Which abbreviation is used for Temperature Sensor/Primary Element?

• A. ISA
• B. TE
• C. TIC
• D. ISO

Answer: (B)

The Temperature Element tag TE is used to identify the sensing portion of a temperature measurement. This primary element is the actual sensor (like a thermocouple or RTD) that directly responds to temperature and produces a signal that downstream equipment can process. TE is the designation for that sensing element, distinguishing it from other parts of the system such as transmitters, indicators, or controllers.

Other options refer to organizations or to different devices in the loop (for example, ISA and ISO are standardization bodies; TIC might denote a temperature-indicating controller, which is a later-stage instrument). They don’t denote the basic sensing element itself, which is why TE is the correct choice.