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Application Scenarios:
In a refinery boiler control panel, the 130M-N5 is used to regulate steam drum pressure. The pressure transmitter sends a 3-15 psi signal to the controller. The operator sets the desired pressure on the large front dial, and the controller’s PID action automatically adjusts the output to the steam valve actuator. The A/M (Auto/Manual) transfer switch allows the operator to take manual control of the valve pressure without bumping the process during upsets.
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Manufacturer | Foxboro (now part of Schneider Electric) |
| Model | 130M-N5 |
| Series | Consotrol 130 Series |
| Type | Pneumatic Indicating PID Controller |
| Input Signal (PV) | 3–15 psi (0.2–1.0 bar / 20–100 kPa) |
| Output Signal (OUT) | 3–15 psi (0.2–1.0 bar / 20–100 kPa) |
| Supply Air | 20–22 psi (1.4–1.5 bar) clean, dry instrument air |
| Control Modes | PID (Proportional + Integral + Derivative) |
| Proportional Band (P) | Adjustable, typically 5% to 500% |
| Reset Time (I) | Adjustable, typically 0.01 to 50 min/repeat |
| Rate Time (D) | Adjustable, typically 0.01 to 50 min |
| Accuracy | ±0.5% of span (typical) |
| Display | Vertical scale with two pointers (Green=PV, Red=SP) |
| A/M Switching | Bumpless transfer between Auto and Manual |
| Mounting | Panel mount in 101/102 series rack (1 unit high) |
| Operating Temp. | -20 °C to +60 °C (standard industrial) |
| Air Consumption | ~0.5 m³/h (Auto), ~1.0 m³/h (Manual) |
Technical Principles and Innovative Values:
- Innovation Point 1: Pure Pneumatic Force-Balance Computing. The core of the 130M-N5 is a force-balance system using metal bellows and a nozzle-flapper amplifier. Instead of electronic chips, it uses air pressure and mechanical force to perform the mathematical calculations for PID control. This makes it inherently intrinsically safe (no risk of sparking) and immune to electromagnetic interference, a critical feature for legacy chemical and oil/gas plants.
- Innovation Point 2: Modular “Slide-Out” Serviceability. The controller is designed with separate Auto and Manual control units. If the automatic PID module fails, an operator can physically slide out the auto unit from the rack while the manual unit continues to control the process. This hot-swappable design (for pneumatic systems) minimizes downtime for maintenance in continuous process industries.
- Innovation Point 3: Integral Balancing for Bumpless Transfer. The mechanism uses an “integral balance” method during Auto/Manual transfers. When switching from Manual to Auto, the controller automatically ramps the output to match the current manual output pressure before engaging, ensuring no sudden “bump” in the process variable. This prevents process upsets during operator intervention.
