43AP-FA42C/PC Foxboro

43AP-FA42C/PC Foxboro Programmable controller

Product  Description：

The FOXBORO 43AP-FA42C/PC is a model of the Foxboro 43AP Pneumatic Indicating Controller. This instrument is a classic process control device used to measure, indicate, and precisely control a process variable based on pneumatic air signals. The specific code breakdown defines its configuration for field-mounted proportional plus integral control of a received pneumatic signal (pressure).

Product Specifications

The 43AP is a mechanically robust instrument that uses air pressure to perform its control functions.

• Product Type: Pneumatic Indicating Controller

• Manufacturer: Foxboro (now part of Schneider Electric)

• Model Series: 43AP (Pneumatic Indicating Controller)

• Mounting (F): Field Mounted (designed for mounting on a vertical pipe or yoke)

• Control Action (A4): Proportional plus Integral (often called Proportional + Reset). The proportional band is typically adjustable from $4\%$ to $400\%$. The integral (reset) time is adjustable from $0.01$ to $50$ minutes per repeat.

• Output Signal and Gauge (2): Produces a standard pneumatic output signal of $3$ to $15 \text{ psi}$ and includes a $30 \text{ psi}$ output gauge.

• Automatic/Manual Switching (C): Features Bumpless Automatic/Manual Internal Transfer accomplished with a 2-position switch, a balance gauge, and an internal regulator to ensure a smooth transition between control modes without disturbing the process.

• Measuring Element (/PC): Pressure Receiver Bellows. This means the controller's input measurement is a received pneumatic signal, typically a standard $3$ to $15 \text{ psi}$ signal transmitted from a separate process transmitter (e.g., for flow, level, or temperature).

• Supply Pressure: Requires a regulated, clean, and dry air supply of approximately $140 \pm 1.4 \text{ kPa}$ ($20 \pm 0.2 \text{ psi}$).

• Accuracy (Input to Pointer): $\pm 0.5\%$ of span.

• Operating Temperature: Designed for harsh industrial environments, typically $-40^\circ \text{C}$ to $+80^\circ \text{C}$ ($-40^\circ \text{F}$ to $+180^\circ \text{F}$).

Product Advantages

• High Reliability and Durability: Pneumatic controllers are inherently robust and extremely reliable, featuring simple mechanical mechanisms that resist electromagnetic interference (EMI) and operate reliably in high-vibration or high-temperature environments where electronics may fail.

• Intrinsic Safety: Since the device operates purely on air pressure, it is intrinsically safe by design, making it ideal for use in hazardous, explosive atmospheres (classified areas) without the need for special explosion-proof enclosures.

• Stand-alone Control: It performs the full control function (PID, specifically PI in this model) without reliance on a complex Distributed Control System (DCS) or PLC, providing reliable, local control that is immune to electrical power failure (as long as the air supply remains).

• Field Serviceable: The mechanical nature of the 43AP series means they are often field-repairable or easily serviced, extending their operational lifespan significantly.

Important Considerations (Precautions)

• Clean Air Supply: The most critical precaution is ensuring a constant supply of clean, dry, and regulated instrument air. Contaminants (oil, moisture, or particulate matter) can quickly foul the flapper/nozzle assembly and relay, leading to control errors or failure. Regular air filter maintenance is essential.

• Calibration: Due to the mechanical nature of the device, periodic calibration checks are necessary to maintain specified accuracy and ensure the control loop performs correctly.

• Limited Integration: As a pneumatic device, it is more challenging to integrate into modern, digital control networks (like industrial Ethernet) compared to modern electronic controllers, requiring pneumatic-to-electronic converters if digital data is needed.

• Response Time: Pneumatic systems generally have a slower response time compared to electronic controllers due to the time required for air signals to propagate through tubing. This must be considered for high-speed processes.

Product Applications

The FOXBORO 43AP-FA42C/PC is primarily used in continuous process industries for controlling variables where pneumatic components are preferred for safety, reliability, or legacy reasons.

• Chemical and Petrochemical Plants: Control of critical process variables like pressure and temperature, particularly in highly flammable or explosive areas where intrinsic safety is mandatory.

• Oil and Gas Production: Used for local control of wellhead pressures, pipeline pressures, and associated flow control loops.

• Pulp and Paper Mills: Used for controlling process flows, levels, and steam pressures.

• Power Generation: Employed in boiler control systems and balance-of-plant processes.

• Industrial Furnace/Oven Control: Utilizing its high-temperature operating limit to control gas/air ratios or pressures in high-heat applications.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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