FISHER™ 3661
Technical Parameters
Parameter Specification
Model Fisher 3661 (Various suffixes denote specific types, e.g., 3661L for large displacer)
Type Pneumatic Displacer Level Controller
Measurement Principle Buoyancy (Torque Tube)
Output Signal 3 to 15 psig (0.2 to 1.0 bar) pneumatic, proportional to level
Supply Air Pressure 20 psig (1.4 bar) minimum, typically 20-35 psig (1.4-2.4 bar) is supplied.
Air Consumption Very low at steady state; typically < 0.1 SCFM (0.17 m³/hr).
Mounting Top-mounted (suspended from the top of the vessel).
Displacer Length Available in various standard lengths to match the required level measurement span.
Process Connections Typically 2-inch NPT or 150# / 300# Flange.
Body Materials Cast Steel, Stainless Steel, Alloy Steel
Displacer & Torque Tube Stainless Steel (standard), other alloys available for corrosive services.
Temperature Limits Standard: -20°F to 450°F (-29°C to 232°C).
High-Temp versions available up to 850°F (454°C).
Pressure Rating Up to 3000 psig (207 bar) depending on model and torque tube rating.
DIL-SWD-32-002
Technical Parameters
Parameter Category Specification Details
General Model DIL-SWD-32-002 DIL Series, Side-Mount, Screw Terminal, 2NO Contact Block
Compatible Main Devices Eaton DIL Contactors and Relays Must be used with specific DIL series models.
Contact Characteristics
Number of Contacts 2 NO (Normally Open)
Contact Type Screw terminal.
Rated Operational Current (Ith) Typically 6 A (e.g., at 250V AC).
Rated Thermal Current (Ithe) 10 A.
Rated Operational Voltage (Ue) Up to 250V AC / 30V DC.
Mechanical Characteristics
Mounting Side-mounted onto compatible DIL contactors/relays.
Electrical Durability Typically > 10 million operations.
Mechanical Durability Typically > 20 million operations.
Standards & Compliance
Safety Standards UL 508, CSA C22.2 No. 14, CE, IEC/EN 60947-5-1.
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