The new microcontroller based MPRCC is a multistage electronic capacity controller for multi cylinder reciprocating compressor or rack systems. LCD based unit has easy to use settings, like set point- Low pressure (LP), Neutral Zone (NZ), Inter-stage differential (ISD) & Interstate timer. One Analog input (4 to 20mA) for pressure transmitter e.g. compressor suction or RTD Pt100 One Digital input (potential free) for Compressor on feedback Four/ Six Relay Output for Compressor Capacity Control Solenoid Valves and Compressor trip Adjustable time delay for capacity control solenoid valves Adjustable Neutral Zone, Inter Stage Differential, Calibration Optional RS232/ RS485 port for communication optional available software for PC monitoring.