The Fisher 2500-249 Series refers to a family of pneumatic controllers and transmitters designed for liquid level, interface level, and density control in industrial process applications. Here's a detailed overview:

• Series Includes: 2500, 2500C, 2500R, 2500S, 2500T, 2502, 2502C, 2502F, and 2503
• Function: Displacer-style pneumatic instrumentation for process control
• Applications: Liquid level, interface level, and density service in vessels and tanks

Key Features

• Sensor Types:
  • Caged sensors: Provide stable operation in turbulent or obstructed vessels
  • Cageless sensors: Used for specific gravity and interface control with large displacers
• Displacer Stem Options: Multiple lengths available to optimize depth placement
• Mounting: Flange connections up to NPS 8 for large displacers
• Output Signal: Pneumatic, typically 3–15 psi