Pulsafeeder PulsaPro 900 EN - Manual (Page 48)

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9.1 PULSAlarm Leak Detection Diaphragm
Double, or sandwiched, TFE diaphragms are sealed at their peripheries to an intermediate
metal spacer ring. The space between the diaphragms is sealed so that the diaphragm
functions in a manner similar to a standard single diaphragm. In the pressure system, the
space between the diaphragms is filled with a small amount of fluid. At startup, any excess
fluid in the system is expelled through the check valve. Once the excess is removed the
system is capped and sealed. The fluid as supplied from the factory is Silicone LD, but an
alternate fluid can be used if compatibility with the materials of construction is verified. This
space is connected to an adjustable electrical switch (optional) that actuates in response to
buildup of pressure resulting from rupture of either or both diaphragms. Switch operation can
be used to perform any external function, typically to signal an alarm or turn off the pump.
For component location refer to Figure 24.
9.2 Leak Detection – Setup for Pressure
Pumps incorporating pressure leak detection are shipped from the factory with the system fully
set up to work at full pump pressure. No further setup is required. The standard factory barrier
fluid is Silicone LD, if any other customer-specified media is used it must be compatible with
construction materials. The system will require proper setup after maintenance or repairs see
section 9.3 on the following page for the proper procedure.
Figure 25