6
PRESSURE BALANCE CONTROL SYSTEM
The Pressure Balance Control (PBC) system provides better control over a chemical pressure
imbalance. When the system is turned off, the Proportioner will perform as if there is no PBC
system and will continue pumping material. When the system is turned on, it will continually
monitor the pressure between the two chemicals (known as the pressure differential). If the
pressure differential becomes equal to or greater than the maximum allowable pressure
differential, the pumps will be shut off.
The Pressure Balance Control system can be simplified into a logic box diagram with inputs and
outputs. There are five inputs: the power supply from the main console, the pressure readings
from each chemical, the maximum pressure, and the maximum allowable pressure differential.
Inside the logic box, the actual pressure differential of the chemicals is compared to the
maximum allowable pressure differential. Depending on the circumstances of all five inputs,
there are only two possible outputs: either the pumps will continue to pressurize and move
material, or the pumps will shut off and flow will be lost.
Logic Box Representation
1. Power supply
2. “A” side pressure reading
3. “R” side pressure reading
4. Maximum pressure
5. Maximum allowable
pressure differential
Logic Box
1. Continue pumping material
OR
2. Shut off pumps
To Next Page
Loading...
