Operation
Diaphragm Pump N1200.12, N1400.1.2.12
26
Translation of Original operating and installation instruction, English, KNF 308930-308933 02/22
WARNING
Risk of pump head bursting due to excessive
pressure increase
à
Do not exceed the maximum permissible op-
erating pressure (see
à
Monitor the pressure during operation.
à
If the pressure exceeds the maximum permis-
sible operating pressure of the pump: immedi-
ately switch off the pump and remedy the fault
(see Chapter
à
Only throttle or regulate the air or gas quantity
on the suction line to prevent the maximum
permissible operating pressure from being ex-
ceeded.
à
If the air quantity or gas quantity on the pres-
sure line is throttled or regulated, make sure
that the maximum permissible operating pres-
sure at the pump is not exceeded.
à
Ensure that the pump outlet is not closed or
restricted.
Excessive pressure, with all of the associated hazards, can be pre-
vented by means of a bypass line with a pressure relief valve be-
tween the pressure side and suction side of the pump. Further infor-
mation is available from KNF Customer Service (contact data: see
www.knf.com).
WARNING
Risk of dangerous gas mixtures during pump op-
eration if the working diaphragm breaks
If the working diaphragm should break, the
medium will mix with the air in the innerspace be-
tween the working diaphragm and the safety di-
aphragm.
à
Immediately stop the pump if the working di-
aphragm breaks. Breakage of the working di-
aphragm can be detected by monitoring the
innerspace for a pressure change in the in-
nerspace between the working diaphragm and
the safety diaphragm. A change in the pres-
sure or flow rate of the pump without apparent
reason may also indicate breakage of the
working diaphragm.
à
Replace the working diaphragm and safety di-
aphragm prior to further operation (see Chap-
ter
Operation with open suction-side gas connection can result in con-
taminants and objects being drawn in.
Pump stoppage
à
When the pump is at a standstill, establish normal atmospheric pres-
sure in the lines.
Vapors as medium The service life of the diaphragm can be extended, if no condensate forms
in the pump. Therefore:
Summary of Contents for N1200.12
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