Overview Pneumatic relay produces a modulating pressure output, and controls pneumatic valve or damper actuators in sequence from a single thermostat. Replacements 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. Product Specifications ApplicationPneumatic, Four Port Ratio Relay Airflow Usage0.002 scfm (1.0 mL/s) maximum Dimensions (in.)2 in. diameter x 2 5/8 in. deep Dimensions (mm)52 mm dia. x 67 mm deep Maximum Safe Operating Pressure (psi)30 psi, maximum Maximum Safe Operating Pressure (kPa)205 kPa, maximum Temperature Range (F)0 F to 140 F Temperature Range (C)-18 C to +60 C Includes14003030-002 Mounting Clip and scaleplate with kPa markings MountingWall or In-line or panel Operating Humidity Range (% RH)5 to 95% RH Pressure Range (psi)Output Span--3 to 13 psi Pressure Range (kPa)Output Span--21 to 90 kPa ActionDirect Acting Air connectionsBarb fittings, Port 1: 1/4 in. (6 mm) O.D. plastic tubing; Other Ports: 5/32 in. (4 mm) O.D. plastic tubing Capacity0.039 scfm at 1 psi differential (18 mL/s at 5 kPa differential) OperationProduces modulating pressure output proportional to pilot pressure input changes Pilot Start Pressure (psi)Adjustable 0 to 10 psi Pilot Start Pressure (kPa)Adjustable 0 to 69 kPa