4. Simple balances were used as early as 5000 B.C.
"balance" comes from the Latin word bilanx which means "two pans.“
The modern analytical balance originated during the mid-18th
century.
The lightweight technique is developed Joseph Black.

5. In lab for daily weighing
Analytical Balance
Micro balance
Top load balance
100mg – 100g
2.0 mg – 20.0g
1.0 g – 2.0 kg

6. Analytical Balance
Class-I
Low-capacity
&
high-sensitivity balances
Top load balance
100mg – 100g
2mg – 20g
1.0 g – 2.0 kg
Micro balance
5µg – 500mg
Semi Micro balance
Class-II
Built-in weights for
analytical balances
&
Laboratory weights for
routine analytical work
Class-III & IV
Precision balances
&
All other weighing
equipments

7. The Analytical Balance location on a solid bench
that is AVT (anti vibration table)
The precision and reproducibility of weighing
results is closely associated with the location of
the balance.
Stable anti vibration table-has affect on balance
for measurement 0.01g or less.
Doesn't locate AVT corner of the room-room
access through a sliding door.
Location free from air should not be near ovens,
furnaces.
The Analytical Balance Room must be temperature
and humidity controlled.
humidity range 45 - 60% Operate
humidity range <20 – 80<% Never operate

8. The balance should not be installed near sources of
electromagnetic radiation such as radio frequency
generators, electric motors, hand held communication
devices (including card less telephones and cell phones)
The balance should not be adjacent to equipment producing
a magnetic field(a magnetic stirrer)
Low humidity increases buildup of static electricity.
Never disconnect the balance from the power supply
and leave it always switched on / STAND BY mode.
If “OFF” mode: warm-up for 1 hour after switching
‘ON’ the power supply

9. 1. Ensure that the instrument is clean and free from dust
with smooth brush (or) lint free duster
2. Silica gel should kept inside the balance chamber
3. Adjusting the bubble at the center
4. Before using ensure that the balance is calibrated
5. While weighing any sample use butter paper & spatula
6. Carefully remove any sample residue / spilled powder
7. Take special care during weighing of liquids
8. Before closure ensure that the pan is empty
Don’t use ….A4 / A3 papers

10. Date: Time
Make:
Model:
Ser no:
Instrument ID:
&
Initial weight: (mg/g)
pressing print key
Number of weights
Mean
SD
Min
Max
Dif
Tare weight pressing print key
pressing print key
‘STAT” key
Ending
Date: Time
User:
pressing print key
‘F/CF” key
Sample name:
AR No:
Test:
Sign:
Stamp

11. Analytical Balance
Micro balance
Top load balance
Daily with secondary standard weight box
Monthly with Primary standard weight box
Daily & Monthly with Primary standard weight box
Weakly with primary standard weight box

12.  Store the weight box in dust free area
 Handling the weights use a forceps
 Use certified weights only, before use
check for the validity of usage
forceps

13. Analytical Balance
Daily with secondary standard weight box
Daily calibration :
S No Nominal weight
Acceptance criteria of
actual weight
1 1 g ± 1mg
2 10g ± 2mg
3 100g ± 20mg
4 100mg ± 0.1mg
5 10mg ± 0.01mg100mg – 100g
Drift check: check with 20g weight
Calculation formula W1-W2
W1: before day drift check 20g weight
W2: present day drift check 20g weight
The limit is not more than ± 0.0002g

14. Analytical Balance
Monthly with Primary standard weight box
Monthly calibration :
1. self-calibration
2.Calibration with External Calibration standard weights
100mg – 100g
S No Nominal weight
Acceptance criteria of
actual weight
1 100g ± 20mg
2 50g ± 20mg
3 20g ± 10mg
4 10g ± 2mg
5 5g ± 2mg
6 2g ± 1mg
7 1g ± 1mg
8 500mg ± 0.5mg
9 200mg ± 0.2mg
10 100mg ± 0.1mg
11 50mg ± 0.05mg
12 20mg ± 0.02mg
13 10mg ± 0.01mg

