The Inficon / Leybold 235003 Center Three is a three-channel vacuum gauge controller designed for precision measurement and control of total pressure across multiple vacuum systems. This multi-channel display and control unit interfaces with Leybold transmitter series to enable simultaneous monitoring and regulation of vacuum environments in laboratory and industrial settings.
## Technical Specifications
• **Channels:** 3 independent measurement channels
• **Mains Voltage:** 90–250 VAC, 50–60 Hz
• **Power Consumption:** Maximum 65 W
• **Transmitter Supply:** +24 VDC ±5%, 500 mA (SELV-compliant)
• **Operating Temperature:** +5 to +50 °C
• **Storage Temperature:** −20 to +60 °C
• **Relative Humidity:** Maximum 80% (up to 31 °C); maximum 50% above 40 °C
• **Maximum Altitude:** 2000 m NN
• **Pollution Degree:** II
• **Protection Class:** II, Overvoltage Category II
• **Environmental Rating:** IP20 protection, indoor use only
• **Measurement Error:** Offset ≤ 0.01 % FS; Drift rates: Fast ≤ 10 s⁻¹, Normal ≤ 50 s⁻¹
## Key Features
• Front-panel control via 4 pushbuttons for manual operation
• RS232C remote control interface for system integration
• Per-channel sensor connections via RJ45 (FCC 68) and 15-pin D-Sub female connectors
• Self-resetting transmitter fuse protection
• Mains input: IEC 320 C14 European appliance connector
## Typical Applications
Total pressure measurement in vacuum systems, research chambers, coating processes, and industrial vacuum environments requiring real-time multi-point monitoring and automated control.
## Compatibility & Integration
The controller operates with THERMOVAC (TTR 90, TTR 91, TTR 96, TTR 100, TTR 101), IONIVAC (DI 201, DI 2000, DI 2001, DI 2001 rel.), PENNINGVAC series, CERAVAC series, and compatible transmitters ITR 90 and ITR 200. Each transmitter must be operated per its respective operating manual specifications.
