The MKS Instruments / Granville-Phillips 275 Convectron Gauge Controller is a vacuum measurement instrument that delivers accurate pressure readings from atmosphere to 1×10⁻⁴ Torr using convection-enhanced Pirani gauge technology. The controller combines fast millisecond response times with factory calibration for N₂ or air to ensure gauge-to-gauge reproducibility across diverse vacuum applications. Available in multiple configurations—digital display, RS-485 interface, and analog output versions—the 275 integrates readily into semiconductor manufacturing, vacuum coating, and freeze-drying systems.
Technical Specifications
Measurement Range: Atmosphere to 1×10⁻⁴ Torr; 1 mTorr to 760 Torr (calibrated); Atmosphere to 1.33×10⁻⁴ mbar; Atmosphere to 1.33×10⁻² Pa
Response Time: Approximately 810 ms to 90% final reading at 1 mTorr (N₂); approximately 40 ms at 1 Torr (N₂)
Maximum Operating Pressure: 1000 Torr (1333 mbar) true pressure
Calibration: Factory-calibrated for N₂ or air; gas-dependent correction curves provided
Power Supply: 11.0–16.0 Vdc or 11.5–26.5 Vdc
Power Consumption: 2 W max (Digital Interface, 0.12 A at 11.5 Vdc); 1.6 W max (Analog Output/Setpoint Relay, 0.1 A at 11.5 Vdc)
– Key Features
• Two independent single-pole, double-throw (SPDT) setpoint relays; 1 A at 30 Vdc resistive, AC non-inductive
• Relay contacts independent of meter movement for uninterrupted setpoint verification
• 3-digit green LED display with automatic range switching (Torr/mTorr, kPa/Pa)
• TTL-compatible logic inputs
• High accuracy and repeatability across measurement range
– Typical Applications
Semiconductor manufacturing, vacuum coating, freeze-drying, and process monitoring where millisecond response and wide-range pressure measurement are critical.
– Compatibility & Integration
Not suitable for flammable or explosive gases. Measurements with gases other than N₂ or air require conversion data. Available interface options support flexible system architecture integration.
