Remerciez-le!

Remerciez @Admin pour avoir partagé cet document gratuitement, de la manière la plus simple, en partageant sur les réseaux sociaux.

Guide 60 US Environmental Protection Agency O ?ce of Pesticide Programs O ?ce of Pesticide Programs Microbiology Laboratory Environmental Science Center Ft Meade MD Standard Operating Procedure for Calibration and Maintenance of Weigh Balances SOP Number

US Environmental Protection Agency O ?ce of Pesticide Programs O ?ce of Pesticide Programs Microbiology Laboratory Environmental Science Center Ft Meade MD Standard Operating Procedure for Calibration and Maintenance of Weigh Balances SOP Number EQ - - Date Revised - - CSOP Number Title Scope Application SOP No EQ - - Date Revised - - Page of EQ - - Calibration and Maintenance of Weigh Balances Describes process for use calibration and quality control of weigh balances and reference weights Weigh balances are used to measure the weight of objects in the laboratory such as media and reagent ingredients and disinfectant containers Reference weights are used as reference standards to verify the calibration of the weigh balances SOP Developer Approval Date SOP Reviewer Print Name Print Name Quality Assurance Unit Branch Chief Print Name Print Name Date SOP issued Controlled copy number Date SOP withdrawn CSOP No EQ - - Date Revised - - Page of TABLE OF CONTENTS Contents DEFINITIONS Page Number HEALTH AND SAFETY PERSONNEL QUALIFICATIONS AND TRAINING INSTRUMENT CALIBRATION SAMPLE HANDLING AND STORAGE QUALITY CONTROL INTERFERENCES NON-CONFORMING DATA DATA MANAGEMENT CAUTIONS SPECIAL APPARATUS AND MATERIALS PROCEDURE AND ANALYSIS DATA ANALYSIS CALCULATIONS FORMS AND DATA SHEETS REFERENCES CSOP No EQ - - Date Revised - - Page of De ?nitions ISO International Organization for Standardization Tolerance for weigh balances Acceptable limits or range in measurement in grams that the laboratory can tolerate See Health and Safety None Personnel Refer to SOP ADM- OPP Microbiology Laboratory Training Quali ?cations and TrainingInstrument Calibration Weigh balances are inspected cleaned and calibrated annually by an ISO accredited vendor Perform accuracy check of weigh balances once per year approximately six months after vendor calibration Calibration of the reference weights is performed every two years by an ISO accredited vendor Weights may be calibrated more frequently if deemed necessary e g weight is dropped chipped etc Sample Handling and Storage Wear clean cotton gloves supplied with reference weights or use forceps while handling reference weights To avoid depositing oil and dirt onto the surface of the weight do not touch weights with bare hands Store reference weights in cases provided by the manufacturer Quality Control For quality control purposes the required information is documented on the appropriate form s see section Interferences For optimal performance place balance on a stable even horizontal surface with minimal vibration Avoid areas with excessive heat and moisture direct sunlight aggressive chemical vapors and drafts If a balance is transferred to a di ?erent location perform the accuracy check section prior to use in the new location Nonconforming Data When verifying the calibration of weigh balances section con ?rm any discrepancies in weight measurements by repeating the operation Notify a service representative if necessary to re-calibrate the instrument when the calibration check shows that the weigh balance is outside of the acceptable tolerance range see section Replace the equipment if the vendor determines that a weigh balance or reference weight is out of tolerance and cannot be properly calibrated