Only one set of tag calibration settings is allowed per tag. Therefore you should use the tag calibration settings to define tag-specific data such as alarm / trip points, input and output ranges, and units of measure. Other calibration values that are not tag-specific such as number of calibration points, tolerance, and so forth, can be stored in the calibration profile settings.
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Start the Calibration module.
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Select Actions > Tag Settings
.
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On the Enter Tag Number dialog, type the required tag number or select Find to search instrument tags.
If you selected multiple tag numbers, select Actions > Tag List or 
and then select a tag number to define the settings for that instrument.
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Select Actions > Select Profile
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Define the calibration settings values for the tags as required .
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If you are defining calibration settings for a tag number associated with process data, you can copy existing process data minimum and maximum range values. For details, see Copy Existing Process Data.
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If you are using the Standard Settings calibration sheet, the Measuring Point parameter is available for single point calibrations only.
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If you are using the Standard Settings calibration sheet, the fields in the Set values group box are available only if under Calibration type, you selected Switch set point.
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Select Save
to save the settings.