Technical Description
The 43AP-FA42C is a classic pneumatic process controller from Yokogawa, designed for precise regulation in electrically hazardous or pneumatic-only environments. Part of the 43AP series, it combines mechanical linkage simplicity with high-precision feedback to control process variables such as pressure, temperature, flow, and level.
This controller provides local setpoint adjustment and proportional-integral (PI) control, converting process measurements into a 20–100 kPa (3–15 psi) pneumatic output signal. Built for rugged industrial conditions, the 43AP-FA42C is widely used in petrochemical, oil, and gas facilities, offering reliable, explosion-proof performance where electronic controllers are impractical.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Designation | 43AP-FA42C |
| Control Action | Proportional + Integral (PI) |
| Measurement Input | Mechanical bellows/diaphragm sensor (pressure/temperature specific) |
| Output Signal | 20–100 kPa (3–15 psi) |
| Supply Air Pressure | 140 kPa (20 psi) nominal |
| Proportional Band | 1%–500% (adjustable) |
| Integral Action (Reset) | 0.01–50 min/repeat |
| Accuracy | ±0.5% of calibrated span |
| Ambient Temperature Range | -30°C to +70°C |
| Enclosure Rating | Weatherproof, corrosion-resistant housing |
| Mounting Options | Pipe, wall, or flush panel |
| Construction Materials | Stainless steel and high-grade aluminum internals |
Operational Application
The 43AP-FA42C is ideal for remote or hazardous locations where electronic DCS or PLC control is impractical. It excels at direct pneumatic control of throttling valves, dampers, and other final control elements, delivering a safe, intrinsically reliable solution.
Common applications include:
-
High-pressure steam lines
-
Process gas flows
-
Combustible fluid storage tanks
Its mechanical, air-powered operation ensures safety and reliability in explosive or electrically restricted environments.
Frequently Asked Questions
Can the 43AP-FA42C be converted from PI to P-only control?
Yes. The integral (reset) action can be deactivated by closing the reset needle valve, converting the controller to proportional-only operation.
What is the recommended maintenance interval?
Annual calibration of linkage mechanisms and inspection of pneumatic bellows is recommended, especially in high-vibration installations.
Is the 43AP-FA42C suitable for cryogenic applications?
Standard models are not rated for cryogenic use. Cryogenic compatibility requires specialized thermal isolation for the bellows and capillary system.
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| Warranty | 12 Months |
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