"3#in-3/13#out
SF15~~~~~/KR13~~~~3#in-3/13#out
Senses pressures from 3 to 13 psi in and activates a proportional or differentially controlled pneumatic or electric output. Pressure ranges are factory-set; no adjustment is possible. The input pressure must be greater than the set point for the output to activate. the input can be set at high limits to limit the operation of servos, solenoids, and open/close contacts.
The RP971 is the most economical pneumatic ratio relay when low duty cycle and pressure drop are important. Available in both the 2-way (0.5-1Hz) and 3-way(0.3-3Hz) configurations and with a full set of interchangeable output connectors, it has been designed for a wide range of air conditioning applications. The unit expands and contracts freely to accommodate variations in system pressure and load conditions while using a minimum of power under all conditions.
Pneumatic Two-Valve Ratio Receiver with Signal Relay and Heavy Duty Solenoid Valve"