Duct Limit Control Senses Temperature in Dryer | Firestat

Duct Limit ControlA duct limit control is commonly used in HVAC systems to detect air temperature inside a duct. Although, these temperature controls can also be found in grain dryers. The duct limit control functions the same in the grain dryer, but rather than sensing a building air duct temperature, the limit control senses a change in air temperature inside the dryer. When the grain blocks the air flow temperature, the duct limit control senses the temperature change shutting down the system. The operator must clear the blockage and manually reset the duct limit control to resume operation.

Our duct limit control is available in two different styles, adjustable or preset temperatures (100-250F), with multiple different element lengths (5″, 7.5″ and 11″) to choose from.

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Duct High Limit Used in Grain Dryer

Our duct limit control monitors temperature inside a grain dryer by responding to air flow blockage. The duct limit control is inserted into multiple spots along the dryer to monitor the dryer’s air stream. If the TC senses the rapid increase in temperature beyond the set point it automatically shuts the system down. The manual reset makes sure that the system cannot be restarted until the blockage is cleared.

This is a cost-effective solution to a big problem.

Other Common Applications

Commonly the duct limit control is installed in air ducts to shut down HVAC equipment when air temperature exceeds a pre-set limit. These duct high temperature limits are indispensable in specialized HVAC applications and Building Automation Systems.

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