KNAUER AZURA Valve Unifier VU 4.1

The KNAUER AZURA VU 4.1 Valve Unifier is a compact valve drive unit designed for automated valve switching in HPLC/UHPLC systems. It enables precise and fast control of liquid flow paths, which is essential for applications such as column switching, sample injection, eluent selection, and fractionation.

Due to its ultra-fast switching speed, the flow path is interrupted only briefly, significantly reducing pressure spikes and improving system stability.

The device uses RFID technology for automatic valve identification, ensuring easy and error-free valve exchange. Integrated GLP data monitoring simplifies maintenance tasks such as rotor seal replacement.

The unit can be operated:

• stand-alone via display
• via software
• through LAN or analog I/O

This makes it easy to integrate into almost any LC system.

Key Features

• Universal valve drive for >40 valve types
• Ultra-fast switching (minimal pressure spikes)
• RFID valve identification
• GLP data monitoring for maintenance
• Standalone operation via display
• Integration into LC systems (LAN, analog, software)
• Compact design
• Easy maintenance and valve exchange
• Flexible use in LC and industrial applications

Technical Specifications

Communication & Control

• Interfaces: LAN, display, terminal strip
• Control:
  • display (stand-alone)
  • software
  • event control
• Inputs:
  • Home
  • Backward/Inject
  • Forward/Load
  • Start
• Outputs:
  • Trigger out
  • Event output

Performance & Features

• Ultra-fast valve switching
• Reduced pressure peaks
• Supports >40 valve types
• RFID valve recognition
• GLP maintenance tracking

Operating Conditions

• Temperature: 4–40 °C
• Humidity: < 90% non-condensing

Power & Dimensions

• Power supply: external 24 V DC
• Power consumption: 65 W
• Dimensions: 80 × 123 × 192 mm
• Weight: 1.9 kg

Typical Applications

• Column switching
• Eluent selection
• Sample injection
• Fraction collection
• LC workflow automation
• Dosing systems in chemical industry