LED Digital Electricity Energy Meter

LED Digital Electricity Energy Meter DEM8900

Product operation description

1.1 Description

DEM8900-1/DEM8900-2/DEM8900-3 (short form for DEM8900) is designed by adopting the updated microprocessor and digital signal processing technology, which can be applied for monitoring the electrical system. DEM8900 can measure and analyze the real time electrical parameters, such as I, kWh, kvarh., Meanwhile, DEM8900 has functions of multi-tariff, RS485 communication ( MODBUS protocol), analog output, remote input and electrical pulse output.

All our instruments fulfill all important requirements and regulations concerning electromagnetic compatibility and safety isolation (IEC61000, IEC1010 standard and EN61010 standard). The devices have been developed, manufactured, and tested in accordance with Quality Assurance System ISO 9001.

1.2 Measured scope

The meter can be applied in secondary measure in high and low voltage electrical system. The measured data can be communication transmitted. It can achieve the function of measuring and analyzing parameters for single phase, 3-Ph 3wire and 3-Ph 4Wire system (include unbalance load).

1.3 Measured parameters Current: Class 0.2

Active Power: Class 0.5

Reactive Power: Class 0.5

Active Energy: Class 1.0

Reactive Energy: Class 2.0

Note: 1. DEM8900-1 measure current, active energy, active power (optional, with analog output)

2. DEM8900-2 measure current, reactive energy, reactive power (optional, with analog output)

3. DEM8900-3 measure Current, active energy, reactive energy, active/reactive power (optional, with analog output)

Parameter Setup Meter address: 1 - 247

PT: 1.00 - 99. 00 and 100.0 - 6500.0

CT: 1.0 - 6500.0

RS485 baud rate: 2400 /4800/9600/19200/38400 bps

Pulse Energy Constant: 1- 9600 Passive pulse

Pulse width: 20 - 100 ms

Analog output corresponding: 4 - 20mA or 0 - 5V

Multi-tariff rate: 2 - 12 Interval / alternation time is multiply by 30 minutes

Technical Specification

Current Input Current Input: 5A (Current value can be set up)

Measurement scope: 0.5%~120% In

Overload capacity: 2 X rated continuously, 100A/1s non continuously

Power consumption: less than 0.2 VA per phase

Voltage Input Voltage Input: 400VAC (phase voltage), 693VAC (wire voltage) (Voltage value can be set up)

System frequency: 45~65Hz

Measurement Scope: 3%~120% Un

Overload capacity: 2 X rated continuously, 2500V/1s non continuously

Power consumption: less than 0.5VA per phase

Remote Input (optional) Input channel: 1channel

Input mode: Dry contact

Isolated Voltage: 2500VAC

Analog Output (optional) Output channel: 1 channel programmable

Output signal: 4~20mA or 0~5V (optional)

Response time: less than400ms

Isolated Voltage: 2000VAC

Pulse Output Output channel: 2 channel (active/reactive energy each without power)

Serial Communication Interface (optional)

Channels of output: 1 channel RS-485 interface

Communication protocol: Modbus-RTU protocol

Baud rate: 2400, 4800, 9600, 1920, 38400 bps

Multi-tariff function (optional)

Interval number: 2 - 12 (The ending interval can cross 0:00)

Interval longth: a multiply of 30 minutes

Multi-tariff rate type: sharp, peak, flat, valley

Other parameters Auxiliary power: 85~265VAC/DC (30VDC is optional; 2 is “+” terminal and 1 is “-” terminal when use DC power)

Display type: LED display

Temp. drifting factor