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Model 1500A High Flow Positive Bias Relay

Brand: Fairchild Industrial Products
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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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.

Specifications

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