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1. Use and operation SS S e The systems are designed for ambient temperatures during operation between 10 C and 40 C Check the maximum temperatures if installing the system in a cabinet or a housing and make sure ventilation is adequate Install an external automatic ventilation system if necessary Ensure that the equipment and all components are suitable for the intended applica tion Use the system only for aspiration of liquids Setting up and installing the system Equipment must be connected only to a suitable electrical supply and a suit able earth point Failure to connect the motor to ground may result in deadly electrical shock The supply cable may be fitted with a moulded European IEC plug or a plug suit able for your local electrical supply If the plug has been removed or has to be removed the cable will contain wires colour coded as follows green or green and yellow earth blue or white neutral brown or black live The devices BVC 01 and BVC 21 NT have to be protected by an external fuse according to their current draw cf Technical data The BVC 21 NT VARIO has an internal fuse Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 NOTICE NOTICE A DANGER page 5 of 31 t Do not permit any uncontrolled pressurizing e g ma2. 0 cccceeeceeeeneeeeaeeeanes 688060 to connect a VHC to the VTC Silicone tube sold by metre NW oi 636156 aspiration hose for VHC Filter hydrophobic 638266 Silicone tube 1 m NW 9 6 cc eeccceeeceeeeeeeeeee es 638263 connecting tube PVC tube 1 m NW 12 8 6 4 00 eteeeeee eee 638217 Various adapters e g 8 channel manifold as well as micro pipettes or Pasteur pipettes are available at BRAND GMBH CO KG www brand de en Angular connector for rapid coupling 638252 inclusive O ring Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 19 of 31 Troubleshooting Fault Q Pump fails to start sys tem becomes vented Possible cause Mains not plugged in failure of electrical supply Remedy d Plug in mains plug check mains fuse Motor overloaded d Allow motor to cool identify cause of failure Pressure control device de e Contact your local distributor fective Internal fuse blown BVC 21 d Identify cause of failure re NT VARIO place fuse under the cover Adjusting knob at right stop Turn adjusting knob in direc position atmosphere no tion more vacuum vacuum Filter clogged d Replace filter Q No aspiration
3. 999157 10 12 2009 page 12 of 31 BioChem VacuuCenter BVC 01 connecting tube FN d N ee filter blind cap for further connections Ta screw cap collecting bottle inlet isolation valve with coupling double sidedly sealed if removed coupling connection VHC pressure control device solenoid operated hose nozzle isolation valve connection to vacuum supply Assemble the screw cap with filter and connecting tube Connect the tube of the VacuuHandControl to the hose nozzle of the coupling at the bottle head VacuuHandControl VHC fixing clip thumb wheel control button adapter aspiration tube locking ring handle Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 13 of 31 Use and operation Installation It is imperative to remove the transportation lock prior to use Tilt device care fully onto the side Remove the four locking screws wing screws next to the fan guard at the base plate Put device back to normal operating position and keep the locking screws Make sure ventilation is adequate if equipment is installed in a housing or if ambi ent temperature is elevated Keep a distance of minimum 20 cm between fans or ventilation slots and ambient parts Before switching on the equipm
4. an indefinite status of the equipment Failure of the pumping unit e g by power failure or connected components parts of the supply or change of parameters must not lead to a criti cal dangerous situation under any circumstances In case of diaphragm cracks or leaks in the manifold pumped substances might be released into the environment or into the pump housing Comply especially with notes on operation and use and maintenance Maximum liquid level in collecting bottle approx 80 depending on the ap plication in case of low boiling liquids or in case of suction of liquids which tend to foam the maximum liquid level might be reduced Due to the residual leak rate of the equipment there may be an exchange of gas albeit extremely slight between the environment and the vacuum system Adopt suitable measures to prevent contamination of the pumped substances or the environment In case of overload the motor is shut down by a self hold thermal cutout in the winding Attention Reset possible only manually Switch off the pump or isolate the equip ment from mains Identify and eliminate the cause of failure Wait approx five min utes before restarting the pump Attention In case of supply voltage below 100V the lock of the cutout might be restricted and the pump might restart on its own after sufficient cooling down Take suitable precautions if an automatic restart of the pump may lead to a critical dan gerous situation T
5. at the VHC Adapter or aspiration tube d Replace adapter with aspira pipette drips defective tion tube Filter clogged d Replace filter Leak at the bottle head d Check seals coupling and blind cap Screw in or re place if necessary No pumping speed of the d Perform maintenance re pump place diaphragm and valves if necessary Adjusting knob at right stop Turn adjusting knob in direc position atmosphere no tion more vacuum vacuum Q Pressure control device Leak in the system d Check tubing seals coupling switches frequently and blind cap Screw in or replace if necessary Filter clogged d Replace filter Diaphragms or valves of the Perform maintenance re pump defective place diaphragm and valves if necessary Q Pump is running continu Leak in the system d Check tubing seals coupling ously and blind cap Screw in or replace if necessary Pressure control device de V Contact your local distributor fective Adjusting knob at left stop d Turn the adjusting knob to NOTICE position or close to it vacuum demand below ultimate vacuum of the pump the right in direction less vacuum A service manual with exploded view drawings spare part lists and directions for repair is available on request only in German or English ts The service manual is for trained service people Documents are only to be used and distributed c
6. off by the automatic pressure control BVC 21 NT or until the pump reduces its speed down to standstill BVC 21 NT VARIO After aspiration Carefully pull pipette out of the adapter Attention Risk of contamination and infection Wear protec tive gloves and eye protection Dispose of pipettes according to appropriate regulations Push the locking ring on the control button release aspiration tube Switch off pump Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 17 of 31 The hydrophobic filter retains water and aqueous solutions also in the form of aerosols When using solvents or due to evaporation of water condensate may be recovered in the separator GG Remove separator and drain condensate in case Important Comply with applicable regulations when dispos separator ing of solvents Change filter if necessary contaminated no or bad aspira tion pressure control device switches without demand of vacuum t Use only the original spare part and sterilize and dispose of the filter according to appropriate regulations Note After disinfection with alcohol allow the filter to dry com pletely because the filter may become clogged by alcohol Check liquid level in the collecting bottle regularly Maximally admissible liquid level in
7. responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 27 of 31 Cleaning and decontaminating Autoclaving The aspiration tube and the pipettes of the VacuuHandControl VHC the collecting bottle with bottle head and screw cap and the filter are designated for steam sterilisation at 121 C and 2 bar absolute 1 bar overpressure Time of exposure according to DIN 58946 t 20 minutes It is the user s responsibility to ensure effective autoclaving Maximum liquid level in collecting bottle 80 in case of low boiling liquids or in case of liquids which tend to foam the maximum liquid level might be reduced Prior to autoclaving remove the flask head from the bottle Do not remove the metal fittings from the flask head If necessary tighten the metal fittings only by hand maximum torque 3 Nm and only if the equipment is at room temperature Chemical disinfection A wiping and spray disinfection of the VacuuHandControl VHC is possible by using the germicide Poursept A By and by discolourations and changes of features of materials e g resiliency elasticity tightness cracking etc due to frequent steam sterilisations are not to be excluded Important notes on utilisation of disinfectants During the aspiration process the collecting bottle of the pumping units ACAUTION BVC 21 NT BVC 21 NT VARIO and BVC 01 must not contain any disinfecting solutions wh
8. temperature cleaning agent ultrasonic treatment and mechanical stress from pressurised water may result in damage to the paint Please mark in the health and safety clearance form if you wish a repaint at your expense just in case such a damage should occur We also replace parts due to optical aspects upon your request Before returning the equipment ensure that if applicable Equipment has been cleaned and or decontaminated All inlet and outlet ports have been sealed Equipmenthas been properly packed if necessary please order an original pack aging costs will be charged marked as appropriate and the carrier has been notified Ensure that the completed health and safety declaration is enclosed We hope for your understanding for these measures which are beyond our control Scrapping and waste disposal Dispose of the equipment and any components removed from it safely in accordance with all local and national safety and environmental requirements Particular care must be taken with components and waste oil which have been contaminated with dangerous substances from the process Do not incinerate fluoroelastomer seals and O rings You may authorize us to dispose of the equipment at your expense Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 200
9. utes to allow the capacitors to discharge c Ensure that the pump cannot be operated accidentally Never operate the pump if covers or other parts of the pump are disassembled Never operate a defective or damaged pump c Attention The pump might be contaminated with noxious or otherwise danger ous process chemicals that have been pumped during operation Ensure that the pump is decontaminated before maintenance and take adequate precautions to protect people from the effects of dangerous substances if contamination has occurred Wear appropriate safety clothing when you come in contact with con taminated components e Before starting maintenance vent the system and allow sufficient cooling of the pump e Drain condensate if applicable Avoid the release of pollutants Ensure that maintenance is done only by suitably trained and supervised techni cians Ensure that the maintenance technician is familiar with the safety procedures which relate to the products processed by the pumping system In order to comply with law occupational health and safety regulations safety at work law and regulations for environmental protection vacuum pumps components and measuring instruments returned to the manufacturer can be repaired only when certain procedures see section Notes on return to the factory are followed Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check car
10. 342 808 450 b d 7 vacuuoran Technology for Vacuum Systems E Mail info vacuubrand de Cvacuubrand 2009 VACUUBRAND GMBH CO KG Printed in Germany Web www vacuubrand com Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009
11. 9 page 29 of 31 Health and safety clearance form Declaration concerning safety potential hazards and safe disposal of waste e g used oil Safety and health of our staff laws and regulations regarding the handling of dangerous goods occupational health and safety regulations safety at work laws and regulations regarding safe disposal of waste e g waste oil require that for all pumps and other products this form must be sent to our office duly completed and signed before any equipment is dispatched to our premises Products will not be accepted for any procedure and handling and repair DKD calibration will not start before we have received this declaration a Fax or post a completed copy of this form to us in advance The declaration must arrive before the equipment Enclose a second completed copy with the product If the product is contaminated you must notify the carrier GGVE GGVS RID ADR b Inevitably the repair process will be delayed considerably if this information is missing or this procedure is not obeyed We hope for your understanding for these measures which are beyond our control and that you will assist us in expediting the repair procedure c Make sure that you know all about the substances which have been in contact with the equipment and that all ques VACUUBRAND GMBH CO KG Technology for Vacuum Systems tions have been answered correctly and in detail 1 Product Model cccc
12. amage and replace if necessary Use petroleum ether or industrial solvent to remove de posits Do not inhale SS S View of the disassembled pump head parts 1 Housing Connecting rod Washer Diaphragm support disc Diaphragm Diaphragm clamping disc with square head screw Head cover Valves Housing cover with housing cover insert Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 23 of 31 Replacing the diaphragm Use a face wrench to remove the diaphragm support disc Check for washers under clamping disc Make sure that the original number is reassembled t Smaller number of washers The pump will not attain ulti mate vacuum More washers Clamping disc will hit head cover noise or even blockade damage of the pump sw Position new diaphragm between diaphragm clamping disc with square head screw and diaphragm support disc t Make sure that the square head screw of the diaphragm clamping disc is correctly seated in the guide hole of the diaphragm support disc t Attention Position diaphragm with pale side to diaphragm clamping disc to pump chamber Use face wrench with torque indicator recommended face wrench with torque indicator from VACUUBRAND Cat No 637580 to assemble diaphragm clamping disc diaphra
