B1305
Fig. 16: Screwing sequence
3.3.3 Checking the condition of the diaphragm rupture sensor
1.
Replace the diaphragm rupture sensor if its inside has become
damp or dirt has penetrated it.
7
6
5
4
3
2
1
P_SI_0020_SW
Fig. 17: Section through the Sigma diaphragm rupture warning system
("Visual rupture indicator" design)
1
Working layer (≙ operating diaphragm)
2
Safety layer (≙ safety diaphragm)
3
Flap
4
Piston
5
Diaphragm rupture sensor
6
Cylinder, red
7
Cover, transparent
2.
If the piston of the diaphragm rupture sensor - see , item 4 - should
become dirty or damp, clean both it and the hole in which it runs.
3.
Check whether it can move freely in the hole.
4.
Reassemble the clean diaphragm rupture sensor with the clean
piston.
5.
Test the diaphragm rupture sensor:
Optical diaphragm rupture sensor
1.
Unscrew the transparent cover from the diaphragm rupture sensor.
2.
Press the red cylinder into the diaphragm rupture sensor until it
engages.
Notes on cleaning metering pumps with hygienic pump head
27
