Key Technical Specifications
- Product Model: F5-MEC-420
- Manufacturer: Flowserve Limitorque
- System Platform: Limitorque MX / QX with F5 IS mainboard
- Output Signal: 4–20 mA two-wire loop-powered (position feedback) + HART 7 digital overlay
- Accuracy: ±0.5 % of full span (typical), ±1.0 % worst case
- Linearity: ±0.5 % F.S.
- Hysteresis + Deadband: ≤ 0.5 % F.S.
- Temperature Effect: ≤ 0.01 %/°C
- Hazardous Area Certification: ATEX / IECEx II 1 G Ex ia IIC T4 Ga, CSA/FM Class I Div 1 Groups A–D T4 intrinsically safe
- Functional Safety: SIL 2 capable (certified as single device), suitable for SIL 2 loops
- Supply Voltage: 11–30 VDC (loop powered)
- Maximum Load: 750 Ω at 24 VDC
- HART Communication: HART 7, point-to-point or multidrop, compatible with AMS, ValVue, DTM, and 475/375 field communicators
- Operating Temperature: –40 °C to +85 °C (full specification)
- Enclosure Protection: IP66 / NEMA 4X (when installed in MX/QX housing)
- Weight: Approx. 120 g (card only)
- MTBF: > 380,000 hours (MIL-HDBK-217F)
Technical Architecture & Functional Positioning
The F5-MEC-420 is the intrinsically safe member of Flowserve’s F5 modular control package for Limitorque MX and QX non-intrusive electric actuators. It occupies the dedicated analog-output slot on the F5 IS mainboard and converts the absolute position measured by the actuator’s hall-effect encoder into a high-precision 4–20 mA signal.
Unlike simple potentiometer-based feedback, the F5-MEC-420 uses the same digital position count that drives the actuator’s LCD and control logic, eliminating mechanical wear and drift. Calibration is performed non-intrusively via HART or the actuator’s local interface — no potentiometer adjustments or loop calibrators are required.
In safety-instrumented functions (SIF), the module is frequently used for continuous monitoring of final elements (MOVs or ESD valves) where partial-stroke testing (PST) and position trending are mandated by IEC 61511.
Typical Application Scenarios
- Continuous position feedback on critical motor-operated valves (MOVs) in nuclear outside-containment and conventional power plants
- Emergency shutdown (ESD) valve monitoring in upstream oil & gas separation and pipeline stations
- Partial-stroke testing and position verification on HIPPS final elements
- Refinery and petrochemical safety-critical block valves integrated with Triconex, HIMA, or Emerson DeltaV SIS
- LNG liquefaction train compressor anti-surge and blowdown valves requiring SIL 2 position indication
- Retrofit of older Limitorque actuators (SMB, L120, MX) to provide modern 4–20 mA + HART feedback without replacing the entire actuator
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