13. changed It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 26 of 31 Assembling of components Replacing the aspiration tube at the VHC Ensure that there is no liquid in the tube risk of contamina tion Remove adapter from the fixing clip While pressing the con trol button pull out the aspiration tube Assembling new aspiration tube While pressing the control button insert the new aspiration tube between thumb wheel and roller Insert adapter into the aspiration tube Support the fixing clip suitably and assemble the adapter to the fixing clip Ensure that there is no liquid in the tube risk of contamina tion Remove connecting tube from the filter Remove the filter from the piece of tube at the hose nozzle Assemble new filter position with the printed side towards the bottle and assem ble connecting tube Remove screw cap from bottle Remove the blind cap loosen locknut inside the screw cap blind plug f Insert lead through 2 with coupling 1 Attention Parts are Se sealed with adhesive for leak tightness and with seal ring 3 through the screw cap Push hose 5 onto lead through and fasten hose 5 under the screw cap with locknut 4 Adjust hose towards flask wall Assemble screw cap Documents are only to be used and distributed completely and unchanged It is strictly the users
14. collecting bottle ap prox 80 depending on the application in case of low boil N ing liquids or in case of suction of liquids which tend to foam screw cap N the admissible liquid level might be reduced Emptying of the collecting bottle t Switch off pump or isolate pump from system vent the system release VHC Remove the connecting tube from the filter isolate connections in case t Remove screw cap from the collecting bottle Remove bot tle from the support Sterilize and dispose of collected liq uid according to appropriate regulations Attention Do not remove connections in case of liquid in the tube Do not touch contaminated parts when removing the screw cap Risk of infection Wear appropriate protective clothing e g gloves Do not remove the metal fitting at the screw cap If the fitting is loose tighten the fitting carefully from the in metal fitting de Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 18 of 31 Accessories spare parts Collecting bottle VacuuTransContainer VTC 688057 with filter coupling and blind cap Bottle with screw Cap oun ccc cecccceeeceeeeeeeeaeeeees 638246 Without filter coupling blind cap screw cap unmachined VacuuHandControl VH 688056 Connection set VHC 00 0
15. ctive and trouble free realisation of your work Yours VACUUBRAND GMBH CO KG After sales service Contact your local dealer or call 49 9342 808 193 Danger Immediate danger Death or severe injuries as well as damage to equipment and environment can occur A DANGER t Warning Possible danger Severe injuries as well as damage to equip ment and environment can occur e Caution Possible danger Slight injuries as well as damage to equip ment and environment can occur NO ICE Note Disregarding of notes may cause damage to the product Caution Hot surface Isolate equipment from mains before removing the cover Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 3 of 31 Contents Set MANON cece ce ce ceeensessececeeceeresenesencceecceses ceqcene seneceeceevecseeesasesexceenecssceaeeesssesee 4 SONG al IORI OM DEE 4 Mendo e WEE 4 Setting up and installing the system WEE 4 Ambient conditions s csccsivsnsedennnctacdcandeccaded Eege eege Agen SdbA ertt veekegiK eg eeg De Ad Ag ene bekeeeN EN AE eeh Enere Eee e Operaung eine Te 5 Safety during operation ENEE 6 Maintenance and Be 8 TECNNICI EE 9 Wetted materials E 10 YONDE e E EE 11 Use and Kei EE UE 13 JET e EE 13 DUMT CDCR AN ON EE 13 MICO eet 15 el ae ed e e emersi aE EEE EEA E Eee aeai
16. eeeeeeeeeeeeeees 3 List of substances in contact with the equipment or reaction products 3 1 Chemical substance name chemical symbol 3 2 Important information and precautions e g danger classification 4 Declaration please mark as applicable E 4 1 for non dangerous goods We assure for the returned product that neither toxic corrosive biologically active explosive radio active nor contamination dangerous in any way has occurred the product is free of dangerous substances the oil or residues of pumped media have been drained E 4 2 for dangerous goods We assure for the returned product that all substances toxic corrosive biologically active explo sive radioactive or dangerous in any way which have been pumped or been in contact with the product are listed in 3 1 that the information is complete and that we have not with held any information the product in accordance with regulations has been Q cleaned decontaminated U sterilized Alfred Zippe Str 4 97877 Wertheim Tel 49 9342 808 0 Fax 49 9342 808 450 2008 VACUUBRAND GMBH CO KG Printed in Germany E Mail info vacuubrand de Web www vacuubrand de 5 Way of transport carrier If the paint is damaged we wish a repaint or a replacement of parts due to optical as pects at our expense see Notes on return to the factory Q yes LI no We declare that the following measures where applicable have be
17. efully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 9 of 31 Technical data Type BVC 21 NT VARIO BVC 21 NT BVC 01 Maximum pumping speed Ultimate vacuum absolute mbar Maximum permissible inlet pres sure absolute par Maximum permissible outlet bar 1 1 pressure absolute No load speed min 0 1800 1500 1800 sa Control range mbar 100 atmosphere a ae Permissible ambient temperature C 10 to 60 10 to 40 storage operation Permissible relative atmospheric moisture during operation 30 to 85 no condensation Maximum permissible range of supply voltage 100 120 V 5 10 50 60 Hz Attention Observe specifica 230 V 10 50 60 Hz tions of rating plate Rated current at 100 120 V 50 60 Hz 2 maximum 230 V 50 60 Hz 0 9 maximum Internal fuse Motor protection Degree of protection IEC 529 sana Ls Adapter for VHC pasteur pipettes capillaries pipette tips 100 ul hose nozzle Outlet hose nozzle DN 10 mm DN 6 10 mm Hydrophobic filter Type GA lt D r D Midisart 2000 Sartorius 0 2 Degree of protection IEC 529 IP 20 IP 20 IP 52 300 x 255 x Dimensions L x W x H approx mm 275 x 450 x 520 500 Weight approx kg 14 5 12 2 4 at 50 60 Hz We reserve the right for technical modifications without prior notice Manufacturer Nominal pore diameter Documents are only to be used and distributed complet
18. ely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 10 of 31 pm ane S o o Hose nozzle outlet BVC 01 e Seenen nr coem SSS O C SCS dSOSOSSSCS C SOS Fitter Housing Im Aspiration controller VHC a We reserve the right for technical modifications without prior notice Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 11 of 31 System parts BioChem VacuuCenter BVC 21 NT BVC 21 NT VARIO fig BVC 21 NT VARIO f filter connecting tube inlet diaphragm pump with coupling double sided sealed if removed blind cap for further connections VHC screw cap coupling collecting bottle adjusting knob for vacuum control recessed gri grip only BVC 21 NT VARIO Rear view rating plate E handle es bs 8 outlet separator mains connection On off switch Connect the tube of the VacuuHandControl VHC to the hose nozzle of the coupling of the bottle head Assemble the connecting tube with filter Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no
