltage...

Страница 62: ...of 10 internal diameter 0 05 mm Mercury reservoir 6 mL 81 2 g sufficient for ca 200 000 Hg drops Auxiliary power inert gas generally nitrogen N2 p 1 0 2 bar Rotating disk electrode RDE working electrode WE option Construction 6 1246 000 Drive shaft screw on 6 1204 XXX Electrode tips Electrode tips 6 1204 100 Ultra trace graphite 6 1204 110 glassy carbon GC 6 1204 120 platinum Pt 6 1204 130 silver ...

Страница 63: ...of PFA option working volume 10 90 mL 6 1456 210 measuring vessel made of glass for sample changer operation option working volume 10 90 mL 6 1457 210 measuring vessel made of glass with thermostat jacket for sample changer operation option working volume 10 90 mL Dummy Cell Use Checking the 757 VA Computrace Stand Determination of the signal noise ratio Connections AE auxiliary electrode RE refer...

Страница 64: ...and warnings which must be heeded by the user to assure safe operation of the instrument Electromagnetic compatibility EMC Emitted interference Standards met EN55022 class B EN50081 1 2 Immunity to interference Standards met IEC61000 4 2 level 4 IEC61000 4 3 level 2 IEC61000 4 4 level 4 IEC61000 4 5 level 2 3 IEC61000 4 6 level 3 IEC61000 4 8 IEC61000 4 11 ENV50204 EN50082 1 2 Ambient temperature ...

Страница 65: ...tand Instrument without accessories 1 6 0343 000 Pt Auxiliary electrode 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 3 5 2 The Ag AgCl reference system is supplied with a screwed on holder filled with c KCl 3 mol L 1 6 1204 090...

Страница 66: ...amic diaphragm Together with the 6 0728 020 Ag AgCl reference system forms a complete reference electrode double junction construction assembly see section 3 5 2 1 6 1246 010 Drive shaft for stirrer incl 2 O rings FPM Viton Together with the 6 1204 090 stirrer tip forms a complete stirrer 1 6 1246 020 Multi mode electrode incl 2 O rings NBR nitril rubber Together with the 6 1226 030 glass capillar...

Страница 67: ...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 4 765 Dosimats 1 6 2122 0X0 Mains cable to customer s specifications Cable socket Cable plug Type IEC 320 C 13 Type SEV 12 CH 6 2122 020 ...

Страница 68: ...000 Mercury drop catcher silver wire in plastic bottle For the destruction of mercury drops by amalgamation 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 757 VA Computrace Stand 1 6 2709 080 Stopper For closing the pipetting aperture of the 757 VA Computrace Stand 1 6...

Страница 69: ...for 6 2816 020 syringe 1 6 5326 000 VA Computrace Interface cpl For connection of VA Computrace Stand 757 to PC via USB incl the following accessories 1 6 2155 000 VA Computrace Interface 1 6 2151 020 USB Cable 1 8 m 1 6 2158 000 Mains adapter 100 240V 5V DC 1 6 6032 100 PC Software CD VA Computrace 2 0 1 8 757 1013 Hardware Manuel English Instructions for Use for 757 VA Computrace Stand 1 8 757 1...

Страница 70: ...824 000 4 way microtip made of PTFE With 4 lengths of PTFE tubing with connection nipples with thread M6 for the attachment of 4 765 Dosimats 1 6 2122 0X0 Mains cable to customer s specifications Cable socket Cable plug 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 1 6 2135 010 Connection cable to VA Com putrac...

Страница 71: ...es 1 6 5326 000 VA Computrace Interface kpl For connection of VA Computrace Stand 757 to PC via USB incl the following accessories 1 6 2155 000 VA Computrace Interface 1 6 2151 020 USB Cable 1 8 m 1 6 2158 000 Mains adapter 100 240V 5V DC 1 6 6032 100 PC Software CD VA Computrace 2 0 1 8 757 1013 Hardware Manuel English Instructions for Use for 757 VA Computrace Stand 1 8 757 1027 Registration car...

Страница 72: ... 1246 000 Drive shaft forms the stirrer The following electrode tips are available Order No Disk material Shaft material 6 1204 100 Ultra Trace Graphite PVC 6 1204 110 Glassy Carbon GC PEEK 6 1204 120 Pt PEEK 6 1204 130 Ag PEEK 6 1204 140 Au PEEK 6 1204 150 Au PEEK Disk diameter 2 0 0 0 05 mm Concentricity error 0 2 mm 6 1241 020 Electrode holder to take the 6 1247 000 glassy carbon rod Together w...

