Foxboro 43AP-FA42D/PB-AA Pneumatic Indicating Controller

Description

Foxboro 43AP-FA42D/PB-AA Pneumatic Indicating Controller

Product Dimensions：

The Foxboro 43AP-FA42D/PB-AA is a highly reliable pneumatic indicating controller, part of the legendary 43AP Series. This specific configuration is designed for field-mounted applications and features a robust manual/auto transfer system.

Product Detailed Description

The 43AP is a versatile process controller that continuously compares a process measurement (pressure, temperature, flow, or level) to a set point and generates a pneumatic output signal.

Model Code Breakdown:

• F: Field mounting (NEMA 3 enclosure).
• A4: Proportional plus Reset (Integral) control action (0.01 to 50 minutes per repeat).
• 2: Output signal of 3 to 15 psi (30 psi gauge).
• D: Two-position nozzle seal switch for manual control.
• PB-AA: Specific internal configuration/options (typically referring to the element type and internal tubing).

Technical Parameters

Product Advantages

• Legendary Reliability: Known in the industry as a “workhorse,” the 43AP can operate for decades in harsh outdoor environments without electronic failure.
• Explosion Proof by Nature: As a purely pneumatic device, it is inherently safe for use in hazardous areas where electrical sparks would be dangerous.
• High Visibility: The large, easy-to-read dial provides a clear indication of the process measurement and set point even from a distance.
• Easy Maintenance: The modular design allows for the control unit, relay, and bellows to be serviced or replaced independently.

Important Considerations (Precautions)

• Air Quality: The instrument requires clean, dry, and oil-free air. Moisture or oil in the supply line is the #1 cause of flapper-nozzle clogging and relay failure.
• Leak Detection: Ensure all 1/4 NPT connections are tight. Small leaks in the reset bellows or feedback tubing will cause significant control drift.
• Calibration: If the controller is hunting or “offsetting,” verify the reset (integral) time setting and the alignment of the proportioning lever.
• Environment: While the NEMA 3 case is rugged, ensures the door gasket is intact to prevent corrosive gases from entering the internal mechanism.

Product Applications

The Foxboro 43AP is widely used in legacy and remote industrial sites:

• Oil & Gas: Controlling pressure in remote wellheads and pipelines where electrical power is unavailable.
• Chemical Processing: Regulating temperature in reactors or storage tanks using pneumatic control valves.
• Water Treatment: Level control in tanks and flow regulation in large-scale filtration systems.
• Pulp & Paper: Managing steam pressure and consistency in paper machine drying sections.

Payment: Bank of Chicago, Bank of Singapore

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