BUCHI Vacuum Pump V-710 - Manual (Page 46)

7 Maintenance and repairs
46 V-700/710 Operation Manual, Version E
• When all replacement work is done, reas-
semble the pump head in the reverse order.
NOTE
When remounting the valve head, fix the four
screws slightly at first, and then tighten them
crosswise (recommended torque 5.5 Nm).
Fig. 7.2: Disassembling and reassembling the valve heads
7 .5 Working with strong acids
ATTENTION
Always wear personal protective equipment such as protective eye goggles, protective clothing and
gloves when operating the instruments with strong acids or bases.
In case you distill strong acids or bases, we recommend highly that you rinse the pump after the distil-
lation process to increase the lifetime of the instrument.
To rinse the pump, proceed as follows:
• Suck 5–10 ml of water through the pump inlet and recollect it again directly behind the pump
outlet.
• Check the pH value of the water leaving the pump and repeat the rinsing procedure until the value
is between a pH of 3–9.
• Now dry the pump by sucking air through it for 2–3 minutes.
7 .6 Customer service
Only authorised service personnel are allowed to perform repair work on the instrument. These
persons have a comprehensive technical training and knowledge of possible dangers which might
arise from the instrument.
Addresses of official BUCHI customer service offices are given on the BUCHI website under:
www.buchi.com. If malfunctions occur on your instrument or you have technical questions or applica-
tion problems, contact one of these offices.
The customer service offers the following:
• Spare part delivery
• Repairs
• Technical advice