SOP Title: Operation and Calibration of Vernier Calliper
- Objective:
To lay down the procedure for Operation and Calibration of Vernier Calliper.
- Scope:
This SOP is applicable for Operation, Cleaning and Calibration of Vernier Calliper located in Quality Control Laboratory.
- Responsibility:
- Quality Control: To prepare and review the SOP. To follow the procedures laid down for Operation and Calibration of Vernier Calliper as per this SOP.
- Quality Assurance Department: To review and approve the SOP and Annexures.
- Accountability:
Head Quality Control Department, Head Quality Assurance Department.
- Procedure:
| 5.1 | Safety Precautions/Instructions: | |
| 5.1.1 | Wear personal protective equipment’s such as hand gloves during operation of vernier calliper. | |
| 5.2 | Operation: | |
| 5.2.1 | Introduction to keys:
“ON/OFF” (green colour button) → To ON/OFF the instrument. “in/mm” (white colour button) → display reading will change from millimetre to inch. “ZERO” (yellow colour button) → To reset the instrument to zero reading. “INIT” (Black colour button) → To initiate instrument at zero level from any reading. |
|
| 5.2.2 | Measuring range of the instrument is from 0 to 150 mm or 0 to 6 inch.
Resolution – 0.0005 in./0.01 mm. Instrumental error – ±0.0015 in./±0.03 mm. |
|
| 5.2.3 | Vernier calliper can be used to take measurement in mm or inch depending upon the requirement. | |
| 5.2.4 | Loose the top screw slightly so as to down thumb wheel will move smoothly. | |
| 5.2.5 | Before putting ON the instrument, ensure that both upper and lower grooves of Vernier calliper should touch each other. | |
| 5.2.6 | First press the ON/OFF button to ON the instrument, display will show “0.0000 in” if the instrument is set for inch OR display will show ”0.00mm” if the instrument is set for mm. | |
| 5.2.7 | After putting ON instrument, if display is not showing zero reading, then press the “ZERO” button to set zero reading. | |
| 5.2.8 | For external measurement such as samples, use the lower side grooves of the instrument. | |
| 5.2.9 | Carefully insert the sample between lower side of two grooves of vernier calliper and hold firmly such that sample should not fall down. | |
| 5.2.10 | Then note down the display reading. | |
| 5.2.11 | For internal measurement use the top grooves of the instrument. | |
| 5.2.12 | Carefully insert the sample into the top grooves of vernier calliper and hold firmly such that sample should not fall down. | |
| 5.2.13 | Then note down the display reading. | |
| 5.2.14 | After testing is completed, remove the sample from instrument; bring the grooves to initial position by moving the thumb wheel and press the “ZERO” button to set zero reading. | |
| 5.2.15 | Press the ON/OFF button to OFF the instrument. | |
| 5.3 | Calibration Procedure: | |
| Frequency: Once in a year by external agency | ||
| 5.3.1 | Calibration is carried out by external agency as per SOP “Calibration of Instruments and Equipments”. | |
| 5.3.2 | Refer Annexure for calibration test to be performed and acceptance criteria. | |
| 5.3.3 | Generate the A. R. No. on the “Instrument/Equipment Calibration Register” as per SOP and give requisition to QA department for calibration formats of instruments/equipments on the due date of calibration. | |
| 5.3.4 | For issuance of calibration report refer SOP “Control of documents, Preparation, Approval, Issuance and Maintenance. | |
| 5.3.5 | Update “Annual Calibration Schedule” and “Monthly Calibration Schedule” as per SOP “Calibration of Instruments and Equipments”. | |
| 5.3.6 | If any breakdown occurs, follow procedure as per SOP “Calibration of Instruments and Equipments”. | |
- Definitions / Abbreviations:
- Definitions:
- Breakdown: Any activity leading to operation of instrument/equipment other than the set parameters or unusual sound or vibration observed in the instrument/equipment.
- Calibration: Tests performed to ensure that the instrument/equipment is functioning as per set parameters. These tests are performed as per predefined frequency and also after any major repair or replacement of parts.
- Abbreviations:
| Abbreviation | Expansion |
| SOP | Standard Operating Procedure |
| QC | Quality Control |
| QA | Quality Assurance |
| A. R. No | Analytical Reference Number |
| No. | Number |
| mm | millimetre |
*Note – Ready to use SOP available in “DOWNLOAD” Section.