ProMinent Sigma 3 Basic Operating Instructions Manual page 60

Carrying out repairs
60
3. Check whether it can move freely in the hole.
4. Refit 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.
3. Press the piston on the other side of the diaphragm rupture sensor
with a blunt, smooth object into the dosing head (approximately 4
mm) until it triggers.
CAUTION!
Feed chemical may escape
If the expandable flap of the diaphragm is dam‐
aged, then feed chemical can escape when there
is a diaphragm rupture.
The piston must not be scratched, it must remain
completely smooth so that during operation it does
not damage the expandable flap of the diaphragm.
4. Press the red cylinder into the diaphragm rupture sensor again and
repeat the test.
5. If it does not trigger both times, replace the membrane rupture
sensor.
6. After a successful test, screw the transparent cover onto the dia‐
phragm rupture sensor and then continue at the top by fitting the
diaphragm.
Electrical diaphragm rupture sensor
1. Press the piston of the diaphragm rupture sensor with a blunt,
smooth object into the dosing head (approximately 4 mm) until the
monitor triggers alarm.
CAUTION!
Feed chemical may escape
If the expandable flap of the diaphragm is dam‐
aged, then feed chemical can escape when there
is a diaphragm rupture.
The piston must not be scratched, it must remain
completely smooth so that during operation it does
not damage the expandable flap of the diaphragm.
2. Repeat the test.
3. If the monitor does not trigger an alarm both times, replace the
membrane rupture sensor.
4. After a successful test, continue at the top by fitting the diaphragm.