1.0 OBJECTIVE
To calibrate the equipment for reliable and accurate results.2.0 SCOPE
This procedure is applicable for balance installed in the quality control department.3.0 RESPONSIBILITY
3.1 Doing: Technical Assistant3.2 Checking: Executive /Manager
4.0 ACCOUNTABILITY
Head of the Department5.0 PROCEDURE
5.1 Operate the instrument as per respective Standard Operating Procedure.5.2 Switch ‘ON’ the instrument.
5.3 Switch ‘ON’ the balance.
5.4 The display will blink with 8.8.8.8.8.8.
5.5 After few seconds, the display will show 0.00 g.
5.6 If display is not stable, press the TARE key & wait till the display shows 0.00 g.
5.7 Perform internal calibration and in Annexure-II
5.6 For Accuracy
5.6.1 Place 5 gm. on the weighing pan.5.6.2 Note the weight.
5.6.3 Calculate the difference between the weight in certificate and observed weight.
5.6.4 Repeat the above steps using 50gm & 100 gm. weights.
5.6.5 Record the reading in Annexure-II.
Related: Drift and Its Importance in Analytical Balances
5.7 For precision
5.7.1 Place 5 gm. in the weighing pan.5.7.2 Note the weight .
5.7.3 Repeat the above two steps nine times.
5.7.4 Record the weight in Anenxure-I .
5.8 Calculate the Standard deviation.
5.9 Calculate the measurement uncertainty using following equation.
2 X SD
Measurement uncertainty = ------------------------------------
Actual weight from certificate
5.10 Frequency
Internal calibration and accuracy = DailyPrecision: Once in a month
6.0 ABBREVIATIONS
6.1 SD= Standard deviation6.2 gm.= Gram
ANNEXURE-I
QUALITY CONTROL LABORATORY
CALIBRATION REPORT OF BALANCE
CALIBRATION DATE
|
DATE OF LAST CALIBRATION DONE
|
NEXT DUE FOR
CALIBRATION
|
INSTRUMENT DETAILS
| ||
INSTRUMENT NAME
| INSTRUMENT MAKE |
INSTRUMENT
IDENTIFICATION NO.
|
OBSERVATION
|
Weight box Id.No.:__________________
For Precision
Theoretical
Weight
|
Actual weight from
Certificates
|
Observed weight
|
Measurement
uncertainty
|
Tolerance
|
5gm.
|
Not more than 0.10
| |||
SD:
| ||||
ANNEXURE-II
Q. C. DEPARTMENT
DAILY CALIBRATION RECORD
NAME OF THE INSTRUMENT : BALANCE
MAKE : ADAIR DUTT
MODEL NO : AD-180
IDENTIFICATION NO. :
Weight box Id.No.:________________
Accuracy:
Date
|
Internal
calibration
|
Observed
wt for 5gm
|
Difference
|
Observed
wt for 50gm
|
Difference
|
Observed
wt for 100gm
|
Difference
|
Calibrated
by.
|
Checked
by
|
Limit :
No.
|
Theoretical weight
|
Actual weights from certificates
|
Tolerance
|
1
|
5 gm.
|
+/- 5mg
| |
2
|
50.0 gm.
|
+/- 5mg
| |
3
|
100.0gm.
|
+/- 5mg
|
Get ready to use editable documents in MS-Word FormatView List
can say for minimum weight selection for calculation of measurement of uncertanity
ReplyDeletei m satisfied from the sops. as well as appreciates
ReplyDeleteSir Calibration done on the basis of Theoretical wt. or actual certified wt. Please suggest
ReplyDeleteActual weights
DeleteObviously with actual weights.
ReplyDeleteDear Sir
ReplyDeleteThanks for suggestion but Sir we will calibrate every year our weight stone and every year certified actual weight changed from standard weight. (i.e. 5 kg standard weight but in certificate it shows 4.997 kg or 4.999 kg, in this condition we changed every year log book & sop balance calibration & verification format due to change in wt ( In certificate by different Party )
Sir I am not meeted with uncertainty 0.001 as per guidlence please suggest me.
ReplyDeleteDear Sir,
ReplyDeleteThanks for the SOP. Please suggest the procedure to fix the acceptance criteria of Intermediate checking of balance and any standard reference of the same.
dear Sir,
ReplyDeletecalibration of balance done on monthly basis while verification performed on daily basis.
Due to temperature and humidity some change accrues and to verify and check the accuracy of balnce verification for maintain accurate result is important.
DeleteSir tell about minimum and maximum wt in balance calibration.
ReplyDeleteDear sir,
ReplyDeletePlease tell me which department done the balance calibration responsibility Qc, qa, or store dept.
It would be better if user department will do.
DeleteInternal department should do calibration of balance.
ReplyDeleteThanks sir
ReplyDelete