19. en taken The oil has been drained from the product Important Dispose of according to national regula tions The interior of the product has been cleaned All inlet and outlet ports of the product have been sealed The product has been properly packed if neces sary please order an original packaging costs will be charged and marked as appropriate The carrier has been informed about the hazardous nature of the goods if applicable We assure VACUUBRAND that we accept liability for any damage caused by providing incomplete or incorrect infor mation and that we shall indemnify VACUUBRAND from any claims as regards damages from third parties We are aware that as expressed in 823 BGB Public Law Code of Germany we are directly liable for injuries or dam ages suffered by third parties particularly VACUUBRAND employees occupied with handling repairing the product eler TE Name Ae dir E JOD TNE d GE Company EES Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 30 of 31 LE Konformitatserklarung Declaration of conformity Declaration de conformite Pumpstand Pumping unit Groupe de pompage BVC 01 230V 688067 688068 688069 BVC 21 NT 230V 688250 688251 688252 BVC 21 NT VARIO 230V 688260 688261 688262 Hierm
20. ent check that mains voltage and current conform with the equipment N OTI C E Remove the protective foils from the fittings at the flask head and in case the protec tive covers from the inlet of the diaphragm pump the solenoid operated valve BVC 01 or the collecting bottle Assemble the connecting tube with filter between the bottle head and the inlet of the diaphragm pump BVC 21 NT BVC 21 NT VARIO or the inlet of the solenoid operated valve BVC 01 Connect the aspiration tube of the VacuuHandControl VHC to the coupling at the bottle head Connect the mains cable at the rear of the device BVC 21 NT BVC 21 NT VARIO or plug the mains cable into the pressure control device BVC 01 Plug the IEC socket of the solenoid operated valve BVC 01 into the pressure control device If the pump is installed in altitudes of more than 1000 m above mean sea level check compatibility with applicable safety requirements motor may overheat due to insuf ficient cooling The device BVC 21 NT VARIO features an internal fuse under the cover hood See section Replacing diaphragms and valves when removing the cover hood to check replace the fuse During operation e Maximum ambient temperature 40 C AACAUTION e Operate the system only with the integrated hydrophobic filter Protection of the pump against liquids and contamination Protection of the environment user against contamination risk of infection The VHC allows the aspirati
21. eratures without air self inflammable substances substances which are inflammable without air and explosive substance e The devices are not suitable for pumping substances which may form deposits inside the pump Deposits and condensate in the pump may lead to increased temperatures even to the point of excessing the maximum permitted tempera tures Increased temperatures may cause ignition of inflammable substances be ing eventually inside the pump e f there is a danger of the formation of deposits in the pump chamber check inlet and outlet of the pump inspect the pump chamber regularly and clean if neces sary e The pumps are not suitable for pumping dust and have no approval for opera tion below ground If pumping different substances it is recommended to purge the pump with air or inert gas prior to changing the pumped media in order to pump out residues and to avoid reactions of the pumped substances with each other and with the pump ma terials Take into consideration interactions and chemical reactions of the pumped media Ensure that the materials of the wetted parts are compatible with the pumped substances see section Technical data Safety during operation Adopt suitable measures to prevent the release of dangerous toxic explosive corrosive noxious or polluting fluids vapours and gases In case install an ap propriate collecting and disposal system and take protective action for pump and envi
22. etween housing and head cover Screw in four socket head screws fixing housing cover crosswise first slightly then tighten t Do not tighten until head cover is in contact with housing torque 12 Nm Establish hose connections to the pump head in three places Push transparent PVC hoses 2x onto the hose connec tors 1 2 sw Push PTFE tubing onto the connector at the quick cou pling 3 Fix the PTFE tubing with the clip to the hose connector Close clip with flat pliers Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 25 of 31 Mounting the cover hood Position cover hood on the pump c Pay attention that the metallic rear panel runs without can ting in the slots of the cover hood Slide on cover hood completely t Do not cant the cover at the ducts of the quick coupling or the adjusting knob Use a Hex key size 2 5 to screw in the 4 securing screws of the cover on the rear side Tilt device carefully onto the left side Use a Torx screw driver TX 20 to screw in the 4 securing screws of the cover yy BVC 21 NT VARIO Loosen the two socket head screws holding the variable speed drive slightly half a turn ts Attention Don t undo the socket head screws completely on any account Move the variable
23. gm and diaphragm support disc and eventually washers to the connecting rod t Make sure that the square head screw of the diaphragm clamping disc is correctly seated in the guide hole of the diaphragm support disc Optimum torque for the diaphragm support disc 6 Nm The optimum torque is achieved if the pointer in the handle of the VACUUBRAND face wrench shows to the longer marking line zs Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 24 of 31 Assembling the pump head By turning eccentric bushing front of connecting rod bring connecting rod into a position in which diaphragm is in contact with housing and centred with respect to bore t Tilt pump carefully onto the left side so that the diaphragm is on top Support pump appropriately Reassemble in reverse order Install head cover valves and housing cover with housing cover insert cs Make sure that the valves are correctly seated Valves at the outlet with round centred opening under valve valves at the inlet with kidney shaped opening beside valve By turning eccentric bushing bring connecting rod into up per turning point position Maximum stroke of the rod cs Pay attention that the diaphragm stays positioned centrally so that it will become clamped uniformly b
