Calibration systems

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Text of Calibration systems

  • MODULE - III STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/1
  • Calibration A set of operations, performed in accordance with a definite documented procedure, that compares the measurements performed by an instrument to those made by a more accurate instrument or standard, for the purpose of detecting and reporting or eliminating by adjustment, errors in the instrument tested. As per ISO/IEC Guide 2 STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/2
  • Calibration definition (a) operation establishing the relation between quantity values provided by measurement standards and the corresponding indications of a measuring system, carried out under specified conditions and including evaluation of measurement uncertainty definition (b) operation that establishes the relation, obtained by reference to one or more measurement standards, that exists under specified conditions, between the indication of a measuring system and the measurement result that would be obtained using the measuring system As per VIM STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/3
  • Why to Calibrate ? Initial calibration assures T&ME with in Spec Periodic calibration is essential to maintain control of measurement process made by TME Assures common reference i.e Traceability to National / International standards Ensures that equipment has been satisfactorily working since last calibrated & assumed that the equipment continues to work satisfactorily until next calibrated Calibration records study enables extending/reducing the calibration interval STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/4
  • OBJECTIVES OF CALIBRATION Maintaining traceability of measurements Uncertainty limits Traceability Reference measurements STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/5
  • Why Calibration & Traceability are intertwined? To measure the Same Measure Interchangeability of products Legal requirement & consequence of liability To demonstrate metrological confirmation of product Consistent control of product/measurement STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/6
  • When is calibration not required? When equipment is not in use . When eqpt is used as null detector When eqpt is used as transfer device whose measurement or output value is not explicitly used. Fundamental / Absolute standards. When instrument is fail-safe When instrument makes measurements or provides known outputs which are monitored by a calibrated device, meter or gage during use. STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/7
  • When to Calibrate ? - Calibrate too often it is waste of time and money. - Calibrate too seldom it is waste of product or wrong decisions. - Balance between cost to calibrate and cost not to calibrate - Universally Applicable single best practice for establishing & adjusting cal interval not available. - Refer DAP, RP1 STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/8
  • Where to Calibrate? Calibration is performed in the I/II/III party laboratory under controlled environment. (The environment need only to be controlled to the extent required.) Accredited Calibration Laboratory Manufacturers / Suppliers Laboratory ensuring valid traceability STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/9
  • Where to Calibrate ?contd Accredited Laboratory ensuring the quality of calibration services. In the absence of the above, the services of calibration laboratory for the parameter of interest may be availed ensuring meeting technical requirements of ISO/IEC 17025. STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/10
  • Basic Requirements - Location/ Environment Noise Level Vibration EMI/EMC Cleanliness Lighting Power supply Accessibility STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/11
  • Basic Requirements Location/Environment Quiet * Away from heavy traffic, factories, workshop etc * Effective separation from non compatible areas * Noise : less than 60 dbA * Vibration : Taken care in building design & site selection noticeable in galvanometers, mercury column, mass balance, dimensional measuring equipment 0.25m max displacement amplitude from 0.1Hz to 30Hz and 0.001 g max 30Hz to 200Hz * EMI : * taken care in site selection & use of shielding/ filtering * field strength to be less than 100V /m STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/12
  • Basic Requirements Location/Environment Clean Good house keeping Higher degree of particulate control (Dimensional & Mass Metrology) Good lighting Recommended level of illumination is 450 700lux Fluorescent lamps preferred to minimize heating effect Services Separate feeder line Uninterrupted / Regulated power supply (+- 5%) Adequate measures against spikes & transients Mains Earthing (< 1 ohm) Adequate measures against ground currents STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/13
  • Basic Requirements Location/Environment Accessibility Standards / equipment Firefighting devices Quality System Document & Instrument Manuals STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/14
  • Calibration laboratory - basic requirements Location Permanent/On-site Temperature Humidity Environment Air flow Equipment Filtration Electromagnetic Screening Staff Noise Level Vibration Management EMI/EMC Documents Cleanliness Reference standards Lighting Records Transfer Standards Power supply Calibration Working standards AccessibilityTraining Connecting leads Receiving & Calibration areaAuthority adaptors/accessoriesResponsibility Subsidiary equipmentTechnical Computers & automationCompetence software STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/15
  • Basic Requirements Equipment Transfer Standards Reference standards (Optional) Working standards Connecting leads and adaptors Subsidiary equipment Computers & automation software STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/16
  • Basic Requirements Personnel Training Authority Responsibility Technical Competence STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/17
  • Basic Requirements Management Quality management & Technical operations Traceability Calibration interval Audits/ Management reviews Implementation of corrective /preventive actions STQCVersion 1.0 CERTIFIED CALIBRATION PROFFESSIONAL MIII/CH1/18
  • Calibration System Why Calibration system ? - To meet the commitment of the industry to provide quality product. - TMI is required to be controlled to provide this assurance. - Through calibration - Shall include all the elements necessary for ready detection of equipment deficiencies and provide objective evidence of conformance in the form of records.