... and power management system. 2.Technical Measure- Measurement: VL1, VL2, VL3,AL1, AL2, AL3, F,∑P, P1,P2,P3, ∑Q, Q1 ... humidity: 5% ~ 95% (no condensation) - Altitude: < 2500m 3. Options- Communication (/C) :RS485 (Modbus-RTU); 1 start bit, 8 data bit, 1 ...