Hengyi HY(DWC)-80 Cryogenic Impact Testing Bath (Powder-Coated)

Overview

The Hengyi HY(DWC)-80 Cryogenic Impact Testing Bath is a precision-engineered refrigerated cooling system designed specifically for standardized low-temperature Charpy and Izod impact testing of metallic and polymeric specimens. It operates on the principle of dual-compressor vapor-compression refrigeration combined with forced convection via internal circulation and thermal equilibrium control. This architecture ensures uniform temperature distribution throughout the cooling chamber—critical for achieving repeatable, standards-compliant impact energy measurements under sub-zero conditions. The bath is explicitly engineered to meet the stringent thermal stability and ramp-rate requirements defined in GB/T 229–2007, ASTM E23–02a (reapproved 2021), ISO 148-1:2016, ISO 83:1975, and EN 10045-1:1990. Its operational envelope—from ambient down to –80 °C—supports qualification testing across aerospace alloys, pipeline steels, cryogenic composites, and pressure vessel materials where ductile-to-brittle transition behavior must be rigorously characterized.

Key Features

• Dual independent Italian Aspera hermetic compressors for enhanced reliability, extended service life, and stable multi-zone cooling performance
• Thermal equilibrium-based temperature control with ±0.5 °C uniformity across the entire cold chamber volume (275 × 160 × 120 mm)
• Programmable digital timer (1–9999 minutes, 1-minute resolution) synchronized with temperature stabilization logic
• Stainless-steel sample basket assembly (3 units included), optimized for standard 10 × 10 × 55 mm Charpy V-notch specimens; capacity ≥60 samples per cycle
• High-efficiency axial-flow stirring motor (23 W) ensuring homogeneous coolant mixing and eliminating thermal stratification
• Powder-coated steel enclosure (910 × 510 × 920 mm) providing corrosion resistance, mechanical robustness, and lab-safe surface finish
• Compatible with anhydrous ethanol or certified non-freezing cryogenic fluids meeting IEC 60445 insulation and flash-point safety requirements

Sample Compatibility & Compliance

The HY(DWC)-80 accommodates standard impact test specimens per ISO 148-1, ASTM E23, and GB/T 229 geometries—including notched bars (V- and U-notch), subsize variants, and pre-cracked SE(B) specimens when used with auxiliary fixtures. All thermal performance metrics—including cooling rate profiles (1.5 °C/min from 25 °C to 0 °C; 0.5 °C/min from –40 °C to –80 °C), hold-time stability, and spatial uniformity—are validated against ISO/IEC 17025-accredited calibration protocols. The system supports full traceability for GLP and GMP-regulated environments: temperature logs are timestamped, user-identifiable, and exportable in CSV format—enabling alignment with FDA 21 CFR Part 11 audit-trail requirements when integrated with compliant LIMS platforms.

Software & Data Management

While the HY(DWC)-80 operates via embedded microcontroller-based hardware interface (no PC dependency), it features RS-232/RS-485 communication ports for integration into centralized lab automation networks. Optional firmware upgrade enables Modbus RTU protocol support, allowing real-time temperature streaming and remote setpoint adjustment via SCADA or custom Python/Matlab scripts. All temperature readings are acquired through a calibrated Pt100 sensor (IEC 60751 Class B) with NIST-traceable certificate supplied at commissioning. Internal data logging retains 30 days of continuous 1-second interval records—sufficient for post-test deviation analysis and root-cause investigation during QA audits.

Applications

• Ductile-to-brittle transition temperature (DBTT) determination in ferritic steels per ASTM E1921
• Low-temperature toughness validation for ASME Section VIII Div. 1 & 2 pressure equipment
• Material qualification for LNG storage tanks, Arctic offshore structures, and cryogenic piping systems
• Research-grade thermal aging studies involving polymer embrittlement below T_g
• Pre-test conditioning of weldment coupons prior to fracture mechanics testing (e.g., J-integral, CTOD)
• Supporting ISO 11359 dynamic mechanical analysis (DMA) sample equilibration protocols

FAQ

What refrigerants are compatible with the HY(DWC)-80 bath?

The system is designed for use with anhydrous ethanol (≥99.5% purity) or other non-aqueous, low-viscosity cryogenic heat-transfer fluids certified for –80 °C operation and non-reactive with stainless steel and aluminum components.
Is external chiller water connection required?

No—the HY(DWC)-80 is fully self-contained with air-cooled condensers; no chilled water loop or facility glycol supply is needed.
Can the unit maintain –80 °C continuously for >24 hours?

Yes, provided ambient laboratory temperature remains within 5–25 °C and relative humidity does not exceed 75% RH; continuous operation is supported by dual-compressor load-sharing logic.
Does the system include calibration documentation?

Each unit ships with a factory calibration report for the Pt100 sensor, referencing NIST-traceable standards, plus a performance verification certificate confirming compliance with GB/T 229–2007 thermal criteria.
What electrical infrastructure is required for installation?

A dedicated 220–240 V AC, 50 Hz, 16 A circuit with earth leakage protection (RCD/ELCB) is mandatory; voltage fluctuation must remain within ±5% of nominal.