DHS NX4R Pro Benchtop Refrigerated Centrifuge

Overview

The DHS NX4R Pro is a high-performance benchtop refrigerated centrifuge engineered for precision, reproducibility, and operational flexibility in demanding laboratory environments. Designed around a robust brushless frequency-controlled drive system and an advanced vapor-compression cooling architecture, it delivers stable temperature control across the full operating range of −20 °C to +40 °C—critical for preserving thermolabile biomolecules during high-speed separation. Its maximum rotational speed of 21,000 rpm and peak relative centrifugal force (RCF) of 33,500 × g enable rapid sedimentation of diverse particulates—from mammalian cells and subcellular organelles to bacterial pellets and viral particles—while maintaining sample integrity. The unit complies with IEC 61010-2-020 (safety requirements for centrifuges) and is manufactured under an ISO 13485-certified quality management system, supporting GLP/GMP-aligned workflows where traceability and process consistency are essential.

Key Features

• High-capacity configuration: Supports up to four 1000 mL bottles simultaneously, enabling batch processing of large-volume clinical or bioprocessing samples without compromising rotor balance or thermal stability.
• Precision speed control: PWM-based regulation ensures ±10 rpm speed accuracy across the full 300–21,000 rpm range; programmable acceleration and deceleration profiles (9-step ramp-up, 10-step coast-down) minimize resuspension and shear-induced damage.
• Intelligent rotor recognition: Integrated RFID or optical identification verifies rotor type, maximum speed rating, and calibration data upon insertion—preventing overspeed operation and enforcing safety interlocks.
• Energy-efficient refrigeration: Environmentally compliant non-CFC refrigerant system with rapid cooldown (<15 min from ambient to −20 °C at max load) and tight temperature uniformity (±1 °C across chamber volume).
• Full-touch HMI: 10-inch capacitive color display presents real-time parameters—including actual RCF, elapsed time, remaining time, temperature deviation, and imbalance status—with intuitive icon-driven navigation and multilingual UI support.
• Comprehensive safety architecture: Dual independent imbalance detection (electronic vibration sensing + mechanical load monitoring), overspeed cutoff, overtemperature shutdown, lid-lock verification, and automatic rotor lifetime tracking based on cumulative run hours and cycle count.

Sample Compatibility & Compliance

The NX4R Pro accommodates a wide array of rotor formats—including horizontal swing-out rotors (e.g., 4 × 1000 mL), fixed-angle rotors (e.g., 6 × 250 mL carbon-fiber rotor rated to 18,530 × g), and microplate carriers—supporting standard tube sizes from 0.2 mL PCR tubes to 1000 mL bottles. All rotors undergo ISO 21501-4 certified balancing and fatigue testing. The instrument meets CE marking requirements under Directive 2014/30/EU (EMC) and 2014/35/EU (LVD), and its design supports compliance with FDA 21 CFR Part 11 when paired with validated software modules that enforce electronic signatures, audit trails, and user-access controls. Routine maintenance logs and calibration records can be exported in CSV or PDF format for regulatory submissions.

Software & Data Management

The embedded firmware supports secure data handling through timestamped, user-logged operation records—including start/stop times, selected program ID, rotor ID, temperature setpoint, actual RCF, and fault codes. Up to 100 user-defined programs may be stored locally, each containing up to 10 sequential steps with independent speed, time, temperature, and acceleration/deceleration settings. Optional USB export enables transfer of run history and event logs to LIMS or ELN platforms. Firmware updates are delivered via encrypted firmware packages with SHA-256 signature verification to ensure integrity and prevent unauthorized modification.

Applications

This centrifuge serves core functions across clinical diagnostics, biopharmaceutical development, academic research, and food safety testing. Typical use cases include: isolation of exosomes and extracellular vesicles from plasma or cell culture supernatants; clarification of fermentation broths prior to chromatographic purification; preparation of platelet-rich plasma (PRP) and bone marrow aspirates; density gradient separations (e.g., Ficoll-Paque™ or Percoll®); and high-yield harvesting of microbial biomass (E. coli, yeast, baculovirus). Its −20 °C capability makes it suitable for cryoprecipitate recovery and cold-active enzyme fractionation.

FAQ

What is the maximum allowable imbalance tolerance for safe operation?
The NX4R Pro detects imbalances as low as 5 g·cm and halts rotation within 0.8 seconds if imbalance exceeds 25 g·cm—well below ISO 15841 limits for Class II centrifuges.
Can the centrifuge operate continuously for extended periods?
Yes—thermal management and brushless motor design permit uninterrupted runs up to 99 hours 59 minutes, with automatic duty-cycle monitoring to prevent overheating.
Is rotor lifetime tracked automatically?
Yes—each rotor’s serial number is registered during first use; cumulative runtime, max speed history, and thermal cycles are logged and displayed to inform preventive maintenance scheduling.
Does the system support audit trail generation for regulated environments?
When configured with optional validation-ready firmware, all user actions, parameter changes, and error events are recorded with immutable timestamps and operator IDs—fully compliant with ALCOA+ data integrity principles.
What certifications apply to the refrigeration system?
The compressor and refrigerant circuit comply with EN 378-1:2016 for refrigerating systems and heat pumps, and use R-449A—a low-GWP (global warming potential) hydrofluoroolefin blend approved under EU F-Gas Regulation No. 517/2014.