Technical Specifications Category Specification Model Type 3660 Type Pneumatic Force-Balance Level Transmitter (Displacer-Type) Measurement Principle Buoyancy (Archimedes' Principle) Output Signal 3 to 15 psig (0.2 to 1.0 bar) Supply Air Pressure 20 psig (1.4 bar) minimum, 35 psig (2.4 bar) maximum. A clean, dry air supply is required. Air Consumption Approximately 0.5 SCFM (14 standard liters per minute) at maximum output. Span Adjustment Field-adjustable, typically covering a wide range of buoyancy forces (e.g., corresponding to 5 to 50 inches of water column). Accuracy Typically ±0.5% of span. Repeatability Typically ±0.1% of span. Displacer Sizes Available in various lengths and diameters to match the specific gravity of the process liquid and the required measurement span. Process Connections Standard: 2-inch NPT. Flanged options are also available (e.g., 150# RF, 300# RF). Materials of Construction Body/Bonnet: Epoxy-coated Cast Iron or Ductile Iron. Internals & Displacer: 316 Stainless Steel standard; other materials like Monel, Hastelloy available for corrosive services. Ambient Temperature Limit -20° to +150°F (-29° to +66°C) Process Temperature Limit Up to +750°F (+399°C) with an extended bonnet and high-temperature seals. Approvals Intrinsically Safe for Class I, Division 1, Groups B, C, D hazardous locations (FM, CSA).
