43AP-PA42C FOXBORO Pneumatic Indicating Controller

Product Description

43AP-PA42C is a discontinued pneumatic indicating controller manufactured by Foxboro. It is a field-mounted process control instrument with bellows absolute pressure measuring element. The unit adopts fiberglass reinforced housing with IP53 / NEMA Type 3 weatherproof protection, equipped with built-in bumpless auto-manual transfer function, delivering 3-15psi standard pneumatic output signal for industrial closed-loop control.

Product Features & Functions

• Real-time measurement and indication of absolute pressure via bellows sensing element
• Supports proportional plus integral control algorithm for stable process regulation
• Built-in bumpless automatic / manual balance transfer without process disturbance
• Standard 3 to 15 psi pneumatic output to drive pneumatic control valves
• Weatherproof enclosure, suitable for pipe mounting or surface mounting in industrial sites
• Local process value display for on-site operator observation and parameter adjustment

Application Scenarios

• Oil & gas, chemical, petrochemical process pressure control loops
• Absolute pressure monitoring and regulation for vacuum systems
• Legacy pneumatic control system maintenance and spare part replacement
• Power plant, pulp and paper industrial process control
• Hazardous areas where pneumatic instruments are preferred over electronic devices

FAQ

Q: Is 43AP-PA42C still in active production?
A: This model has been discontinued by Foxboro. Only surplus new old stock, used and refurbished units are available in the market.

Q: What process variable does PA element version measure?
A: PA suffix stands for bellows absolute pressure element, it measures absolute pressure instead of gauge pressure.

Q: Can this controller be replaced by electronic transmitters directly?
A: Direct replacement requires modification of control loop. Pneumatic to electric signal conversion is needed if switching to electronic control system.