Technical Parameters 以下参数基于费希尔的官方数据表。 Category Parameter Specification / Description General Model 67DFR Type Pilot-Operated, Relief / Backpressure Regulator with Digital Controller Product Line FIELDVUE Input & Control Input Signal 4 to 20 mA DC, two-wire (Standard HART protocol) Supply Pressure (Max) For Regulator Body: 400 psig (27.6 bar) Setpoint Range 3 to 115 psig (0.2 to 7.9 bar) - Adjustable within the unit's limits Performance Relief Pressure Range 0 to 100 psig (0 to 6.9 bar) Flow Capacity (Cv) Vent Capacity: Specific Cv depends on the internal pilot and orifice sizing. Accuracy ±0.5% of span (typical) Stability (Drift) Less than ±0.25% of span per month Environmental Ambient Temperature Standard Electronics: -20°F to 175°F (-29°C to 80°C) Enclosure Rating Type 4X, 6 (IP66/67); Dust-tight and protected against water. Material Body: Aluminum Trim: Stainless Steel Hazardous Area Certifications FM/CSA: Explosion-proof & Intrinsically Safe (Class I, Div. 1, Groups A, B, C, D) ATEX/IECEx: Ex db, Ex ia [ia] (Zone 1) Physical Process Connection 1/4" or 1/2" NPT (Internal) - Specific size is part of the model code Vent Connection 1/4" or 1/2" NPT (Internal) Weight Approximately 4.1 kg (9 lbs)