Foxboro 130M-N4 Pneumatic Indicating Controller
Configured for proportional-integral-derivative control execution in process loops, the Foxboro 130M-N4 (130M Pneumatic Indicating Controller) provides direct physical/electrical execution through force-balance pneumatic mechanism operations.
Suffix Breakdown & Model Matrix
| Code Suffix | Feature Description | Electrical / Physical Specification |
|---|---|---|
| 130M | Base Model Designation | Pneumatic Indicating Controller with manual set-point adjustment |
| N | Mounting & Enclosure | Shelf-mounted design for multi-unit panel integration |
| 4 | Control Mechanism Option | Full PID control configuration (Proportional + Reset + Derivative) |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 130M-N4 |
| Brand | Foxboro |
| Origin | USA |
| Weight | 3.50 kg (7.72 lbs) |
| Dimensions | Standard 130 Series shelf-mounting dimensions |
| Operating Temp | -20 to +65 deg C |
| Power Consumption | 0.5 to 1.0 m3/h clean compressed air |
| Supply Pressure | 20 to 22 psi (140 to 150 kPa) |
| Input Signal | 3 to 15 psi (20 to 100 kPa) pneumatic |
| Output Signal | 3 to 15 psi (20 to 100 kPa) pneumatic |
| Indicator Accuracy | +/- 0.5% of span |
| Output Accuracy | +/- 2% of span |
| Repeatability | +/- 0.5% of span |
| Process Connection | 1/4 inch NPT pneumatic fittings |
Channel-to-Channel Isolation & Pneumatic Loop Signal Processing
The controller relies on force-balance mechanics integrated into a internal pneumatic circuit board to process 3-15 psi field signals without electronic conversion latencies. This analog pneumatic architecture eliminates loop-grounding hazards by providing complete physical isolation from electrical plant noise and common-mode voltage interference. The internal air distribution manifold uses O-ring sealed connections to maintain pressure integrity during automatic-to-manual bumpless transfers across process control loops.
Frequently Asked Questions
Q: What air supply pressure range is required for standard unit operation?
A: The instrument requires a regulated air supply between 20 psi and 22 psi (140 to 150 kPa) to drive the internal force-balance mechanism and output circuits.
Q: How is a bumpless transfer achieved when switching between manual and automatic control?
A: The balanceless and bumpless transfer mechanism matches internal pneumatic force states automatically, allowing front-panel mode selection without adjusting manual set-point pressures or causing process output spikes.
Q: What air quality standard applies to the pneumatic supply input?
A: The instrument air supply must be dry, oil-free, and filtered to remove particulate matter greater than 5 microns to prevent clogging of the internal restriction orifices and nozzle-flapper assemblies.
Field Installation Guidelines
Mount the controller into the designated instrument shelf assembly, ensuring the integral air supply header seals against the rear pneumatic manifold connectors. Thread all pneumatic signal lines using 1/4 inch NPT male fittings, applying a minimum of 5 full turns of engagement to establish a leak-tight seal. Use clean, instrument-grade dry compressed air regulated strictly to 20-22 psi. When routing copper or stainless steel pneumatic tubing, maintain a minimum bend radius of 25 mm to prevent restriction or wall collapsing that could alter process response times.
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Guide
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