Standard Operating Procedure (SOP): Operation of Single Pan Weighing Balance
Purpose:
The purpose of this Standard Operating Procedure (SOP) is to provide detailed instructions for the proper operation of a Single Pan Weighing Balance. This SOP ensures accurate and reliable measurements of the mass of substances, which is essential for various laboratory and industrial applications.
Scope:
This SOP applies to all personnel involved in operating and maintaining the Single Pan Weighing Balance in a laboratory or testing environment.
Responsibility:
Laboratory personnel: Responsible for performing weighing operations as per this SOP.
Quality Assurance (QA): Responsible for reviewing and approving this SOP.
Procedure:
4.1. Equipment and Materials:
Single Pan Weighing Balance
Calibration weights of known mass (if applicable)
Sample(s) to be weighed
Anti-static measures (if required)
Cleaning materials (lint-free cloth, brush, etc.)
4.2. Pre-Operational Preparations:
4.2.1. Ensure that the weighing balance is clean, free from any debris or residual substances.
4.2.2. Familiarize yourself with the specific operating instructions and technical specifications provided by the manufacturer for the particular model of the weighing balance being used.
4.2.3. Check that the weighing balance is properly leveled to ensure accurate measurements.
4.2.4. Gather all necessary equipment and materials.
4.3. Calibration (if applicable):
4.3.1. Calibrate the weighing balance using the appropriate calibration weights of known mass.
4.3.2. Follow the calibration procedures specified by the manufacturer or the laboratory’s standard operating procedures.
4.3.3. Document the calibration process and results as per the laboratory’s document control procedures.
4.4. Sample Weighing Procedure:
4.4.1. Ensure that the weighing balance is at room temperature to minimize the effects of temperature variations.
4.4.2. Place the weighing container (such as a weighing boat or weighing paper) on the weighing pan.
4.4.3. Allow the weighing balance to stabilize and display a stable reading or zero value.
4.4.4. Carefully add the sample to the weighing container, ensuring that no spillage occurs and the sample does not come into direct contact with the weighing pan.
4.4.5. Allow the weighing balance to stabilize and display the mass of the sample.
4.4.6. Record the measured mass of the sample.
4.5. Post-Weighing Procedures:
4.5.1. Remove the sample from the weighing pan, ensuring that no residual material is left behind.
4.5.2. Clean the weighing pan and weighing container using appropriate cleaning materials, such as a lint-free cloth or brush, to remove any residue.
4.5.3. Store the weighing balance in a clean and secure location, following the manufacturer’s guidelines for proper storage.
Records:
5.1. Maintain a record of the calibration process, including the date, calibration weights used, and calibration results (if applicable).
5.2. Document the details of each weighing operation conducted, including the date, sample identification, method used, calibration details (if applicable), and measured mass.
5.3. Retain the records in a secure and organized manner as per the laboratory’s document control procedures.
Abbreviations: (if applicable)
SOP: Standard Operating Procedure
QA: Quality Assurance
References: (if applicable)
Manufacturer’s operating instructions and technical specifications for the specific model of the weighing balance being used.
Revision History:
Version 1.0: [Date of initial creation]
Provides the initial version of the SOP for the