Equipment Operation & Maintenance
Guides
Biosafety Cabinet Cleaning and Decontamination Procedures
How to clean a biosafety cabinet between uses versus when it needs full gas decontamination — surface disinfection technique, disinfectant selection, and the formaldehyde/vaporized hydrogen peroxide fumigation process under NSF/ANSI 49 Annex G.
Autoclave Validation: Using Biological and Chemical Indicators
How to validate that an autoclave cycle actually achieved sterility using physical monitoring, chemical indicators (ISO 11140-1 Classes 1-6), the Bowie-Dick test, and biological indicators (Geobacillus stearothermophilus spore testing) — including recommended testing frequency and how to respond to a failed test.
Milli-Q Water Purification System Maintenance
How Milli-Q lab water purification systems work, what resistivity and TOC readings mean, and a practical maintenance schedule covering cartridge replacement, UV lamp service, sanitization, and troubleshooting.
Microplate Reader Calibration and Maintenance Guide
How to verify a microplate reader’s photometric accuracy, wavelength accuracy, linearity, well-to-well precision, and (for multimode readers) fluorescence and luminescence detection, using NIST-traceable reference plates.
How to Operate a Lab Autoclave: Cycle Types Explained (Gravity, Pre-Vacuum, Liquid)
How gravity displacement, pre-vacuum, and liquid autoclave cycles each remove air and sterilize differently, and how to choose the right cycle for glassware, wrapped instruments, and liquids.
How to Properly Use a Biosafety Cabinet: Airflow, Sash Height, and Technique
Operator technique for using a biosafety cabinet correctly between certifications: certified sash height, front-grille clearance, hand movement, loading order, and what never to bring inside.
Autoclave Troubleshooting: Common Problems and Fixes
A practical, symptom-first guide to diagnosing and fixing the most common autoclave problems: failure to reach pressure or temperature, wet loads, door and gasket issues, aborted cycles and error codes, and failed biological or chemical indicators.
CO2 Incubator Calibration and Temperature Uniformity Mapping
How to calibrate a CO2 incubator and verify it: CO2 sensor types (TC vs IR), calibration-gas and chemical reference methods, NIST-traceable temperature checks, and how to run a temperature uniformity mapping study.
Fume Hood Sash Height and Safe Operating Practices
How sash height, CAV vs. VAV airflow, and everyday operating habits keep a chemical fume hood’s real-world containment consistent with what it was certified at.
Biosafety Cabinet Certification: What NSF/ANSI 49 Testing Involves
What NSF/ANSI 49 field certification actually tests on a biosafety cabinet, how often it’s required, who’s qualified to perform it, and how to read a pass/fail report.
Analytical Balance Calibration and Proper Weighing Technique
A practical guide to analytical balance calibration: the repeatability, eccentricity, and linearity tests behind a real calibration, ASTM E617/OIML R111 test-weight traceability, USP <41>/<1251> requirements, calibration frequency, and proper weighing technique.
Spectrophotometer Calibration: Wavelength and Photometric Accuracy Checks
How to verify a UV-Vis spectrophotometer’s wavelength and photometric accuracy using NIST-traceable reference materials and ASTM E275, including a step-by-step procedure, calibration frequency, and what to document.
RCF vs. RPM: How to Convert and Why It Matters for Centrifugation
RCF and RPM measure different things — RPM is rotor speed, RCF is the actual force on your sample. Learn the conversion formula, rotor radius, and worked examples.
Centrifuge Rotor Balancing: Safety Best Practices
How to balance a centrifuge correctly, what to check before every run, and how to inspect and retire rotors before fatigue or corrosion causes a failure.
Class I vs. II vs. III Biosafety Cabinets: Operational Differences for Everyday Lab Use
Class I, II, and III biosafety cabinets differ in how much they protect the worker, the sample, and the room. This guide breaks down each class, the Class II subtypes (A1, A2, B1, B2, C1), which class matches which biosafety level, and the everyday habits that keep a cabinet’s containment intact.
pH Meter Calibration: Buffer Selection and Best Practices
How to calibrate a pH meter correctly: choosing and bracketing buffer solutions, two- vs three-point calibration, reading slope/offset diagnostics, temperature compensation, and electrode storage practices that keep calibration accurate.