15. Analytical Balance
Monthly with Primary standard weight box
Monthly calibration :
100mg – 100g
3.Drift check: check with 20g weight
Calculation formula W1-W2
W1: before day drift check 20g weight
W2: present day drift check 20g weight
The limit is not more than ± 0.0002g
4.Uncertainty Test (for five decimal balances):
Take 1g standard weight for this
Take at least 10 replicate reading for the same
9
2
8
7 6
3
5
4
10
Calculate the Standard deviation
Then calculate the uncertainty as follows
3 X SD
-------------
Mass value
It should be not more than 0.001

16. Daily calibration :
S No Nominal weight
Acceptance criteria of
actual weight
1 20 g ± 10mg
2 1g ± 1mg
3 100mg ± 0.1mg
4 50mg ± 0.05mg
5 2mg ± 0.002mg
Drift check: check with 1g weight
Calculation formula W1-W2
W1: before day drift check 1g weight
W2: present day drift check 1g weight
The limit is not more than ± 0.0001g
Micro balance
Daily with Primary standard weight box
2.0 mg – 20.0g

17. Monthly with Primary standard weight box
Monthly calibration :
1. self-calibration
2.Calibration with External Calibration standard weights
S No Nominal weight
Acceptance criteria of
actual weight
1 100g ± 20mg
2 50g ± 20mg
3 20g ± 10mg
4 10g ± 2mg
5 5g ± 2mg
6 2g ± 1mg
7 1g ± 1mg
8 500mg ± 0.5mg
9 200mg ± 0.2mg
10 100mg ± 0.1mg
11 50mg ± 0.05mg
12 20mg ± 0.02mg
13 10mg ± 0.01mg
Micro balance
2.0 mg – 20.0g

18. Monthly with Primary standard weight box
Monthly calibration :
3.Drift check: check with 20g weight
Calculation formula W1-W2
W1: before day drift check 20g weight
W2: present day drift check 20g weight
The limit is not more than ± 0.0002g
4.Uncertainty Test (for five decimal balances):
Take 1g standard weight for this
Take at least 10 replicate reading for the same
9
2
8
7 6
3
5
4
10
Calculate the Standard deviation
Then calculate the uncertainty as follows
3 X SD
-------------
Mass value
It should be not more than 0.001
Micro balance
2.0 mg – 20.0g

19. Weekly with Primary standard weight box
Weekly calibration :
Nominal
weight
Actual value Observed reading
Acceptance criteria
of actual weight
400g 400.000350 400.00 ± 0.02g
200g 200.000170 200.00 ± 0.02g
50g 50.000050 49.99 ± 0.02g
20g 20.000021 19.99 ± 0.01g
5g 4.999998 4.99 ± 0.01g
1g 1.000016 1.00 ± 0.01g
Top load balance
1.0 g – 2.0 kg

20. S No Nominal weight
Mass Value of the
weight (A)
Observed Value
(B)
Error 'E' (A-B)
1 100g 100.00009g 99.99968 0.00041
2 20g 20.000021g 19.99994 0.000081
3 10g 10.000019g 9.99993 0.000089
4 1g 1.000016g 1.00003 -0.000014
5 100mg 100.005g 100.00 0.005
6 10mg 10.002g 10.00 0.002
Primary weight box :
S No Nominal weight Mass Value
Acceptance
criteria
Tolerance Limit
Upper Limit Lower Limit
1 100g 99.999910 ± 20mg 100.01991 99.97991
2 20g 20.000041 ± 10mg 20.010041 19.990041
3 10g 10.000029 ± 2mg 10.002029 9.998029
4 1g 1.000036 ± 1mg 1.001036 0.999036
5 100mg 100.005 ± 0.1mg 100.105 99.905
6 10mg 10.002 ± 0.01mg 10.012 9.992
Secondary weight box :

23. Don’t weigh like this……

24. weigh like this !

25. Special thanks to
Ushakiran madam
&
GLP Team
Your’s