ProMinent Makro TZ Operating Instructions Manual page 17

ProMinent ®
Operation of the diaphragm rupture indicator (for TZMb)
The diaphragm rupture indicator monitors the soundness of the composite diaphragm. The
composite diaphragm combined with the diaphragm rupture sensor and switch make up the
diaphragm rupture indicator.
The composite diaphragm has an expandable position (4) on its bolt circle. If an outer layer of the
composite diaphragm ruptures, dosing medium under pressure penetrates into it and causes the
expandable position to bulge out (4). In so doing, it presses the pin (2) of the safety piston (1) on
to the diaphragm (3) of the diaphragm rupture indicator, so that a contact signal switches the
pump off or initiates an alarm signal (to be installed by the customer!).
The composite diaphragm also prevents any escape of the dosing medium if the diaphragm
ruptures.
1
2
3
4
Fig. 11: Operation of diaphragm rupture TZMb (the composite diaphragm is shown smaller)
Function description
4
1 Safety piston
2 Pin
3 Lens
4 Expandable position of
composite diaphragm
Page 17