6.4. Evacuate diaphragm’s innerspace and install
Danger of dangerous gas mixtures during operation
of the pump if the working diaphragm ruptures.
Depending on the medium being pumped, a rupture
of the working diaphragm may produce a potentially
dangerous mixture when the medium mixes with the
air in the innerspace between the working diaphragm
and the safety diaphragm.
Evacuate the innerspace between the working
diaphragm and the safety diaphragm (see posi-
tion 5 in Fig. 4, p. 12) through the two holes in
the pump head (thread size G1/8).
KNF recommends monitoring the pressure of the
evacuated innerspace between the working dia-
phragm and the safety diaphragm. Immediately
stop the pump if the pressure becomes elevated.
Immediately stop the pump if the working dia-
phragm ruptures. The working diaphragm and
the safety diaphragm must be replaced before
continuing with operation (see chapter 8,
Maintenance).
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