| Product introduction | |||
EMT-1PS single-phase electronic watt hour meter adopts the most advanced solid-state integrated circuit technology, with ultra-low power consumption and SMT technology. It is used to measure AC single-phase active electric energy with a frequency of 50/60Hz. The performance indicators meet the technical requirements of single-phase static electric energy meters in IEC62053-21-2003 and GB/T17215.321-2008 AC Static Active Energy Meters (Class 1 and 2). The communication protocol shall comply with DL/T645-1997 and DL/T645-2007 Communication Protocol for Multifunctional Electric Energy Meters or MODBUS. | ||||
Product performance and parameters | ||||
1）Specifications | ||||
Type | Class index | Reference voltage | Rated current | |
EMT-1PS | Class 1 | 220V,230V | 6(1.5)A,20(5)A, 32(5)A, 50(5)A,40(10)A, 60(10)A,60(15)A | |
2）Basic error (Ib is the basic current, Imax is the maximum current) | ||||
Load current | Power Factor | Elementary error (%) | ||
Class 1 | Class 2 | |||
0.05Ib≤I＜0.1Ib | 1 | ±1.5 | ±2.5 | |
0.1Ib≤I≤Imax | 1 | ±1.0 | ±2.0 | |
0.1Ib≤I＜0.2Ib | 0.5L(lag) | ±1.5 | ±2.5 | |
0.8C(advance) | ±1.5 | － | ||
0.2Ib≤I≤Imax | 0.5L(lag) | ±1.0 | ±2.0 | |
0.8C(advance) | ±1.0 | － | ||
3）Starting: when reference voltage, reference frequency and power factor is 1.0, the meter of class 1 under 0.4%Ib, the meter can start and do measurement normally. | ||||
4）No load running: the meter has anti-shunt running logic circuit. when voltage circuit plus 1.15 times reference voltage, and there is no current in current circuit, the test output of meter is supposed not to have more than one pulse. | ||||
5）Power consumption：≤2W（10VA） | ||||
6）Environment condition | ||||
standard working temperature：-25℃～70℃ | ||||
limit of working temperature：-25℃～80℃ | ||||
note: Special requirement of working temperature limit：-40℃～80℃ Working Principle | ||||
The measuring chip samples the voltage and current signals and converts them into pulse signals which are proportional to energy. The signals are transferred to MCU chip to do the accumulation measurement, and output in passive pulse with optocoupler isolation. MCU and exchange and communicate data with the outside world meanwhile. | ||||
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