Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 130M-N5 |
| Manufacturer | Foxboro (now part of Schneider Electric) |
| Product Type | Pneumatic Indicating Controller |
| Control Action | Proportional (P), Proportional-Integral (PI), or Proportional-Integral-Derivative (PID) – field selectable |
| Input Signal | 3 to 15 psig (0.2 to 1.0 bar) standard pneumatic signal |
| Output Signal | 3 to 15 psig (0.2 to 1.0 bar) pneumatic signal |
| Supply Air Pressure | 20 psig (1.4 bar) clean, dry instrument air (typical) |
| Gauges | Dual indicators for Process Variable (PV) and Setpoint (SP) |
| Control Modes | Automatic, Manual (with manual loading station) |
| Case Style | Round, field-mount housing |
| Connections | 1/4″ NPT pneumatic ports for input, output, and supply |
| Mounting | Direct pipe or surface mounting |
| Setpoint Adjustment | Local, manual dial on front of controller |
| Ambient Temperature Range | Standard industrial range (e.g., -20°F to +180°F / -29°C to +82°C) |
Main Features and Advantages
The Foxboro 130M-N5 is renowned for its simplicity, robustness, and intrinsic safety. Its purely mechanical-pneumatic operation makes it inherently suitable for use in hazardous areas classified for explosive atmospheres, as it generates no sparks or heat that could ignite flammable gases. The core of its operation is the precise force-balance mechanism, which provides highly responsive and stable control with minimal maintenance requirements. The large, clear concentric scales allow for easy reading of both the process variable and the manually adjusted setpoint, providing excellent local visibility and operator interface without the need for external power.Reliability is a paramount advantage. With no electronic components, integrated circuits, or software, the Foxboro 130M-N5 is immune to electromagnetic interference (EMI), radio frequency interference (RFI), and power supply fluctuations that can disrupt electronic controllers. Its design ensures a long operational life, often spanning decades, with only basic cleaning and occasional calibration required. The controller offers flexible tuning with accessible adjustments for proportional band (gain), integral (reset), and derivative (rate) times, allowing it to be optimized for a wide variety of process dynamics. The ability to switch between automatic and manual control modes locally provides operators with direct, hands-on intervention capability. This combination of safety, durability, and straightforward operation solidified the 130M-N5 as a trusted workhorse in countless process plants.
Application Field
The Foxboro 130M-N5 pneumatic controller was and continues to be deployed in a vast array of process industries where reliable, simple, and intrinsically safe control is paramount. In oil and gas production and refining, it is commonly found controlling pressures in distillation columns, flow rates in pipelines, and levels in separators and storage tanks. Its pneumatic nature made it ideal for remote, unpowered locations and hazardous areas on offshore platforms and in refineries. Within chemical and petrochemical plants, the Foxboro 130M-N5 was used to regulate reactor temperatures, batch process sequences, and the blending of various chemicals.In power generation facilities, particularly in older plants, these controllers managed feedwater levels, steam pressures, and fuel flow. The water and wastewater treatment industry also relied heavily on pneumatic controls like the 130M-N5 for controlling pump discharge pressure, flow pacing for chemical addition, and tank level control. Even in industries like pulp and paper, and food and beverage, these controllers were staples for analog loop regulation. Today, its primary application field is in the maintenance and support of these legacy systems. The Foxboro 130M-N5 remains essential for spare part strategies, allowing plants to extend the life of reliable pneumatic control loops without the cost and complexity of a full system modernization to electronics.
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