In industries such as pharmaceuticals, chemicals, new energy, and food, the drying process directly determines product quality and production efficiency. Traditional equipment relies on manual operation, suffering from large parameter fluctuations and high energy consumption. The PLC controlled vacuum drying system deeply integrates automation with low-temperature vacuum technology, providing a precise, traceable, and complete solution for heat-sensitive, solvent-containing, and high-value-added materials.
Why Choose a PLC Controlled Vacuum Drying System?
Vacuum drying utilizes a low-pressure environment to lower the boiling point of water, achieving rapid dehydration at low temperatures. The PLC acts as the "smart brain," enabling full-process automated control.
Precise Control, Consistent Quality
The system collects data in real-time via high-precision sensors. The PLC automatically adjusts heating power and vacuum pump groups based on preset curves, ensuring temperature fluctuations remain within ≤±1.0℃ and vacuum stability, preventing product discoloration, oxidation, or structural damage. It supports multi-stage process programming for customized heating, holding, vacuuming, and venting steps, adapting to different material characteristics to achieve "programmatic drying."
High Efficiency, Energy Saving, and Cost Reduction
The PLC automatically starts and stops different levels of vacuum pumps based on real-time vacuum levels. For instance, it activates only the mechanical pump during the rough vacuum stage and engages the Roots pump during the high vacuum stage to avoid energy waste. Integrated heat recovery modules and Variable Frequency Drives (VFD) supply air on demand, achieving comprehensive energy savings of 15%-25%.
Safe, Reliable, and Worry-Free Maintenance
Built-in multiple safety interlocks, such as over-temperature power cut-off and vacuum leakage alarms, trigger automatic shutdowns and record fault codes upon detecting abnormalities. All process parameters are automatically stored, supporting historical curves and report generation to meet GMP compliance requirements. Some systems also support remote monitoring.
System Components and Functions
Vacuum Drying Host: Double cone rotary, vacuum rake, or vacuum belt dryers, equipped with stirring or rotating mechanisms to ensure uniform heating.
Vacuum Pump Group: Rotary vane pumps, Roots pumps, or dry screw pumps; the PLC automatically controls starting, stopping, and switching.
Heating System: Hot water/steam/thermal oil circulation with electric regulating valves; the PLC adjusts heating medium flow via PID based on material temperature.
Condensation Recovery Unit: For materials containing organic solvents, equipped with shell-and-tube condensers and solvent receiving tanks; the PLC controls cooling water flow and tank switching.
PLC Control Cabinet: Core control unit featuring brands like Siemens, Mitsubishi, or Omron, equipped with color touch screens.
Instruments and Actuators: Temperature sensors, pressure transmitters, pneumatic valves, frequency converters, etc.
How to Select the Right PLC Controlled Vacuum Drying System?
Material Characteristics: Powder/paste/liquid, heat sensitivity, presence of organic solvents, or nitrogen protection requirements determine the host type (rake, double cone, belt, etc.) and material (304, 316L, Hastelloy).
Drying Process Parameters: Target moisture content, maximum allowable temperature, required vacuum level, batch processing volume, and drying time.
Automation Level: Requirements for remote monitoring, MES system integration, or electronic signatures (21 CFR Part 11).
Safety and Explosion Proof Rating: Systems handling flammable solvents must meet Ex standards; PLC cabinets must be pressurized or flame-proof.
We provide both standardized equipment and customized services. From project demonstration and manufacturing to on-site debugging and personnel training, we ensure seamless integration of the system with your production line.