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Phone: +86 16626708626Description
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Input Signal | 4–20 mA, 4–12 mA, or 12–20 mA dc (170 Ω) |
| Action | Direct or reverse (field selectable) |
| Output Signal | 20–100 kPa / 3–15 psi / 0.2–1.0 bar or kg/cm² |
| Accuracy | ±1.0% of span (output codes 2/3) |
| Linearity | ±0.5% of span typical |
| Repeatability | ±0.25% of span typical |
| Air Consumption | Approx. 0.50 m³/h (0.30 scfm) typical for code 2 |
| Supply Pressure | Nominal 140 kPa / 20 psi (operative limits 130–160 kPa) |
| Enclosure | Bolted cover, weatherproof (IP65 / NEMA 4 equivalent) |
| Mounting | Valve yoke, surface, or 2-inch pipe |
| Approximate Mass | 2.3 kg (5 lb) |
| Electrical Connection | ½-inch conduit / miniature junction box (MS option) |
| Pneumatic Connections | ¼ NPT (supply and output) |
| Ambient Temperature | –40 °C to +80 °C (operative limits) |
4. Product Introduction
The Foxboro E69F-BI2-MS is a field-mounted current-to-pneumatic (I/P) signal converter. It accepts a standard 4–20 mA (or split-range) dc input and converts it to a proportional 3–15 psi pneumatic output for driving control valves or other pneumatic instruments.
The “B” enclosure is the weatherproof bolted-cover version for non-explosionproof applications. The “I2” configuration provides the common 4–20 mA input with 3–15 psi output. The MS suffix denotes the specific junction-box / mounting option supplied with this unit. The converter is compact, simple to install, and remains a widely used workhorse for converting electronic signals to pneumatic actuation in process plants.
- E69F-BI2-MS
- E69F-BI2-MS
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No or low pneumatic output | Insufficient air supply pressure | ✅ High | Measure supply pressure at inlet (target ~20 psi / 140 kPa) | Verify upstream regulator and filters first |
| Output stuck high or low | Clogged filter or nozzle | ✅ High | Isolate and blow out supply and exhaust paths | Clean or replace internal filter elements |
| Output does not track input | Incorrect action (direct vs reverse) or zero/span shift | ✅ High | Apply known 4 mA and 20 mA; check output pressure | Re-calibrate zero and span per procedure |
| High air consumption | Internal leak or damaged diaphragm | ✅ Medium | Compare consumption against datasheet values | Rebuild or replace unit if consumption is excessive |
| Electrical open / no response | Loose conduit connection or open input loop | ❌ Low | Measure loop current at terminals | Confirm 4–20 mA source and wiring integrity |
| Drift with ambient temperature | Normal temperature effect or supply pressure variation | ❌ Low | Monitor supply pressure stability | Maintain regulated, clean, dry instrument air |
If symptoms persist, record supply pressure, input current, and output pressure at several points, then contact technical support with photos of the unit and nameplate.
6. Frequently Asked Questions (FAQ)
Q: What does the model code E69F-BI2-MS mean? A: E69F = Field-mounted I/P converter; B = weatherproof bolted cover; I = 4–20 mA input (170 Ω); 2 = 3–15 psi output; MS = specific junction-box / option package supplied with this unit.
Q: Can it be used in hazardous (explosionproof) areas? A: The “B” enclosure is weatherproof only. For explosionproof service you need the threaded-cover “T” version with the appropriate agency approvals.
Q: Is the action field-reversible? A: Yes. Direct or reverse action can be selected during calibration.
Q: Why is the price lower than a factory-new unit from Schneider Electric? A: This is New Original / New Surplus stock—genuine Foxboro parts that have never been installed in a running system. Units ship with a 1-year warranty after functional verification.
Q: What air quality is required? A: Clean, dry instrument air free of oil and particles. A supply filter-regulator is strongly recommended upstream of the converter.
Q: Can it drive a control-valve actuator directly? A: Yes, for many spring-diaphragm actuators that operate on 3–15 psi. For higher-volume or higher-pressure actuators, a volume booster or positioner is often added.
Q: What is the typical lead time and warranty? A: Units are normally in stock for same- or next-day shipment. All converters carry a 1-year warranty against defects in materials and workmanship.
