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Complete instrument lists help a contractor to accurately bid and procure instruments. Instrument lists can take the form of a spreadsheet or database for easy sorting by various criteria (e.g., flow meters, pressure transmitters, etc.). An instrument list can also be used as a checklist by the design team to ensure that all devices have been accounted for. At a minimum, an instrument list should include the following:

• Tag number as listed in the P&ID,

• Description of instrument,

• Technical specification section,

• Calibrated-range setting,

TABLE 3.2 A sample list of monitored variables.

• Setpoints for discrete devices,

• Location of the P&ID,

• Physical location drawing number, and

• Remarks section for any additional information.