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Welcome to Part 2 of ASI’s tutorials on industrial flotation dryers. These dryers are used in the converting and continuous process industries. In this video, Rodger, our head of service, will go through the gear side of the dryer and discuss the plenums, burners, gas trains, and various dress out components used to monitor and control the operation of an industrial dryer.


The plenum is the heat source of the dryer and includes the burner, gas train, and supply fan. On this particular dyer, the gas trains will be remotely located, but typically they are located on the plenum. The plenum includes the following features that are used to safely operate our dryers:

  • exhaust fan pressure switch: this is the number one safety feature of the dryer and is what ensures that the exhaust fan is operating properly and drawing air away from the dryer and exhausting it either to the atmosphere or to an RTO (regenerative thermal oxidizer used to handle solvent emissions and comply with emission regulations) 

  • flame safeguard: this measures the strength of the flame signal and monitors the fuel burning equipment to ensure safe operation

  • high temperature limit switch: this switch makes sure the supply fan does not get too hot and is required by NFP 86 (the codes, standards, and recommended practices designed to minimize fires and explosion hazards while operating ovens and furnaces used for commercial and industrial processing of materials)

  • low temperature limit switch: to indicate if the system is getting up to and maintaining the correct temperature range.


This video goes over several features of the gas train, including the:

  • manual locking shut off valve for maintenance purposes

  • two blocking valves

  • vent valve regulator

  • low gas and high gas pressure switches.

Finally, this video discusses other features of the dryer:

  • pressure transmitters with backup pressure gauge to measure the supply air pressure and to ensure enclosure is maintained at a negative pressure, which ensures process air is not escaping into the room

  • thermocouples and/or RTDs to read and control the temperature (the air temperature and supply fan pressure are used to calculate the nozzle velocity, one of the set points used to control the drying)

  • a humidity sensor (per the customer’s request, not typically included)

  • various ports on the dryer for temperature control.


If you are interested in a quote or in finding out more about our products and services, please visit our website at www.asitti.com or call us at 920.468.5477.

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