Страница 73: ...et incl 6 2036 000 holding ring Volume 12 70 mL 6 1450 210 Measuring vessel Made of PFA polyfluoralkyloxy copolymer incl 2036 000 holding ring Volume 10 90 mL 6 2709 040 Stopper made of PVC incl 2 E 301 0004 O rings of NBR nitril rubber For closing the MME opening when the RDE is used with two dummy holes thread M6 for holding the two MME gas lines not used in operation with the RDE 6 2802 000 Pol...

Страница 74: ...813 Compact Autosampler for VA applications Sample changer for up to 18 sample vessels 2 731 0010 731 Relay Box Control unit for the two 772 Pump Units needed for operation of the 813 Compact Autosampler 2 772 0010 772 Pump Unit Peristaltic pump for operation of 813 Compact Autosampler 6 2141 150 Connecting cable 757 731 813 Cable for connection of 731 Relay Box and 813 Compact Autosampler to 757 ...

Страница 75: ...features the orderer has no rights or claims except those mentioned above If damage of the packaging is evident on receipt of a consignment or if the goods show signs of transport damage after unpacking the carrier must be informed im mediately and a written damage report demanded lack of an official damage report releases Metrohm from any liability to pay compensation If any instruments and parts...

Страница 76: ... 50081 Electromagnetic compatibility basic specification Emitted Interference EN 50082 Electromagnetic compatibility basic specification Interference Immunity EN 61010 Safety requirements for electrical equipment for measure ment control and laboratory use Description of the instrument PC controlled system for polarographic and voltammetric trace analysis of organic and inorganic substances Herisa...

Страница 77: ... V Frequency 50 60 Hz Power consumption 26 W This Metrohm instrument has been built and has undergone final type testing according to the standards IEC61000 4 2 level 4 IEC61000 4 3 level 2 IEC61000 4 4 level 4 IEC61000 4 5 level 2 3 IEC61000 4 6 level 3 IEC61000 4 8 IEC61000 4 11 ENV50204 EN55022 class B EN50081 1 2 EN50082 1 2 Electromagnetic compatibility IEC61010 EN61010 UL3101 1 Security spec...

Страница 78: ... 72 73 Connection 10 for inert gas supply Figure 9 Inert gas supply 19 Connection 14 Connection of the VA Computrace Interfaces 15 Figure 9 Connection 15 Connection of 813 Compact Autosampler 43 Connection of Dosimat 765 40 Figure 9 Connection 72 for inert gas supply Attachment of FEP tubing 30 18 Figure 22 Inert gas connection scheme 20 Connection 73 for inert gas supply Attachment of FEP tubing ...

Страница 79: ... 106 Figure 36 Electrolyte compartement 110 Figure 36 Electrolyte vessel 102 6 1245 010 Figure 36 Ordering designation 62 Electromagnetic compatibility 60 EMC 60 Emitted interference 60 Equipping the measuring head 16 EU Declaration of conformity 72 Exchange unit 6 3014 XXX Changing the exchange unit 41 Choice of exchange unit 40 Ordering designation 70 F FEP tubing 18 6 1805 180 Figure 11 FEP tub...

Страница 80: ...easurement techniques 57 Measuring head 20 Equipping 16 Figure 11 17 35 45 Measuring head arm 19 Figure 11 17 35 45 Measuring vessel 6 6 1415 210 Figure 8 Installation 18 Ordering designation 63 Measuring vessel 6 1415 150 69 Measuring vessel 6 1418 220 69 Measuring vessel 6 1450 210 69 Measuring vessels 59 Mercury Filling capillary with vacuum 26 Filling capillary without vacuum 24 Filling with m...

Страница 81: ... 45 Installation 46 Pulse amplitude 58 Pump Unit 772 Electrical connection 43 Ordering designation 70 Tubing connections 46 PVC tubing 6 1801 080 19 63 66 R RDE Construction 34 Figure 35 Insertion in measuring head 16 Regeneration 34 Startup procedure 34 Technical data 58 Rear 9 Reference electrode 22 Add bridging electrolyte 37 Add internal electrolyte 37 Construction 36 Electrical connection 37 ...

Страница 82: ...e range 57 Switch off instrument 14 Switch on instrument 14 Syringe 90 6 2816 020 Figure 23 Filling with mercury 24 Ordering designation 65 System validation 73 T Technical data 57 Threaded opening 52 Figure 17 Threaded opening 53 Figure 17 Threaded opening 56 Figure 17 Threaded opening 57 Figure 17 Threaded opening 59 Figure 17 Threaded opening 61 Figure 17 Threaded opening 62 Figure 17 Threaded ...

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Содержание 757 VA Computrace

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Metrohm 757 VA Computrace, Руководство по оборудованию

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Содержание 757 VA Computrace

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