Service Manual VAP 20/30/40
Contents
1. to pressure sensor cooling water to micro switch tube clamp device to Steam rear cover to generator front aa module PCB ground connection VAP 40 TT 210 200 330 140 Steam Generator VAP 20 30 30 320 new sensor Part No 40857 since 12 95 330 515 i 500 505 350 500 530 890 Modification 11 08 1995 Page 2 feno SS Together with the changement of the level sensor also the steam generator has been changed Under the same Part No 40850 now only the new steam generator will be delievered Date Drawing No Part No Key to steam generator VAP 20 30 40 Description Modif 1 Modif 2 Modif 3 Modif 4 140 40863 Level sensor 11 08 95 302. UC lt G rear cover to PN B E T C b DC EU EZ 20278050 4 o 9 E V z GE 5 mn 0020 Eo O O BH o ground connection module VAP 20 30 PCB Date Drawing No Part No Key to PCB module VAP 20 30 40 Description Modif 1 Modif 2 Modif 3 Modif 4 11222 Control PCB VAP 20 30 11225 Control PCB VAP 40 11223 Power PCB 230 V VAP 20 30 40 11227 Display VAP 40 11213 Keyboard VAP 20 11214 Keyboard VAP 30 11215 Keyboard VAP 40 11750 Switch green illuminated 15350 Semiconductor relay WG A5 6D25 15351 Cap for 15350 14401 Plug connection 161 5 for mains cable 21417 Fuse holder 16 A 21420 Bayonet type cap for fuse 5x20 for 21417 12703 Socket with byonet catch 3 pin 18690 Plug housing 021 032 660 17916 Clamp fitting for tube at pressure sensor 20 40 12 10 11 7
3. VAP 20 40 power PCB P1 sensor PCB ground boiler Modification beginning with series numbers VAP 20 230 V 240 V VAP 30 230 V 240 V VAP 40 230 V VAP 000279 VAP 000180 VAP 000361 VAP 000173 VAP 000346 Modification 27 09 1995 As adaptor for the outlet of the steam generator a connection piece part no 17915 and a silicone tubing 6x10 mm lenght 45 mm part no 20903 are used to connect the Neoprene tubing 20919 Of the original Neoprene tubing you have to cut off 45 mm Old version New version Neoprene 20919 Connector 17915 Neoprene tubing Silicone 20903 oteam generator oteam generator Modification beginning with series numbers VAP 20 230 V VAP 000294 240 V VAP 000180 VAP 30 230 V VAP 000379 240 V VAP 000173 VAP 40 230 V VAP 000349 Modification 15 12 1995 Diaphragm pump 10310 NaOH Only acid resistant version The valve plates made of stainless steel 10328 are replaced by valve plates made of PIFE No 10327 see 6 Already modified pumps get the part no 10311
4. 2010220 1120 230 20 450 Front View VAP 20 30 40 Date Key to Front view VAP 20 30 40 Drawing No Part No Description Modif 1 Modif 2 Modif 3 Modif 4 10 50014 Case C G yellow 20 50015 Drip tray PP VAP 20 40 50 50018 Holder VK DK VAP 20 40 51 50020 Clamp fitting for 50018 80 50003 Quick clamping device for sample tube compl 50012 Wedge PP 13308 Switch for clamping device 200 7472 Distribution head glass 210 6470 Viton cone 220 7673 Distillation condenser 230 6474 Ventilation valve PP for distillation condenser 240 16604 Screw cap GL 32 open 241 16607 oilicone seal GL 32 250 16602 Screw cap GL 18 251 16606 oilicone seal GL 18 260 16601 ocrew cap GL 14 261 16609 Silicone seal GL 14 with tubing connection 270 30698 PTFE sieve for steam inlet tube 280 11810 PTFE inlet tubing steam 290 11811 PTFE inlet tubing NaOH 300 50021 Distance piece for distribution head 310 40234 Tubing holder for H3BO3 311 25102 Dummy plug for 8mm hole 320 19015 Plexiglass protection door bottom 02 05 96 330 19016 Plexiglass protection door top 02 05 96 340 18250 Door hinges 02 05 96 350 18251 Door handle 380 17542 PP tube joint 440 17940 Rubber foot 5mm 450 17945 Rubber foot GF 21 self adhesive 580 18404 Cable binder 1100 22 05 Silicone tubing 8 16 1120 20903 S
5. Devarda for VAP 20 30 40 Part No Description Modif 1 Modif 2 Modif 3 7474 PP distribution head Devarda VPD 7 bottom instead of 7472 7475 Distribution head Devarda glass VGD 7 top instead of 7472 30244 Ventilation valve for condenser glass 7676 Condenser shortened instead of 7673 40213 PP adaptor 50025 PP distance piece for distribution head instead of 50021 16604 Screw cap GL 32 open 16607 Silicone seal GL 32 Date Part No Modification kit Bi dist for VAP 20 30 40 Description Modif 1 Modif 2 Modif 3 90027 Holder for customer s Bi Dist installation 50026 Rear cover C G instead of 50019 17103 Magnetic valve without pressure control 17110 Flow control for cooling water MR 05 40231 Sample outlet PP transparent 17908 Clamp VZ 12 22 9 17907 Clamp VZ 8 7 VAP 30 40 25121 Cap Heyco d 22 5mm 25122 Cap Heyco d 34 8mm VAP 20 11140 Multiple contact strip 18424 SES Markers S 9 J 5 18560 PC Label 67x72 Caution Before opening rear cover 18564 PC Label 18x36 Water outlet 18565 PC Label 22x41 Pump NaOH 18566 PC Label 18x79 Excess temperature device 18567 PC Label 18x78 Excess pressure outlet 18568 PC Label 32x50 Cooling water inlet with sieve 18569 PC Label 32x50 Pump H20 steam
