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Model 2500A High Flow Reversing Relay

Brand: Fairchild Industrial Products
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The Rotork Fairchild Model 2500A Bias Reversing Relay provides an outlet pressure that decreases in direct proportion to increases in input signal.

The input signal that acts on the Diaphragm Assembly opposes the Range Spring force and closes the Supply Valve to decrease output pressure, according to the formula (Po = K - Ps); where Po is output pressure, K is the spring constant, set by the screw, and Ps is signal pressure. 

The M2500A pneumatic relay delivers this performance at a flow capacity of 150 SCFM (255 m3/HR), to provide fast response and tight control over your application.
Features
  • Control sensitivity of 1" water column
  • Flow capacity of 150 SCFM (255 m3/HR)
  • Soft Supply and Exhaust Valve seats
  • Aspirator Tube design
  • Separate Control Chamber
  • Allows use in precision applications
  • Provide fast and responsive system operation
  • Minimizes air consumption
  • Minimizes the effect of supply pressure variation
  • Compensates downstream pressure droop under flow conditions
  • Isolates the diaphragm from the main flow to eliminate hunting and buzzing
The Rotork Fairchild Model 2500A Bias Reversing Relay provides an outlet pressure that decreases in direct proportion to increases in input signal.

The input signal that acts on the Diaphragm Assembly opposes the Range Spring force and closes the Supply Valve to decrease output pressure, according to the formula (Po = K - Ps); where Po is output pressure, K is the spring constant, set by the screw, and Ps is signal pressure. 

The M2500A pneumatic relay delivers this performance at a flow capacity of 150 SCFM (255 m3/HR), to provide fast response and tight control over your application.
Features
  • Control sensitivity of 1" water column
  • Flow capacity of 150 SCFM (255 m3/HR)
  • Soft Supply and Exhaust Valve seats
  • Aspirator Tube design
  • Separate Control Chamber
  • Allows use in precision applications
  • Provide fast and responsive system operation
  • Minimizes air consumption
  • Minimizes the effect of supply pressure variation
  • Compensates downstream pressure droop under flow conditions
  • Isolates the diaphragm from the main flow to eliminate hunting and buzzing
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Specifications

Brand

Ambient Temperature Range

  • -40° to 93.3° C (-40° to 200° F)

Diaphragm Material

  • Nitrile on Dacron

Enclosure, Body Material

  • Aluminum

Exhaust Capacity - Relieving Units Only

  • 40 scfm (65 m³/hour) where Downstream Pressure is psig: 5 (bar: 0.35, kPa: 35) Above psig: 20 (bar: 1.5, kPa: 150) Set Point

Exhaust Port

  • Tapped Exhaust

Flow Capacity

  • 150 scfm (255 m³/hour) at psig: 100 (kPa: 700, bar: 7) Supply & psig: 20 (kPa: 150, bar: 1.5) Set Point

NPT Connection

  • 1/2” NPT Female
  • 3/4” NPT Female
  • 3/8” NPT Female

Pressure Range

  • bar: 0 to 10
  • kPa: 0 to 1,000
  • psig: 0 to 150

Sensitivity

  • 1” WC (2.54 cm)

Signal or Output Pressure - Maximum

  • psig: 150 (kPa: 1,000, bar: 10)

Supply Pressure - Maximum

  • bar: 17
  • kPa: 1,700
  • psig: 250

Supply Pressure Effect

  • Less than psig: 0.1 (bar: 0.07, kPa: 0.7) Per psig: 100 (bar: 7, kPa: 700) Change

Trim Material

  • Brass
  • Zinc-Plated Steel
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