What are three electro magnetic counting devices?

Electromagnetic counting device refers to the use of electromagnetic principle for counting equipment, according to different application scenarios and design, there are mainly the following types:

Mechanical electromagnetic counter: This type of counter is the use of electric pulse excitation coil to attract the armature, and then drive the counting mechanism to count. They usually come in different sizes of 3 to 7 bits (decimal) and are suitable for high-speed measurements, some of which can reach around 60 times per second. There are two ways to clear zero: manual and electromagnetic, which have a long life, but there may be a case of miscounting. They are widely used in petroleum, chemical, textile, machinery, mining, national defense, agriculture, food, printing and other industries.

Electronic counter: An electronic counter is an electronic device that uses electronic technology to count. Although the specific details are not explicitly mentioned in the search results, electronic counters will often be more advanced than mechanical counters and may include integrated circuits and other electronic components for accurate counting and data processing.

Double pointer electromagnetic counting device: This is a counting device specially used to record the number of lightning arrester movements, which belongs to a discharge counter. It uses electromagnetic principles to record the discharge events of the arrester, and is commonly used in high-voltage electrical equipment.

In summary, electromagnetic counting devices mainly include mechanical electromagnetic counters, electronic counters and dual-pointer electromagnetic counting devices dedicated to specific application fields. These devices all work using electromagnetic principles, but differ in their design and use.