6. With the new Vapodest 20 30 it is possible to exchange the Control PCB from a Vap 20 to a VAP 30 In case of a service it will now be easier to have the right PCB on stock because now it does not matter any longer if the PCB is for a VAP 20 or for a VAP 30 The software will check which keyboard is present and then the processor will adapt the PCB In order to ensure that the software will work after the replacement of the Control PCB it is necessary to press PROG and RESET at the same time and to switch on the instrument while still pressing the keys Gerhard Modification 16 03 1995 Draw No 1120 Part No 20903 The tubing with part no 20903 is shortened to a length of 150 mm When installing the shortened tubing the angle has to be adjusted to the angle of the condenser outlet er n angle of tubing Modification beginning with series numbers VAP 20 trom VAP 000233 VAP 30 from V AP 000182 Gerha Modification 1 from 30 03 1995 Draw No 1150 Part No 20920 only VAP 30 40 The silicone tubing part no 20914 from pump H2O to PP distributor is replaced against Verprene tubing Part No 20920 Additionally there 1s clamp Part No 17907 used It fixes the new tubing to the PP distributor Modification beginning with series numbers VAP 20 from VAP 000242 VAP 30 from VAP 000183 Gerha Modification 2 from 30 03 1995 Only diaphragm pump NaOH Part No 10310 The PVC tubing bet
7. connect an instrument to measure the current the instrument draws into the mains circuit to steam valve bar e to pressure sensor TM steam generator H2O steam generator gt Switch on the Vapodest The electronics measures the level of water inside the steam generator and if necessary the pump for H2O will run When a sufficient water level is reached the heating element is switched on When the pressure inside the steam generator begins to increase the ventilation valve will close and the pressure is able to increase more and more because of the disconnected pressure sensor Observe carefully the increasing pressure and make a note at which pressure the excess pressure valve opens In case that the valve does not open at a pressure of about 0 5 bar immediately switch off the instrument 8 3 5 8 4 Excess pressure valve has to open earlier lower pressure Remove the brass cap and slightly loosen the big nut Turn the adjusting screw slightly anti clockwise and tighten the nut very well Take care that the adjusting screw stays in the adjusted position When the adjustment is done repeat the above described procedure to test the excess pressure valve Excess pressure valve has to open later higher pressure Remove the brass cap and slightly loosen the big nut Turn the adjusting screw slightly clockwise and lock the nut very well Take care that the adjusting screw stays in the adjusted position When the a
8. eI c Gerhardt Service Manual VAP 20 30 40 1 General notes for users of the Service Manual VAP 20 30 40 This manual was written exclusive for the service staff of C Gerhardt GmbH amp Co KG and for the service staffs of our international agencies This service manual shall help to get a deeper knowledge of how the instruments are constructed and how they work It is an Important tool to service and repair the instruments in a safe competent and specific way The transparent structure and the appendix of modification information will enable to order and to store the most useful spare parts This manual will make servicing easier in particular for our international agencies To provide yourself against risks during operation or service the following safety instructions should be obeyed Make sure that no liquid gets into contact with cable connections or the interior of the electrical parts of the unit Danger of electrical shock Repairs on electrical electronic or mechanical parts must only be done by authorzied personnel Always switch off the apparatus at the mains and pull the plug before opening Danger of electrical shock The apparatus must be used according to the instruction manual It is not allowed to make changes to the apparatus in order to modify its application gt Pe 200 290 300 241240 280 380 261 260 5801100 50 311 10 440
