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Phone: +86 16626708626Description
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Input Signal | 4–20 mA dc (also supports 4–12 or 12–20 mA) |
| Input Impedance | 170 Ω |
| Output Signal | 20–100 kPa / 3–15 psi / 0.2–1.0 bar or kg/cm² |
| Action | Direct or reverse (specify at order) |
| Enclosure | Threaded cover, explosion-proof |
| Junction Box | Integral explosion-proof |
| Air Supply Options | Adjustable filter regulator (no gauge) + supply/output gauges |
| Accuracy | ±1.0% of span (typical for this output range) |
| Linearity | ±0.5% of span typical |
| Repeatability | ±0.25% of span typical |
| Hysteresis | ±0.5% of span typical |
| Dead Band | 0.1% of span |
| Ambient Temperature Effect | ≤ ±1.0% of span for 28 °C (50 °F) change |
| Supply Pressure Effect | < 0.04% of span per kPa (0.25% per psi) |
| Mounting | Field-mounted |
| Weight (approx.) | 2.3 kg (5.1 lb) |
4. Product Introduction
The Foxboro E69F-T-I2-JRS is a field-mounted current-to-pneumatic signal converter that accepts a standard 4–20 mA dc input and produces a proportional 3–15 psi (20–100 kPa) pneumatic output. It is used to drive pneumatic control valves, positioners, and other pneumatic instruments in process plants.
This specific configuration includes a threaded explosion-proof cover, integral explosion-proof junction box, adjustable filter regulator, and supply/output gauges. The design minimizes the effects of shock, vibration, and ambient conditions, making it suitable for outdoor or hazardous-area installations where a reliable I/P interface is required.
E69F-T-I2-JRS
E69F-T-I2-JRS
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No pneumatic output | No air supply or clogged filter/regulator | ✅ High | Verify supply pressure at regulator inlet; check filter | Restore clean, dry air supply; clean or replace filter |
| Output stuck at zero or full | Input signal missing or open loop | ✅ High | Measure 4–20 mA at input terminals | Confirm controller/DCS output and wiring integrity |
| Output not tracking input | Calibration drift or restricted air passages | ✅ Medium | Apply known mA values and compare output pressure | Perform zero/span calibration per manual |
| Erratic or oscillating output | Contaminated air or vibration | ✅ Medium | Inspect air quality; check mounting | Install better filtration; isolate from vibration |
| Air leaking from unit | Damaged diaphragm or fittings | ✅ High | Soap-bubble test around housing and connections | Repair or replace unit if internal leak confirmed |
| Unit does not respond in hazardous area | Wrong enclosure or damaged seals | ❌ Low | Confirm T-enclosure and certification labels | Do not use non-explosion-proof substitutes |
If the converter fails to produce the expected output under known good input current and clean air supply, photograph the nameplate, gauges, and wiring, then contact technical support with the readings.
6. Frequently Asked Questions (FAQ)
Q: Is the E69F-T-I2-JRS still in production?
A: This model has been discontinued by Foxboro/Schneider Electric with no direct factory replacement listed in many channels. Units available on the secondary market are typically new surplus or carefully tested used stock. Confirm current availability and lead time before committing to a multi-unit purchase.
Q: What air supply pressure does it need?
A: Standard industrial instrument air is required. The included adjustable filter regulator lets you set the correct supply pressure for the 3–15 psi output range. Always use clean, dry, oil-free air.
Q: Can I change between direct and reverse action in the field?
A: Action (direct or reverse) is specified when the unit is ordered/configured. Field conversion is possible on some E69F variants but requires following the service manual procedures and may affect certification. Verify the existing unit’s configuration before swapping.
Q: Does this unit include gauges?
A: Yes. The “S” option provides supply and output gauges. The “R” option is the adjustable filter regulator without its own gauge.
Q: Is the explosion-proof rating still valid on surplus units?
A: The mechanical enclosure and integral junction box retain their design ratings, but any surplus or used unit should be inspected for damage to covers, threads, and seals. Confirm the specific certification marks (ATEX, FM, CSA, etc.) match your site requirements.
Q: Why is a used or surplus unit cheaper than a new quote?
A: Factory production has ended. Available units are new surplus (never installed) or refurbished. They do not carry a current OEM warranty. We supply functional test results and our own limited warranty.
Q: What should I check before installing a replacement?
A: Confirm input signal type (4–20 mA), desired action (direct/reverse), output range (3–15 psi), air supply quality, and that the explosion-proof enclosure matches the area classification. Take photos of the existing unit’s nameplate and tubing connections before removal.
