4 Port Ratio Relay (5 psi input span for 3 to 13 psi output)

A four port non-bleed pneumatic relay which produces a modulating pressure output, proportional in a fixed ratio to pilot input changes. It is used to control pneumatic valve or damper actuators in sequence from a single thermostat. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.

Features

• Adjustable pilot start point pressures.
• Two pilot pressure spans available.
• Four sharp-barb air connections.
• Molded plastic construction with neoprene.
• Mounting clip provided.

Specifications

• Description: Wall, In-Line or panel mounted Pneumatic Four Port Ratio Relay
• Type: Pneumatic, Four Port Ratio Relay
• Action: Direct Acting
• Operation: Produces modulating pressure output proportional to pilot pressure input changes
• Airflow Usage: 0.002 scfm (1.0 mL/s) maximum
• Air Connections: Barb fittings, Port 1: 1/4 in. (6 mm) O.D. plastic tubing; Other Ports: 5/32 in. (4 mm) O.D. plastic tubing
• Capacity: 0.039 scfm at 1 psi differential (18 mL/s at 5 kPa differential)
• Mounting: Wall or In-line or panel
• Maximum Safe Operating Pressure (psi): 30 psi
• Operating Humidity Range (% RH): 5 to 95% RH
• Temperature Range: 0 F to 140 F
• Output Span: 3 to 13 psi
• Pilot input span: 5 psi input span for 3 to 13 psi output
• Pilot Start Pressure: Adjustable 0 to 10 psi