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How to choice EM strips with high quality
There are two kinds of EM strips in the EAS market at present: cobalt strips and iron strips. They are made of metal cobalt and pure iron. According to the function of whether they could be magnetized or be degaussed, there are composite strips and permanent strips. Generally the composite strips are used for open-shelf books and the permanent strips are always used in reading room because the books cannot be lent outside. Each iron strip is half the price of cobalt one but brought many trouble to libraries, such as:
● It alarms when the new strips are passing by the detecting channels but it doesn’t alarm after setting them inside the books.
● Sometimes it alarms and sometimes it doesn’t alarms.
● The system doesn’t alarm when the books with strips are passing by the detecting channels.
● The EM strips alarmed in a short while after being set inside the books but they stop alarm later.
Why do these problems happen?
Because of the bad quality EM strips, especially the iron strips. Better cobalt strips should be the wise choice for libraries to avoid the problems.
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