Bossman Instruments Technology


Ultimate in Filtration & Purification Technology                               An ISO 9001:2000 Certified Company



Desiccant Air Dryers

Compact Heatless air Dryer
Heatless Desiccant air Dryer

Internal Heat Compressed air Dryer

Blower Heat Reactivated air Dryer

Refrigerated Air Dryer

Refrigerated air Dryer
High Pressure Refrigerated air Dryer

Filters & Filter Cartridges

Compressed air Micro Filter
Coaleaser Filter
Dust Filter
Hydraulic Filter
Oil Filter
Water Filter
Steam Filter
BAG Filter
Panel Filter
Automobile Filter
Water Strainer
Air Treatment Accessories
Electronic Autodrain Valve
No loss energy save Drain Valve
Moisture Seperator
Air Cooled After Cooler
Water Cooled After Cooler
Air Receiver

Measuring & Control instruments

Temperature Controller
Moisture & Dew point  meters
Temperature & Pressure Transmitter
Temperature & Pressure Sensors

Replacement Filter Elements & Bags Filters

Air Filter Elements & Cartridges
Filter Bags



       Internal Heat Compressed air Dryer


Internal Heat Reactivated Dryers

              To get compressed air of very low Dew point of (-)60oC or (-)800 C then heat reactivated dryers are used. In our range of Internal Heat Re-activated Dryers design, the desiccant is regenerated at higher temperature with small quantity of dry air purge. Due to purging with dry air and thermal regeneration, residual moisture loading on desiccant becomes low and this gives very low dew point.

The drying unit has 2-vessels filled with activated alumina or molecular sieves desiccant. One vessel remains in drying cycle for 4 hours, while other vessel regenerate at atmospheric pressure. Around 3% flow of dryer capacity is used as purge for regeneration.

Electrical heaters are provided in a central finned stainless steel pipe in both drying vessels. Heating cycle is for 2 hours and in this time hot purge air increases desiccant temperature to around 100oC. At this temperature regeneration is complete. Dew point achieved is around (-)40oC. Whenever lower dew point is required, air purging rate is slightly increased to 5% for (-)60oC and to 7.5% for (-)80oC dew point.

          A Pre-filter with automatic drain valve is used to remove physical moisture from compressed air before entering air dryer. A micronic filter is also used in the dryer outlet to arrest any desiccant dust particles, up to 1 micron size. It provides clean & dry compressed air.


Salient Features

  • A fully Automatic unit requiring no attention of the operator. Heaters switch on/ off and all valves operate automatically.
  • Pressure is equalized to line pressure before changeover of drying vessels. This prevents pressure and flow surge, and, desiccant dusting

  • Low purge air requirement in comparison to heat less type dryer.
  • Desiccant life is around 5 years.
  • Internal heaters provide maximum heat transfer efficiency resulting in lower power requirement.
  • Counter current heated dry purge air provides maximum removal of moisture with minimum gas purge loss.
  • Heaters are not in physical contact with the desiccant.
  • Standard units are designed to deliver dry gas / air of (-)400C dew point. By using more purge airflow, and using molecular sieves, dew point of (-) 800C can be achieved.
Air capacity   : 5 to 5000 NM3/ Hr.
Dew point      : (-)40oC to (-)80oC.
Operating pressure : 2 to 50 kg/ cm2g.
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