This leaflet describes Maihong's multi‑rate energy meters (DDSF‑121, DTSF‑121, DDZY‑121, DTZY‑121, DTSD‑121) with their features, technical specifications…
Maihong Electric Technology Co., Ltd. is a Chinese manufacturer of single‑ and three‑phase mechanical and electronic energy meters, including multi‑rate, remote‑charge‑control, and multifunction models. The company offers OEM/ODM services and exports to many regions.
The multi‑rate meters support four tariffs (sharp, peak, flat, valley) across up to ten time periods with a minimum 5‑minute interval, store up to 12 months of data, and provide high‑precision measurement with advanced metering chips, CPU, and RTC. They also feature pulse input, password‑protected programming, and communication protocols compliant with DL/T645‑1997. This manual is written in Chinese.
| Number of tariffs | Four (sharp, peak, flat, valley) |
|---|---|
| Data storage capacity | 12 months of tariff data |
| Provisional voltage range | 90%Un – 110%Un |
| Expanded voltage range | 80%Un – 115%Un |
| Transformer access current | 1.5 A (6 VA) |
| Direct access current options | 2.5 A, 5 A, 10 A, 15 A, 20 A, 30 A |
It supports a provisional voltage range of 90% Un to 110% Un and an expanded range of 80% Un to 115% Un.
The meter can store tariff data for the current month and the previous eleven months, a total of twelve months.
The meters use the DL/T645‑1997 communication protocol.