ProMinent EXtronic EXBb Operating Instructions Manual page 41

2. With the pump running, set the stroke length to "0" with the
stroke length control knob (14).
3. Switch off the pump.
4. Loosen the screws (24).
5. Pull dosing head (4) with screws (24) approx. 5 mm out of
backplate (3) and pump housing until no more resistance can
be felt through the screws (24) when attempting to turn the
dosing head (4).
6. Hold housing and backplate (3) in the left hand and use the
right hand to turn the dosing head (4) to the left in gentle
jerks such that the metering diaphragm (25) releases from
the drive axle.
7. Pull dosing head (4) with screws (24) from the diaphragm
(25).
8. Unscrew the metering diaphragm (25) completely from the
drive axle.
4 24 25
1. Check the thread's ease of movement by screwing on the
new metering diaphragm all the way up to the drive axle's
step and unscrewing it again.
CAUTION!
Only pump with diaphragm rupture sensor: replace
the additional diaphragm behind the backplate with
every second metering diaphragm or after 10,000
operating hours as well.
2. Place backplate (3) back on housing.
26 3
P_EX_0015_SW
Repair
41