... time, frequency-conversion pump will be changed to pump of commercial power supply, and one pump of commercial power ... detection fault, external equipment fault, external disturbance, water lack protection, pressure protection, line disconnection protection.DisplayLED ... centigrade~+50 degrees centigradeEnvironment HumidityBelow 90% (no water-bead coagulation)Vibration StrengthBelow 0.5g (acceleration) ...