FS-Curtis DLM Series

DLM is a line of heatless low-flow desiccant dryers spanning roughly 13 to 40 in rated flow, along with supporting accessories such as pressure dew point sensor kits. They are sized for point-of-use and small-system drying rather than whole-plant duty.

A heatless dryer regenerates the offline desiccant tower using a portion of the dried compressed air, with no heater involved. It is the simplest and lowest capital cost desiccant design, at the cost of consuming compressed air for regeneration.

For a specific piece of equipment or a branch of the system that needs much drier air than the main refrigerated dryer delivers — instrument air, a particular process, or a line running through a cold space. Point-of-use drying is often cheaper than upgrading the whole system.

A meaningful percentage of throughput is used for regeneration. That purge must be added to the compressor's load when sizing the system. Confirm the purge rate for the specific model so the compressor is not undersized once the dryer is fitted.

It measures the actual dew point of the air leaving the dryer, so desiccant condition is monitored directly rather than guessed. Without it, the first sign of spent media is often moisture appearing downstream in the process.

A coalescing filter upstream to protect the desiccant from compressor oil, and a particulate filter downstream to catch desiccant fines. On a small dryer these filters are inexpensive relative to the media they protect. A dryer sized right but filtered wrong still shortens desiccant life.

Size on the actual flow required at the point of use, including the regeneration purge, at your working pressure. Point-of-use dryers are commonly undersized because the purge consumption is overlooked in the calculation. Sizing on your actual worst case rather than a typical case is what prevents the equipment being outgrown early.