9. 0 21115 Multitherm 550 HD 400x500x3mm 320 20604 Excess pressure valve 604T 330 20620 SKT Ventilation valve 340 12354 Tubular heating element 230 V 350 12307 Excess temperature device 400 18 87 Plug in connection piece label for ground connection 890 18691 Plug 020 030 660 ah N gt Art Nr 10329 J DUN M2 M B Z O ai Y LN oF T lt N U Diaphragm Pump K 10310 Spare parts for diaphragm pump 10310 1 Pump head comprising of the following parts Part No Drawing No Description Quantity 10330 F X Coverofpumphead 0 1 10325 D Comneciionvpiece for square connections 1 103222 B Distancepiece 1 0 0 Clamp for valve ules 17911 Angle connectionfinlet 17910 JAngeconnection oulet 103221 Z JjDiaphragmwihlipandscrew Attention In instruments Vap 20 30 40 there are different angle connections for the pump NaOH Angle connections Part No 17911 and 17910 are replaced against the following connections 10317 10318 PP angle connection NaOH outlet PP angle connection NaOH inlet LX MEE NNNM NN NE 20918 Isoversinic tubing Bi M 1 For pumps H2O Part No 17911 and 17910 are valid 2 Ot
10. 455 27309 Silicone red 15x80x5 base for Steam Generator 456 2 310 Silicone red 15x15x3 base for Steam Generator 480 18411 Guiding spout 486 25121 Cap Heyco d 22 5mm 490 17914 Band clamp fitting OBO Quick PG 21 520 17920 Clamp 12H8074 600 23230 Set screw VA M4x30 DIN 551 610 23002 Label for ground connection M4 9x18 Al 1110 20914 Silicone tubing 4x7 from pump H2O to 50024 1150 20920 Verprene tubing 4x8 30 03 95 1160 20921 Verprene tubing 8x12 1170 20919 Neoprene tubing 4 8x1 6 approx 170mm and 520mm 980 800 to steam generator rear 7 fh L T FS lt Sha gt to A GEN i 100 d P Eun 690 Dita KS DS 660 iba 100 i J E u E gt to 50024 Lo S Ni to connection 4 P 51x10x5 680 110 410 700 400 Pump Holding Module VAP 20 30 40 Date Drawing No Part No Key to pump holding module VAP 20 30 40 Description Modif 1 Modif 2 Modif 3 Modif 4 30 50016 Pump holding module VAP 20 40 100 10310 Diaphragm pump PML 1140 ND100 30 03 95 15 12 95 110 10360 Peristaltic pump SR25 230 V 290 11811 PTFE inlet tubing NaOH 400 10318 PP connection bent DN 08 R 1 8 410 10317 PP connection bent DN 06 R 1 8 480 18411 Guidin
11. AP 20 30 The same values are valid 8 3 2 8 3 3 Excess temperature device The adjustment of the excess temperature device should not be changed lt has been adjusted here at C Gerhardt so that an excess temperature of about 150 C will open the heating circuit This device is directly switched into the the 230 V circuit A damaged excess temperature device should not be bridged but replaced immediately Pressure sensor The pressure sensor is maintenance free In case of problems with pressure measuring or in case of a broken pressure sensor the complete Control PCB has to be changed see 10 The way to measure the pressure inside the steam generator is as follows VAP 20 30 When the Vapodest is still cold a gauge for pressure measurement 0 1 bar has to be connected into the line from steam generator to pressure sensor as the schematics shows If available connect an instrument to measure the current the instrument draws into the mains circuit Switch on the Vapodest The electronics will measure the level of water inside the steam generator and if necessary the pump for H20 will run Then the heating element is switched on When the pressure inside the steam generator begins to increase the ventilation valve will close and the pressure of about 0 2 bar will build up The instruments switches into stand by and indicates that it is ready for distillation If the instrument goes into stand by well below or well above
