Working principle of mechanical analog meters Traditional analog meters are mechanical devices found near the service entrance. The service line of the utility enters the building. The mechanical device is either accessed from the elevated line that enters the weather station and descends through the conduit to the meter, or from the underground service line. Entered. The meter is usually housed in a glass enclosure with a metal plate inside, which rotates as the circuits in the building draw current from the service line. If you observe the disc, you can see that it moves slower when power consumption is low (for example, at night), and moves faster during peak usage hours. Mechanical instruments use two conductor coils that generate a magnetic field. A coil is affected by the current flowing through the conductor. The other coil is affected by the voltage across the conductor. Together, the magnetic field generated by the coil turns a thin aluminum disk at a controlled speed. (Aluminum is not magnetic, but in this case moves by a principle called eddy current). The disc turns a series of gears to move the five dials and records the amount of electricity in kilowatt hours. This mechanism is called an indicator. The power consumption is manually read by the utility service personnel who have to visit the home to read the numbers on the dial. Mechanical meters cannot be read remotely. Calculate the electricity consumption of the building by subtracting the figures from the previous month from the readings of this month. Savvy consumers can learn to read these dials to understand their power consumption and verify that utility charges are accurate. 3. How to read a mechanical meter To record your electricity consumption, you must have a starting point and an ending point. If you want to know how much power is consumed in a month, take an initial reading on the first day of the month, and then take a second reading at the end of the last day of the month. The difference between the two readings will tell you how many kWh were used in the month. To take a reading, start with the number on the dial on the far left side of the meter and read to the right. Write each number from left to right. Suppose your initial reading (at the beginning of the month) is shown as 01050. The second reading (at the end of the month) is shown as 02050. Subtract the lower reading from the higher reading: 02050-01050 = 1000. This means that you have used 1,000 kWh in a month. The important thing to remember is that if the dial is between the numbers, the reading should be recorded as a smaller number. For example, if the dial is between 1 and 2, the reading will be recorded as 1 until it passes 2 on the dial. Also note that when you look at the five dials, the first, third, and fifth dial numbers run clockwise, while the second and fourth dials run counterclockwise. This is normal and there is no need to worry. 4. How digital meters work There are several types of digital meters. The older model contains a similar mechanical system that measures the current from the service wire to the building, but it also has an analog-to-digital converter (ADC) that converts the measurement results to digital signals. A new type of digital electricity meter has an AC (alternating current) sensor for detecting the voltage and amperage in the input wire. This type of digital meter is more suitable for picking up all the power in the circuit, making it more accurate than the mechanical or ADC type. The digital electric meter has a digital display instead of a dial pad. You or a service person can manually read the electronic display on the surface of the electric meter, or you can send the signal to a utility company through a high-frequency signal, which is sent again. Back to the utility company. The company is on the wire. In some types of digital meters, passing service vehicles with appropriate equipment can "read" the meter through the radio frequency signal emitted by the meter. If a home or business is equipped with solar panels or wind turbines and these turbines retransmit electrical energy to the grid, the digital meter will record the net usage. The meter tracks the direction of energy flow, which can be read on the meter surface in a "transmitted" or "received" way. Zhejiang Zhaofeng Electric Meter Co., Ltd. is a manufacturer and supplier of single-phase, three-phase electric meters, electric energy meters and din rail meter . We have established a mature and professional team in the design, production and sales of electric meters. Welcome to consult and order: https://www.yhddb.com/product/din-rail-kwh-meter/