On a P&ID, what does TIC indicate?

• A. Temperature Indicator and Controller
• B. Temperature Isolation and Control
• C. Thermal Indicator and Controller
• D. Temperature Instrument and Calibration

Answer: (A)

TIC is a Temperature Indicating Controller—a device that both shows the current temperature and provides a control action to adjust the process. In a closed-loop setup, the sensor feeds the TIC with the measured temperature, the TIC compares it to a setpoint, and it outputs a control signal to an actuator (like a valve, heater, or cooler) to drive the temperature toward the desired value. This is why TIC represents both measurement (indication) and automatic control in one instrument tag. The other options either imply only indication, or involve concepts not represented by this tag.