In process plant tagging, what does the prefix indicate for a tag such as TI-101 or FC-202?

In process plant tagging, what does the prefix indicate for a tag such as TI-101 or FC-202?

• A. The plant area code
• B. The device type or function
• C. The calibration method
• D. The manufacturer

Answer: (B)

The prefix shows the device type or function of the instrument. In process tagging, prefixes are used so anyone can recognize at a glance what role the device plays in the system, which helps with operation, troubleshooting, and maintenance. A prefix like TI indicates a temperature-related device, such as a temperature indicator or transmitter, so TI-101 points to a temperature instrument in that loop. A prefix like FC signals a flow control device, meaning a flow controller that modulates a valve to control flow, so FC-202 identifies that kind of instrument. The numbers that follow are typically just unique identifiers for location or installation sequence, not additional meaning about the device type. Other details like plant area, calibration method, or manufacturer aren’t conveyed by the prefix itself in this scheme.

The prefix shows the device type or function of the instrument. In process tagging, prefixes are used so anyone can recognize at a glance what role the device plays in the system, which helps with operation, troubleshooting, and maintenance. A prefix like TI indicates a temperature-related device, such as a temperature indicator or transmitter, so TI-101 points to a temperature instrument in that loop. A prefix like FC signals a flow control device, meaning a flow controller that modulates a valve to control flow, so FC-202 identifies that kind of instrument. The numbers that follow are typically just unique identifiers for location or installation sequence, not additional meaning about the device type. Other details like plant area, calibration method, or manufacturer aren’t conveyed by the prefix itself in this scheme.