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Use and Maintenance of Air Displacement Micropipettors

Learn about the use and care of air displacement micropipettors for accurate measurements. Understand fixed vs. adjustable volume pipettors, tip selection, calibration, validation, and more. Ensure precise liquid delivery with proper training and documentation. Stay informed on auditing and errors to maintain accuracy.

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Use and Maintenance of Air Displacement Micropipettors

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  1. Use and Maintenance of Air Displacement Micropipettors * Modified from Bob O’Brien New Hampshire Community Technical College And J. Pino CCRI

  2. Volumes • Range : Micropipettors are made for measuring 0.1l and 25mL BUT… • Typically used for 0.1L-1mL

  3. Fixed Volume vs. Adjustable Volume • Adjustable volume pipettors can be set to a desired volume but only work within a certain range. • Often they are color coded, or bear special names. (eg. “P20” or “L200”) • KNOW WHAT KIND YOU ARE USING AND USE THE RIGHT ONE! • Each fixed volume pipettor can only be used to dispense a particular volume

  4. Eppendorf Brand micropipette

  5. FinnPipette Brand Micropipette

  6. “Pipetman” • Rainin brand - now they call it “classic”, but they are extremely common!

  7. Digital Volume Adjustment

  8. Multichannel Pipette

  9. Pipet Tips • Not all tips are created equal! • Be sure to use the correct size • Be sure to use the correct brand. Some pipets are very “picky”. • If you use the wrong tip, it may not seal well and could affect the accuracy and precision of your measurements.

  10. Tip sizes vary Learn to estimate/judge volume by appearance in a given size tip. It will help you catch mistakes.

  11. Filter tips • If you need to keep out contamination. • Expensive so, use only when appropriate. • Ex of use: in PCR

  12. Defining Precision and Accuracy Pipette liquid delivery 2006Thermo Electron Corporation, Pipette guide

  13. Important Definitions • Calibration: The operations which assure that an instrument readings are accurate referenced to known standards. • Validation: Proving that a system (equipment, procedure, process, material) will yield expected results. • Test Equipment: Devices used during the calibration of instruments. These devices must be traceable to known standards.

  14. Training and Documentation • Ensure that all personnel involved with calibration are properly trained • Training records must be maintained • Documentation standards must be followed • Version/Revision control assures only current documents are deployed

  15. Auditing • Periodic audits verify that the calibration plan is being followed • Provides an opportunity to implement corrective action • Formal audit report documents audit process

  16. Example Operation SOP (10)

  17. Example Operation SOP (12)

  18. Example Calibration Work Form

  19. Inspection of Pipette

  20. Pipette calibration sop (4)

  21. Dual-Dye, Dual-Wavelength, Ratiometric Photometry Artel 2007

  22. Maximum Permissible Errors Gilson

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