Model 90 Low Pressure Selector Relay

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The Fairchild 90 Low Pressure Selector Relay is designed to select the lower of two signal pressures to provide a continuous output pressure to a control device.


  • 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.

Maximum Signal Pressure
200 psig, [14.0 BAR], (1400 kPa)
Minimum Switching Differential
Less than .1 psig, [.007 BAR], (.7 kPa)
Maximum Differential between Signals
100 psig, [7.0 BAR], (700 kPa)
Ambient Temperature Range
-40°F to +200°F, (-40°C to +93.3°C)
Materials of Construction
Body: Aluminum Alloy
Diaphragm: Dupont Fairprene-coated fabric
Trim: Brass

Catalogue PDF: application/pdf
Operational PDF: application/pdf
Located in: Relays

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