PH/PHX-2 Manual
26
PRESSURE BALANCE CONTROL
The PH Series Proportioner has been designed with a pressure balance control system. This
system will give the operator of this machine the ability to control a pressure imbalance within
certain predetermined parameters.
The system consists of:
Selector Switch
Fault Light
On Light
Control Unit
Pressure Transducers
Relay
Operation
Position the selector switch on one of the three options:
Pressure differential number – these consist of 300, 400, 500, 600, and 700 PSI.
Selecting any of these numbers with the switch will activate the green ON light. While
the pressure differential numbers are selected, the control box will continually monitor
pressure on both sides of the Proportioner. In the event that the pressure differential
between both sides of the Proportioner is equal to or larger than the selected number,
a fault is given (the red fault light is turned on and the active green light is turned off)
and shuts down.
Off – if the selector switch is placed in this position, the Proportioner will operate as
though there is NO PRESSURE BALANCE CONTROL SYSTEM (neither the red fault
light nor the active green light will be lit). The over pressure system will remain active
for the machine and personnel protection.
Reset – in the event of a pressure imbalance, resolve the Proportioner imbalance,
position the selector switch on reset to clear the fault light and restore power to the
Proportioner. After the fault has been cleared, position the switch in either a Pressure
Differential number or in the Off Position to continue operations.
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