DDSY7999 Single Phase Prepayment Watt- Hour Meter HJTIS LCD Over Load Protection

DDSY7999 Single-phase Prepayment Watt-hour Meter HJTIS LCD Over-load Protection

PRODUCT BRIEF INTRODUCTION
The Single Phase STS Key-pad energy meter adopts the most advanced solid-state and integrated circuit technology featured in super low power loss and advanced SMT technology for measuring AC single-phase active power.The product complies with IEC 62053-21“Part21, The Special Requirements for Energy Measuring Equipment: Level 1and Level 2 of StaticAC Energy Meter”and other standards.Communication protocol adopts IEC 62056-21 standard. The 20-bit code in STS algorithm is in accordance with the related standards stipulated in IEC 62055 standard transmission specifications (STS).

FUNCTION FEATURES
Record the total currently consumed active positive energy, but the reversal energy is also to be added positively into total energy. No need of recalibration for long term.
The key pad consists of the numbers from 0 to 9 plus Enter and Exit keys. A 30 ms' waring tone will sound when a key is pressed.
Buzzer alarm, low-credit alarm.
Hoarding proof, Over-load protection.
Prepaid function. The user will get a bunch of 20-bit charging token from the power utility after they have purchased power from there. They need put the token into the meter by key pad.
Expandable infra red and RS 485 communication.
Clear and reliable LCD display.
Adopts photoelectric-isolation energy pulse to output signals, which can be used to detect errors. The emitting diode indicates the energy consuming status.

MAIN TECHNICAL DATA