Diaphragm Vacuum Pumps UN012, UN024, UN036_I
Operation
8
4. Operation
Specific safety instructions for the media being handled must
be observed.
DANGER
If combustible media are used:
Hazard of fires and explosions due to excessively
high media temperature
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Be aware that the pumps are not designed to be
explosion-proof.
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Make sure the temperature of the medium is
always sufficiently below the ignition temperature
of the medium, to avoid ignition or explosion.
This also applies for unusual operational
situations.
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Note that the temperature of the medium
increases when the pump compresses the
medium.
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Hence, make sure the temperature of the
medium is sufficiently below the ignition
temperature of the medium, even when it is
compressed to the maximum permissible
operating pressure of the pump.
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The maximum permissible operating pressure of
the pump is stated in the technical specifications
(section 9).
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If necessary, consider any external sources of
energy, such as radiation, that may add heat to
the medium.
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In case of doubt, consult the KNF customer
service.
Before pumping a medium, the compatibility of materials of pump
head, diaphragm and valves with the medium must be checked (for
pump materials: see section 9).
The pump must not start against pressure or vacuum. When it is
switched on the pressure in the suction and pressure lines must be
atmospheric. This must be so even when the pump restarts after
the power has been cut off for a short period.
The maximum permissible operating pressure (see section 9) must
not be exceeded.
To prevent the maximum permissible operating pressure being
exceeded, restriction or control of the air or gas flow should only be
carried out in the suction line.
If restriction or control of the air or gas flow is made on the
pressure side ensure that the maximum permissible operating
pressure is not exceeded.
