The Flowserve Logix 520MD is a digital HART positioner that uses piezo technology for accurate control of pneumatic actuators on linear and rotary valves. It accepts a standard 4–20 mA input signal and provides reliable positioning with local calibration via buttons. Many plants choose it for its low steady-state air consumption, straightforward setup, and solid performance in general process applications.
| Parameter | Specification |
|---|---|
| Input Signal | 4–20 mA DC (two-wire) |
| Communication | HART (5, 6, 7) |
| Supply Air Pressure | 1.5–6.0 bar (22–87 psig) |
| Air Consumption (steady state) | 0.08 Nm³/h @ 1.5 bar to 0.12 Nm³/h @ 6.0 bar |
| Output Capacity | Up to 7.0 Nm³/h @ 6.0 bar |
| Linearity | < ±1.0% FS typical |
| Repeatability | < 0.2% FS |
| Deadband | < 0.2% FS |
| Operating Temperature | –40 °C to +80 °C |
| Enclosure Rating | IP66 / NEMA 4X |
| Housing Material | Aluminum (standard) |
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