This is a single-phase two-wire electronic active Energy Limiting Meter, front board, wall mounting, with build-in Energy Limiter inside. It can set the daily maximum load limit.
Besides Energy Limiting function, other common functions of this Energy Limiting Meter (eg: measuring accuracy) completely accord with relevant technical requirements of class 1 single phase active energy meter, stipulated in international standard IEC 62053-21.
There are 50Hz or 60Hz 2 type meters available which can accurately and directly measure 50Hz or 60Hz active energy consumption from single phase AC electricity net.
It can be installed to use indoor.
This RS485 On-line Pre-paid Energy Limiting Meter is ideal in SOLAR, WIND or HYBRID POWER etc some new power plants.
It’s suitable for applications where the amount of energy is limited or rationed per day.
It’s useful for tenants, rugged or remote villages, isolated islands.
It’s easy management remote and centralized.
It also can be equipped for requiring subsidized billing.
This RS485 On-line Pre-paid Energy Limiting Meter has pre-paid function to manage and sale energy consumed, remote and centralized.
This Meter managed through M-DCU and S-DCU by RS485 On-line.
The simplest RS485 On-line Pre-paid Energy Limiting Meter is aunique new energy meter that limits energy consumed per day to prevent energy over use.
The built-in MCU handles all metering and control function.
This Meter is equipped with a real time clock and a load relay.
This Meter also has warning LED indicator to show the status of load relay.
And it is equipped with Overload Current Protection to make it more safer.
In theory, each M-DCU could manage 256pcs S-DCU within 2km, each S-DCU could manage 256pcs meters within 2km.
The administrator operate computer to manage through M-DCU first by RS485 on-line, then S-DCU, then to meter.
Each Meter has pre-paid function. After user purchased energy beforehand, the meter start to work.
Each Meter can set the starting time (eg: 6:00pm) everyday when the new allocation will begin. As soon as the designated time (6：00pm) is reached, the new allocation will take effect.
Each Meter can set daily limit of energy consumed.
When the daily limit is reached, the buzzer will beep for alarm first ( beep 1 sec after 4 sec ), then the meter will automatically cut off the load power, until the next day, an new kWh allocation is provided and take effect when the designated starting time (6:00pm) is reached.
When purchased energy used up, the meter will also automatically cut off the load power, until user purchased new energy.
It runs in circle this way.
▲ managed remote centralized by RS485 on-line
▲ Pre-paid function
▲ Daily Energy Limit
▲ Overload Current Protection
▲ Load Relay Warning LED Indicator
▲ Buzzer Beep Alarm
▲ 6-digits LED display
▲ Programm in computer setup/management
▲ Build-in Real Time Clock
▲ Build-in MCU, Standalone Operation
▲ Accuracy Class 1.0
▲ Front Board/Wall Mounting
▲ Wide Rage Current Measurement
▲ Easy Installation & Easy Setup
▲ Light Weight & Good Reliability
(1). Overload Protection :
Usually the maximum current for the Energy Limiting Meter is 10A only.
When the current reach 20A, the meter will turn off in 30 seconds;
When the current reach 30A, the meter will turn off in 15 seconds;
When the current reach 40A, the meter will turn off in 5 seconds.
If the meter overload, LED is blinking "P_OV".
The Energy Limiting Meter will restore after 30 seconds for over-load off. If over-load is still there, it
will perform the over-load protection process.
After 10 attempts, it will stop the restore operation.
At this time, the users have to restore it manually.
Buzzer will beep when alarm energy ( Watthour ) is reached, beep 1 second, after 4 seconds beep 1 second again, in 5 seconds cycle, till the limit is used up.
The RS485 On-line Pre-paid Energy Limiting Meter can be set/controlled by
★ Programm in computer.
Hand Held Unit Function
Hand Held Unit is use for setting the meter parameters, such as Daily Limit, Alarm Energy, Time, Date, Power On ( Relay ) etc. It can connect with Energy Limiting Meter directly by RJ11 port.
The basic functions as:
15 keys & 16 x 2 LCD display
No battery required (RJ11 powered)
Build-in real time clock and calendar
Set Starting Time
Set Daily Usage Limited kWh ( Energy )
Set Daily Usage Limited kW ( Active Power )
Set Power on ( Load Relay restore )
Set Daily Maximum Power Limit ( Overload )
Rate Voltage ( V )
Rate Current ( Ib/Imax ) A
Operating Current Range(A)
220 ~ 240
5 ( 20 ) A
0.04% Ib ~ Imax
Reference Voltage (Un)
220 ~ 240 V AC
1 phase 2 wire
187 ~ 288 VAC
AC Voltage withstand
2 KV for 1 minute
Rate Current (Ib)
5 A direct connection
Maximum Rates Current (Imax)
20A & 40A direct connection
Operating Current Range
0.4%Ib ~ Imax
Operating Frequency Range
50 Hz ± 10%
Internal Power Consumption
Operating Humidity Range
Storage Humidity Range
Operating Temperature Range
-20℃ ~ + 55℃
Storage Temperature Range
-30℃ ~ + 65℃
6-Digits Register, LED Display (L)
Overall Dimensions (W x H x D)
W: 177 mm x H: 116 mm x D: 66 mm
Overall Dimension Installation