12. ar heating element will be switched off in case of a level decreasing under the allowed minimum range The level sensor can only compare between insufficient or sufficient water inside the steam generator This is done by changing the frequency it sends to the Control PCB Excess temperature device In case that due to a total failure of the level sensor and the control electronics lack of water in the steam generator cannot be detected the tubular heating element must be protected against overheating In such a case the excess temperature device will switch off the heating circuit at about 150 C After trouble shooting and cooling off of the steam generator the pin of the excess temperature device has to be pressed back into position Now the next distillation can be started Pressure sensor The pressure sensor is placed directly on the Control PCB and continuously checks the pressure inside the steam generator If this sensor detects a higher pressure than 0 45 bar the tubular heating element is switched off and the instrument gives an error message Excess pressure valve In case of a total failure of pressure sensor and control electronics the instrument must be protected against an increasing pressure At about 0 5 bar the excess pressure valve will open mechanically so that any damage of the instrument can definitely be avoided If this happens the instrument has to be switched off immediately Micro switch for sample tube This s
13. can also pass through the PP distributor until it reaches the pump for sample suction Steam will also pass through the tubing for the dilution of the sample until it reaches the non return valve of the pump for H2O sample a Way of steam during stand by Steam Generator b Way of steam during distillation Steam Generator 1 Shut off valve 4 PP connector 2 Ventilation glass 5 Inlet tube steam 3 Steam valve 6 Tubing H2O sample 7 Tubing suctioning Sample suction After the distillation the steam valve will not draw current any longer and it closes the path to the ventilation glass For suctioning now the shut off valve will get alive and it closes the tubing too Consequently the pump for sample suctioning is able to empty the sample tube In this case the ventilation valve of the condenser must open If not the pump will also empty the receiver The pump for sample suction also draws against the pump for sample dilution Steam Generator gt 8 Pump suctioning 9 Pump H2O sample sam_i_dube 9 1 Diaphragm pump The diaphragm pumps used in VAPODEST instruments are almost maintenance free Depending on the kind of liquid the volume the pumps deliver is about 100ml 10 s Make sure that the tanks are not placed in a higher position than the instrument itself It may occur that the volume becomes less than the normal range because of dirt deposit inside the pump housing In this case the pump and
14. djustment is done repeat the above described procedure to test the excess pressure valve When measuring the pressure it is important to make sure that all tubing connections are fixed properly Carefully observe the increasing pressure and make sure you do not touch the hot excess pressure valve The connections should only be opened when the instrument has cooled down Risk of scalding because of hot steam of more than 100 C Micro switch for sample tube This switch prevents the start of a distillation without any sample tube Without a tube the switch is activated which means that the circuit is open With a sample tube the switch is not activated and the circuit is closed The switch is located inside the instrument directly fixed on the clamping device for the sample tube General description of steam inlet sample suction Steam inlet During stand by steam of about 0 2 bar only reach the steam valve During stand by both valves steam valve and shut off valve are dead After starting a distillation the steam valve gets alive which means it will open The ventilation valve however still stays dead so that it is open for steam The steam now can pass through the steam valve ventilation glass shut off valve PP distributor and steam inlet tubing into the sample tube From there the distillate will pass through the distribution head and the condenser into the receiver The ventilation valve of the condenser must be closed The steam
