TRANSEC CL3  - is a three cylinder unit designed for Transformers with an oil volume greater than 10,000 litres.  Time to saturation will vary greatly  and depend on the load duty and hence temperature profile, as well as ambient conditions.  Average time to saturation on a 'wet' transformer will be in the region of 9 to 18 months.

TRANSEC CL1  -  is a single cylinder unit designed for Transformers with an oil volume less than 10,000 litres.  The CL1 is an economic way of  drying a smaller transformer, or to maintain  a larger transformer that has already been dried, in a dry condition.