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The difference between Class B and N pole and S pole of sterilizer

N-type pressure steam sterilizer: without a vacuum pump, relying on correct extrusion and exhaust, in principle, it can only sterilize bare physical equipment, and cannot be used for sterilization of medical equipment with holes and cavities. Type 5 and Type 6 indicators can be used for detection. Sterilized items cannot be transported or stored and should be used immediately.
Type B pressure steam sterilizer: It can sterilize packaged solid, perforated, cavity equipment and accessories, but must pass the PCD test.
Type 5 and 6 indicators, or batch PCD, can be used in sterilization packs.
S-type pressure steam sterilizer: between N-type and B-type.