15. ects sufficient water inside the steam generator This will take some seconds Then the semiconductor relay switches on the tubular heating element with maximum power to reach the necessary steam pressure for the distillation When this pressure is reached the maximum heating power is switched off and the instrument reverts to stand by with a regulated and controlled heating The instrument now is ready for distillation When starting a distillation the instrument will heat with a selected power from 30 100 VAP 20 30 or 40 100 VAP 40 The steam will reach the sample tube via pinch solenoid valve s ventilation glass PP distributor and steam inlet tube During this procedure the level inside the steam generator will decrease This is recognized by the level sensor and the pump H20 for the filling of the steam generator will be switched on If there is no sample tube present or if the tap for cooling water is not open a distillation is not possible Remark Especially if the water for the steam generator is not very clean or if there any kind of dirt within the reservoir the following problem may occur After some distillations the instrument shows the error message E3 no water for steam generator and the program stops After pressing RUN the display shows H wait for steam Explanation If the steam generator is contaminated with dirt the boiling and bubbling water will build up foam above the water level The
16. g spout 5 0 22 01 Clamp VZ N10 660 18421 SES Markers S 9 J 2 680 18423 SES Markers S 9 J 4 690 17424 SES Markers S 9 J 5 18425 SES Markers S 9 J 6 11140 Multiple contact strip 20050 Insulation tube sw 6x0 5 20072 Insulation tube sw 5x0 5 to sample tube clamp RARO LA bo N O SS SE l to peristaltic pump pressure N amp ni Re R 430 Q to condenser 1100 40 510 500 1150 Tubing Connection Module VAP 20 30 40 Date Drawing No Part No Key to tubing connection module VAP 20 30 40 Description Remark Modif 1 Modif 2 Modif 3 40 90017 Tubing connection module VAP 20 40 150 17109 Magnetic valve with pressure control 0 5 bar 5 420 90022 Connection piece PP 51x10x10 430 90023 Connection piece PP 51x10x5 only VAP 30 40 485 25120 Cap Heyco d 15 1mm only VAP 20 900 17908 Band clamp fitting 510 17907 Band clamp fitting only VAP 30 40 800 11140 Multiple contact strip 990 17960 VA screw 1411 KA 50x25 22 05 Silicone tubing 8x16 20920 Verprene tubing 4x8 only VAP 30 40 20 10 11 to pressure sensor 40 u N 5 C gt ey Of oa LI
17. generator 18561 PC Label 32x50 Pump suction VAP 30 40 18562 PC Label 32x50 Pump H20 sample VAP 30 40 Date Other parts and accessories for VAP 20 30 40 Modification to PP distribution head Part No Description Quantity Modif 1 Modif 2 Modif 3 7482 PP distribution head VAP 20 instead of 7472 16 6 Distillation condenser VAP 20 instead of 7673 Modification to B chi Part No Description Quantity Modif 1 Modif 2 Modif 3 7483 Distribution head glass instead of 7472 1 Modification to micro Description Quantity Modif 3 Viton cone micro 1 Modification to acid restistant Part No Description Quantity Modif 1 Modif 2 Modif 3 instead of non return valve 10329 1 instead of PVC tubing at pump NaOH 45mm to fasten 20918 10327 Valve plate PTFE for pump NaOH 2 30244 Ventilation valve glass 20918 Isoversinic tubing 6x12 27101 Clamp VA 6 16 30 03 95 30 03 95 15 12 95 8 0 8 1 Steam Generator General description of steam generation After switching on the Vapodest the electronics measures the level of water inside the steam generator via the level sensor In case of a level below minimum the pump for H2O steam generator is switched on until the level sensor det
18. her spare parts are not available In case of damage customers only can order the complete pump 10310 Date Spare parts and accessories VAP 20 30 40 Part No Description Modif 1 Modif 2 Modif 3 18560 PC Label 67x72 Caution Before opening rear wall 18561 PC Label 32x50 Pump Suction VAP 30 40 18562 PC Label 32x50 Pump H20 sample VAP 30 40 18564 PC Label 18x36 Cooling water outlet 18565 PC Label 22x41 Pump NaOH 18566 PC Label 18x79 Excess temperature device 18567 PC Label 18x78 Excess pressure outlet 18568 PC Label 32x50 Cooling water inlet with sieve 18569 PC Label 32x50 Pump H20 steam generator 26926 PC Label 95x59 inside the instrument 26925 PC Label 130x98 rear of PCB module 22802 Water inlet tubing 10 17 2m 25450 PVC pipe 6x1 25451 PVC pipe 10x1 20921 Verprene tubing 8 12 for sample waste VAP 30 40 22601 PVC tubing 4 7 2m for pumps H2O dist 22604 PVC tubing 8 12 2m for tank NaOH and cooling water outlet 1311 Mains cable 2m 7629 Set of tanks KAN20 with level switch 7639 oet of tanks KAN30 with level switch 7649 Set of tanks KAN40 with level switch 6471 Viton cone VK micro for 100ml tubes KMT 4260 HS 232 485 ARS 4261 Data cable DK 42 for RS 485 2m 4262 Data cable DK 45 for RS 485 5m 4264 Data cable DK 22 for RS 232 2m 4265 Terminator AST Date Modification kit
