Datasheet
Dust Handling of Vacuum Equipment
• When the vacuum equipment is used, not only the workpiece, but also dust in the surrounding environment is taken in the
equipment. Preventing the intrusion of dust is required more than for any other pneumatic equipment. Some of SMC’s
vacuum equipment comes with a filter, but when there is a large amount of dust, an additional filter must be installed.
• When vaporized materials such as oil or adhesive are sucked into the equipment, they accumulate inside, which may cause
problems.
• It is important to prevent dust from entering the vacuum equipment as much as possible.
(1) Make sure to keep the working environment and surrounding area of the workpiece clean so that dust will not be sucked
in the equipment.
(2) Check the amount and types of dust before using the equipment and install a filter, in the piping when necessary. In
particular, equipment used to capture dust, such as a vacuum cleaner, require a special filter.
(3) Conduct a test and make sure that operating conditions are cleared before using the equipment.
(4) Perform filter maintenance depending on the amount of dirt.
(5) Filter clogging generates a pressure difference between the adsorption and ejector parts. This requires attention, since
clogging can prevent proper adsorption from being achieved.
• To protect the switching valve and the ejector from becoming clogged, a suction filter in the vacuum circuit is recommended.
• When using an ejector in a dusty environment, the unit’s filter will become clogged quickly, so it is recommended that the ZFA, ZFB or ZFC
series be used concurrently.
Air Suction Filter (Series ZFA, ZFB, ZFC)
Determine the volume of the suction filter and the conductance of the switching valve in accordance with the maximum suction flow rate of the
ejector and the vacuum pump. Make sure that the conductance is greater than the value that has been obtained through the formula given
below. (If the devices are connected in series in the vacuum line, their conductances must be combined.)
Vacuum Line Equipment Selection
Qmax: Max. suction flow rate L/min (ANR)
5 x 11.1
C = C: Conductance [dm
3
/(s·bar)]
Qmax
Model Selection
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