The Foxboro SRD991 is an intelligent electro-pneumatic valve positioner designed for precise control of pneumatic linear and rotary valve actuators. It supports 4–20 mA input with HART communication (and other protocols in different versions) and features auto-start with self-calibration, self-diagnostics, and easy local configuration via push buttons and a graphical LCD. Known for its low air consumption and robust performance, it is a reliable choice for process industries requiring accurate valve positioning with diagnostic capabilities.
| Parameter | Specification |
|---|---|
| Input Signal | 4–20 mA DC + HART |
| Communication | HART (standard), PROFIBUS-PA, FOUNDATION Fieldbus H1 available |
| Supply Air Pressure | 1.4 – 6 bar (20 – 90 psig), up to 7 bar with spool valve |
| Stroke Range | 8 – 260 mm (0.3 – 10.2 in) with standard lever |
| Rotary Angle | Up to 95° (up to 300° optional) |
| Linearity | < 0.4% of travel span |
| Hysteresis | < 0.3% of travel span |
| Repeatability / Sensitivity | < 0.1% of travel span |
| Operating Temperature | –40 °C to +80 °C (model dependent) |
| Enclosure Rating | IP65 / NEMA 4X |
| Action | Single or double-acting |
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