Pulsafeeder Pulsar Shadow - Manual (Page 10)

1.4 Leak Detection Assembly
Figure 4
The Leak Detection Assembly (LDA) consists of a reagent head, suction and discharge check
valves, primary diaphragm, leak detection diaphragm assembly, pressure switch port, and
optional pressure switch and gauge. The reagent head, suction and discharge check valves, and
primary diaphragm are the only parts of the pump to contact the process liquid; consequently,
maintenance is critical to pump performance.
If there is a breach of the primary (product side) diaphragm, process liquid will enter the space
between the primary and leak detection diaphragms. The liquid will be contained in this area and
is prevented from contacting other components of the pump. On the discharge stroke, pressure
will build in between the diaphragms. This pressure will activate the pressure switch. It is
recommended that the pressure switch be integrated into a control system that will shut the pump
off if a leak is detected. The pressure switch may be wired directly to a Pulsafeeder DLC or
DLCM controller if the pump is so equipped.
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