Fairchild Pneumatic High Pressure Selector Relay, Model 91
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Model 91 High Pressure Selector Relay

Brand: Fairchild Industrial Products

Fairchild Pneumatic High Pressure Selector Relay, Model 91 Fairchild Pneumatic High Pressure Selector Relay, Model 91 Fairchild Pneumatic High Pressure Selector Relay, Model 91
The Rotork Fairchild Model 91 High Pressure Selector Relay is designed to select the higher of two signal pressures and to provide a continuous output pressure (or pressure range) to a controller. 
 
The ability to precisely control pressure switching and pressure monitoring functions makes the Model 91 the logical choice in dead-end or low-flow applications such as precision control loops.
 

Fairchild Model 91 High-Pressure Selector Relay - SKU: 91052

The Fairchild Model 91 High-Pressure Selector Relay is designed for precise and reliable performance in high-pressure applications.

Key specifications include:

  • Maximum Signal Pressure
    • 200 psig
    • 14.0 bar
    • 1400 kPa
  • Minimum Switching Differential
    • < 0.1 psig (0.007 bar, 0.7 kPa)
  • Maximum Differential Between Signals
    • 100 psig (7.0 bar, 700 kPa)
  • Pipe Size
    • 1/4” NPT

Constructed with a durable aluminum alloy body, brass trim, and a Dupont Fairprene-coated fabric diaphragm, this relay ensures longevity and efficient operation under demanding conditions.

Features
  • Small, rugged design suitable for installation where space is limited.
  • Soft seat construction to assure positive shutoff.
  • Low selection differential to allow precise control of switching.
  • Fast response that is suitable for control in critical loops.
  • Automatic switching that eliminates manual monitoring of signal pressure.

Specifications

Brand

BSP Connection

  • 1/4" BSPT Female

Ambient Temperature Range

  • -40° to 93° C (-40° to 200° F)

Differential Between Signals - Maximum

  • bar: 7
  • kPa: 700
  • psig: 100

Trim Material

  • Brass

Differential Between Signals - Minimum

  • > psig: 0.1 (bar: 0.007, kPa: 0.7)

Enclosure, Body Material

  • Aluminum Alloy

NPT Connection

  • 1/4" NPT Female

Elastomers

  • Dupont Fairprene-Coated Fabric
  • Fluorocarbon (Viton)

Signal or Output Pressure - Maximum

  • bar: 14
  • kPa: 1,400
  • psig: 200

Mounting

  • None

Relief

  • Relieving

Vent

  • Straight

Sensitivity

  • Switching Differential: < 0.1 psi (< 0.7 kPa) - Max.

Documentation

Data Sheets

Catalogs

Certifications & Approvals

Installation Instructions

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