STANDARD OPERATING PROCEDURE CALIBRATION OF BALANCE ( Make: CITIZEN & AFCOSET) ( Make: CONTECH & SNUG )

STANDARD OPERATING PROCEDURE

SUBJECT :                     CALIBRATION OF BALANCE ( Make: CITIZEN & AFCOSET) ( Make: CONTECH & SNUG )

DEPARTMENT           : QA SOP NO.                      : Page No                       : Effective Date             : Next Review                : SOP REVISION           :

1.0       OBJECTIVE:

To provide guidelines for Calibration of Balance.

2.0       POLICY:

           

Calibrated balances are used for maintaining accuracy of weights.

3.0       PROCEDURE:

3.1       The Balance should be checked for leveling of the base by spirit level, before operating.

3.2       Self calibrate the balance before use.

3.3       Self calibration procedure for Afcoset balance is as follows.

3.4       The balance has “CAL” knob which is used to self calibrate the balance.

3.5       To self calibrate the balance ensure that there is no dust in the weighing chamber and on the pan. If necessary clean.

3.6       Press “CAL” The display will be cal & then “CAL IN” and then CAL DN”.

3.7       When the display is “CAL DN”. Slowly brings the triangular knob on the right side to down position

3.8       When the display is “CAL UP”. Slowly brings the triangular knob on the right side to up position. The knob is brought to the original position slowly.

3.9       The display will be “CAL END”.

3.10     The calibration has been successfully completed.

3.11     After successful completion of calibration the display will be 0.0000g.

3.12     In case if the calibration is incomplete then there will be “Cal error” display.

3.13     Self calibrate the balance daily once at the start of the day and whenever power shutdown and balance comes to off position.

3.14     Self calibration procedure for citizen balance is as follows.

3.15     Citizen balance has an automated calibration system. Whenever balance is switched on the balance calibrates all by itself and gives the display of 0.0000 g weight, which indicates that the balance is calibrated. During power failure also the balance calibrates automatically.

 

3.16     Verification and calibration of balance is done on daily basis by using standard weights.

3.17     Clean the standard weights with tissue paper and place the standard weights on pan with forceps and note the readings after the display is stable.

3.18     Standard weights used for higher limit range verification are 1g, 2g, 5g, 10g, 50g, and for lower limit range verification use 20mg, 50mg &100mg weights.

3.19     The weight displayed by the above weights is recorded in the calibration register.

The reading of the standard weight shall not be more than the Tolerance limited as specified in the calibration record.

3.20     After recording the readings place the weights back in the weight box with forceps, close the weight box and keep in a secured place.

3.21     Calibrate the citizen and Afcoset balances once in 3 months, with 10mg, 20mg, 100mg, 200mg, 500mg, 1g, 2g, 5g, 10g, 50g, 100g, 150g (Afcoset) & 200g (citizen) and record the readings in the calibration register.

3.22     Calibrate the snug and contech balances once in 3 months, with 10mg, 20mg, 100mg, 200mg, 500mg, 1g, 2g, 5g, 10g, 50g, 100g, 120g (contech balance) and 150g (snug balance) record the readings in the calibration register.

3.23     The standard weights are calibrated by external agency, once in a year.

4.0       FREQUENCY:  Verification check is done daily before use. Calibration is done once in 3 months.

5.0       RESPONSIBILITY:  Executive Q.A.

6.0       REVIEW GUIDE:  Calibration Register.

7.0       ANNEXURE: -------

8.0       SOPs DISTRIBUTION:

            This SOP shall be distributed to following Departments:

Name of the Department	Master Copy	Circulatory Copy
QA/QC	√	√
Production	x	x
Warehouse	x	x
General	x	x
Maintenance	x	x