Single Phase Din Rail Type Multi-function Energy Meter, Tyep DDS238-4 ZN

The meter is designed to measure single phase two wire AC active energy with time of use (TOU) function (the power flow of sharp time ,peak time, flat time and off-peak time)
and variable parameter. All of its functions comply with the relative technical requirement for class 1 single phase watt hour meter in IEC62053-21 and its data communication
rules obey the requirement of DL/T645 or MODBUS-RTU. It is a long life meter with the advantage of high stability, high over load capability, low power loss and small volume.

Basic Function 
1.LCD display, backup battery for LCD display at power failure 
2.Bi-directional total active energy measurement and TOU active energy measurement ,reverse active energy measure in the total active energy 
3.The meter also display real voltage, real current, real power, real power factor, real frequency, real time and date
4.The meter has 4 kinds of tariff defined as sharp,peak,flat and off-peak. the meter can be programmed as single tariff , double tariff and three tariff or four tariff. 
5.The meter has 14 programmable interval tables, of which can set up to 14 intervals as four tariff during 24 hours，the minimum units of each tariff interval can be set up as 1
minute
6.Pulse LED indicates working of meter，Pulse output with optical coupling isolation
7.Energy frozen daily (last 30 days) and monthly(last 12 months),all data store for 10 years at power failure
8.Infrared and RS485 communication port
9.The meter can automatically switch calendar and leap year
10.Event log
11.35mm din rail installation 

Optional Function
1.LCD with backlight, can see in dark
2.Remote control function, the meter has function of remote control on/off through RS-485（DDS238-4 ZN/R type）
3.the meter can measure and display the total forward/reverse active energy
4.Accumulative working time display and reset energy function (these two data can be reset to zero with keypad in meantime)