Zhengzhou Great Wall VT-40x Water Vapor Trap

Overview

The Zhengzhou Great Wall VT-40x Water Vapor Trap is a purpose-engineered cryogenic condensation unit designed to intercept and immobilize water vapor, solvents, and volatile contaminants generated during vacuum drying, rotary evaporation, freeze-drying, and low-pressure concentration processes. Operating on the principle of direct-contact condensation, the VT-40x achieves a no-load minimum temperature of −40 °C using a hermetically sealed R404A refrigeration system. Unlike passive cold traps relying solely on liquid nitrogen or dry ice, this unit delivers stable, programmable, and maintenance-free sub-zero thermal performance—enabling consistent vacuum integrity and extending service life of downstream vacuum pumps (e.g., oil-sealed rotary vane or diaphragm pumps). Its integration into vacuum lines reduces backstreaming, minimizes pump oil contamination, and mitigates environmental release of hazardous vapors—including ethanol, acetone, ethyl acetate, and aqueous volatiles—supporting compliance with occupational health and laboratory emission control guidelines.

Key Features

• Direct-contact cooling architecture ensures rapid thermal equilibration and high condensation efficiency across water, alcohol, and moderately aggressive organic solvent systems.
• Dual configuration options: stainless steel trap chamber (AISI 304 / 06Cr19Ni10) for aqueous and ethanol-based applications; optional borosilicate glass condensing flask for compatibility with acidic or highly polar organic media.
• Digital temperature monitoring via Pt100 sensor with 0.1 °C resolution and real-time display—critical for process validation and endpoint determination in moisture-sensitive drying cycles.
• Intelligent safety system includes compressor delay start (to prevent voltage surge), overcurrent protection, overtemperature cutoff, and high-pressure shutdown—ensuring operational reliability under variable load conditions.
• KF25 vacuum flange interface enables standardized, leak-tight integration with common lab vacuum manifolds, lyophilizers, and concentrators without adapter requirements.
• Compact footprint (388 × 454 × 780 mm) and integrated casters support flexible placement in fume hoods, cleanroom vestibules, or QC laboratories adhering to ISO 14644-1 Class 8 spatial constraints.

Sample Compatibility & Compliance

The VT-40x accommodates diverse sample matrices by virtue of its dual-material design strategy. The 304 stainless steel trap chamber (Ø160 × 250 mm) resists corrosion from water, buffer solutions, and ethanol/water mixtures—making it suitable for pharmaceutical lyophilization pre-chilling, battery electrode drying (per GB/T 36276–2018), and capacitor moisture removal protocols. The optional glass cold finger assembly extends compatibility to hydrochloric acid vapors, acetic anhydride, THF, and other solvents incompatible with stainless surfaces. While not certified to UL/CE for hazardous location use, the unit conforms to IEC 61010-1:2010 safety standards for electrical equipment used in laboratory environments. Its closed-loop refrigeration design supports institutional EHS policies aligned with ISO 14001 environmental management frameworks.

Software & Data Management

The VT-40x operates as a standalone analog-controlled instrument with no embedded microprocessor or digital communication interface (e.g., RS-232, USB, or Ethernet). Temperature setpoint and status are managed locally via front-panel controls and LED display. For labs requiring audit-ready documentation, external data loggers (e.g., Omega OM-DAQPRO-5300 series) may be connected to the Pt100 output terminals to record time-stamped temperature profiles—facilitating GLP-compliant batch records per FDA 21 CFR Part 11 when paired with validated software and electronic signature workflows. No firmware updates or cloud connectivity are provided or supported.

Applications

• Vacuum drying of lithium-ion battery cathode/anode coatings (NMC, LFP, graphite) prior to cell assembly—preventing residual moisture-induced SEI instability.
• Pre-freezing stage in benchtop freeze dryers (e.g., Labconco FreeZone series) to enhance primary drying rate and product morphology consistency.
• Solvent recovery during rotary evaporation of natural product extracts—reducing VOC emissions and enabling partial re-use of condensed fractions.
• Protection of turbomolecular pumps in high-vacuum deposition systems (e.g., e-beam evaporation) against water vapor ingress during chamber venting cycles.
• Moisture scavenging in glovebox antechambers during material transfer of hygroscopic compounds (e.g., metal-organic frameworks, solid electrolytes).

FAQ

Can the VT-40x be used continuously at −40 °C?
Continuous operation at the rated minimum temperature (−40 °C) is feasible only under light vapor load conditions. Sustained condensation of high-volume aqueous streams will elevate chamber temperature due to latent heat input; users should monitor real-time display and adjust vacuum sequencing accordingly.

Is the stainless steel chamber resistant to nitric acid vapor?
No. 304 stainless steel exhibits poor resistance to oxidizing acids. For nitric acid or mixed acid systems, the optional glass condenser flask must be installed—and operated within its thermal shock limits (≤100 °C differential).

Does the unit include vacuum tubing or KF clamps?
No. All vacuum interconnect hardware—including KF25 centering rings, clamps, and Viton O-rings—must be sourced separately per user-specific line layout and pressure class requirements.

What maintenance intervals are recommended?
Compressor oil and refrigerant charge require no scheduled servicing. Annual inspection of condenser coil cleanliness (using compressed air), electrical terminal torque verification, and Pt100 calibration traceability check are advised for ISO/IEC 17025-accredited facilities.