Operating instructions

Page 20
ProMinent
®
Fig. 11: Section through the diaphragm rupture signalling Sigma
(without electrical component parts)
1 Working layer (
^
=
working diaphragm)
2 Safety layer (
^
=
safety diaphragm)
3 Lug
4 Plunger
5 Diaphragm rupture sensor
6 Cylinder, red
7 Cover, transparent
The multilayer safety diaphragm has the same function as the conventional double diaphragm
systems with working and safety diaphragm; however, it has the advantage that both
diaphragms are grouped to form a unit.
If the working layer (1) ruptures, the metering medium penetrates between the working layer
and the safety layer (2) and spreads. The safety layer ensures that no metering medium leaks to
the outside.
As soon as the metering medium reaches the lug (3) at the edge of the multilayer safety
diaphragm, the lug expands. The lug presses on a plunger (4) in the diaphragm rupture sensor
(5) and the sensor triggers.
In mechanical diaphragm rupture sensors, the sunk red cylinder (6) under the transparent
cover (7) jumps to the front such that it is clearly visible.
In electrical diaphragm rupture sensors, a switch switches. A connected signalling unit signals
the diaphragm rupture. In the control version, the diaphragm rupture sensor is connected to the
“socket for diaphragm rupture monitor”. In case of a diaphragm rupture, the red LED indicator
“Fault” is illuminated at the pump, the identifier “Error" and DIAPH flash on the LCD screen.
Depending on the selected Identcode version in “Displacement body”, the pump continues to
meter (“Pump emits alarm”) or stops (“Pump stops”).
Product description S2Ba/S2Ca
1
2
34567
Design and function description
BA_SI_036_06_10_EN.p65 08.06.2010, 11:38 Uhr20