Description
Core Product Summary
The Foxboro E69F-BI2-S is a compact, field-mounted current-to-pneumatic signal converter. It accepts a standard 4–20 mA (or split-range) DC input and converts it to a proportional 3–15 psi (20–100 kPa) pneumatic output for driving pneumatic instruments or control valves.
The “B” enclosure is a weatherproof bolted cover suitable for non-explosionproof applications. The “I” input code supports 4–20 mA (170 Ω) with selectable direct or reverse action. The “2” output code provides the standard 3–15 psi range. The “S” option adds integrally mounted supply and output pressure gauges.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model | E69F-BI2-S |
| Type | Field-mounted current-to-pneumatic (I/P) converter |
| Enclosure | B – Bolted cover, weatherproof |
| Input | 4–20 mA dc (or 4–12 / 12–20 mA split); 170 Ω; direct or reverse action |
| Output | 20–100 kPa / 3–15 psi / 0.2–1.0 bar or kg/cm² |
| Accuracy | ±1.0 % of span |
| Linearity | ±0.5 % of span (typical) |
| Repeatability | ±0.25 % of span (typical) |
| Hysteresis | ±0.5 % of span (typical) |
| Dead band | 0.1 % of span |
| Supply pressure effect | < 0.04 % of span per kPa (0.25 % per psi) |
| Ambient temperature effect | ±1.0 % of span or less for 28 °C change within 0–60 °C |
| Normal operating temperature | 0 to 60 °C (32 to 140 °F) |
| Ambient temperature limits | –40 to +80 °C (–40 to +180 °F) |
| Relative humidity | 0 to 100 % RH (non-condensing) |
| Air consumption | 0.50 m³/h (0.30 scfm) |
| Enclosure rating | IEC IP65 / NEMA Type 4 |
| Approximate mass | 2.3 kg (5 lb) |
| Mounting | Surface, valve yoke, or DN 50 / 2-inch vertical pipe |
Detailed Product Overview
The E69F series converts a standard milliampere signal into a proportional pneumatic signal for use with pneumatic controllers, recorders, or control-valve actuators. The galvanometric motor design provides generous clearances, reducing sensitivity to dust and corrosion compared with voice-coil instruments.
Stiff feedback flexures and low-mass components minimize the effects of shock, vibration, and inclination. The unit is compact and can be mounted directly on a valve yoke, a flat surface, or a 2-inch pipe. Pneumatic connections are 1/4 NPT; electrical connection is via 1/2-inch conduit entry with flying leads.
The BI2-S configuration is the most common weatherproof version with standard 4–20 mA input, 3–15 psi output, and local supply/output gauges for easy field monitoring and calibration.
E69F-BI2-S
E69F-BI2-S
Engineering Selection Highlights
- Standard 4–20 mA input with 170 Ω impedance matches common DCS/PLC analog outputs.
- 3–15 psi output is the industry-standard signal for most pneumatic control valves and positioners.
- Bolted weatherproof enclosure (IP65/NEMA 4) is suitable for outdoor or wash-down environments when explosion-proof certification is not required.
- Integral supply and output gauges (option S) allow local verification of air supply and output pressure without additional instrumentation.
- Direct or reverse action is field-selectable, providing flexibility for fail-safe valve configurations.
- Low air consumption (0.30 scfm) reduces instrument-air demand.
- Compact size and multiple mounting options simplify installation on valve yokes or pipe stands.
Dimensions, Mounting & Connection Notes
- Approximate mass: 2.3 kg (5 lb)
- Enclosure: Die-cast low-copper aluminum alloy with epoxy powder finish
- Protection: IEC IP65 / NEMA Type 4
- Mounting orientation: Calibrated for vertical mounting unless otherwise specified
- Pneumatic ports: 1/4 NPT
- Electrical: 1/2-inch conduit connection
System Compatibility & Integration Requirements
| Item | Requirement / Compatibility |
|---|---|
| Input signal | 4–20 mA dc (or split ranges); 170 Ω |
| Output signal | 3–15 psi (20–100 kPa) |
| Air supply | Clean, dry instrument air; nominal 20 psi (140 kPa) recommended; must be at least 3 psi above maximum output |
| Pneumatic connections | 1/4 NPT (supply and output) |
| Electrical connection | 1/2-inch conduit entry, flying leads |
| Mounting | Valve yoke, surface, or 2-inch pipe |
| Action | Direct or reverse (specified at order or configured) |
| Gauges | Supply and output gauges included (option S) |
FAQ
What does the Foxboro E69F-BI2-S do?
It converts a 4–20 mA electrical signal into a proportional 3–15 psi pneumatic signal for controlling pneumatic valves or instruments.
What do the model codes mean?
- B = Bolted weatherproof cover
- I = 4–20 mA input (170 Ω)
- 2 = 3–15 psi output
- S = Supply and output pressure gauges
Is this an explosion-proof unit?
No. The “B” enclosure is weatherproof only. Explosion-proof versions use the “T” threaded-cover housing and additional certification codes.
What air supply is required?
Clean, dry instrument air. Nominal supply is 20 psi (140 kPa); it must be at least 3 psi above the maximum output pressure.
Can the action be reversed?
Yes. Direct or reverse action is selectable.
What is the accuracy?
±1.0 % of span for the 3–15 psi output range.
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