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23

BÜCHI 

Vacuum Controller

 B-720

9 Appendix

9.1 Technical data

Voltage

230 V / 50 … 60 Hz
120 V / 50… 60 Hz

Power consumption

14 W

Solenoid valve input

28 VDC

Control range pressure

1 mbar / Torr –  atmospheric pressure

Max. system deviation

± 0,5 % full scale

Pressure range

1 – 1400 mbar

1 – 1050 Torr

Hysteresis

Automatic or 1 – 100 mbar

Fuses

400 mAT

Dimensions (W x H x D)

90 x 145 x 55  mm

Weight

960 g

Ambient temperature

+ 5 °C …+ 40 °C

Table 10: Technical data

9.2 Materials used

Part

Material

Material code

Case

Grillamide

PA

Pressure sensor

Ceramic

Faceplate Foil

Polyester

Circuit board

Glass fibre epoxy resin

Cable

Polyvinyl chloride

PVC

Table 11: Material used

9 Appendix

Summary of Contents for B-720

Page 1: ...ative to read these notes in order to operate the Vacuum Controller safely Contents are subject to change without prior notice No part of these operating instructions may be reproduced in any form or...

Page 2: ...ories Water jet pump B 764 complete 31358 Water jet pump B 767 complete with 31357 cooling valve Cooling water valve complete 31356 Two way solenoid valves 24 VDC Type for 1 liter Rotavapor 31353 Type...

Page 3: ...about hazards which can lead to extensive material damage or cause serious or potentially fatal injury Warning Information about hazards which can be harmful to your health or lead to material damage...

Page 4: ...It is imperative to wear personal safety items such asgoggles protective clothing and gloves These operating instructions are to be considered part of the B 720 Vacuum Controller They must always be...

Page 5: ...e also used for purging with inert gas a cross clamp for mounting on a stand and a GL14 hose connector for connecting the vacuum hose Figure 4 The keypad on the B 720 3 1 Functions of the various keys...

Page 6: ...e 3 Function The automatic hysteresis function works by continuous linear degression 30 mbar for a desired value of 1000 mbar 1 mbar for a desired value of 2 mbar Example Nominal pressure 400 mbar aut...

Page 7: ...that the voltage of the power supply corresponds to the value marked on the B 720 rating plate Figure 7 The right hand side of the B 720 housing V Valve connection CW Cooling water valve connection P...

Page 8: ...e condenser Water faucet Woulff bottle trap Needle valve Cooling water valve Vacuum pump Two way valve 4 2 Installation with a two way valve and a cooling water valve 4 Putting into operation Figure 8...

Page 9: ...outlet Plug the vacuum pump into the B 745 with the power cable Place the non return valve in the vacuum line leading to the woulff bottle trap Plug the connecting cable from the B 745 into the socket...

Page 10: ...START Stop the distillation process STOP Figure 12 The membrane keypad on the B 720 The unit is not splash proof 5 2 Normal operation 1 Set the power switch to ON 2 Use P with UP or DOWN to select an...

Page 11: ...y which can be varied with UP and DOWN keys 1 100 mbar and A HA Automatic hysteresis i e 30 mbar at 1000 mbar infinitely reducible to 1mbar at 2 mbar pressure If no entry is made within 3 sec the disp...

Page 12: ...ystem pressure START 957 Distillation is started 147 current system pressure UP 387 The evacuation process is interrupted and the LED of START current system pressure flashes Hold state Keep key depre...

Page 13: ...P 2 x 957 Press STOP twice for the cooling water to switch off briefly current system pressure immediately Table 6 Working example UP Current system pressure System is ventilated for as long as the ke...

Page 14: ...24 375 Dioxane C4 H8 O2 88 1 406 101 1 034 107 DMF Dimethylformamide C3 H7 NO 73 1 153 0 949 11 Ethanol C2 H6 O 46 0 879 79 0 789 175 Ethyl acetat C4 H8 O2 88 1 394 77 0 900 240 Heptane C7 H16 100 2 3...

Page 15: ...customer service technicians are permitted to intervene service the Vacuum Controller B 720 They have undergone thorough professional training and are familiar with the hazards that ensue from ignori...

Page 16: ...ction Possible cause Remedy Valve opens and closes at high rate System has a leak Check all sealing points Hysteresis too small Select higher hysteresis value Valve does not open or close Valve does n...

Page 17: ...ing out of operation 7 1 Storage Transportation The unit should be stored in a dry place in its original packaging Material codes are marked on each large component Please observe your regional and lo...

Page 18: ...s of replacement parts and accessories is permitted only with the express consent of B chi The replacement parts catalog may be used only in conjunction with Chapter 5 of these instructions for instal...

Page 19: ...19 B CHI Vacuum Controller B 720 Cooling water valve 31356 B 767 Water jet pump 31357 Figure 16 B 767 Water jet pump Figure 17 Cooling water valve 8 Replacement parts...

Page 20: ...Rotavapor Two way valve 24 VDC 31354 12 mm for 20 liter Rotavapor Two way valve 24 VDC 31353 8 mm for 1 liter Rotavapor Figure 19 Two way valve for 20 liter Rotavapor Figure 18 Two way valve for 1 lit...

Page 21: ...e non return valve incl B chi Switch box B 745 CH 36410 Connecting cable non return valve incl Figure 21 Switch box B 745 CH B chi Switch box B 745 International 36412 Connecting cable non return valv...

Page 22: ...x 8 Alternative to the vacuum hose 17622 04113 Figure 25 Vacuum hose Bottle clamp 100 mm 11152 Figure 27 Bottle clamp 100 mm Woulff bottle trap PLASTIC GLAS complete 25519 Figure 26 Woulff bottle tra...

Page 23: ...tion 0 5 full scale Pressure range 1 1400 mbar 1 1050 Torr Hysteresis Automatic or 1 100 mbar Fuses 400 mAT Dimensions WxHxD 90 x 145 x 55 mm Weight 960 g Ambient temperature 5 C 40 C Table 10 Technic...

Page 24: ...rements for electrical equipment for mesurement control an laboratory use General requirements EN 55011 1991 B VDE 0875 B VDE 0871 B Limits and methods of measurement of radio disturbance characterist...

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