Thermowell
A protective sheath that the temperature element inserts into. Tagged TW separately from the TE that lives inside it. Same physical location, two distinct items on the instrument index.
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How it’s drawn.
A small sheath or pocket drawn at the pipe or vessel wall, into which the temperature element inserts. It is tagged separately, often TW, from the TE that lives inside it, so one nozzle can show two tags at the same place. The thermowell protects the element and lets it be removed without breaching the process.
Typical usage.
Every process-installed temperature element except surface-mount applications uses a thermowell. The TE, TW pair shows up as two tags at one nozzle. Extraction tools that conflate the two tags lose half the temperature record.
Telling it apart.
- The thermowell is the pocket. The temperature element is what sits inside it. They are two items at one location.
- Seeing one tag at a temperature point can miss the pair. The well and the element are distinct entries.
- The thermowell itself does no sensing. It is the protective sheath around the element.