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Model 2500A High Flow Reversing Relay

Brand: Fairchild Industrial Products

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

1 - 12 of 25 Part Numbers
2523A
2523A
  • Pressure Range - psig: 0.5 to 10
  • Fitting & Filters - 3/8" NPT
  • Exhaust Port - No Tapped Exhaust
2523AE
2523AE
  • Pressure Range - psig: 0.5 to 10
  • Fitting & Filters - 3/8" NPT
  • Exhaust Port - Tapped Exhaust
2524A
2524A
  • Pressure Range - psig: 0.5 to 10
  • Fitting & Filters - 1/2" NPT
  • Exhaust Port - No Tapped Exhaust
2524AE
2524AE
  • Pressure Range - psig: 0.5 to 10
  • Fitting & Filters - 1/2" NPT
  • Exhaust Port - Tapped Exhaust
2526A
2526A
  • Pressure Range - psig: 0.5 to 10
  • Fitting & Filters - 3/4" NPT
  • Exhaust Port - No Tapped Exhaust
2526AE
2526AE
  • Pressure Range - psig: 0.5 to 10
  • Fitting & Filters - 3/4" NPT
  • Exhaust Port - Tapped Exhaust
2533A
2533A
  • Pressure Range - psig: 0.5 to 30
  • Fitting & Filters - 3/8" NPT
  • Exhaust Port - No Tapped Exhaust
2533AE
2533AE
  • Pressure Range - psig: 0.5 to 30
  • Fitting & Filters - 3/8" NPT
  • Exhaust Port - Tapped Exhaust
2534A
2534A
  • Pressure Range - psig: 0.5 to 30
  • Fitting & Filters - 1/2" NPT
  • Exhaust Port - No Tapped Exhaust
2534AE
2534AE
  • Pressure Range - psig: 0.5 to 30
  • Fitting & Filters - 1/2" NPT
  • Exhaust Port - Tapped Exhaust
2536A
2536A
  • Pressure Range - psig: 0.5 to 30
  • Fitting & Filters - 3/4" NPT
  • Exhaust Port - No Tapped Exhaust
2536AE
2536AE
  • Pressure Range - psig: 0.5 to 30
  • Fitting & Filters - 3/4" NPT
  • Exhaust Port - Tapped Exhaust
1 - 12 of 25 Part Numbers

Specifications

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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