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Calibration of thermometers

Discussion in 'ISO 17025 - Calibration and Test Laboratories' started by Sergio Rufini, Aug 9, 2017.

  1. Sergio Rufini

    Sergio Rufini New Member

    Aug 9, 2017
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    I have a doubt about the calibration of the single thermometers.

    In our labs we have a measurement system for test composed of:

    Agilent Datalogger 34970A
    Agilent Multiplexer 34901A
    4wires Platinum Thermometers PT1000 (accuracy Class B IEC 60751)

    According to Agilent Manual the Datalogger and Multiplexer shall be calibrated once a year.

    But what about the thermometers? They have an accuracy that is measured from the manufacturer, but does this accuracy expires?
    Is there a standard that explain what device have to be calibrated and how?
    A system level calibration is not a real option for us, since the thermometer are usually changed and substituted for every test.


  2. Andy Nichols

    Andy Nichols Moderator Staff Member

    Jul 30, 2015
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    In the "Rust Belt"
    Manufacturers often publish this. It's a guess. They don't know and can't tell how often the device is used so it's their fall-back position. In reality, you should build a history of "as found" conditions for calibration to help define when the thing should be recalled - based on use.

    You might find something here: http://www.gidep.org/

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