Shanghai Metering developed six types of the Sanmix series prepayment metering system, up to end of 2005, about 1.8 million prepayment meters installed in market.
 Smart Card (Key), developed in 1992, installed 1.4 million meters in market. |
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| Remote Control, developed in 2002, installed 0.3 million meters in market. |
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| RF wireless, developed in 2002 , installed 0.15 million meters in market. |
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| PLC Control developed in 2004, installed 0.02 million meters in market. |
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| Key Pad developed in 2003 installed 0.03 million meters in market. |
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| One Card for All . developed in 2004, installed 0.01 million meters in market. |
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Brief Introduction of
Remote-controlled Prepayment Watt-Hour Meter
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1. Introduction
Remote control （ RC ） Prepayment system is composed of prepayment watt-hour meter, RC controller, energy dispenser device, and management software. RC controller is a carrier for data exchange between meter and management system. The system could make it easy to control and manage electricity consumption.
The prepayment watt-hour meter has been improved on constantly. It is very popular in China and welcomed by the customers, due to it's advanced design, sound quality, flexible setup, competitive price, and good technical support.
2. Function & Character
The current signal and voltage signal will be sent to a special integrated circuit after sampling and dividing, and then treated by special CPU chips to obtain the pulse signal of frequency positive rated to load consumption power. the pulse signal to be sent to LED, and the value of power passed the meter will be indicated by the speed-ratio of pulse number/kWh. Even the connection is not correct which causes the adverse power; the meter can also be recorded the data correctly.
Point-of- sale terminal set up a customer's file in power sale system software, and initialize the RC controller with the system software, and provide it to the user. The user must pay in advance proper amount of credit amount at point-of- sale terminal in order to use the electricity with the RC controller.
| 1. | Long-distance digital impulse output, corresponding collection reading system and timely supervision for working statue. |
| 2. | Controlled by the Mircro-PC with Advanced SCM, measured digitally and with smart anti-tampering function (no influence in measurement and keep record if connection is in reserved between input and output wire. |
| 3. | Over-current control; cut the circuit and recovery in 3-5 minutes under the case of that load current is more than 15% of Imax for 10~15 seconds. |
| 4. | Dates are assured completely security, correct and reliable, as RC controller has been multi-encrypted |
| 5. | Both Meter and Power-selling Management System could read the RC card that could re-record the remains, accumulative energy and working status of meter. |
| 6. | Six-digital LED will display the remained and accumulative energy and current power alternately when rate reaches n: 1 |
| 7. | The Alarm for over is the indication to input urgently new energy. Overdraw some energy temporarily through RC controller, and meter will flash and display the remains. |
| 8. | Break off automatically as the borrowed energy has been over the allowance ( 100kW h). Be inputted fresh energy and recovery, meanwhile, be reduced the borrowed energy. |
| 9. | That be adopted the magnetism relay is sure the break-off security, little consumption and without pasting among contacts of relay |
| 10. | It keeps data security automatically once power failed, and recovery completely as power back. |
| 11. | Power-selling management system is made up of the PC＋RC ED device＋Management software . |
| 12. | Meter could work on the base of that only any one of three phases has the electricity |
| 13. | The meters with current of 5(20) A \10(40A)\20(80) A all have been set inside a magnetism relay, which are connected through output and input wire. |
| 14. | The meter with the current of 6A or below regularly should be connected to a current mutual inductor (input the ratio of 1-250 into meter through RC controller), realizing to control AC contactor just like switches |
3. Specification & Technical Index
Description |
Single Phase Prepayment Electronic WattHour Meter |
Three Phase Prepayment Electronic WattHour Meter |
Type |
SM1800 |
SM3800 |
Accuracy Class |
1.0 |
1.0 |
Power Consumption (VA) |
<3 |
<8 |
Reference Voltage (VA) |
220V ,230v 50(60)Hz |
3*220V, 3*230V |
| 3*100V 50(60) Hz | ||
Basic Current （ A ） |
5(30) 10(40) 20(80) 30(100) |
1.5(6) 10(40) 20(80) |
Main Function: |
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| Full sealing Design for RC controller | ||
| Easy to operate, high sensitivity, long-life design | ||
| Especially encoding RC controller | ||
| Can measure the active energy of single phase or three-phase system of 50Hz and 60Hz prepay energy. | ||
| Maximum Load Limit and overload alarm can be preset. | ||
| Minimum Remaining Energy Limit alarm. | ||
| Automatically switch off when the remaining energy down to zero. | ||
| Display the data of total energy, remaining energy, in the meter and many infomations in Management System . | ||
Transmitting data through the RC controller |
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Main Characteristics |
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High accuracy of class |
1.0 |
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High reliability |
Service life more than 10 years. |
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Display |
Total Energy consumption is indicated by the register, and the corresponding state is displayed by the LED. |
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Technology |
The manufacturing adopts the surface mount technology (SMT). |
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Standard |
The EMC of the meter conform to IEC61036-2000 standard. |
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Managing system |
To afford facilities for the user, Single Phase Meter and Three Phase Meter can use the same managing system. |
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Low power consumption and tamper proof function |
Low power consumption, mini volume; tamper proof function and no confined condition for installation. |
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Load switch |
It adopts the load switch with high overload capability and magnetic retainable relay switched by high reliability impulse |
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