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Honeywell RP971 Pneumatic Ratio Relay

Pneumatic Ratio Relay

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.

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

Select a link under the "item" tab below to order.

Cat #Includes
RP971A100714003030-002 Mounting Clip and scaleplate with psi markings
RP971A101514003030-002 Mounting Clip and scaleplate with psi markings
RP971A102314003030-002 Mounting Clip and scaleplate with kPa markings
RP971A103114003030-002 Mounting Clip and scaleplate with kPa markings
Type: Pneumatic, Four Port Ratio Relay
Dimensions, Approximate: 2 in. diameter x 2 5/8 in. deep (52 mm dia. x 67 mm deep)
Action: Direct Acting
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)
Operation: Produces modulating pressure output proportional to pilot pressure input changes
Operating Humidity Range: 5 to 95% RH
Temperature Range: 0 F to 140 F (-18 C to +60 C)
Maximum Safe Operating Pressure: 30 psi (205 kPa)
Pilot Start Pressure: Adjustable 0 to 10 psi (Adjustable 0 to 69 kPa)

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