Product Introduction: The Honeywell P906 Differential Pressure Controller can be applied in systems to control the pressure difference between supply and return water pipes. The controller outputs an SPDT or 135-ohm proportional signal, enabling the bypass valve actuator to operate according to the set pressure difference. It can also be used for differential pressure protection, monitoring, and interlock control of chillers, ensuring the system maintains a constant differential pressure. Additionally, it is suitable for differential pressure control of steam or liquids.