Operation
Diaphragm Vacuum Pumps UN86_.16I
6
4. Operation
The pumps must not be used in areas where there is a danger of
explosion.
Specific safety instructions for the media being handled must be
observed.
If combustible media are used:
Hazard of fires and explosions due to excessively high
media temperature.
Be aware that the pumps are not designed to be
explosion-proof.
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.
Note that the temperature of the medium increases when
the pump compresses the medium.
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.
The maximum permissible operating pressure of the pump
is stated in the technical specifications (section 10).
If necessary, consider any external sources of energy,
such as radiation, that may add heat to the medium.
In case of doubt, consult the KNF customer service.
Before pumping a medium, the compatibility if material of pump
head, diaphragm and valves with the medium must be checked (for
pump material: see section 10).
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 10)
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 pres-
sure side ensure that the maximum permissible operating pressure
is not exceeded.
When the pump is at a standstill the inlet and outlet must be at
normal atmospheric pressure.
The pumps must not be used to produce vacuum and pressure at
the same time.
