How often you need to change the desiccant will depend on the type of desiccant breather you are using:
Drum Desiccant Breathers: This depends on several factors, such as how often the drum is emptied, the rate at which the contents of the drum are emptied, the environmental conditions (temperature, relative humidity, and pressure) and changes in those conditions, exposure to sunlight, and the contents of the drum.
Tank Desiccant Breathers: This will depend on the size of the desiccant breather you need to fit the transformer, as determined by our Selection Guide. To increase the time between desiccant change-outs, you can always select a unit that is larger than that which is called for in the selection guide.
Transformer Desiccant Breathers: This depends on several factors, such as how often the drum is emptied, the rate at which the contents of the drum are emptied, the environmental conditions (temperature, relative humidity, and pressure) and changes in those conditions, exposure to sunlight, and the contents of the tank. The breathers can easily be refilled without any special tools.