FOXBORO E69F-BI2

Product Name: FOXBORO E69F Series Current-to-Pneumatic (I/P) Converter

Product Introduction: The E69F-BI2 is a field-mounted electro-pneumatic transducer that converts a standard 4–20 mA DC input signal into a proportional 3–15 psig pneumatic output for controlling valves or other pneumatic instruments.

Category: FOBORO

Description

Technical Specifications:

Input Signal: 4–20 mA DC (170 Ω impedance) or split range 4–12 / 12–20 mA
Output Signal: 3–15 psig (20–100 kPa) linear
Supply Pressure: 19–23 psig (130–160 kPa) clean, dry air
Accuracy: ±1.0% of span
Linearity: ±0.5% of span typical
Hysteresis: ±0.5% of span typical
Dead Band: 0.1% of span
Repeatability: ±0.25% of span typical
Air Consumption: 0.3 scfm (0.5 m³/h) at 20 psig supply

Functional Characteristics: Direct or reverse action selectable, external zero adjustment, internal span adjustment, galvanometric motor design with stiff feedback flexures.

Performance Parameters: Supply Pressure Effect: < 0.25% span/psi; Ambient Temp Effect: < ±1.0% span for 28°C change (0–60°C operating); Inclination Effect: < 0.25% span at 5° tilt.

Material Composition: Case: Cast Aluminum (weatherproof); Internal Components: Beryllium copper / phosphor bronze; Fasteners: Stainless Steel; Gaskets: Nitrile or Viton.

Structural Features: Threaded or bolted cover, integral mounting bracket for DN50 (2″) pipe or valve yoke, separate terminal chamber, G1/4 or 1/4 NPT pneumatic ports, IP65 rated.

Working Principle: The input current flows through a coil suspended in a permanent magnetic field (galvanometric motor), producing a torque proportional to current. This deflects a beam, modulating a flapper-nozzle pilot stage which amplifies pneumatic pressure to the output port, with feedback bellows ensuring linearity.

Advantages: No external power supply required (loop powered), minimal effect from dust/corrosion due to generous clearances, robust against shock/vibration, simple calibration.

Applicable Industries: Power Generation (boiler controls), Oil Refining, Chemical Plants, Pulp & Paper, Water Treatment, Metals & Mining.

Model Series: Schneider/Foxboro E69F series.

Installation Requirements: Mount vertically or specified orientation to minimize inclination error; supply air must comply with IEC 654-2 (oil/dust/water free); electrical conduit 1/2″ NPT or M20; ground per local code.

Usage Precautions: Do not exceed 60°C process ambient; ensure supply pressure is ≥3 psi above max output; perform lockout before cover removal in classified areas; zero instrument after final mounting position is fixed.

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