The Great Wall VT-5000HC Cryogenic Trap

Overview

The Great Wall VT-5000HC Cryogenic Trap is an engineered solution for vacuum system protection in laboratory-scale freeze drying, solvent removal, and low-pressure thermal processing applications. It operates on the principle of cryogenic condensation—utilizing a closed-cycle refrigeration system to maintain a precisely controlled cold surface (down to −40 °C no-load) that captures volatile vapors—including water, ethanol, acetone, acetic acid, and other low-boiling-point solvents—before they reach the primary vacuum pump. This not only extends pump service life and reduces maintenance frequency but also mitigates environmental emissions and ensures compliance with occupational health and safety requirements for lab exhaust management. Designed for integration with vacuum ovens, rotary evaporators, and battery electrode drying lines, the VT-5000HC supports both continuous and batch-mode operation under stable thermal load conditions.

Key Features

• Two operational modes: direct trapping via the stainless steel chamber (AISI 304), or removable borosilicate glass 3.3 condenser flasks for chemically aggressive or high-purity applications;
• Digital temperature monitoring with Pt100 sensor and intuitive setpoint interface, enabling real-time thermal feedback and synchronized vacuum activation;
• Multi-layer safety architecture including compressor delay start, overcurrent cutoff, and overtemperature shutdown—fully compliant with IEC 61000-6-2/6-4 EMC and low-voltage directive requirements;
• Optimized refrigeration circuit using R404A refrigerant, delivering scalable cooling capacity from 920 W at −10 °C to 40 W at −40 °C to match varying vapor load profiles;
• Modular vacuum interface with standardized 12 mm OD flexible hose connection, compatible with common vacuum tubing standards (ISO-KF 16/25, NW16);
• Robust mechanical construction: powder-coated steel chassis, reinforced insulation, and vibration-dampened compressor mounting for long-term stability in shared lab environments.

Sample Compatibility & Compliance

The VT-5000HC accommodates diverse sample matrices across pharmaceutical, materials science, and electrochemical research domains. Its 304 stainless steel chamber is validated for aqueous and ethanol-based systems, while the included trio of borosilicate glass 3.3 condenser flasks (Ø50 mm × 300 mm) withstand exposure to hydrochloric acid, nitric acid, DMF, THF, and NMP—enabling use in cathode/anode slurry drying for lithium-ion battery manufacturing. All wetted surfaces meet USP Class VI biocompatibility criteria for non-leaching performance. The unit conforms to ISO 14001 environmental management principles and supports GLP-compliant documentation when paired with external data loggers (e.g., calibrated USB thermocouple recorders). No internal oil-lubricated components are present, eliminating risk of hydrocarbon contamination in ultra-high-vacuum or analytical-grade workflows.

Software & Data Management

While the VT-5000HC operates as a standalone hardware device without embedded firmware or proprietary software, its digital temperature display outputs analog voltage signals (0–5 V DC) corresponding to Pt100 readings—facilitating integration with third-party SCADA systems, LabVIEW-based control platforms, or programmable logic controllers (PLCs). Optional RS-485 Modbus RTU output module (sold separately) enables remote parameter monitoring and alarm relay triggering. All temperature setpoints and status indicators are retained through power cycling. Audit trail functionality is achievable via external time-stamped logging of vacuum pressure (via connected Pirani or capacitance manometer) alongside trap temperature—supporting FDA 21 CFR Part 11 readiness when implemented within validated electronic lab notebook (ELN) ecosystems.

Applications

• Pre-condensation stage in lyophilization cycles to prevent ice migration into vacuum pumps during primary drying;
• Solvent recovery in rotary evaporation of heat-sensitive APIs where methanol or dichloromethane must be captured at sub-zero temperatures;
• Moisture and residual solvent removal from lithium cobalt oxide (LCO) and silicon-carbon composite electrodes prior to cell assembly;
• Cryogenic pre-trapping in high-vacuum metalorganic chemical vapor deposition (MOCVD) precursor lines;
• Environmental testing chambers requiring dew point suppression below −30 °C to simulate arctic storage conditions;
• Gas purification in glovebox antechambers where trace H₂O and O₂ must be removed prior to inert-atmosphere transfer.

FAQ

Can the VT-5000HC be used continuously for >8 hours without performance degradation?
Yes—its refrigeration system is rated for continuous duty cycle at ambient temperatures ≤30 °C and relative humidity ≤60%. Compressor thermal management includes dual-stage oil cooling and phase-separation design to sustain stable −40 °C chamber temperature under sustained 20–30 g/h water vapor load.
Is the borosilicate glass condenser flask autoclavable?
No—while borosilicate glass 3.3 resists thermal shock up to 150 °C, autoclaving involves saturated steam at 121 °C and elevated pressure, which exceeds mechanical design limits. Cleaning is recommended via ultrasonic bath with dilute nitric acid or isopropanol followed by nitrogen purge.
Does the unit include vacuum gauge or pressure control capability?
No—the VT-5000HC functions solely as a passive cold trap. Integration with external vacuum gauges (e.g., MKS Baratron, Pfeiffer TPG300) and solenoid-controlled vacuum valves is required for automated pressure regulation.
What is the expected service interval for refrigerant recharge?
Under normal operation and proper installation (level mounting, adequate ventilation, no refrigerant line kinking), the sealed R404A circuit requires no scheduled recharge over a 10-year service life. Leak detection ports are accessible for certified HVAC-R technicians if pressure anomalies occur.
Can the trap operate in a nitrogen-purged enclosure?
Yes—its electrical components meet IP20 ingress protection rating and are compatible with inert atmosphere enclosures. However, ambient heat dissipation must be ensured via forced convection or heat exchanger coupling, as nitrogen has lower specific heat than air.