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Model 1500A High Flow Positive Bias Relay

Brand: Fairchild Industrial Products
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The Rotork Fairchild Model 1500 Positive Bias Relay is designed for applications that require an output pressure that is the sum of a controlled input signal plus a fixed bias.

This pneumatic relay provides high output flow at an output pressure that represents the input signal pressure plus a preset bias.

The output of the relay is the sum of the spring bias, set with the Range Screw, plus a pneumatic input signal. (Po = Ps + K); where Po is output pressure, Ps is signal pressure, and K is the spring constant set by the Range Screw.
Features
  • Control sensitivity of 1" water column.
  • Large Supply and Exhaust Valves.
  • Soft Supply and Exhaust Valve seats.
  • A balanced Supply Valve.
  • Aspirator Tube design.
  • A separate Control Chamber.
  • Unit construction.
  • Allows use in precision applications.
  • Provides high forward and exhaust flows.
  • Minimizes air consumption.
  • Minimizes the effect of any 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 1500 Positive Bias Relay is designed for applications that require an output pressure that is the sum of a controlled input signal plus a fixed bias.

This pneumatic relay provides high output flow at an output pressure that represents the input signal pressure plus a preset bias.

The output of the relay is the sum of the spring bias, set with the Range Screw, plus a pneumatic input signal. (Po = Ps + K); where Po is output pressure, Ps is signal pressure, and K is the spring constant set by the Range Screw.
Features
  • Control sensitivity of 1" water column.
  • Large Supply and Exhaust Valves.
  • Soft Supply and Exhaust Valve seats.
  • A balanced Supply Valve.
  • Aspirator Tube design.
  • A separate Control Chamber.
  • Unit construction.
  • Allows use in precision applications.
  • Provides high forward and exhaust flows.
  • Minimizes air consumption.
  • Minimizes the effect of any 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)

BSP Connection

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

Diaphragm Material

  • Nitrile on Dacron

Enclosure, Body Material

  • Aluminum

Exhaust Capacity - Relieving Units Only

  • 40 scfm (65 m³/hour)

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)

Standard Features

  • Tamper-Proof

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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