Fairchild Model 90/91 - Hi & Low Selector Relay

The Fairchild Model 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.The Model 90 is recommended for dead end or low flow service in critical applications such as control loops requiring precise, automatic monitoring of signal pressures.

The 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 switching and pressure monitoring make the Model 91 the logical choice in dead end or low flow applications such as precision control loops.

Some of the features of the Faichild Model 90/91 include:

• Small, rugged design suitable for installation where space is limited
• Soft seat construction to assure positive shut off
• 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