Hanuo FM-20 Compact Flake Ice Machine

Overview

The Hanuo FM-20 Compact Flake Ice Machine is an air-cooled, laboratory-grade flake ice generator engineered for consistent, low-temperature ice production in space-constrained environments. It employs a dual-screw extrusion freezing mechanism—where potable water is uniformly distributed across a refrigerated stainless-steel drum surface and rapidly frozen into thin layers, then mechanically scraped off by counter-rotating augers to form irregular, high-surface-area flake ice. This principle ensures minimal thermal shock to temperature-sensitive biological samples during handling and storage, making it particularly suitable for cold-chain maintenance in biosample preparation, reagent stabilization, and histological processing workflows. Unlike cube or nugget ice machines, the FM-20 produces soft, dry, and highly conformable flakes that pack efficiently around vials, tubes, and tissue specimens without mechanical damage or localized freezing gradients.

Key Features

• Compact footprint (330 × 480 × 605 mm) optimized for benchtop or under-bench installation in ISO Class 5–7 cleanrooms and BSL-2 laboratories.
• Full microprocessor-based control system with real-time status monitoring: operational mode, full ice bin detection, low-water alert, and fault diagnostics (e.g., evaporator frost buildup, fan failure, compressor overheat).
• Food-grade 304 stainless-steel exterior housing and internal ice-contact surfaces compliant with NSF/ANSI 12 standards for material safety and corrosion resistance.
• Automatic municipal water feed with integrated float valve and anti-drip solenoid cutoff—eliminates manual refilling and minimizes microbial ingress risk.
• R134a refrigerant system operating at sub-zero condensing temperatures (−10 °C to −15 °C evaporator surface), delivering stable ice output even in ambient lab conditions up to 32 °C.
• No external water drain required; condensed moisture is internally evaporated via heated air discharge—a critical advantage for mobile labs and laminar flow cabinet integration.

Sample Compatibility & Compliance

The FM-20 generates non-crystalline, low-density flake ice ideal for direct contact with primary biological specimens—including whole blood units, PBMC suspensions, cryovials containing stem cells, and fresh tissue biopsies—without inducing ice recrystallization or mechanical shear stress. Its design supports GLP-compliant cold chain documentation when paired with external temperature loggers (e.g., calibrated thermistors placed within ice-filled transport containers). While not certified to UL 61010-1 or IEC 61000-6-3 out-of-the-box, the unit meets CE-marked EMC and LVD requirements per EN 61000-6-2 and EN 61000-6-4, and its stainless-steel construction aligns with ISO 13485:2016 environmental control clauses for medical device manufacturing support labs.

Software & Data Management

The FM-20 operates as a standalone electromechanical appliance with no embedded software stack or network interface. All operational parameters—including runtime hours, cumulative ice output (estimated via cycle counting), and fault event timestamps—are displayed on a 4-digit LED panel and retained in non-volatile memory for up to 999 power cycles. For audit-trail integration in regulated environments (e.g., clinical trial sample processing labs), users may connect external data loggers to monitor ambient intake air temperature, compressor current draw, and bin temperature via optional PT100 probe ports (available upon request). The system supports 21 CFR Part 11–compatible electronic record generation only when interfaced with validated third-party laboratory information management systems (LIMS) using analog 4–20 mA or Modbus RTU signals (hardware adapter required).

Applications

• Cold preservation of enzymatic assays and PCR master mixes prior to thermal cycling.
• Temperature-controlled transport of diagnostic specimens between satellite collection sites and central pathology labs.
• Pre-chilling centrifuge rotors and microcentrifuge tubes before high-speed separation of plasma or exosomes.
• Supporting cryosectioning workflows by maintaining specimen block temperature stability during microtome sectioning.
• Providing rapid, on-demand cooling for calorimetry reference baths and dissolution testing apparatus in pharmaceutical QC labs.
• Backup cold source during temporary chiller system downtime in cell culture facilities.

FAQ

What is the typical ice density and particle size distribution of FM-20 flake ice?
Flake thickness ranges from 1.2 to 2.0 mm with lateral dimensions averaging 8–15 mm; bulk density is approximately 350–420 kg/m³ when loosely packed.
Can the FM-20 be installed inside a fume hood or biosafety cabinet?
No—it requires unobstructed ambient airflow for condenser heat dissipation and must be placed outside containment enclosures with ≥15 cm clearance on all sides.
Is deionized or distilled water compatible with the automatic feed system?
Yes, though prolonged use may accelerate scale formation on the evaporator drum; periodic citric acid descaling (every 3–6 months) is recommended.
Does the unit meet FDA requirements for ice used in pharmaceutical manufacturing?
It satisfies equipment qualification prerequisites (IQ/OQ) for ancillary cold utilities but requires site-specific validation per USP and Annex 1 for sterile compounding applications.
What maintenance intervals are specified for the dual-screw assembly?
Auger bearings require greasing every 1,500 operating hours; screw alignment verification is advised annually using manufacturer-supplied torque wrench and runout gauge.