Explain the difference between a transmitter and a sensor in instrumentation and give an example.

Explain the difference between a transmitter and a sensor in instrumentation and give an example.

• A. Sensor detects physical quantity; transmitter converts to standardized output signal (e.g., 4-20 mA) suitable for control systems; example: RTD with a 4-20 mA transmitter.
• B. Transmitter detects physical quantity; sensor converts to standardized output.
• C. Sensor outputs digital only; transmitter outputs analog.
• D. They are the same device.

Answer: (A)