Foxboro 43AP-FA42C/PB-44 Pneumatic Indicating Controller – Product Description

Description / Overview

The Foxboro 43AP-FA42C/PB-44 is a robust pneumatic indicating controller engineered for demanding industrial measurement and control tasks. It integrates a precision mechanical indicator with a stable force-balance control mechanism, giving operators reliable performance in pressure, temperature, vacuum, and differential-pressure applications. Moreover, the controller maintains accurate output behavior under harsh operating conditions, helping facilities achieve consistent process stability. Its mechanical design avoids electronic drift, therefore ensuring dependable long-term operation in remote or high-temperature environments.

Technical Data / Specifications

• Model: 43AP-FA42C/PB-44

• Series: Foxboro 43AP Pneumatic Indicating Controllers

• Type: Pneumatic indicating controller

• Measured Variables: Pressure, temperature, vacuum, differential pressure

• Control Modes: On-off; proportional 4–400%; proportional + derivative 0.05–50 min; proportional + reset 0.01–50 min/repeat; PID; differential gap 1–100%

• Output Signal: 3–15 psi (20–100 kPa); gauge pressure up to 30 psi (200 kPa)

• Accuracy: ±0.25% of span (typical)

• Span Adjustability: Up to 10:1 range

• Calibration: On-line with vernier adjustment

• Options: Remote pneumatic set point, auto/manual transfer, batch function, Type 70 electric contacts, valve mounting

• Operating Temperature: –40 °C to +85 °C

• Humidity Range: 5–95% non-condensing

• Protection Class: NEMA 3 enclosure

• Country of Origin: USA

• Additional Variant: 43APFA42CPBAA – Proportional + reset, 3–15 psi output, SS pressure element 0–250 psig, discontinued model

• Weight: 17 lbs

FAQ

Q1: Does the 43AP-FA42C/PB-44 work with modern valve positioners?
Yes. The standard 3–15 psi signal connects directly to pneumatic positioners and legacy control valves.

Q2: Can this controller perform full PID control?
Yes. It offers proportional, reset, and derivative functions, allowing operators to tune complete PID loops.

Q3: Is the unit suitable for outdoor field installation?
Yes. The NEMA 3 housing protects the controller from weather exposure in typical industrial environments.

Q4: Does Foxboro still manufacture this configuration?
Certain variants, such as FA42C/PB-AA, are discontinued; however, many units remain supported through industrial suppliers.

Q5: Can the controller be recalibrated on-line?
Yes. Technicians can adjust span and zero using the front vernier mechanism without interrupting the process.