Operating instructions

ProMinent

Page 17

Fig. 11: Operation of diaphragm rupture TZMb (the composite diaphragm is shown smaller)

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.

Function description

1 Safety piston

2 Pin

3 Lens

4 Expandable position of

composite diaphragm

BA_MA_TZ_006_10_06_GB.p65 05.02.2007, 13:41 Uhr17