WEBVTT

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Trace the installed measurement

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chain from sensing element to displayed
value.

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Record the relevant identifiers,
locations, ranges

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and configuration against the approved
schedule.

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A display tag does not prove which sensor
feeds it.

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Installation evidence provides the
configuration

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baseline for later assembled-loop checks;

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it does not by itself establish accuracy
throughout operation.

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A calibration sticker is a starting point
for locating the record.

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Review whether the certificate identifies
the correct instrument

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and whether its range, points, method,

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results and status support the intended
check.

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Consider uncertainty and the applicable
decision rule where relevant.

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A current date on an unrelated instrument
certificate

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cannot justify using the installed device.

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For this fictional arithmetic exercise,

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the reference is 40.0 °C and the
indication is 40.4 °C.

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Indication minus reference gives +0.4 °C.

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With a teaching limit of plus or minus
0.5,

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the magnitude is within that simple limit.

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This is not a full calibration acceptance
decision;

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uncertainty, method and the approved
decision rule still matter.

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If an instrument is outside its required
calibration status,

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identify which checks relied on it and
assess their validity.

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Do not simply obtain a new certificate

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and assume earlier readings remain valid.

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The investigation may require additional
evidence

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or repeated checks under an approved
approach.

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Record the basis for the decision

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and retain the original observations.