Procedure for Cleaning ,Calibration and Operation of the Analytical balance

1.0 OBJECTIVE
To lay down a procedure for cleaning, calibration & operation of the analytical balance.
2.0 SCOPE
Module-1,2,3,4 & 5
3.0 RESPONSIBILITY
Production officer.
QA chemist.
4.0 ACCOUNTABILITY
Production Executive.
5.0 PROCEDURE
5.1. Cleaning.
5.2. Calibration.
5.3. Operation.
5.4 Shut down.
5.1 Cleaning
5.1.1 Ensure that the power supply to the balance is switched ‘off’ before cleaning.
5.1.2 Clean the pan and inside of the balance with brush.
5.1.3 Clean the outside of the balance with clean and dry lint free duster every day.
5.2 Calibration
5.2.1 Frequency of calibration
5.2.2 Self Calibration Procedure - Frequency daily and after each maintenance job.
5.2.2.1 Clean the balance as per procedure given in 5.1
5.2.2.2 Check that air bubble is at the center of the level indicator and if required adjust the level by turning the leveling screws.
5.2.2.3 Switch on the balance and allow it to stabilize for 30 minutes.
5.2.2.4 Press the ‘cal’ button.
5.2.2.5 After a few seconds the display should read 0.0000 g that denotes the end of self calibration.
5.2.2.6 Incase of display ‘error’ tare and press ‘cal’ key again ensure 0.0000 g
5.2.3 Calibration against Standard weights Frequency every month and after each maintenance job.
5.2.3.1 Clean the balance as per procedure given in 5.1
5.2.3.2 Check the weight of the standard weights 100mg,5g,20g,50g
5.2.3.3 Record the observations in calibration record.
5.2.3.4 If the variation is more than the least count label the balance ‘out of order’.
5.2.3.5 Error must be rectified and balance should be calibrated before use.
5.3. Operation
5.3.1 Ensure that balance is properly connected to the power supply.
5.3.2 Check that the air bubble of level indicator is at the center, and if required adjust the level by turning the leveling screws.
5.3.3 Switch on the main switch, this balance displays ‘88888888’ followed by 0.0000 g.
5.3.4 Place a clean petridish, close the balance door and press tare button on the bar to tare the petridish weight. The display should read 0.0000g.
5.3.5 Place the required No. of tablets/capsules on petridish and close the balance door.
5.3.6 Wait until the stability symbol “g” displayed, then read of weight.
5.4 Shut down
5.4.1 Clean the balance as per procedure given in 5.1
5.4.2 Switch ‘off’ the balance.
5.4.3 Switch ‘off’ the mains.