Please refer to this BRC clause about calibration.
Calibration and control of measuring and monitoring devices
Statement of Intent
The site shall be able to demonstrate that measuring equipment is sufficiently accurate and reliable to provide confidence in measurement results.
The site shall identify and control measuring equipment used to monitor critical control points, product safety and legality. This shall include as a minimum:
- a documented list of equipment and its location
- an identification code and calibration due date
- prevention from adjustment by unauthorised staff
- protection from damage, deterioration or misuse.
All identified measuring devices, including new equipment, shall be checked and where necessary adjusted:
- at a predetermined frequency, based on risk assessment
- to a defined method traceable to a recognised national or international standard where possible.
Results shall be documented. Equipment shall be readable and be of a suitable accuracy for the measurements it is required to perform.
Reference measuring equipment shall be calibrated and traceable to a recognised national or international standard and records maintained. The uncertainty of calibration shall be considered when equipment is used to assess critical limits.
Procedures shall be in place to record actions to be taken when the prescribed measuring devices are found not to be operating within specified limits. Where the safety or legality of products is based on equipment found to be inaccurate, action shall be taken to ensure at-risk product is not offered for sale.