Beatrice Lang
There are several ways in which electric companies can read meters. The standard meter is a clock-like device that is driven by the electricity moving through it. The dials on the face of the meter record the number of revolutions made by a set of small gears inside the meter. These dials can be read by the electric company to determine energy usage. This can be done visually, or with the help of binoculars. Some meters can also communicate wirelessly, and are known as AMR meters. AMR meters can be read with handheld computers, or automatically with reading devices installed in vehicles. Another type of meter is the smart meter, which sends usage information back to the utility company via radio signals or cellular communication.
| Characteristics | Values |
|---|---|
| Reading method | Electric meters can be read manually by the user or the utility company. Utility companies can also use high-frequency signals, or radio waves to collect readings from a distance. |
| Meter type | Analog meters, smart meters, digital meters, and AMR meters. |
| Reading frequency | Utility workers may visit homes to take readings from analog meters. Smart meters can communicate readings directly to the utility company and may not require a worker visit. |
| Billing impact | Analog meters only show the difference in readings and do not provide insights into usage patterns. Smart meters allow utility companies to see usage patterns and change the way they charge for electricity. |
| Solar power | Smart meters can help solar installers understand usage patterns and design a suitable system. |
| Meter ownership | The utility company owns the meter and is responsible for its installation, maintenance, and reading. |
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What You'll Learn
Analog meters are read visually
Analog meters are more challenging to read than digital meters. Analog meters have multiple rotating dials with numbers on them, and each dial represents a digit. The dials move in opposite directions, with some hands turning right and some turning left.
When reading an analog meter, you need to write down the number that the hand has passed. If a hand is directly on a number, you may be unsure whether to write that number or the next lower number. In this case, if the hand on the right has passed 0, write down the number to which the hand on the left is pointing.
To read an analog meter, start with the dial on the far left and work your way to the right. Note down the numbers from left to right to get your electric consumption reading.
Analog meters are usually found on the exterior of a home or in a utility room.
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Smart meters use radio signals or cellular communication
Smart meters are advanced utilities that provide real-time data, enabling companies to make informed decisions. They are an integral part of the smart grid, facilitating efficient resource distribution and utilization while promoting sustainability. Unlike traditional meters, smart meters do not rely on a person to read the meter and can send data directly to the utility company. This is done through radio signals or cellular communication.
Radio frequency communication is a popular choice for smart metering systems. It involves the transmission and reception of data wirelessly through radio waves. Radio communication operates within a specific range of frequencies allocated for various purposes, including telecommunications, broadcasting, and wireless networking. The radio frequency communication at which smart meters operate varies depending on regional regulations and technological specifications. In many regions, smart meters utilize radio frequencies between 900 MHz and 2.4 GHz. The 2.4 GHz band is commonly used in urban environments due to its high data transfer rates, while the 900 MHz band is better suited for rural areas because of its improved range and penetration.
Smart meters can also communicate via cellular networks, particularly LTE-M and NB-IoT. These networks provide excellent indoor coverage and can penetrate dense building materials. Cellular IoT solutions enable smart meters to use TCP/IP or UDP/IP for data transmission to the cloud. Additionally, smart meters that use cellular technology can benefit from power-saving features such as Power Saving Mode (PSM) and Discontinuous Reception (DRX), extending their battery life.
The choice of communication technology in smart metering depends on various factors, including deployment requirements, regulatory considerations, infrastructure availability, and cost-effectiveness. While radio frequency communication is widely used, cellular networks offer advantages in terms of coverage, data transfer rates, and power efficiency, making them a viable alternative for smart meter communication.
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AMR meters can communicate wirelessly
AMR, or Automatic Meter Reading, is a system that enables the remote collection of energy usage data from utility meters. AMR meters can communicate wirelessly, leveraging various technologies such as radio frequency (RF), cellular networks, and telephone modems.
