Brooks Instrument 5866-AY Pressure Controller

The Brooks Instrument 5866-AY Pressure Controller is a compact, closed‑loop regulator that integrates a pressure transducer, control valve, and electronics to maintain a precise process pressure. Part of the 5866 family, it supports upstream or downstream pressure regulation and uses proportional‑integral control with user‑adjustable proportional band (0.5%–100%) and integral time (0.05–5 s). The unit includes an integral pressure transducer and an analog interface (0–5 V) for process control, with a fast response time under 0.8 seconds to respond to changing conditions. Maximum operating pressure for 5866 configurations reaches up to 1500 psi, depending on the model, and the device can include elastomer‑sealed or metal‑sealed wetted parts. In the 5866RT variant, the system also provides flow measurement across a wide range up to 30,000 sccm, enabling simultaneous pressure and flow regulation. Typical applications span thin‑film processes, chemical and petrochemical research, laboratory experiments, fuel‑cell work, and life‑science research, where stable reactor or chamber pressure must be maintained while adjustable gas flow is provided by an accompanying mass flow controller. The 5866‑AY is designed for compact installation, with mounting dimensions and interfaces that align with Brooks MFC equipment, and it can be configured for either upstream or downstream control to match your process architecture.