VACUUBRAND PC 301 - Manual (Page 20)

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.: 999147 / 17/06/2014
page 20 of 40
Use and operation
Installing in a vacuum system
➨ If dangerous or polluting fluids could be released at the outlet, install an appropri-
ate system to catch and dispose of those fluids.
☞ Connect a gas-tight exhaust line at the pump outlet if necessary. Always vent
exhaust gases appropriately (e.g., into a fume hood).
☞ Never block the gas outlet. The exhaust line must always be free of obstructions
(no back pressure) to ensure an unimpeded discharge of gas. The cross-section
of the outlet tubing must be at least the size of the pump’s exhaust connection.
☞ Particles and dust must not be aspirated. If necessary, you must install appropri-
ate filters. You must ensure their suitability concerning gas flow, chemical resist-
ance and resistance to clogging prior to use.
☞ Make sure ventilation is adequate, especially if the pump is installed in an enclo-
sure, or if the ambient temperature is elevated. Provide external ventilation, if nec-
essary.
• Reduce the transmission of vibration. Prevent mechanical load due to rigid pipe-
lines. Insert elastic hoses or flexible elements as couplings between the pump
and rigid pipes. Note: Flexible elements will compress or flatten when evacuated
if not designed for use under vacuum.
• Hose connections at the pump inlet must always be gas tight.
• A power failure may cause accidental ventilation of the pump, especially if the
gas ballast valve is open. If this constitutes a potential source of danger, take ap-
propriate safety measures.
• Check the power source and the pump’s rating plate to be sure that the power
source and the equipment match in voltage, phase, and frequency.
Make sure ventilation is adequate to maintain recommended operating temperature.
Keep a minimum distance of 5 cm between the cooling fan and surrounding items
(e.g., housing, walls, etc.), or else install an external automatic ventilation system.
Use connecting hoses with large diameter and keep them as short as possible to
avoid flow losses. Locate the pump as closely as possible to the application.
Always install outlet tubing descending from the pump or provide other measures to
avoid backflow of condensate towards the pump.
Recommended: Close flow control diaphragm to isolate the pump from the vacuum
system to allow the pump to warm up before condensable vapours are pumped or to
clean the pump before it is switched off.
When assembling, ensure vacuum-tightness. After assembly, check the whole sys-
tem for leaks.
Secure hose connections at the pump appropriately, e.g., with hose clamps, to pro-
tect against accidental detachment.
To reduce pump noise emanating from the pump exhaust port, connect an exhaust
hose or use a silencer (see ”Accessories”).
Use the manual flow control diaphragm to control the pumping speed of the pump
and thus the pressure inside the vacuum application. Open the diaphragm: turn in
direction ”+”, pumping speed increases. Closing the diaphragm: turn in direction ”-”,
pumping speed is decreased.
NOTICE