43AP-FA42C/PC FOXBORO

43AP-FA42C/PC Foxboro Processor module

Brand：Foxboro Model number：43AP-FA42C/PC

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

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Product Details：

Product Dimensions：

The full part number 43AP-FA42C/PC breaks down as follows:

43AP: Model 43AP Pneumatic Indicating Controller.
-F: Field mounting (typically pipe or yoke mounted).
A4: Proportional plus Integral (Reset) control action, with an adjustable reset time from $0.01$ to $50$ minutes per repeat.
2: Output Signal and Gauge specification: $3$ to $15 \text{ psi}$ output signal, and a $30 \text{ psi}$ output gauge.
C: Bumpless Automatic/Manual Internal Transfer Switching, which includes a 2-position switch, a balance gauge, and a regulator.
/PC: Pressure Receiver, Bellows measuring element. This element receives a $3$ to $15 \text{ psi}$ signal (a pneumatic signal representing the measured process variable) and moves the controller's indicating pointer.

Key Technical Parameters

Product Type: Pneumatic Indicating Controller
Control Type: Proportional plus Integral (P+I)
Output Signal: $3$ to $15 \text{ psi}$ (a standard pneumatic control signal)
Supply Pressure: Typically $140 \pm 1.4 \text{ kPa}$ ( $20 \pm 0.2 \text{ psi}$ ), requiring a clean and dry air source.
Accuracy (Input to Pointer): $\pm 0.5\%$ of span
Repeatability: $0.2\%$ of span
Deadband: $0.1\%$ of span
Operating Temperature: $-40^{\circ}\text{C}$ to $+80^{\circ}\text{C}$ ( $-40^{\circ}\text{F}$ to $+180^{\circ}\text{F}$ )
Approximate Mass: $4.8 \text{ kg}$ (excluding measuring element)

Product Advantages

High Reliability: As a pneumatic device, the 43AP is inherently rugged and highly resistant to electrical noise and interference, making it extremely reliable in harsh industrial environments.
Versatile Control: It provides Proportional plus Integral control, a very common and effective control algorithm for maintaining a process variable precisely at the set point without offset.
Bumpless Transfer: The 'C' switching option enables smooth, bumpless transfer between automatic and manual control modes, which is critical for preventing process disturbances during operational changes.
Wide Application Range: Its capability to control process variables like pressure, temperature, flow, and level makes it highly versatile.
Intrinsic Safety: Since it operates purely on compressed air, it is intrinsically safe for use in hazardous, explosive atmospheres where electronic devices would require expensive and complex protection.

Important Considerations (Precautions)

Air Supply Quality: The controller requires a clean, dry, and regulated air supply (typically $20 \text{ psi}$ ). Moisture or contaminants in the air can cause corrosion or clogging, leading to poor performance or failure.
Calibration: Like all precision instruments, the 43AP requires periodic calibration and maintenance to maintain its stated accuracy and optimal control performance.
Pneumatic Lag: Pneumatic control signals inherently travel slower than electronic signals. For very fast or distant control loops, a modern electronic controller might be more suitable.
Field Installation: The 'F' mounting code indicates it is designed for field installation, requiring protection from direct weather and a stable mounting structure.
Legacy Status: This model is a legacy instrument and may be discontinued by the manufacturer (Foxboro is now part of Schneider Electric). While robust, long-term support and parts availability may be a consideration.

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