DDSY200 serial meter adopts special energy conversion chips ADE 7755 to carry out energy sampling. Then through a special microcomputer, the energy is processed and transferred into watt degree. By adopting IC card, a two-direction transmission of the energy purchased and consumed between the energy meter and the vending management system is performed. Thus, the products can achieve the functions of energy measurement and electric charge prepayment. At the same time, the watt meter microcomputer can preset, measure and control the user's power use load to prevent the user from danger resulted from exceeding power use load.

Main technical parameters:
*Accuracy 1.0 class, 2.0 class

*Reference voltage (Un): 220V

*Basic current (Ib): 5A , 10A , and 20A

*Overloading multiple: 4 multiples

* Reference frequency: 50Hz

* Operation voltage range: 70%Un~120%Un

* limits of temperature range: -25 ℃ ~ 55 ℃

*Humidity:  <75%

* Display mode: Register and LED displays.

* Life:> 10 years

*Measuring function: The meter can realize a two-direction active energy measurement (Reverse energy charge is counted into forward energy charge)

*Prepayment function:

When the remained energy in the meter reduces to zero, the meter will send out power turn-off control signal and then cut the interior or exterior switch.

* The first-class alarming function. When the remnant energy is 20 degrees less than warning energy, the LED will constantly display the remnant energy to remind the user to purchase electricity as soon as possible.

* Display function: Displaying energy by means of register or LED.

* Memory function: When power supply is cut off, the information in the meter will not be lost.

*.Inspection function: The energy meter can be inspected by the special inspection card and write the information of the meter back into the inspection card.

* The meter is provided with the optical isolated pulse output terminal, which can be used to check the accuracy of the electric energy meter.

* Load control function: When the user's power use value exceeds the maximum setting load value, the watt-hour meter will automatically cut load off.