24. he A weighed emission sound pressure level of the pump does not exceed 70 dB A Measurement according to EN ISO 2151 2004 and EN ISO 3744 1995 with standard silencer or exhaust tube at outlet Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 NOTICE page 8 of 31 Maintenance and repair Wear parts have to be replaced regularly In case of normal wear the lifetime of the diaphragms and valves is gt 10000 operating hours Bearings have a typical du rability of 40000 h Motor capacitors have a typical durability in the range of 10000 to 40000 h depending strongly on the operation conditions like ambient temperature humidity or load e Check every motor capacitor regularly by measuring its capacity and estimating its operation time Exchange old capacitors early enough to prevent a failure If an overaged motor capacitor fails it might get hot and even melt and may cause a flame to form which could be dangerous for persons and equipment in the vicinity Motor capacitors have to be replaced by an electrician Before starting maintenance vent the system switch off the device and isolate the equipment from the electrical supply Isolate equipment from mains before removing the cover Before starting maintenance isolate the equipment from mains and wait two min
25. i 16 Accessories spare PaltS ccccceceeeceneeeceneeeeeeseneeeseeseeeeesanseseeeeseecaeseeeeeseeseesasseeses 18 ge le Le Le CNG E 19 Replacing diaphragms anq VaIVES cccccceeceeeeceeeeeeeseeceeseneseneeeeseneseneseeseneseneseeess 20 Removing cover hood from base polate 21 Cleaning and inspecting the PUMP head nnannnnnnnannnnnnnnnnnnnnsnnnnnnnnnrnnrrnrrnnrrsnrnsnrrnrrrnnrsrrrnnrrererni 21 Replacing the diaphragm NEEN RENE 23 Assembling the pump head EEN 24 Assembling the connecting hoses Ab 24 Mo ning Me cover NOOO EE 25 Replacing the EE 25 Assembling of GOOD geeeeessbeegregesgesEa gege SES ENEE EES EEEEEEEEEESEN Eeer 26 Replacing the aspiration tube at the VH 26 Replacing ft CU 26 Assembling a second connection Set VH 26 Cleaning and decontaminating cccccsceeeeceeeeceeesceeeceeeceneeeneeeneseeeseeneeenessnesenenes 27 Notes on return to the factory ccccccecceseeeeeeeeeeeeeeseeneceeeeeesenesceesenseenesenesaesoaees 28 Health and safety clearance form ccccceeceeeeeeeeeeeeeeeeeeeeeeeenesceeeeeneeeneaeneseneseaaes 29 Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 4 of 31 Safety information NOTICE AAWARNING ACAUTION NOTICE A DANGER General information ts Before operating the equ
26. icable and relevant safety requirements regulations and guidelines implement the required actions and adopt suitable safety meas ures For aspiration of liquids connect the system BVC 01 to a suitable vacuum supply Ambient conditions To the best of our knowledge the equipment is in compliance with the requirements of the applicable EC directives and harmonized standards see Declaration of con formity with regard to design type and model especially directive IEC 1010 This directive gives in detail conditions under which the equipment can be operated safe ly see also IP degree of protection Adopt suitable measures in case of differences e g using the equipment outdoors installation in altitudes of more than 1000 m above mean sea level conductive pol lution or bedewing Pay attention to the permissible maximum ambient temperatures see Technical data Operating conditions The devices have no approval for operation in or for pumping of potentially explosive atmospheres Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 NOTICE A DANGER page 6 of 31 The devices are not suitable to pump unstable substances and substances which react explosively under impact mechanical stress and or when being exposed to elevated temp
27. ich corrode the materials of the pumping unit t Disinfectants which corrode the materials of the pumping unit see section Technical data may only be poured in the collecting bottle once it is separated from the pumping unit t In particular no disinfectants may be used which release chlorine or oxy gen radicals e g sodium hypochlorite peroxo compounds Aggressive disinfectants like for example Chlorax can corrode the material of the collecting bottle and other components This may lead to stress cracks and breaking of the bottle t Therefore the use of e g Chlorax is not allowed except for short time cleaning of the collecting bottle Rinse collecting bottle thoroughly afterwards to avoid residues of the disinfectant in the bottle t Using corroding disinfectants may result in damage malfunction and or failure of the pumping unit t Chlorine permeates the hydrophobic filter on top of the collecting bottle and damages the materials of the quick couplings t Leaking of liquid from a damaged collecting bottle or suction tube may lead to contamination of per sonnel and material or to damage destruction of wetted equipment or laboratory furniture The use of the disinfectant Sekusept Plus Manufacturer Ecolab GmbH amp Co OHG Dusseldorf in extensive in house testing did not cause any damaging of the collecting bottle or the vacuum pump Hence the disinfectant Sekusept Plus even applicable in the collecting bottle dur
28. ing suction is to be preferred Comply with use and safety instructions of the manufacturer t Even if using disinfecting solutions after termination of the suction it is absolutely necessary to assure the compatibility of disinfectant and the parts to be disinfected t For information about the compatibility with the materials of the pumping unit ask the manufacturer of the disinfectant t The wetted materials of the pumping unit are listed in the section Technical data Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 28 of 31 Notes on return to the factory Repair return DKD calibration NOTICE NOTICE Safety and health of our staff laws and regulations regarding the handling of dan gerous goods occupational health and safety regulations and regulations regarding safe disposal of waste require that for all pumps and other products the Health and safety clearance form must be send to our office duly completed and signed before any equipment is dispatched to our premises Fax or post a completed copy of the health and safety clearance form to us in advance The declaration must arrive before the equipment Enclose a second completed copy with the product If the equipment is contaminated you must notify the carrier No repa
29. ipment read and comply with the section Clean ing and decontamination GG Read and comply with this manual before installing or operating the equip ment Lift and transport the equipment at the provided handles and or recessed grips It is imperative to remove the transportation lock at the underside of the equip ment prior to use BVC 21 NT BVC 21 NT VARIO Keep the locking screws and install again prior to further transportation Remove all packing material remove the product from its packing box remove the protective covers from the inlet and outlet ports and keep inspect the equipment If the equipment is damaged notify the supplier and the carrier in writing within three days state the item number of the product together with the order number and the supplier s invoice number Retain all packing material for inspection Do not use the equipment if it is damaged If the equipment is not used immediately replace the protective covers Store the equipment in suitable conditions ER ER Intended use The system and all system parts are not to be used on humans or animals Prevent any part of the human body from coming in contact with the vacuum Make sure that the individual components are only connected combined and op erated according to their design and as indicated in the instructions for use Use only original VACUUBRAND accessories t Comply with notes on correct vacuum and electrical connections see section
