DDSF89 Single phase multi rate electronic energy meterDetailed product description：

The DDSF89 single-phase multi rate electronic energy meter consists of a single-phase metering unit, a multi rate unit, and a communication unit; Using high-quality imported specialized measuring chips for measurement, and built-in relays for remote power on/off and load control functions; Built in RTC clock can achieve multi rate function; The table also uses a Chinese character LCD screen to display various data and information; And it has infrared (optional), M-BUS (RS485) or carrier communication interfaces. This meter has significant advantages such as high measurement accuracy, good stability, strong overload capacity, and high reliability, and can be used to measure single-phase AC active energy with a frequency of 50Hz; It is the preferred measuring instrument for implementing time-sharing metering in the power sector.

Product features
1. Remote power on/off function: Remote power on/off function can be achieved through M-BUS/RS485 communication.
2. Alarm function
2.1. The maximum power allowed can be set. If the electrical load continuously exceeds the maximum power within the set time, the energy meter will provide a power-off reminder; When the recovery time (adjustable) is reached, power will be automatically restored.
2.2. When the electricity meter shows an abnormality, the LCD displays the corresponding code alarm
3. Multi rate function
3.1. Measure the peak, off peak, off peak, and off peak electricity rates in both forward and reverse directions. Accumulate the reverse electricity and include it in the forward electricity rate. At the same time, measure the reverse electricity rate separately.
3.2. Automatically save current power data and the last 12 months' power data.
3.3. Four fees for peak, off peak, off peak, and off peak periods, with a maximum duration of 10 days; Automatically freeze the monthly electricity data on the meter reading day, and support manual freezing of current electricity data through RS485.
3.4 M-BUS (RS485) or infrared, carrier communication interfaces can be used for parameter settings and can read relevant data from the energy meter.
4. Event recording function
4.1. Automatically record at least the last three programming times and programming content
4.2. Automatically record the start and end times of the last three instances of electricity meter overload.
4.3 Automatically record the start and end times of the last three remote power outages.
5. Other functions
5.1 Key display function: Press the blue button on the energy meter panel to alternately display relevant data and information.
5.2 During a power outage, press the blue button on the energy meter panel to wake up the meter and display relevant data and information alternately.
5.3. The red button is the programming permission button. Before programming the electricity meter, press this button once. After programming is complete, press the button again to cancel the programming permission; This key is protected by a lead seal.

technical parameters
1. Specifications
Voltage:~220V
Current: 1.5 (6) A5 (20) A5 (30) A10 (40) A15 (60) A20 (80) A
Accuracy level: 1.0 level, 2.0 level
Constant: 6400 imp/kwh, 3200 imp/kwh, 1600 imp/kwh, 800 imp/kwh
Starting current: 0.4% Ib
Stealth: equipped with anti creep logic circuit
2. Basic error

current value	power factor	Percentage error limit
0.05Ib 0.1Ib~Imax	one	±1.5 ±1.0
0.1Ib	0.5 (Sensory) 0.8 (capacitive)	±1.5
0.2Ib~Imax	0.5 (Sensory) 0.8 (capacitive)	±1.0

3. Performance indicators
3.1 Working voltage:~154V -~264V
3.2. Power consumption of the whole machine: less than 2W
3.3 Working temperature: -30 ℃ to+60 ℃
3.4. Extreme working temperature: -40 ℃ to+70 ℃
3.5. Relative humidity: 25% to 95%
3.6 Clock accuracy: better than 3S/d at operating temperature
3.7. Battery capacity: 1.2AH
3.8 Display: Chinese character LCD screen (optional with backlight panel)
3.9 Communication interface: RS485 (M-BUS), infrared (optional) or carrier wave
3.10. Communication baud rate: can be set within the range of 1200, 2400, 4800, 9600bps, default 1200bps
3.11. Dimensions: 172mm × 115mm × 67mm
3.12. Weight: Approximately 0.75kg