Herxi TDL8M Benchtop Low-Speed High-Capacity Refrigerated Centrifuge

Overview

The Herxi TDL8M is a benchtop-format, low-speed, high-capacity refrigerated centrifuge engineered for reproducible, temperature-controlled separation of biological and clinical samples requiring gentle yet robust sedimentation forces. Operating on the principle of sedimentation under controlled gravitational acceleration (RCF), the TDL8M delivers precise thermal regulation across its full operational range (−20 °C to +40 °C), ensuring sample integrity during prolonged runs—critical for isolating intact cells, organelles, precipitated proteins, serum components, and large-volume blood derivatives. Unlike ultra-high-speed instruments, its design prioritizes stability, safety, and capacity over extreme rotational velocity, making it ideal for routine preparative workflows in core labs, blood banks, quality control units, and academic research facilities where batch processing of liters-scale samples is routine.

Key Features

• High-torque brushless frequency-controlled motor ensures smooth acceleration, consistent speed maintenance (±50 rpm), and extended service life with minimal maintenance.
• True-color 4.3-inch TFT touchscreen interface with dual-mode control (touch + physical keys) enables intuitive programming, real-time parameter monitoring, and rapid protocol recall.
• Refrigeration system employs environmentally compliant CFC-free compressors, delivering stable temperature control with ±1 °C accuracy—even during continuous operation up to 99 hours 59 minutes.
• Full stainless-steel centrifuge chamber and heavy-duty structural frame provide mechanical rigidity, corrosion resistance, and long-term dimensional stability under cyclic thermal and mechanical loads.
• Electromechanical door lock mechanism operates silently and reliably, meeting IEC 61010-2-020 safety standards for centrifuge interlocks and emergency stop response.
• 20 pre-programmable run protocols support customizable combinations of speed, time, temperature, acceleration, and deceleration profiles—enabling standardized SOP execution across user groups.
• Acoustic optimization achieves ≤60 dB(A) noise emission at 1 m distance, supporting installation in shared laboratory environments without dedicated acoustic enclosures.

Sample Compatibility & Compliance

The TDL8M accommodates a broad spectrum of primary and secondary sample containers—including 5–500 mL conical tubes, vacuum blood collection tubes (e.g., EDTA, heparin, serum separator), standard microcentrifuge tubes (0.2–15 mL), and 96-well microplates—via interchangeable rotors. Its horizontal rotor configuration supports high-volume processing (up to 4 × 500 mL), while angular and microplate rotors extend utility to smaller-volume assays. The instrument is designed and validated for use in environments adhering to Good Laboratory Practice (GLP) and ISO/IEC 17025:2017 requirements. While not FDA 21 CFR Part 11–certified out-of-the-box, its programmable logging function (including timestamped RCF, temperature, duration, and rotor ID) provides foundational data traceability suitable for internal audit preparation and regulatory readiness.

Software & Data Management

The embedded control firmware records all active run parameters—including start/stop timestamps, setpoints, actual RCF, chamber temperature history, and rotor identification—in non-volatile memory. No external PC or proprietary software is required for basic operation or data retrieval; however, USB export functionality allows periodic backup of run logs in CSV format for integration into LIMS or ELN systems. All stored protocols retain full parameter fidelity, enabling seamless re-execution without manual recalibration. Firmware updates are delivered via secure USB media and include version-controlled release notes aligned with ISO 13485 design change documentation practices.

Applications

• Blood banking: Separation of packed red blood cells, platelet-rich plasma (PRP), and buffy coat from whole blood in 500 mL bags or multiple tubes.
• Clinical diagnostics: Routine serum/plasma preparation from venous samples using vacuum tube rotors with integrated brake profiles to prevent clot disruption.
• Food safety testing: Clarification of homogenized food extracts prior to microbial enumeration or toxin analysis (e.g., ELISA, HPLC).
• Agricultural research: Isolation of starch granules, chloroplasts, or fungal spores from plant tissue lysates.
• Biopharmaceutical QC: Harvesting mammalian or bacterial cell pellets from bioreactor harvests (≤500 mL batches) under controlled temperature conditions.
• Environmental microbiology: Concentration of waterborne pathogens (e.g., Legionella, protozoan cysts) from large-volume filtration eluates.

FAQ

What is the maximum RCF achievable with the 4 × 500 mL horizontal rotor?

The 4 × 500 mL rotor reaches a maximum RCF of 3580 ×g at 4000 rpm.
Does the TDL8M support automatic rotor recognition?

No—rotor identification is manually selected during protocol setup to ensure correct RCF calculation and safety interlock activation.
Can the centrifuge maintain −20 °C while operating at maximum speed?

Yes; the CFC-free refrigeration system is rated for full thermal load at all speeds within the specified temperature range.
Is remote monitoring or network connectivity available?

The base model does not include Ethernet or Wi-Fi interfaces; data export is limited to USB storage devices.
What safety certifications does the TDL8M carry?

It complies with IEC 61010-1 (Safety Requirements for Electrical Equipment) and IEC 61010-2-020 (Particular Requirements for Centrifuges), with CE marking for the European Economic Area.