19. ilicone tubing 6 10 16 03 95 2010 22 04 Silicone tubing 8 12 Page 1 10 370 to condenser 490 1160 400390 3604101110 998 520 Rear View VAP 20 30 40 1631621 170160162 Date Key to Rear View VAP 20 30 40 Drawing No Part No Description Modif 1 Modif 2 Modif 3 Modif 4 10 50014 Case C G yellow 30 50016 Pump holding module VAP 20 40 see 4 1 40 50017 Tubing connection module VAP 20 40 see 4 2 60 50019 Hear cover VAP 20 40 C G yellow 70 40850 Steam Generator DE 94 see 4 5 11 08 95 27 09 95 80 50003 Quick clamping device for sample tube compl 81 13308 Switch Tube present 90 40890 PCB module 230 V VAP 20 compl see 4 3 40891 PCB module 230 V VAP 30 compl see 4 3 40892 PCB module 230 V VAP 40 compl see 4 4 160 10385 Pinch solenoid valve S 307 20 06 95 161 10389 Tube holding device for valve 10385 162 11003 Plug with bridge rectifier for valve 10385 163 40269 Ventilation vessel glass 20 06 95 290 11811 PTFE inlet tube NaOH 360 90024 PP connector 370 40249 Screw connection part 3 for 50024 385 40239 PP dummy plug for 50024 400 10318 PP connection bent DN 08 R 1 8 410 10317 PP connection bent DN R 1 8 430 50023 Tubing connection PP 51x10x5
20. level sensor detects the foam as water and prevents the pump from running even though the water level in the steam generator is not sufficient After some time the liquid level or the foam will have diminished to such an extent that no more liquid is detected and the system switches on the pump Within 15 s a sufficient water level should now be detected As this is not possible in such a short time the error E3 will appear on the display If the RUN key is now pressed the system will get into the filling mode and the steam generator will be filled to the height stipulated However at the same time due to the cold water the steam pressure collapses and the unit heats up again until stand by is reached Only now further distillations can be run So please note that a reaction as described is not a malfunction but a sign of unwanted foam in the steam generator If this happens clean the steam generator and the reservoir 8 2 8 2 1 8 2 2 8 2 3 8 2 4 8 2 5 Safety devices for steam generation 8 2 1 Level sensor 8 2 2 Excess temperature device 8 2 3 Pressure sensor 8 2 4 Excess pressure valve 8 2 5 Micro switch for sample tube Level sensor The level sensor constantly controlls and regulates the level of water inside the steam generator The sensor itself is constantly checked by the electronics in case of a malfunction the instrument will give an error message If the level detection system fails totally the tubul
21. than 0 2 bar the Control PCB has to be replaced see 10 When measuring the pressure it is important to make sure that all tubing connections are fixed properly The connections should only be loosened when the instrument has cooled down Risk of scalding because of hot steam of more than 100 C to steam valve lt to pressure sensor lt steam generator H2O steam 5 VAP 40 At instruments of the type Vapodest 40 the pressure can be checked with the inbuilt test program without opening the rear wall To enter the test program the keys and 9 have to be pressed at the same time The instrument shows the menu display for the I O test The pressure as measured by the pressure sensor can now be read To quit the test program the keys and Reset have to be pressed at the same time 8 3 4 Excess pressure valve The adjustment of the excess pressure valve should not be changed It has been adjusted here at C Gerhardt so that an excess pressure of about 0 5 bar will activate the valve The following instructions will help to adjust the excess pressure valve if it becomes necessary nevertheless When the Vapodest is still cold a gauge for pressure measurement 0 1 bar has to be connected to the steam generator as the schematics show The tubing to the pressure sensor is left without any connection to prevent the switching off of the heating when reaching a pressure of 0 2 bar If available
