Pharma Tips

Operating Procedure for Weighing Balances

By: Pharma Tips | Views: 2040 | Date: 23-Jul-2015

Learn how to operate the Weighing Balances using certified standard weights.


Operating Procedure for Weighing Balances

Learn how to operate the Weighing Balances using certified standard weights.


Weighing range:- 0.001 g to 220.000 g.
All the weighing activities to be performed on this balance should be within or equal to the above range.
Whenever there is a need of “Accurate Weighing” below 1.000g, then do not use this balance.
Prerequisites for performing weighing
Assemble the proper equipment, such as containers for weighing, receiving vessels, forceps, pipettes, spatulas of proper size, butter papers etc.

Use containers of such size that the loading capacity of the balance is not exceeded.
Make sure that the container selected is dry & clean.
Materials, which are refrigerated, take care to bring them to room temperature prior to perform weighing.

Balance environment
Check balance level on spirit level indicator (level can be adjusted by screws provided on bottom backside).
Check balance for cleanliness.
If balance is not cleaned, clean it with soft brush.

Balance Calibration
Before performing weighing assure that, balance is calibrated.
If during or before weighing power supply fails, then recalibrate the balance.
Check that all the connections of the balance are proper & balance is ON.
Ensure that balance is kept on a shockproof bench top.
If balance is showing some reading on the display then (ensure that no body requires that reading) press tare key.
Balance should show 0.000.
Open the door from one side & keep container or sampling bag as required & close the door & press tare key.
Then open the door & put required sample.
Add sample till you get desired weight on display & close the door.
After getting stable display, open the door & take out sample with container or sampling bag.
Close the door & press tare key again.

PRECAUTIONS:
To clean the balance use soft brush.
Remove pan & its housing carefully if required (for cleaning).
Clean with damp cloth.
Do not blow air into the chamber under any circumstances.
Never press or touch the weighing pan during weighing.
Always close or open the balance doors gently.


REFERENCE:
Indian Pharmacopoeia.
United States Pharmacopeia.

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