Wireless communication in AMR meters offers several benefits. Firstly, it eliminates the need for manual meter reading, reducing operational costs for utility companies. It also provides real-time data, allowing for more accurate and efficient meter reading. Additionally, wireless AMR meters enable utility companies and customers to better control and manage energy usage.
AMR meters use radio waves to communicate with the meters. The AMR antenna emits radio waves in a specific frequency range, which are received by the utility meters. These meters are equipped with a small radio transmitter that responds by transmitting their data back to the antenna. This two-way communication system allows the meter and the reading device to both send and receive radio signals.
While AMR meters can communicate wirelessly, they may also use a one-way "bubble-up" or continuous broadcast type system, where the meter transmits data every few seconds, and the reading device is a receiver only. This system still provides the benefit of remote data collection, but without the need for two-way communication.
AMR technology is evolving, and modern signal collection and processing technologies now allow for more frequent wireless data collection from AMR meters, offering increased interoperability with other advanced meters.
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Retro-fitting makes older meters wireless
Electric companies employ meter readers who can take readings from analog meters visually, often from 50 feet away, without any assistance. They can also use tools like binoculars or monoculars to read meters from greater distances or from convenient spots like the car or a neighbour's house. However, retro-fitting is a process that puts a new module into older meters to make them wireless, allowing companies to save money by extending the life of their meters.
Retro-fitting older meters with wireless technology offers several benefits. Firstly, it helps electric companies save costs by extending the lifespan of their meters. Instead of purchasing new meters, companies can simply install wireless modules into their existing meters. This not only reduces equipment costs but also avoids the expense of hiring workers to install new meters, minimising disruption to staff and occupants.
Wireless meters also reduce installation costs by eliminating the need for wiring interconnections and additional installation equipment. They are easy to install, requiring no screwing or external fixings. The compact and lightweight design of wireless sensors makes them ideal for retrofitting into older buildings, even those with challenging designs that cannot accommodate bulky equipment. The adhesive backing of wireless sensors allows for discreet installation on walls, desks, or ceilings.
Additionally, wireless meters facilitate remote reading, enabling electric companies to collect data without physically accessing the meter. This improves efficiency and reduces the time and resources required for manual meter reading. Wireless solutions, such as Low Power Wide Area Networks (LPWANs), conserve power by using low frequencies, allowing signals to travel farther while consuming less energy. Wireless M-Bus, a widely available standard in Europe, offers interoperability and increased compatibility through OMS certification.
In summary, retro-fitting older meters with wireless technology is a cost-effective strategy for electric companies, streamlining installation, maintenance, and data collection processes while extending the lifespan of their meters.
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Reading dials from right to left
Reading an electric meter is important for understanding your energy consumption and ensuring accurate billing.
Electric meters can be digital or have dials. The dials on your meter turn in different directions, but the pointer always moves from 0 to 9 (then starts again at 0).
When reading dials from right to left, start by reading the numerical scale for the pointer on the furthest dial to the right. Then, estimate the additional fraction between the number and the pointer. For example, if the pointer is between two numbers, write down the lower number – except when it sits between 9 and 0. If the pointer sits between 9 and 0, write down '9' and reduce the number on the previous dial by one.
For digital electric meters, watch the display. The “Time of Use” Digital display will cycle through various displays, ending with “888888” to indicate the start of a new cycle. Start recording necessary displays as they flash. Note that digital meters without “Time of Use” programming will not display identifiers, and the digital read will be the Kwh total.
It is important to note that some newer electric meters use digital displays instead of dials.
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Frequently asked questions
Utility workers are sent out to take the reading. They then calculate energy usage by finding the difference between the current reading and the previous reading.
Smart meters communicate electricity usage directly with the utility company, either via a cellular signal or radio waves.
Read and write down the numbers shown on the dials from right to left. When the pointer is on a number, look at the dial to the right. If it has passed zero, use the next higher number. If it hasn't passed zero, use the lower number.
This depends on the type of meter you have. If you have an older meter, a utility worker may come to your home every month to take the current meter reading.
Older analog meters may run slow, so your usage may not have actually increased.
