SOP For Internal & External Calibration Of Equipments/Instruments

SOP For Internal & External Calibration Of Equipments/Instruments


To describe a procedure for the calibration of equipments/instruments.

  • SCOPE:

This SOP is applicable for calibration of equipments/instruments which are calibrated externally


Assistant Engineer/Above – Engineering shall be responsible for implementation and compliance of the Standard Operating                          Procedure.


Manager– Engineering / Manager – Production / Head – QA shall be accountable for implementation and compliance the                             procedure mentioned in this Standard Operating Procedure.

5.0       ATTACHMENT:

Annual Equipment/Instrument Calibration Schedule                         -Attachment-I

6.0     PROCEDURE:

  • All the equipments/ instruments associated with the processing and testing of materials and products     shall be calibrated as per respective SOPs.
  • Each Equipment/ Instrument shall be calibrated periodically In-house (as per respective SOP) or from   certified outside agency traceable to In-House Standards or NIST/ ETDC/NPL any other applicable agency standards.
  •  Calibration SOP of respective Instrument/ Equipment shall contain the procedure of calibration and calibration frequency and acceptance criteria.
  •  “Annual Equipment/ Instrument Calibration Schedule” shall be prepared by Engineering, Concerned    Department & QA personnel for all equipments/ instruments in Format No. SOP/EN/002
  •   The traceable of regular calibration shall be followed as per their frequency and the due date in calibration schedule.
  •   The calibration schedule consists of the Instrument ID and its location/ equipment connected, next  due of calibration. After performing the calibration within the grace period from its due date, the date of calibration shall be entered in the schedule with sign.
  • The calibration data shall be entered in the calibration report.
  • Calibration shall be carried out within +5 days for half yearly & +10 days for annual calibration from the due date. The instruments having daily and monthly calibration schedules should calibrate on the due date itself.
  • If there is continuous production even in the total grace period from the calibration due date of  equipment/ instrument. Then the calibration activity shall be performed immediately after completion of production or of any deviation is observed in the instrument related to that equipment/area which is in continuous production.
  • Before starting the calibration activity, the same shall be intimated to the concerned user department personnel for clearance.
  • During calibration tag the instrument/ equipment with “UNDER CALIBRATION” label filled as per Attachment-I.
  • If the equipment’s/Instruments pass the calibration test, put “CALIBRATED” label duly filled as per Attachment-II.
  •  If the equipment’s/Instruments fails in calibration test, put “CALIBRATION FAILED” label duly filled as per Attachment-III, and the equipment/Instrument shall not be used till the instrument repaired            or replaced and calibrated.
  • If any Equipment/ Instrument fail the calibration, failure shall be investigated by the Head – concerned department, Head – Engineering & Head – QA. The reason for failure and the effects of failure on quality of product since last calibrated shall be covered during investigation and appropriate action is taken.
  • In case of the calibration is performed due to a break down repair, change of parts or for any other reason before the next schedule date of calibration the same shall be recorded in the respective calibration record.
  • In case of new equipment/instrument installation, the calibration schedule of new equipment/instrument shall be updated for every three months with separate annual schedule sheet adding to the existing schedule.
  • In case an external agency has calibrated the equipment, the calibration certificate shall be signed with authorized persons from QA and Engineering personnel as a mark of acceptance.




SOP       : Standard Operating Procedure

Engg      : Engineering

NIST     : National Institute of Standard Tests

NPL      : National Physical Laboratories

ETDC    : Electronic Test and Development Centre

Quality Assurance
Quality Control
Personnel & Administration


Version No. Effective Date Reason for Revision