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PUBLISHED: Navigating A2LA P102 (T4): Your Essential Guide to In-House Calibrations for Accredited Labs

pH meters require calibration when used to establish metrological traceability of results or where their measurements affect the validity of reported results.
pH meters may require calibration and can be calibrated by the lab themselves

Published! What started as a workshop at A2LA AnnCon25 has become a published Guide G149: Guidance for Application of A2LA P102 In-House Calibrations.

(A2LA P102 is the Policy on Metrological Traceability.)



In-house calibrations are for "conformity assessment bodies (CAB) when they are calibrating their own Measurement & Test Equipment (M&TE) that are used in support of accreditation activities and used for parameters which are not on the CAB’s accreditation scope."

** For testing labs, calibrations are typically NOT on your accreditation scope; so, all calibrations performed in support of accredited activities would be "In-House Calibrations"

** For calibration labs, calibrations are on your scope of accreditation, but whatever parameters are NOT on your accreditation scope for which you perform your own calibrations in support of accredited activities would be "In-House Calibrations"


Metrological traceability pyramid from your measuring & testing equipment (M&TE) to SI Units through a documented unbroken chain of calibrations, each with measurement uncertainty
Whether externally calibrated or in-house calibrated, the purpose is to uphold metrological traceability to SI Units

Are you an A2LA accredited lab who calibrates your own measuring and testing equipment (or not sure if you do or should be)? Are you struggling with what seem like 'extra' requirements from accreditation bodies for in-house calibrations? The good news is that the requirements are already in ISO/IEC 17025! 

Also, all GACI-MRA (formerly ILAC-MRA) accreditation bodies have policies on metrological traceability and for In-House calibrations. Go to your accreditation body's website for the relevant copy.



This guidance document is an easy-to-follow guide on understanding:

  • How to tell what equipment needs calibration,

  • Ways to prove metrological traceability: Externally calibrated or calibrate your own,

  • Alignment between A2LA P102 (T4) In-house calibration requirements & ISO/IEC 17025 clauses,

  • Q&A and examples of in-house calibrated equipment.


Calipers, micrometers, and other hand tools may require calibration
Dimensional tools can be in-house calibrated

Are you not sure if you're calibrating or verifying equipment?

Are you not sure if you're meeting ISO/IEC 17025 & accreditation body requirements?

SOLUTIONS:



 
 
 

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