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What is the reason why the muffle furnace heats up too slowly?

Aký je dôvod, prečo muflová pec heats up too slowly?

1. The heating device is aging;

2. When the silicon carbide rod is heated, there may be a group not working;

3. The adjusted current is too small;

4. With the intelligent program meter, it is possible that the set heating time is too long.