Monthly calibration of
analytical balance
Purpose:
To lay down a procedure for calibration
of the analytical balance
Responsibility:
Microbiologist / Chemist Q.C.
Accountability: Head of Q.C. / Q.A.
Procedure:
· Ensure that analytical balance is
clean.
· Check the level of the balance
with the help of sprit level. If the bubble is not in the center set with the
help of two screws on the front side.
· Operate the analytical balance as
per SOP
·
Put on the weight of one by one on
the pan. (given in Table).
·
Record the value on Format
·
Fill the calibration tag and
attached it with analytical balance.
·
Inform to Head of Q.A. in case any
problem observed.
Eccentricity:
Place
the 50 g weight at position “E” (center
position) and press tare key.
The display shows zero.
Move
the weight to test points A, B, C & D as shown in Fig. 101.1 and record
the
observation.
Acceptance
Criteria:
±
0.00001g (Model: GR202)
± 0.0001g (Model:
GR200)
Uncertainty: Fig.
Take the 10 replicate weighing of 100 mg weight and record the
weighing.
Calculate measured uncertainty using the formula given below
3
x Standard Deviation
Measured
Uncertainty: ……………………………....
Standard
Weight
Limit: NMT 0.001 (0.1 %)
Frequency: Monthly
calibration of analytical balance
|
Standard Weight |
Limit |
|
160 g |
159.84 to 160.16 g |
|
100 g |
99.9 to 100.1 g |
|
*50 g |
49.950 to 50.05 g |
|
20 g |
19.98 to 20.02 g |
|
10 g |
9.99 to 10.01 g |
|
5 g |
4.995 to 5.005 g |
|
2 g |
1.998 to 2.002 g |
|
*1 g |
0.999 to 1.001 g |
|
500 mg |
499.5 to 500.5 mg |
|
*200 mg |
199.8 to 200.2 mg |
|
*100 mg |
99.9 to 100.1 mg |
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