Which instrument is used to monitor and adjust draft pressure?

• A. Pressure transmitter
• B. Temperature gauge
• C. Voice alarm
• D. Light indicator

Answer: (A)

Monitoring and controlling draft pressure relies on an instrument that measures the pressure and sends that information to the control system so automatic adjustments can happen. A pressure transmitter does this: it senses the actual draft pressure and converts the measurement into an electrical signal that the control system uses to regulate dampers or fan speed to keep the draft at the desired level. This creates a feedback loop where the system continuously measures, compares to the setpoint, and adjusts.

A temperature gauge only reads temperature, not pressure. A voice alarm provides alerts but doesn’t measure or control. A light indicator shows status but doesn’t feed a control signal to adjust the draft.