YANRUN BI-20 Biological Inverted Microscope

Overview

The YANRUN BI-20 Biological Inverted Microscope is engineered for routine and advanced life science applications requiring stable, high-contrast observation of live cells, tissue cultures, and adherent specimens in standard Petri dishes, flasks, and multi-well plates. Its inverted optical architecture positions the objective lenses beneath the specimen stage and the condenser above—enabling unobstructed access to culture vessels while maintaining optimal working distance and ergonomic sample manipulation. The system employs a finite-conjugate, achromatic optical design compliant with ISO 10934-1 standards for microscope performance evaluation. Core imaging fidelity derives from matched wide-field eyepieces and precision-ground achromatic or semi-plan achromatic objectives, minimizing chromatic aberration across the visible spectrum (400–700 nm) and delivering uniform resolution up to 1000× total magnification under oil immersion. The halogen-based Köhler illumination system supports quantitative brightness control and spectral stability essential for time-lapse documentation and comparative morphological analysis.

Key Features

• Inverted configuration optimized for upright handling of liquid-containing cultureware without interference from objective lens proximity
• Binocular viewing head inclined at 30°, accommodating extended daily use with reduced cervical strain
• Coaxial coarse/fine focusing mechanism featuring calibrated 2 µm fine-focus graduations, user-adjustable coarse-drive tension, mechanical upper limit stop, and instant-lock function for vibration-resistant positioning
• Four-position inward-rolling ball-bearing nosepiece ensuring precise rotational alignment and long-term repeatability of objective engagement
• Dual-layer mechanical stage (160 × 140 mm) with 75 × 50 mm travel range, engraved vernier scales, and low-profile design compatible with incubator chambers
• Abbe condenser (N.A. 1.25) with centering screws, vertical height adjustment, and integrated filter holder for blue filter and ground-glass diffuser—supporting both brightfield and basic contrast enhancement
• 6 V / 20 W halogen illuminator with linear dimming circuitry, providing stable color temperature (~3200 K) and minimal thermal drift during prolonged imaging sessions

Sample Compatibility & Compliance

The BI-20 accommodates standard cell culture formats including 35 mm, 60 mm, and 100 mm Petri dishes; T25, T75, and T175 flasks; and 6-, 12-, 24-, 48-, and 96-well plates. Its minimum working distance at 40× (0.66 mm) and 100× oil (0.36 mm) permits direct observation through bottom-glass surfaces up to 1.2 mm thickness without correction collar adjustment. The optical train meets ISO 8578:2017 (microscope mechanical tube length and parfocal distance tolerances) and conforms to CE marking requirements for laboratory equipment safety (2014/35/EU Low Voltage Directive and 2012/19/EU EMC Directive). While not certified to GLP or FDA 21 CFR Part 11 out-of-the-box, the platform supports audit-ready documentation when paired with optional USB/VIDEO digital capture and timestamped image management software.

Software & Data Management

The BI-20 integrates seamlessly with third-party imaging platforms via its trinocular port (optional), supporting USB 2.0 and analog VIDEO output for real-time streaming to Windows/macOS/Linux-based acquisition software (e.g., NIS-Elements, CellSens, or open-source MicroManager). Image metadata—including objective ID, magnification, exposure time, and date/time stamp—is embedded into TIFF or JPEG headers upon capture. When used with YANRUN’s optional LED illumination module (9 V / 500 mA, dual-input 110 V / 230 V), power supply logs can be archived alongside image sets for environmental traceability in QC/QA workflows.

Applications

• Monitoring confluence, morphology, and motility of mammalian, insect, and stem cell lines in vitro
• Assessing transfection efficiency and reporter gene expression in transiently transfected cultures
• Performing manual cell counting and viability assays using trypan blue or AO/PI staining
• Conducting phase contrast observations of unstained, low-contrast specimens such as fibroblasts, neurons, and organoids
• Supporting basic pathology training, microbiology education, and pharmaceutical cytotoxicity screening
• Serving as a foundational platform for add-on modalities including polarized light imaging and darkfield microscopy

FAQ

Is the BI-20 suitable for oil immersion imaging?
Yes—the 100×/1.25 NA oil-immersion objective is included as standard, with a working distance of 0.36 mm and spring-loaded mounting to prevent cover-slip damage.
Can the microscope be upgraded to infinity-corrected optics?
Yes—YANRUN offers an optional infinity-corrected optical pathway kit, including matched objectives, tube lens, and trinocular head, enabling compatibility with modern fluorescence filter cubes and laser coupling.
Does the BI-20 support phase contrast without hardware modification?
No—phase contrast requires optional PH-I or PH-II turret condensers and corresponding PHP-series objectives; these are available as factory-configured bundles.
What is the maximum recommended duration for continuous halogen illumination?
For thermal stability and lamp longevity, continuous operation should not exceed 8 hours per session; halogen bulb lifetime is rated at ≥1000 hours under regulated dimming conditions.
Is technical documentation available in English with calibration procedures?
Yes—English-language user manuals, optical alignment guides, and ISO-compliant verification checklists are provided with each unit, including step-by-step collimation and centering protocols for Abbe condenser and objectives.