30. ir DKD calibration is possible unless the correctly completed form is returned Inevitably there will be a delay in processing the equipment if infor mation is missing or if this procedure is not obeyed If the product has come in contact with chemicals radioactive substances or other substances dangerous to health or environment the product must be decontami nated prior to sending it back to the factory Return the product to us disassembled and cleaned and accompanied by a certificate verifying decontamination or Contact an industrial cleaning and decontamination service directly or Authorize us to send the product to an industrial cleaning facility at your ex pense To expedite repair and to reduce costs please enclose a detailed description of the problem and the product s operating conditions with every product returned for repair We submit quotations only on request and always at the customer s expense If an order is given the costs incurred are offset from the costs for repair or from the purchase price if the customer prefers to buy a new product instead of repairing the defective one If you do not wish a repair on the basis of our quotation the equipment might be returned to you disassembled and at your charge In many cases the components must be cleaned in the factory prior to repair For cleaning we use an environmentally responsible water based process Unfor tunately the combined attack of elevated
31. it erklaren wir dass das oben bezeichnete Gerat in Konzeption und Bauart sowie in der von uns in Verkehr gebrachten Ausf hrung den grundlegenden Anforderungen der zutreffenden aufgef hrten EU Richtlinien entspricht Bei einer mit uns nicht abgestimmten nderung an dem Ger t verliert diese Erkl rung ihre G ltigkeit We herewith declare that the product designated above is in compliance with the basic requirements of the applicable EC directives stated below with regard to design type and model sold by us This certifi cate ceases to be valid if the product is modified without the agreement of the manufacturer Par la pr sente nous d clarons que le dispositif d sign ci dessus est conforme aux prescriptions de base des directives EU applicables et indiqu s en ci que concerne conception dessin et mod le vendu par nous m mes Cette d claration cesse d tre valable si des modifications sont apport es au dispo sitif sans notre autorisation pr alable Maschinenrichtlinie mit nderungen Machine directive with supplements Directive Machines avec des suppl ments 2006 42 EG Niederspannungsrichtlinie Low Voltage Directive Directive Basse Tension nicht anwendbar auf not applicable to pas applicable a BVC 01 688067 688068 688069 2006 95 EG Richtlinie Elektromagnetische Vertr glichkeit Electromagnetic Compatibility Directive Directive Com patibilite Electromagnetique 2004 108 EG Angewandte Harmonisierte No
32. ke sure that an exhaust pipeline cannot become blocked Risk of bursting t Due to the high compression ratio of the pumps pressure at the outlet port might be generated being higher than the maximum permissible pressure compatible with the mechanical stability of the system t Always provide a free and pressureless exhaust pipeline e Comply with maximum permissible pressures and pressure differences see section Technical data Do not operate the pumping unit with overpressure at the inlet or outlet e Check that mains voltage and current conform with the equipment see rating plate e Avoid overpressure of more than 0 2 bar in case inert gas is connected Provide a firm level platform for the equipment Ensure a stable position of the pump without any mechanical contact except of the pump feet Comply with all applicable safety regulations Install an external automatic ventilation system if necessary Keep a distance of minimum 20 cm between fan and ambient parts e g housing walls Check fan regularly for dust dirt clean if necessary to avoid a cutback of ventilation Avoid high heat supply e g due to hot process gases If the equipment is brought from cold environment into a room for operation allow the equipment to warm up pay attention to water condensation on cold surfaces The diameter of the an outlet pipeline should be at the least as large as the diameter of the pump connections Comply with all appl
33. nel and environment Ensure that maintenance is done only by suitable trained and supervised tech nicians Ensure that the maintenance technician is familiar with the safety proce dures which relate to the products processed by the pumping system ts Before starting maintenance vent the system Uncouple the collecting bottle and remove Isolate equipment from mains before removing the cover Wait two minutes to allow the capacitors to discharge Allow sufficient cool ing of the pump Drain condensate if applicable Avoid the release of pollutants t Ensure that the pump cannot be operated accidentally Never operate the pump if covers or other parts of the pump are disassembled Never operate a de fective or damaged pump e Attention The pump might be contaminated with noxious or otherwise danger AACAUTION ous process chemicals that have been pumped during operation Ensure that the pump is decontaminated before maintenance and take adequate precautions to protect people from the effects of dangerous substances if contamination has oc curred e Wear appropriate safety clothing when you come in contact with contaminated components Avoid the release of pollutants SELON seals BYG ZU CR W 696813 Diaphragm BVC 21 NT VARIO sssceccoescnecczeeestecscesssanaciensencaecedecadenpedeseodenededecwasuedewodeseiaudoctesiadiaune 639786 Valve BYG 2T NT E 2x 637225 Face wrench with torque indicator 637580 ts Please read section Replaci
34. ng diaphragms and valves completely before starting maintenance Partially the pictures show pumps in other versions This doesn t influence replacing diaphragms and valves of the pump Tools Phillips screw driver size 2 Hex key size 2 5 5 Screw driver Torx TX20 Flat bladed screw driver Face wrench with torque indicator Flat pliers Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 21 of 31 Removing cover hood from base plate remove e adjusting K knob Switch device off and unplug mains cable Uncouple hose between collecting bottle and pump at the quick coupling Remove bottle from its holder BVC 21 NT VARIO Remove adjusting knob of vacuum control carefully Tilt device carefully onto the left side BVC 21 NT VARIO Loosen the two socket head screws holding the variable speed drive slightly half a turn t Attention Don t undo the socket head screws completely on any account Move the variable speed drive in the slots of the base plate to the back until the axis of the adjusting knob has disap peared completely inside the cover hood Tighten the two socket head screws again Use a Torx screw driver TX 20 to remove the 4 securing screws of the cover hood Put device back to n
