What gives a visual indication of the airflow needed to maintain the target pressure in the furnace chamber or duct?
A. Instrument control systems
B. Pressure gauge
C. Interlock control system
D. Draft control system
A. Incorrect. Instrument control systems use sensors and logic control to shut off the supply of furnace fuel or process feed and to shut down the furnace under certain conditions.
B. Correct. A pressure gauge in the furnace chamber or duct gives a visual indication of the airflow needed to maintain the target pressure.
C. Incorrect. Interlock control systems are safety devices used to protect the furnace from developing dangerous operating conditions.
D. Incorrect. Draft control systems regulate and stabilize the pressure in the combustion chamber.
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