... measuring Applicate in power system,building automation DW series 3-phase True Effective Value Energy Meter(RMS)DW/MDW ... three wire two factors, three phase four-wire selectable.3) Output:3-line alarm output configurable,up to 8 segment output ... Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer Relay, Solid State Relay, Proximity Sensor, ,Pressure sensor ,load cell ...