Answer / carl_ellis

- P&ID: tag name/number for the instrument in question,
but not the location

- Loop diagram shows tag name/number, has a location
description (field, panel, I/O rack, control room) and
wiring terminals ID (are wires 1578 and 1579 connected to
the instrument in question?)

- ISA's instrument spec sheet has a section for calibration
with input/output, but more importantly, the following
section has Component Identification by manufacturer and
model number. The serial number isn't there because this
document defines the functionality, not a specific device.

- The company's "Instrument Specification Data Form" should
have a field for a location and instrument serial number

- Calibration data sheet should have a field
for "Location", tag and serial number.

- There should be a stainless tag on a field instrument

- The handheld communicator displays the tag name when
connected. The instrument's tag name should match the work
order's tag.

- The local "Calibration status label" on or inside the
instrument always has a tag ID.

Carl Ellis
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