VC-5000 Vacuum Controller by Jihepu

Overview

The VC-5000 Vacuum Controller by Jihepu is an engineered precision instrument designed for closed-loop vacuum regulation in rotary evaporation, fractional distillation, and inert-atmosphere synthesis workflows. Built upon a robust pressure feedback architecture, it employs a high-stability imported semiconductor pressure transducer to continuously monitor absolute chamber pressure in real time, enabling dynamic adjustment of vacuum level via a long-life solenoid control valve. Unlike open-loop vacuum systems reliant on manual needle valves or fixed-speed pumps, the VC-5000 implements active PID-based regulation—maintaining setpoint stability within ±1–10 hPa across variable load conditions. Its core function is to decouple vacuum generation from process control: rather than running a pump at full capacity and throttling flow mechanically, the controller modulates pump duty cycle or valve aperture to sustain precise sub-atmospheric pressure—critical for preventing bumping, foaming, or thermal degradation during low-boiling-point solvent removal (e.g., dichloromethane, ethanol, chloroform) or oxygen-sensitive compound isolation.

Key Features

• High-fidelity pressure sensing using a calibrated, acid/alkali-resistant semiconductor transducer with factory-traceable calibration data.
• Full-color 4.3-inch TFT capacitive touchscreen interface supporting intuitive setpoint entry, real-time pressure curve visualization, and multi-level user access control.
• Five-stage programmable vacuum ramping: users define time–pressure profiles (e.g., 500 → 200 → 50 hPa over 30 min) for controlled fractionation in column chromatography or gradient distillation.
• Integrated inert gas purging capability with adjustable flow rate—enabling automated N₂ or Ar backfill to maintain reducing or anaerobic environments during concentration or crystallization steps.
• Dual-mode operation: supports both constant-pressure (setpoint hold) and stepwise-programmed vacuum protocols; includes one-touch atmospheric venting with audible confirmation and pressure decay monitoring.
• Relay-controlled vacuum pump interface (220 VAC / 110 VAC compatible) with soft-start logic to reduce mechanical stress and extend pump service life.

Sample Compatibility & Compliance

The VC-5000 is fully interoperable with major rotary evaporator platforms—including Buchi (Switzerland), Heidolph (Germany), IKA (Germany), Yamato (Japan), and EYELA (Japan)—via standardized Ø8 mm PTFE-lined vacuum tubing connections. Its chemically inert wetted path (stainless-steel sensor housing, fluoropolymer-sealed valve assembly, and acid-resistant display enclosure) ensures compatibility with aggressive solvents (e.g., HCl, acetic anhydride, trifluoroacetic acid) and halogenated media. The unit meets CE electromagnetic compatibility (EMC) and low-voltage directive requirements for laboratory instrumentation. While not certified under FDA 21 CFR Part 11, its audit-ready operational log (timestamped pressure records, program execution history, and fault codes) supports GLP/GMP-aligned documentation practices when integrated into validated evaporation workflows per ISO 17025 or ASTM D1120 standards.

Software & Data Management

The VC-5000 operates as a standalone embedded system with no external PC dependency. All vacuum programs, calibration offsets, and user preferences are stored in non-volatile memory with battery-backed retention. The touchscreen interface logs up to 10,000 timestamped pressure readings (sampled at 1 Hz) internally, exportable via USB-C to CSV for post-run analysis in Excel or MATLAB. Optional RS-485 Modbus RTU communication enables integration into centralized lab automation systems (e.g., LabVantage, STARLIMS) for remote monitoring and batch record linkage. Audit trails include operator ID (PIN-protected), program start/stop timestamps, deviation alerts (>±15 hPa from setpoint for >30 s), and automatic error-code logging—facilitating root-cause analysis during QA/QC investigations.

Applications

• Optimized solvent recovery in rotary evaporation: maintains stable vacuum during volume reduction of heat-labile APIs, preserving yield and purity in pharmaceutical R&D.
• Stepwise vacuum distillation for natural product isolation—gradually lowering pressure to separate terpenes, alkaloids, or fatty acids without thermal decomposition.
• Inert-gas-assisted concentration of air-sensitive organometallics (e.g., Grignard reagents, lithium aluminum hydride derivatives) under continuous N₂ blanket.
• Controlled lyophilization pre-concentration: stabilizing sample temperature by regulating vapor pressure prior to freeze-drying.
• Reaction monitoring in Schlenk-line setups where precise vacuum/inert gas cycling is required between synthetic steps.

FAQ

Does the VC-5000 support external pump speed modulation?
No—it controls vacuum level exclusively via solenoid valve actuation and relay-based pump on/off switching. For variable-speed pump integration, a third-party analog 0–10 V signal converter is required.
Can pressure units be switched between hPa, mmHg, and Torr on-screen?
Yes—the display defaults to hPa but allows user-selectable units (hPa, mmHg, kPa, Torr) without recalibration.
Is firmware upgrade possible in the field?
Yes—updates are delivered via USB flash drive using signed binary files; version history and checksum verification are displayed during installation.
What maintenance intervals are recommended for the solenoid valve?
Under typical lab use (≤8 hrs/day), no scheduled maintenance is required before 5 million cycles; performance validation is advised annually using a NIST-traceable reference manometer.
Does the unit include a built-in vacuum pump?
No—the VC-5000 is a controller only and must be paired with an external diaphragm or oil-free scroll pump rated for ≤1 m³/h flow and ≥0.01 hPa ultimate vacuum.