Summarization:
DDSY949 single-phase LCD/LED-display prepaid electronic meter uses large-scaled integrate circuit, SMT techniques, world-famous branded long-life components and 5+2 digit LCD or 6 digit LED display. It can measure the 50Hz~60Hz single-phase AC active consumption accurately. It meets the standard of GB/T17215-2002. It can be mainly used in the area of pre-paid consumption. The energy bought firstly and then used with the limitation of maximum loading so as to solve the problem in charges. It features good reliability, wide load, low consumption, high accuracy, and good anti-disturbance performance.

Main function and characteristic:
1) Can accumulate both direct and reverse consumption accurately
2) Has separate LED photo-emitter and electrical impulse outputs to show power consumption
3) Can prepay energy consumption; limit the maximum load, secondary alarm for certain balance, data is transferred by encrypted IC card
4) LCD can display the recurrent information of consumption and meter or LED displays the recurrent information of consumption and meter by pushing the button
5) Each meter has its own card; the energy information will never lose even though the card lost
6) Can read information such as balance energy; accumulate consumption and total buying times
7) Alarm for the balance energy and over load
8) The energy selling system can be used for both single phase and three phases
9) Has the port of anti-attacking to store the data for more than 10 years when powered off
10) Good reliability, anti-stealing, wide load, low consumption, high accuracy, good anti-disturbance performance and working for long time without calibration

Technical parameter:
1) Accuracy class: class 1 or class 2
2) Voltage circuit consumption: ≤2W, 10VA
3) Reference voltage: 110V, 120V, 220V, 230V, 240V
4) Basic (max. rated) current: 2.5 (10) A, 5 (20) A, 5 (30) A, 10 (40) A, 10 (60) A, 20 (80) A,
5) Limited working temperature: -30 ~ +65°C
6) Relative humidity: ≤85%
7) Other technical parameter: impulse width 80ms±20ms