DTSYF/DSSYF79 electronic prepaid multi rate electricity meterDetailed product description：

I. Overview
The DTSYF-79/DSSYF-79 three-phase electronic prepaid multi rate electricity meter (hereinafter referred to as the "instrument") is designed and manufactured based on the actual electricity consumption of residents. It has high accuracy and reliability.
This instrument adopts advanced energy metering and single-chip microcontroller integrated dedicated chips, designed in combination with mature multi rate and prepaid technologies, and is a high-tech product manufactured using 16 bit digital sampling processing technology and SMT process. The key components are selected from internationally renowned long-life devices, which improves the reliability and service life of the product. The data display adopts a large screen LCD, which is convenient for meter reading.
This instrument can realize functions such as time-sharing metering prepayment, setting daily meter reading, handheld computer programming, and meter reading; Can set 2 time zones, 4 rates (peak T1, peak T2, flat T3, valley T4), 12 daily time periods, and 12 public holidays; And it has infrared and 485 communication functions, which can achieve long-distance meter reading. The communication protocol can support DL/T 645-1997 "Multi functional Energy Meter Communication Protocol", providing necessary conditions for electricity automation management.
Its performance indicators comply with the technical requirements for electronic active energy meters in GB/T 17215-2002 "Level 1 and Level 2 Static AC Active Energy Meters", the technical requirements for multi rate energy meters in GB/T15284-2002 "Multi rate (Time of use) Energy Meters", and various technical requirements in GB/T18460-2001 "IC Card Prepaid Electricity Sales System".

2、 Main functions of DTSYF/DSSYF79 electronic prepaid multi rate energy meter
Prepaid multi rate energy meters have the following basic functions:
① Forward and reverse time-sharing active power metering, divided into four rates (T1, T2, T3, T4), twelve time periods, and two time zones
② Infrared communication, programming settings, and meter reading can be performed through a handheld computer
③ All data parameters can be viewed by pressing the button (can be viewed by clicking or double clicking the lookup key)
④ Record the total active power consumption and hourly power consumption for 12 months, and the data can be collected through infrared or 485 methods
⑤ Wide temperature large screen LCD backlight 6+2 digital display; Memory data is guaranteed not to be lost after power failure
⑥ Having the ability to purchase electricity before using it, and automatically freezing the monthly electricity consumption rates on designated meter reading days
⑦ IC card can be used for parameter settings and supports high-capacity meter reading function (one card can read electricity data from 169 households)
⑧ Overload power-off protection and recording function (aimed at protecting the circuit breaker from burning out due to long-term overload)
⑨ Real time measurement and display of parameters such as voltage, current, and power
⑩ Fault self diagnosis function (diagnosis scope includes load switch, EEPROM, IC card data)
⑪ Can set non working hours and emergency credit periods without interruption on public holidays
⑫ Equipped with power on/off recording function (saving the last 5 power on/off time records)
⑬ Equipped with lid opening record function (saving the last 5 lid opening and closing time records, stacking the number of lid openings)
⑭ Equipped with real-time clock, voltage, and current display functions; Monitor and display the operation status of power supply, power grid, and electricity meter
⑮ Equipped with an external sound alarm output interface (optional)
⑯ Equipped with built-in sound and light alarm, trip and power-off functions (optional external alarm output interface)
⑰ When overloaded, can the alarm and trip signal outputs be controlled by selecting whether to allow alarm tripping
⑱ When the remaining power is less than or equal to the alarm set value, the alarm and trip signals can be controlled by selecting whether the meter allows for alarm and trip
⑲ When the remaining power is zero, the meter outputs a trip signal

3、 Technical Specifications for DTSYF/DSSYF79 Electronic Prepaid Multi Rate Energy Meter
4.1 Accuracy Level Active 1.0 2.0
4.2 Reference voltage 3 × 220/380V 3 × 57.7/100V (three-phase four wire) 3 × 100V (three-phase three wire)
4.3 Rated current 3 × 1.5 (6) A, 3 × 5 (20) A, 3 × 10 (40) A, 3 × 15 (60) A, 3 × 20 (80) A
4.4 Rated frequency 50Hz
4.5 Starting current level 1: ≤ 0.002In (connected via transformer), ≤ 0.004Ib (directly connected)
Level 2: ≤ 0.003In (connected via transformer), ≤ 0.005Ib (directly connected)
4.6 Stealth with anti creep logic design
4.7 External dimensions 278mm ´ 174mm ´ 77mm
4.8 Weight approximately 2.5kg
4.9 Electrical Parameters

Normal operating voltage	0.9Un～1.1Un
Extreme working voltage	0.75Un～1.15Un
Voltage line power consumption	≤ 2W and 5VA
Power consumption of current circuit	＜1VA
Data backup battery voltage	3.0VDC

rate number	four
Number of time periods	twelve
Number of time zones	two
Measurement range	0～999999.99 kWh
Display	LCD with backlight source
Baud rate	RS485:1200bps～9600 bps、 Infrared port: 1200bps
communication protocol	DL/T645-1997 Multifunctional Energy Meter Communication Protocol