22. the valves inside the pump housing should be cleaned Cleaning the valves To clean the pump it is necessary to disconnect all the tubes and to remove the rear wall Loosen the 4 screws from the badly working pump and take away the cover of the pump head Also take away the connection piece for angle connections and the diaphragm Carefully loosen the clamp for the valve plates and the valve plates themselves Clean all the parts and re assemble the pump ensuring that all parts are put back into the right position Close the rear wall and do not forget the ground connection Install again all the tubings and let the instrument run to see if everthing works well L Clamp for valve tiles D Connection piece for square connections M1 M2 valve plates 9 2 Peristaltic pump Also the peristaltic pumps are maintenance free At least once a year the neoprene tubing should be replaced Remove inlet and outlet tube Twist s shaped bar on the left hand side of the pump Take out the plastic housing containing the tubing When fitting the new tubing ensure that the u shaped lugs locate in their recesses to fix the tube into the plastic housing The complete plastic housing is now inserted into the guides of the pump body before locking in position with the S bar S shaped bar plastic housing Description PartNo Guides for the pump body S shaped locking bar 0373 Replacement of the Control PCB
23. ween PP angle connection 10317 and the PVC non return valve 10329 is replaced against Isoversinic tubing part no 20918 The other diaphragm pumps are not modified Additionally there are 2 clamps Part No 27101 used to fix the new tubing on both ends Modification beginning with series numbers VAP 20 from V AP 000242 VAP 30 from VAP 000183 Gerha Modification 20 06 1995 Draw No 160 163 Part No 10385 40269 Due to modifications of the solenoid pinch valves the following kit is to be used for replacement Modification kit part no 2 760050 2 After modification ventilation glass part no 40269 is replaced by ventilation glass part no 40272 Part of modification kit Modification beginning with series numbers VAP 20 230 V VAP 000294 240 V VAP 000180 VAP 30 230 V VAP 000379 240 V VAP 000173 VAP 40 230 V VAP 000349 Gerha Modification 11 08 1995 As the technology of the new level sensors has changed they now have 4 contacts instead of 3 If you have to install one of the new sensors boilers into older instruments you will have problems with the connections at VAP 20 30 In order to do so you have to modify the cabling between the power PCB and sensor plug Depending on the cabling of the sensor there are two possible ways of modification Older version cabling white brown green P4 VAP 20 40 power PCB P1 sensor PCB ground boiler Newer version cabling blue brown black P4
24. witch ensures that a distillation is not run without a sample tube In case you try to start the system without a sample tube the start is prevented by the switch Thus there is no danger of scalding 8 3 8 3 1 Testing the safety devices for steam generation 8 3 1 Level sensor 8 3 2 Excess temperature device 8 3 3 Pressure sensor 8 2 4 Excess pressure valve 8 2 5 Micro switch for sample tube Level sensor With a filled steam generator a frequency lt 20 KHz should be measured With an empty steam generator a frequency gt 130 KHz should be measured Measurement of the frequencies VAP 20 30 To measure the frequency the gauge has to be connected to collection plug P4 at pins 2 3 P4 is to be found on the Power PCB above those orange coloured plugs The occupation of P4 is to be found in the circuit diagram see 4 2 KHz I ZE SE Measurement of frequency VAP 40 At instruments of the type Vapodest 40 the frequency can be checked with the inbuilt test program without opening the rear wall To enter the test program the keys and 9 have to be pressed at the same time The instrument shows the menu display for the I O Test and the frequency can be read filled steam generator H igh about 5 KHz empty steam generator L ow about 90 KHz To quit the test program the keys and Reset have to be pressed at the same time It is also possible to measure the frequency as in the description for V
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