Herxi DD5M Automatic Cap-Removal Centrifuge

Overview

The Herxi DD5M Automatic Cap-Removal Centrifuge is a floor-standing, microprocessor-controlled low-speed centrifuge engineered specifically for high-throughput clinical laboratory workflows involving vacuum blood collection tubes. Unlike conventional centrifuges requiring manual cap removal prior to separation, the DD5M integrates synchronized mechanical cap ejection with centrifugal sedimentation—enabling fully automated, sequential processing of up to 148 standard-length (100 mm) or 124 short-length (75 mm) evacuated tubes per run. Its operational principle combines precise rotational dynamics (up to 4000 rpm, generating 3580 ×g) with pneumatically assisted, servo-guided cap displacement—minimizing operator intervention while maintaining sample integrity and preventing hemolysis or re-suspension of separated phases. Designed for routine serum/plasma isolation in hospital core labs, blood banks, and reference testing facilities, the DD5M operates without active refrigeration, relying on thermally stable motor architecture and passive heat dissipation to ensure consistent performance during extended duty cycles.

Key Features

• Integrated cap-removal mechanism achieving ≥97% success rate across two standardized tube lengths (75 mm and 100 mm), validated under ISO 13485-compliant production protocols
• High-torque brushless AC/DC inverter motor paired with Infineon intelligent drive modules and ELM327-based control firmware for stable speed regulation (±50 rpm accuracy) and ultra-low acoustic emission (≤65 dB[A])
• Dual-mode human interface: 7-inch TFT-LCD touchscreen with physical shortcut keys; real-time display of setpoints, actual RCF, elapsed time, and dynamic curves (speed ramp, cumulative centrifugation integral, ambient temperature trend)
• 20 programmable user protocols with editable acceleration/deceleration profiles (10-step granularity); parameter modification possible mid-run without rotor stoppage
• Triple-stage damping system comprising rubber-isolated base mounts, asymmetric counterweight compensation, and composite polymer suspension bushings—reducing vibration transmission by >82% versus legacy mechanical dampers
• Enhanced safety architecture: 304 stainless steel centrifuge chamber, three-layer reinforced steel front panel, auto-engaging electromagnetic door lock with torque-sensing latch verification, and comprehensive fault detection (imbalance, overspeed, undervoltage, overtemperature, phase loss)
• Modular mobility design: integrated dual-locking casters with height-adjustable leveling feet for rapid deployment and ISO/IEC 17025-aligned lab reconfiguration

Sample Compatibility & Compliance

The DD5M is validated for use with all major globally standardized vacuum blood collection tubes—including BD Vacutainer®, Greiner Bio-One Vacuette®, and Sarstedt Monovette®—in both 13 × 75 mm and 13 × 100 mm formats. It supports separation of serum, plasma, and whole blood derivatives per CLSI GP44-A6 and ISO 15189:2022 requirements for preanalytical phase standardization. Device manufacturing and quality management systems comply with ISO 13485:2016 and are registered under China’s National Medical Products Administration (NMPA, formerly CFDA) as Class II in vitro diagnostic ancillary equipment. All electrical safety and electromagnetic compatibility testing conforms to IEC 61010-1:2010 and IEC 61326-1:2012 standards. No regulatory claim is made for use with infectious or biohazardous specimens beyond standard BSL-2 containment practices.

Software & Data Management

The embedded control firmware supports audit-trail-enabled operation logs (timestamped start/stop, rotor ID, speed profile, cap-ejection status per rack position) stored locally in non-volatile memory. While the DD5M does not feature network connectivity or LIMS integration out-of-the-box, exported CSV-formatted logs can be imported into laboratory information systems compliant with HL7 v2.x or ASTM E1384 data exchange frameworks. Multilingual UI (English, Chinese, Russian, Portuguese) facilitates cross-border deployment in APAC, EMEA, and LATAM clinical networks. Firmware updates are performed via secure USB 2.0 interface with SHA-256 signature verification—ensuring traceability and version control aligned with FDA 21 CFR Part 11 electronic record principles.

Applications

• Routine serum separation for clinical chemistry, immunoassay, and coagulation testing
• Plasma preparation for therapeutic apheresis support and biobanking workflows
• Whole blood fractionation in blood donation centers prior to component processing
• Pre-analytical automation in high-volume outpatient laboratories handling >1,000 daily specimens
• Quality assurance validation of tube fill volume and clot formation kinetics
• Research applications requiring reproducible phase separation of peripheral blood mononuclear cells (PBMCs) prior to density gradient centrifugation

FAQ

Does the DD5M support refrigerated operation?
No—the DD5M is an ambient-temperature centrifuge. It lacks active cooling but maintains thermal stability through optimized motor winding design and aluminum alloy heat sinks, suitable for environments maintained at 15–30°C per ISO 20387:2018 biobanking guidelines.
Can the cap-removal function be disabled for non-capped tubes?
Yes—cap ejection is software-gated and configurable per protocol; users may define “no-cap” runs for centrifugation of capped microtubes, conical tubes, or other non-evacuated vessels using compatible horizontal rotors.
Is rotor balancing required before each run?
The DD5M incorporates automatic imbalance detection and adaptive load compensation; however, manual symmetry verification remains recommended per CLSI EP25-A2 to ensure long-term bearing longevity and optimal RCF delivery.
What maintenance intervals are specified for the cap-removal actuator?
The pneumatic cap-ejector module requires lubrication-free operation and is rated for ≥50,000 cycles; routine inspection of O-ring integrity and alignment pins is advised every 6 months or after 1,000 runs, per the manufacturer’s PM checklist.
Are third-party rotors or adapters supported?
Only Herxi-certified horizontal swing-out rotors (e.g., HR-148, HR-124) and tube carriers are approved for use; substitution voids ISO 13485 traceability and invalidates NMPA registration compliance.