Technical Parameters Parameter Specification Model Fisher™ 4660 Type Digital Valve Positioner with Foundation Fieldbus Communication Protocol Foundation Fieldbus H1 (31.25 kbit/s) Input Signal Digital setpoint via Fieldbus Supply Air Pressure 20 to 100 psig (1.4 to 6.9 bar) Air Consumption Less than 0.2 SCFM (0.33 m³/hr) at steady state. Stem Travel Range 0.2 to 4.0 inches (5.0 to 101.6 mm) for linear actuators; 25° to 120° for rotary actuators. Accuracy Better than ±0.5% of span (including linearity, hysteresis, and dead band). Ambient Temperature Range -40°F to 185°F (-40°C to 85°C) Enclosure Rating NEMA 4X (IP66/67) Hazardous Area Approvals FM, CSA, ATEX, IECEx for Class I, Division 1 / Zone 1 hazardous locations. Function Blocks Contains standard Fieldbus function blocks (AI, AO, PID, etc.) for distributed control. Partial Stroke Test (PST) Configurable for automated testing of Safety Instrumented Functions (SIF).
