Why Buy a Remote Smart Meter Based on the Accuracy Level?

When we buy a remote smart meter, are we often asked by the customer service staff what accuracy level is required? If we don’t know about these, the customer service will ask you what occasions the meter is used in, and then recommend the appropriate accuracy level to you. Why is the accuracy level a parameter that cannot be ignored when purchasing a smart meter? Let's first look at the accuracy class.

Common domestic smart meter accuracy grades are 0.2S, 0.5S, 1 and 2. Taking the 0.5S level as an example, it means that the allowable error of the meter is within ±0.5%. For every 100 kWh of electricity used, only 0.5 kWh of over-metering or under-metering is allowed at most. So the smaller the value, the higher the level of precision and the more accurate the measurement.

In addition, both 0.2S and 0.5S smart watches are equipped with auxiliary power supply, which can ensure that the data can be saved without loss in the event of a power failure and can also supply power to the clock chip.

There is another point that can be paid attention to, which is the difference between meters with and without S-level such as 0.2-level and 0.2S-level. The main difference between the two is the different requirements for light load measurement accuracy. Without S, there is no error requirement below 5%Ib (calibrated current), while the S class has an error requirement at 1%Ib, which improves the metering characteristics of the smart meter with light load. That is, the S-level electric energy meter can keep accurate measurement within the specified error in the range of 1%Ib~120%Ib.

After understanding the basic information of the accuracy level of smart meters, how should we choose? From the above, we know that the higher the precision level, the more accurate the measurement, and of course the more expensive it is. Therefore, in terms of practical benefits, when purchasing a smart meter, it is necessary to select the accuracy level according to the monthly electricity consumption. Factories and enterprises with large power consumption can choose 0.2S or 0.5S high precision. Residents can choose a lower precision level for ordinary electricity consumption, both Level 1 and Level 2. Although the error will be larger, the cost of the error is also very low because of the small electricity consumption of residents.