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Pump line (o) - Located on the P-Box. The line connects the P-Box to the Diaphragm Pump. A
hydrophobic 0.2micron filter in this line provides both a sterile barrier and a potential barrier
to the back flow of liquid from Diaphragm Pump to controller should a diaphragm rupture.
Note: Be sure to use the hydrophobic filter in the pump line to prevent accidental flow of liquid from the
Filtration Assembly to the P-Box.
Air Pressure regulator - Typical range of regulator is 0-60psi/ 4.1bar. This is a second stage
pressure regulator for regulating service air inlet pressure to a specified, user required, value.
Note: Typically, the secondary air pressure is regulated to 35psi/2.4bar. That value is selected
because that pressure is recommended to drive the proportional pressure control valve PRV1 and
it is generally the upper limit of the pressure required to achieve set flow rates.
Air Pressure Gauge (j) - Located on the upper side of the P-Box. Typical range of gauge is 0-
60psi. It shows second stage system pressure.
Vacuum Gauge (k) - Located on the upper side of the P-Box. Typical range of gauge is 0 to -
14psi / -0.95 bar. It shows primary vacuum pressure status.
5.7 Primary Electric Services
Electric plug (t) - Located on the power separation portion of E-Box. Electric power (standard
100-240V AC, 60/50Hz).
Power switch (u) - Located on power separation portion of E-Box.
Power indicator Light (u) - same as the power switch. Lights green when power is ON
System Stop Button (d, l) - Located on the P-Box and E-Box.
Either System Stop Button causes the system to cease operation and default to Standby
mode. Here the Diaphragm Pump defaults to Exhaust.
System Stop Button is not an emergency stop.
5.8 Signal
A total of 4 Sensor input plugs (m) are provided on the P-Box. All inputs are analogue 4-
20mA. Three plugs P3, P4 and P5 are for pressure inputs. One plug W1 is for a load Cell input.
Ethernet/Profibus (g) - communication port for data acquisition on E-Box.
Relays – Two relay outputs are for relaying alarm conditions (i). Two relays for driving a
harvest pump (h).
Interconnect (Signal) Cables (I-Cable) - to relay signal and DC power between E-Box and P-
Box.
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