Electric meter

Scrap Wiki

Electric meters are devices used to measure and record electricity usage. These devices can be based on different technologies, including traditional mechanical meters (analog) and modern electronic meters (digital). Both types have different structures and components.
Mechanical meters, also known as "rotating disk meters," typically consist of:
* An aluminum measuring disk that rotates under the influence of an electric current. The speed of the disk is proportional to the current flowing through it.
* Gears and counters connected to the rotating disk to record electricity usage.
* An electromagnetic field, usually with a copper coil, to stabilize the rotation speed and ensure measurement accuracy.
* An outer casing, usually made of metal or plastic, to protect the internal components.
Electronic meters have a more complex structure, including:
* Electronic measurement components: Use electronic circuits to measure current and voltage, and calculate power and energy consumption.
* Microprocessor: Processes measurement data and controls display and communication functions.
* Display: Shows electricity usage and other information, possibly using LCD or LED technology.
* Communication interface: Allows remote reading and monitoring of meter data, possibly including wireless or wired connections.
* Power supply: Provides power to electronic components.
* Outer casing: Typically made of plastic, to protect internal electronic components.
Below is a common appearance of electronic meters:

Below is a common appearance of mechanical meters, with many internal components made of brass, metal, and aluminum:

Common Classification

Electric meters are classified into two main categories: mechanical meters (analog) and electronic meters (digital). They can also be categorized based on their outer casing material (e.g., shell-less, plastic casing, glass casing).

Common Sources

The recycling of discarded electric meters typically involves the following channels:
1. Public utility companies: Many power companies regularly replace old meters, including upgrades to smart meters, resulting in a large number of discarded meters. These companies usually have their own recycling plans or collaborate with professional recycling companies to handle these discarded meters.
2. Waste recycling centers: Some waste recycling centers or waste processing plants accept discarded electric meters and dismantle them to recover metals and other valuable materials. Residents or businesses can directly deliver discarded meters to these recycling centers.
3. Professional electronic waste recycling companies: These companies specialize in recycling electronic products, including discarded electric meters. They usually possess professional equipment and qualifications to safely dismantle meters and recover valuable materials.
4. Building demolition or renovation sites: During building demolition or renovation, a large number of electric meters are discarded, often with similar specifications and quality, making them suitable for recycling and processing.
5. Commercial and industrial sites: Some commercial or industrial facilities produce discarded electric meters when upgrading or maintaining their electrical infrastructure. These facilities often collaborate with waste recycling companies to ensure proper handling of these discarded materials.

Value Points

Valuable materials found in discarded electric meters include:
* Metals: Copper (enamel-coated wires and copper wires), aluminum (used in mechanical meters' rotating disks), and steel (used in outer casings and structural components).
* Plastics: Outer casings and internal insulation components may be made of various plastics, which can be recycled and reused.
* Electronic components: Electronic meters' circuit boards contain various components, including low-grade circuit boards that may contain silver, gold, palladium, and other precious metals, as well as copper and other recyclable metals.
Below is a picture of a mechanical meter's aluminum measuring disk (left) and a large number of brass components inside a mechanical meter (right):

Mechanical Meter's Aluminum Measuring Disk

Large Number of Brass Components Inside a Mechanical Meter

Processing Methods

As a miscellaneous item, electric meters need to be dismantled before becoming colored metal scrap. The dismantling process mainly involves manual dismantling and mechanical dismantling. Manual dismantling involves opening the outer casing, removing valuable metal components and electronic components, and sorting them. Mechanical dismantling involves breaking the meter into pieces using crushing machinery, then separating the outer casing (stainless steel, aluminum) and internal structural components, circuit boards, etc.

Detection Methods

Electric meter scrap is typically detected through trial dismantling and sorting.

Matching Direction

Electric meters are primarily dismantled manually, making them suitable for dismantling in areas with low labor costs. The dismantled materials include copper and circuit boards, which are in high demand in countries like Thailand and Malaysia. Therefore, electric meter scrap is suitable for sale to dismantling factories in Thailand and Malaysia.

Special Attention

When trading electric meter scrap, it's essential to pay attention to the uniformity of the product photos and actual goods, as well as the consistency of the declared shipping location and actual shipping location. This is because electric meter scrap has a high degree of variability, and prices are heavily dependent on factors like photos, origin, and other information.

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