DDSF879 series electronic single-phase multi rate energy meterDetailed product description：

The DDSF879 series electronic single-phase multi rate energy meter is a new metering product developed to meet market demand. The product is manufactured using advanced foreign energy metering chips, high-performance CPUs, RTC clock chips, displays (meters), and SMT advanced processes. Its characteristic is the ability to measure electricity according to different time periods, with advantages such as four rate, twelve time periods, anti-theft, high precision, high reliability, high overload, low power consumption, and light weight. The rates for peak, off peak, flat, and valley periods can be set as needed.

The electric energy meter adopts a dedicated filtering network, which has strong anti-interference ability.

This product adopts national standards such as GB/T17215-2002 "Level 1 and Level 2 Static AC Active Energy Meters", GB/T15284-2002 "Special Requirements for Multi Rate Energy Meters", and DL/T614-1997 "Multifunctional Energy Meters" in the power industry. The electric energy meter has infrared communication port and RS485 communication port, and the communication protocol complies with the power industry standard DL/T645-1997 "Multi functional Electric Energy Meter Communication Protocol". The quality management system for producing this product has passed GB/T19001 (ISO9001) certification.

The power supply department can use a dedicated programmer to set rates, time periods, dates, programming passwords, and other content through infrared or RS485 interfaces; Read various information on the energy meter except for the password through a dedicated meter reading device, and perform time synchronization under legal authorization. The infrared communication distance shall not be less than 4 meters, and the communication angle shall not be less than 15 degrees. The meter reader can transmit data to the computer. Users can choose the EIA-RS485 interface according to their needs.
Note: The LCD liquid crystal display carrier multi rate energy meter has the functions of power line carrier meter reading and remote load control.

Structure:
The case is sealed and dust-proof, flame retardant and anti-aging.
Equipped with infrared communication port and RS485 communication port.
One red LED light indicates the power pulse, and the pulse light flashes once every time the meter accumulates one pulse equivalent of electrical energy.
One optocoupler isolated pulse output, with an output width of approximately 80ms, for verification purposes.
Using long-lasting, ultra bright LED lights for time period indication.
The battery display adopts three forms: dual meter, LCD liquid crystal display, and LED digital tube display. Under normal usage conditions, the lifespan of its display is greater than 10 years.
The working power supply adopts transformer isolation.
There is a programmable control switch inside the electricity meter, and a power pulse output port and RS485 interface are installed on the wiring terminal block.

Technical parameters:
Rated voltage (V): 220230
Working voltage range: 70% Un~120% Un
Rated current (A): 5 (20), 5 (30), 5 (50), 10 (40), 10 (60), 15 (60), 15 (90), 20 (80), 10 (100)
Rated frequency (Hz): 50, 60
Accuracy level: Level 1, Level 2
Power consumption: Voltage circuit ≤ 2W, 10VA; Current circuit ≤ 1VA
Working temperature (℃): -25~+55, extreme working temperature (℃): -45~+70
Relative humidity: ≤ 75% (annual average)
Rate: Two/three/four rate options are available; Time period: ≥ 8
Clock accuracy: 0.5s/d (23 ℃), with a change in temperature of better than 0.1s/(d ·℃)
Battery capacity (Ah): ≥ 1Ah, maintaining normal clock operation for no less than 10 years
Dimensions (mm): (LCD, LED display); (Dual meter display).
Average service life (years):>10

function
Measure positive and negative active energy, and accumulate negative energy in the positive direction.
Electric energy is accumulated and stored separately based on total, peak, flat, and valley values.
It has automatic meter reading function, specifying any hour on a certain day of the month as the meter reading time, and can store 12 months of historical electricity consumption.
Automatically switch between calendar, timing, and leap year.
Capable of displaying various parameters such as date, time, rate, and power consumption according to user requirements.

Scope of application:
220V5 (20) A - ---10 (100) A is a direct access instrument suitable for implementing time of use pricing for urban and rural residents' lighting meters.