35. ompletely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 20 of 31 Replacing diaphragms and valves All bearings are encapsulated and are filled with long life lubricant Under normal ope N OTI C E rating conditions the pump is maintenance free The valves and diaphragms as well as the motor capacitors are wear parts If the rated ultimate vacuum is no longer achieved or in case of increased noise level the pump interior the diaphragms and the valves must be cleaned and the diaphragms and valves must be checked for cracks or other damage Check motor capacitors regularly by measuring their capacity and estimating their operation time Exchange old capacitors early enough to prevent a failure The capacitors have to be replaced by an electrician Depending on individual cases it may be efficient to check and clean the pump heads on a regular basis In case of normal wear the lifetime of the diaphragms and valves is gt 10000 operating hours t Prevent internal condensation transfer of liquids or dust The diaphragm and valves will be damaged if liquids are pumped through the pump in significant amount If the pump is exposed to corrosive gases or vapour or in case of deposits mainte nance should be carried out frequently t Regular maintenance will improve the lifetime of the pump and also protect both person
36. on of excess liquids See section VacuuHandControl NOTICE VHC for operation method The pump achieves its pumping speed ultimate vacuum and vapour pumping rate only at operating temperature after approx 15 minutes Prevent internal condensation transfer of liquids or dust The diaphragm and valves will be damaged if liquids are transferred through the pump in significant amounts In case of excess temperature the motor is shut down by a thermal cutout in the winding Manual reset is necessary Switch off the pump or isolate the equipment from mains Identify cause of failure and eliminate Wait approx five minutes before restarting the pump Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 NOTICE page 14 of 31 Attention In case of supply voltage below 100V the lock of the cutout might be restricted and the pump might restart on its own after sufficient cooling down Take suitable precautions if an automatic restart of the pump may lead to a critical dan gerous situation After a power cut the system will automatically start again BVC 21 NT The vacuum pump operates at constant speed and is switched by an automatic pressure control as necessary Thus the collecting bottle provides the necessary vacuum for the next aspirations Avoid too frequent s
37. ormal operating position sw Use a hex key size 2 5 to remove the top 4 securing screws see small figure of the cover hood on the rear side Remove cover hood carefully upwards t Do not cant the cover at the ducts of the quick coupling or the adjusting knob Cleaning and inspecting the pump head Undo hose connections to the pump head in three plac es Remove transparent PVC hoses 2x from the hose con nectors 1 2 Open the clip at the connection of the PTFE tubing at the quick coupling 3 with a flat bladed screw driver Remove PTFE tubing from hose connector Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 22 of 31 To check valves use hex key to remove four socket head screws from pump head and remove upper housing housing cover with housing cover insert head cover and valves t Position the pumping unit onto its left side with the pump head at the top to facilitate maintenance Bi c Never remove parts by using a spiky or sharp edged tool d AE e g screw driver we recommend to use a rubber mallet d WW or compressed air to be blown carefully into port Remove head cover from housing cover insert and check valves Note position of valves and remove Replace valves if necessary Check diaphragm for d
38. rmen Harmonized Standards applied Normes Harmonis es utilis es DIN EN 12100 2 DIN EN 61010 1 DIN EN 1012 2 DIN EN 61326 1 Managementsysteme Management systems Systemes de Management EN ISO 9001 EN ISO 14001 1997 2006 Wertheim 01 12 2009 Dr F Gitmans Dr J Dirscherl Gesch ftsf hrer Managing Director G rant Technischer Leiter Technical Director Directeur technique VACUUBRAND GMBH CO KG Alfred Zippe Str 4 97877 Wertheim Vakuumtechnik im System Tel 49 9342 808 0 Fax 49 9342 808 450 Technology for Vacuum Systems E Mail info vacuubrand de Technologie pour syst me a vide Web www vacuubrand com Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 31 of 31 Disclaimer Our technical literature is only intended to inform our customer The validity of general em pirical values and results obtained under test conditions for specific applications depend on a number of factors beyond our control It is therefore strictly the users responsibility to very carefully check the validity of application to their specific requirements No claims arising from the information provided in this literature will consequently be entertained VACUUBRAND GMBH CO KG Alfred Zippe Str 4 97877 Wertheim Tel 49 9342 808 0 Fax 49 9
39. ronment fthe equipment is used in combination with hazardous materials e g in med ical microbiological laboratories check all relevant safety and health require ments and determine the applicability of regulatory limitations prior to use if nec essary Prevent any part of the human body from coming in contact with the vacuum Use appropriate safety work materials and methods if necessary e g steam sterilization sterilization indicators or germicides Notes concerning the steriliza tion of wetted parts see Technical data see section Cleaning and decontami nating It is the user s responsibility to ensure effective sterilization Vd The user must take suitable precautions to prevent any formation of explosive mixtures in the expansion chamber or in the housing In case of e g a diaphragm crack mechanically generated sparks hot surfaces or static electricity may ignite these mixtures Use inert gas for venting if necessary Potentially explosive mixtures at the outlet of the pump have to be drained ap propriately sucked off or diluted with inert gas to non explosive mixtures t Pay attention to the symbol hot surfaces on the equipment Adopt suitable measures to prevent any danger arising from hot surfaces Allow pump to cool down before starting maintenance Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the
40. speed drive in the slots of the base plate to the front until the axis of the adjusting knob protrudes the cover hood Attach the adjusting knob of the vacuum control onto the axis Position the variable speed drive in the slots of the base plate so that the adjusting knob turns without touching the cover Tighten the two socket head screws again Put device back to normal operating position Couple hose between collecting bottle and pump at the quick coupling Put bottle back in holder gt t In case the diaphragm and the valves have been replaced a run in period of several hours is required before the pump achieves its ultimate vacuum If the pump does not achieve the ultimate vacuum BVC 21 NT VARIO variable switch off point ultimate vacuum is reached with adjust ing knob turned completely to the left BVC 21 NT pump is switched off automatically before reaching its ultimate vacu um If the specified ultimate vacuum is not achieved or if the BVC 21 NT does not reach its switching point and if this does not change after the run in period Check hose connectors at pump head for leaks If necessary recheck pump cham ber Replacing the fuse Replacing the internal fuse BVC 21 NT VARIO Isolate equipment from mains remove cover hood see section Replacing diaphragm and valves Open fuse carrier and replace fuse fuse carrier Documents are only to be used and distributed completely and un
