Digital Balance - Operation & Calibration

By: Pharma Tips | Views: 23419 | Date: 03-Sep-2011

Standard Operating Procedure:To ensure correct method of operation for balance.

SOP FOR OPERATION

1.0 PURPOSE:
To ensure correct method of operation for balance.

2.0 SCOPE:
It covers the procedure for operation of balance
MAKE:SHIMADZU MODEL: LIBROR AEG-45SM

3.0 RESPONSIBILITY:
Chemist-QC

4.0 ACCOUNTABILITY:
Manager-QC

5.0 DEFINITION:
It is a balance which shows the weight of a substance digitally and is used to weigh chemicals in labs

6.0 PROCEDURE:

Eletronic Balance

6.1 Make sure that the balance is kept clean.
6.2 Ensure that the calibration status is valid.
6.3 Ensure that spirit level is in the center of the circle.
6.4 Connect the power cable to the mains and switch ‘ON’.
6.5 Automatically self checking starts from “che-3” & ends with OFF.
6.6 Press ON/OFF key, all the display will glow.
6.7 Press “TARE KEY ”, 0.00000 mark appears on the display.
6.8 The stability of the reading is obtained which is indicated by an arrow mark on the left side of the display.
6.9 Once the stability is attained, the balance is ready for weighing.
6.10 Place the material to be weighed on the pan & note down the reading after the arrow mark appears on the left side of the display.
6.11 After completion of weighing press, “ON/OFF” key. “ STAND BY” light glows.
6.12 Clean the balance immediately after weighing.
6.13 PRECAUTIONS:
6.13.1 Do not weigh on the pan directly. Always use butter paper.
6.13.2 Do not place heavy glassware on the pan. It may damage the instrument
6.13.3 Do not weigh corrosive acids & hot materials.
6.13.4 Do not shift the balance once positioned
6.13.5 Do not give shock to pan or table.
6.13.6 Close the glass doors on the sides and top before recording the weights
6.13.7 Handle the balance gently and carefully.
6.13.8 Do not press the material on the pan with spatula
6.13.9 Do not spill any material during weighing.
6.13.10 Do not use butter paper size more than the area of pan
6.13.11 Dry the silica gel for every week.
6.13.12 After completion of weighing keep the inside area clean .

7.0 REFERENCES:
Instrument Manual

8.0 ENCLOSURES:
Nil
9.0 ABBREVIATIONS:
Nil

NOTE:
1. Always keep the balance in “ STAND BY” position when not in use.
2. Note down the reading only after obtaining stability indicated by an arrow mark at the left side of the display board.

DIGITAL BALANCE
SOP FOR CALIBRATION

1.0 PURPOSE:
To provide a procedure for calibration of balance.

2.0 SCOPE:
This covers the calibration procedure for balance. (Instrument No:QC-001)

MAKE: SHIMADZU MODEL: LIBROR AEG-45SM

3.0 RESPONSIBILITY:
3.1 Chemist-QC
3.2 Officer-QC

4.0 ACCOUNTABILITY:
Manager-QC

5.0 DEFINITION:
Nil
6.0 PROCEDURE:
6.1 DAILY
6.1.1. Ensure that balance is aligned properly and cleaned i.e. the spirit level should be in the center of the circle.
6.1.2
6.1.3 Ensure that the display shows 0.00000
Place 4 standard weights of different denominations as per the schedule & record the weight.
6.1.4 The observed weight should confirm with the acceptance criteria as given in the balance log sheet.
6.1.5 If the instrument goes out of calibration contact the service person for necessary adjustment and recalibrate.

6.2. FREQUENCY OF CALIBRATION : Daily

7.0 REFERENCES:
Instrument Manual

8.0 ENCLOSURES:
Enclosed a table for Acceptance Criteria for Standard Weights, Calibration report format & Calibration schedule.

9.0 ABBREVIATIONS:
Nil
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