SOP for Calibration of Weighing Balance (Trolley balance)

1.0 Aim: The SOP for calibration of weighing balance (Trolley Balance) is applicable for all departments at the Production site.
2.0 Purpose: The purpose of this sop is to calibrate of weighing the balance of the bin lifting trolley.
3.0 Scope: This sop is applicable to the trolley balance in the department at the plant.

4.0 Responsibility:
4.1 Officer production is responsible for verification.
4.2 The concerned officer department is responsible for monthly calibration.
4.3 Head production and Head quality assurance are responsible for ensuring overall compliance with this SOP.

5.0 Precaution:

5.1 Use the trolley balance for material weighing within its verification range only.
5.2 Ensure that the standard weights used for verification and calibration are within the range and the due date of certification.
5.3 Clean the weighing box and standard weight with a dry lint-free duster before verification and calibration.
5.4 Ensure that during weighing, verification, or calibration, no object touches the arm of the balance trolley.
5.5 Consider the certified value of the calibrated standard weight for the calculation of the tolerance limit.

Related: SOP for coding and calibration of standard weights

6.0 Procedure For Calibration Of Weighing Balance:

6.1 Operation:

6.1.1 Check that the bin lifting trolley with weighing balance is cleaned.
6.1.2 Keep the arm at the down position and place bin lifting trolley arms under the conta-bin.
6.1.3 Connect the power plug of the trolley balance to the power supply.
6.1.4 Put the power supply ON.
6.1.5 Press the ON key on the electronic display.
6.1.6 Wait till the self-check is over.
6.1.7 Check for zero errors and correct if any by pressing the ZERO key.
6.1.8 Lift the conta-bin over the arm of the bin by lifting the trolly slightly.

6.1.9 Ensure that the conta-bin is placed within the marks over the arms.
6.1.10 Ensure that the conta-bin is balanced properly over the arm of the bin lifting trolley.
6.1.11 Finally, lift the conta-bin at the peak position of the bin lifting trolley.
6.1.12 Record the weight displayed on the electronic weighing balance.
6.1.13 Bring down the conta-bin by releasing the lever.
6.1.14 Press the OFF key on the electronics display.
6.1.15 switch the power supply OFF.
6.1.16 Disconnect the power plug of the trolley balanced from the power supply.

7.0 Cleaning of the balance:

frequency: Daily once and whenever required.

7.1 Switch off balance.
7.2 Remove dust from the legs or pan and beneath of legs and platform of the balance with the help of a clean lint-free duster.
7.3 De-dust the electricity wires and other parts of the trolley balance with the help of a lint-free duster.

7.4 Ensure the cleanliness of the SS pallet.
7.5 Keep the arm at the down position and place bin lifting trolley arms under the conta-bin.
7.6 Connect the power plug of the trolley balance to the power supply.
7.7 Put the power supply ON.
7.8 Press the ON key on the electronic display.

7.9 Wait till the self-check is over.
7.10 Check for zero errors and correct if any by pressing the ZERO key.
7.11 Lift the SS pallet over the arm of the bin by lifting the trolly slightly.
7.12 Ensure that the SS pallet is placed within the marks over the arms.
7.13 Ensure that the SS pallet is balanced properly over the arm of the bin lifting trolley.
7.14 Finally, lift the SS pallet at the peak position of the bin lifting trolley.
7.15 Press the REZERO key.
7.16 Put the standard weight on the SS Pallet.
7.17 Perform the weekly verification with the minimum (10% of the balance capacity) intermediate (50% of balance capacity) and maximum (90% of balance capacity) weight of balance capacity as per “verification record for trolley balance.”