Calibration of Single Pan Balance
Calibration of Single Pan Balance
1.0 PURPOSE
The purpose of the standard operating procedure is to provide guidelines for calibration of Single Pan Balance.
2.0 SCOPE
The scope of this standard operating procedure includes calibration of Single Pan Balance.
3.0 RESPONSIBILITY
3.1 Section In charge
3.2 Technical Manager
3.3 Q.A. Manager
4.0 PROCEDURE
4.1 PRECAUTION BEFORE CALIBRATION:
4.1.1 Ensure that the analytical balance used for weighing should be levelled at zero levelling and is supported on a vibration free rigid table base.
4.1.2 Ensure that a consistent ambient or fixed room temperature is maintained. There should be no movement of air or air from ceiling fan etc.
4.1.3 Ensure cleanliness of the analytical balance.
4.2 APPARATUS REQUIRED FOR CALIBRATION:
4.2.1 Calibrated weight box traceable to either NPL or NABL accredited laboratory.
4.2.2 Ensure that the calibrated set of weights is clean and free from any dust particles and any type of deformity.
4.3 CALIBRATION PROCEDURE:
4.3.1 Weigh one by one the standard calibrated set of weights on the balance and record the weights as indicated on the balance.
4.3.2 Repeat the weighing of each set of weights at least two to three times to ensure greater accuracy and reproducibility.
4.3.3 Ensure the precision and accuracy of weighing.
4.4 REPORTING
4.4.1 From the assigned weights of the standard set of weights correlate the accuracy of the weights observed on the balance under calibration.
4.4.2 Make a table for the observed weight on balance of the standard weights, and the actual calibrated weight of the set of weights.
4.4.3 The average of the weights shall be reported same as digits displayed on the balance screen.
- ACCEPTANCE CRITERIA
The balance (to be calibrated) should display the weights in the tolerance limits as given in the table below against the standard weights used:
|
S.No. |
Denomination Metric |
Tolerance Limits(g)* |
|
1 |
100g |
0.0005 |
|
2 |
50g |
0.0003 |
|
3 |
20g |
0.0025 |
|
4 |
10g |
0.0002 |
|
5 |
5g |
0.0015 |
|
6 |
2g |
0.0012 |
|
7 |
1g |
0.0001 |
|
8 |
500mg |
0.00008 |
|
9 |
200mg |
0.00006 |
|
10 |
100mg |
0.00005 |
|
11 |
50mg |
0.00004 |
|
12 |
20mg |
0.00003 |
|
13 |
10mg |
0.00025 |
|
14 |
5mg |
0.00002 |
|
15 |
2mg |
0.00002 |
|
16 |
1mg |
0.00002 |
*
With reference to OIML – International Recommendation R111.
FAQs
1. What is the purpose of single pan balance calibration?
Single pan balance calibration ensures that the balance provides accurate and reliable measurements, supporting quality control and assurance processes in laboratories and industrial settings.
2. How often should single pan balances be calibrated?
The frequency of calibration depends on factors such as usage, environmental conditions, and regulatory requirements. Typically, balances are calibrated at regular intervals, ranging from monthly to annually.
3. Can I calibrate a single pan balance myself?
While it is possible to calibrate a single pan balance yourself, it is recommended to engage qualified personnel or calibration services to ensure accurate and reliable results.
4. What happens if a single pan balance is not calibrated regularly?
Failure to calibrate a single pan balance regularly can lead to inaccurate measurements, compromising the integrity of experiments, formulations, or production processes.
5. Is calibration necessary for all types of balances?
Yes, calibration is necessary for all types of balances to ensure accurate and reliable measurements, regardless of their design or functionality.
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