© Edwards Limited 2007. All rights reserved. Page 35
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Maintenance
B344-21-880 Issue N
5Maintenance
5.1 Safety
z A suitably trained and supervised technician must maintain the pump.
z Ensure that the maintenance technician is familiar with the safety precautions which relate to the products
handled by the pumping system. Wear the appropriate safety-clothing when you come into contact with
contaminated components. Dismantle and clean contaminated components inside a fume-cupboard.
z Isolate the pump from the electrical supply and your vacuum system before you start work.
z Allow the pump to cool to a safe temperature before you start work: Leave Diffstak 63/150, 100/300 and
160/700 pumps for at least 20 minutes; leave Diffstak 250/2000 pumps for at least 45 minutes. Open the
pump to atmospheric pressure when it is cool.
z Do not remove the dipstick or open the drain-plug to vent the pump while the pump is operating or under
vacuum.
z Use suitable lifting equipment when you move the pump.
z The pump and its fluid will be contaminated with the process chemicals that have been pumped during
operation. Ensure that you take adequate precautions to protect people from the effects of dangerous
substances if contamination has occurred.
z Do not touch or inhale the thermal breakdown products of fluorinated materials (for example, VITON) which
may be present if the pump has been heated to 310
o
C and above. These breakdown products are very
dangerous. The Diffstak pump may have overheated if the pump has been misused or if it has malfunctioned.
Edwards Material Safety Data Sheets for the fluorinated materials used in the Diffstak pump are available on
request.
z Do not use abrasive or reactive chemical substances to clean the pump.
z Do not use solvents to clean ‘O’ rings. Do not reuse ‘O’ rings or Co-Seals if they are damaged.
z Take care to protect sealing-faces from damage.
z Leak-test the system after maintenance is complete and seal any leaks found.
Obey the safety instructions given below and take note of appropriate precautions. If you do not,
you can cause injury to people and damage to equipment.
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