ProMinent Makro TZ Operating Instructions Manual page 19

ProMinent ®
The pump has a fixed setting pressure control valve (see Fig. 12) in the hydraulic end. The
pressure control valve protects the pump (not the system! ) together with the overpressure sensor
(9) and switches off the pump when the feed pressure is too high (=overpressure fuse). If the
discharge side of the liquid end is blocked, the pressure control valve opens at the preset pressure
and allows the hydraulic oil to flow back into the storage tank (8). The overpressure sensor (9)
behind the pressure regulating valve then opens and its contact signal switches off the pump
immediately (to be carried out by the customer! ). Once the system is running within the correct
pressure range the hydraulic end is refilled after a few strokes via the compensation valve (6).
Description of the function of the diaphragm rupture warning system
The diaphragm rupture warning system monitors the composite diaphragm seal. The composite
diaphragm and the diaphragm rupture sensor and evaluation electronics connected downstream
together form the diaphragm rupture warning system.
The composite diaphragm (1) has a contact (2) on one side. If an outer layer of the composite
diaphragm ruptures, metering chemical is forced into it under pressure, inflating the contact. The
contact then pushes against the diaphragm rupture sensor (3), whose contact signal switches off
the pump immediately (to be carried out by the customer! ).
The composite diaphragm also prevents feed chemical from mixing with hydraulic oil in the event
of a diaphragm rupture.
Fig. 13 TZHa diaphragm rupture system function
Function description
Section A - A
(enlarged)
1 Diaphragm
2 Contact
3 Rupture sensor
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