41. spiration with the VHC pressure rise in the collecting bottle Avoid frequent switching on and off After switching off wait 2 minutes before switch ing on again Draining the separator t Check liquid level regularly If neces sary drain separator Loosen union nut union nut Remove separator Drain condensate Assemble separator again Tighten un ion nut hand tight g separator BVC 01 When connecting a vacuum pump at the pressure control device Maximum permit ted power draw at the connection of the vacuum pump 6A ohmic 1 5A inductive Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 15 of 31 Shutdown Short term NOTICE Has the pump been exposed to condensate Allow the pump to continue to run at atmospheric pressure for a few minutes Has the pump been exposed to media which may damage the pump materials or form deposits Check and clean pump head if necessary Long term Take measures as described in section short term shutdown Close inlet and outlet port e g with transport caps Store the pump in dry conditions Shipment Install transportation lock again Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of
42. this document with respect to his product Manual no 999157 10 12 2009 page 16 of 31 VacuuHandControl VHC The instrument allows the aspiration of excess liquids The VHC is supplied completely with three differ ent adapters included in delivery to hold with pasteur pipettes capillaries and pipette tips 100 ul Before aspiration Push back the locking ring from the control button Choose the appropriate adapter and carefully insert the pi pette into the adapter Position pipette tip by turning the fixing clip in such a way that working is comfortable and fatigue proof Remove adapter from fixing clip if is hard to turn Squeeze fixing clip and turn to desired position Put adapter back in fixing clip Attention Never insert filled pipettes due to risk of contami nation and infection Wear protective gloves Aspiration of liquid Press control button until the liquid has been aspirated Re lease the control button to stop aspiration For controlled aspiration of excess liquids the aspiration speed can be regulated by using the integrated control but ton Small amounts of liquids can be taken up manually by using the thumb wheel and then sucked into the collecting bottle Working at different work places Disconnect bottle VTC with VacuuHandControl VHC from the inlet of the pump The bottle VTC is portable If the aspira tion effect ceases connect VTC to the diaphragm pump for a short time until the pump is switched
43. vacuubrand Technology for Vacuum Systems Instructions for use BVC 01 BVC 21 NT BVC 21 NT VARIO BioChem VacuuCenter Documents are only to be used and distributed completely and unchanged It is strictly the users responsibility to check carefully the validity of this document with respect to his product Manual no 999157 10 12 2009 page 2 of 31 Dear customer Your VACUUBRAND diaphragm pumps should support you for a long time without trouble and with maximal power Thanks to our long practical experience we have much information how you could en sure powerful application and personal safety Please read these instructions for use before the initial operation of your pump VACUUBRAND diaphragm pumps are the result of many years of experience in construction and prac tical operation of these pumps combined with the latest developments in material and manufacturing technology Our quality maxim is the zero fault principle Every diaphragm pump leaving our company is tested intensively including an endurance run of 18 hours Therefore also faults which occur rarely are identified and can be eliminated immediately The achievement of the specifications after the endurance run is tested for every pump Every VACUUBRAND pump achieves the specifications We feel obliged to this high quality standard We know that the vacuum pump can not take a part of your real work and hope that our products con tribute to an effe
44. validity of this document with respect to his product Manual no 999157 10 12 2009 NOTICE page 7 of 31 e Use the system only in combination with the integrated hydrophobic filter steriliz able to protect pump and environment people e Comply with applicable regulations when disposing of chemicals Take into con sideration that chemicals may be polluted Take adequate precautions to protect people from the effects of dangerous substances chemicals thermal decompo sition products of fluoroelastomers wear appropriate safety clothing and safety glasses e Never operate a defective or damaged device e Check the collecting bottle regularly for fissures Do never use a collecting bottle with fissures nor expose it to vacuum e Use only OEM spare parts and accessories Otherwise safety and perform ance of the equipment as well as the electromagnetic compatibility of the equip ment might be reduced Possibly the CE mark or the cTUVus mark see rating plate become void if not using OEM spare parts Ensure that in case of failure the system always will turn into a safe status Provide appropriate protective measures i e precautions which allow for the requirements of the respective application even for the case of failure and malfunction Operating the pump stand still of the pump or venting must not lead to a critical dangerous situation under any circumstances Electronic equipment is never 100 fail safe This may lead to
45. witching gt 5 switch points per minute of the vacuum pump e g due to air intake BVC 21 NT VARIO The vacuum inside the collecting bottle can be controlled with the adjusting knob VACUUM at the front of the device When turning the knob to the left more vacuum the diaphragm pump provides a lower pressure inside the collecting bottle The suction power is increased If the adjusting knob is turned to the right less vacuum the pump provides less vacuum inside the bottle The speed of the pump is adapted via an internal control to the respective vacuum demand There is no abrupt switching of the pump If the demanded vacuum level inside the bottle is reached the pump reduces its speed down to standstill Attention If the adjusting knob is turned completely to the left or close to the stop at the left in direction more vacuum the vacuum demand might be below the ultimate vacuum of the diaphragm pump Thus the pump will run continuously at highest speed To avoid this mode of operation reduce the vacuum demand slightly The vacuum pump will then reduce its speed automatically down to standstill once the ultimate vacuum is reached The aspiration system doesn t feature an air admittance valve l e if the collect ing bottle is under vacuum and the vacuum demand is reduced turning the adjust ing knob to the right the existing underpressure inside the bottle remains until the vacuum is reduced by further a
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