MKS Instruments / Granville-Phillips 358 Micro-Ion Controller

The MKS Instruments / Granville-Phillips 358 Micro-Ion Controller is a half-rack vacuum gauge controller engineered for precise pressure measurement across ultra-high to moderate vacuum ranges. It delivers optimized performance with Granville-Phillips Micro-Ion gauges, measuring from 5×10⁻¹⁰ Torr to 5×10⁻² Torr, with optional Dual Convectron capability extending measurement to 1000 Torr. The compact extruded aluminum enclosure provides superior electrical noise immunity while maintaining CE compliance.

– Technical Specifications

Pressure Measurement Range
• Micro-Ion Gauge: 5×10⁻¹⁰ Torr to 5×10⁻² Torr
• With Dual Convectron Option: Up to 1000 Torr (1300 mbar / 130 kPa for air and N₂)
• Display Units: Torr, mbar, Pa

Display & Readout
• 3-line bright green LED, flicker-free
• Resolution: 2 digits plus exponent
• Update Rate: 0.5 second intervals

Emission Current: Switch selectable—0.02 mA, 1 mA, or 4 mA

Degas Function: Electron bombardment with 2-minute timer, 4 W capacity

Electrical Requirements
• Input: 100–240 VAC, 50–60 Hz, 50 W maximum
• Set Point Relays: SPDT configuration, up to 6 relays
• Contact Ratings: 5 A @ 30 VDC (resistive), 5 A @ 120 VAC (resistive), 4 A @ 240 VAC (resistive)
• Setpoint Adjustment: Digital, 2 significant digits plus exponent; 10% hysteresis

Analog Output
• Micro-Ion Gauge: 0–10 V logarithmic, 1 V/decade
• Convectron Gauge: 1 V/decade logarithmic
• DC Offset Adjustment: −7 to +1 Volts

– Key Features

• Half-rack form factor integrates into 19-inch control racks
• Extruded aluminum case minimizes EMI susceptibility
• Front panel door conceals infrequently used controls for clean appearance
• RS-232 or RS-485/422 digital interfaces for computer-controlled system integration
• Not intended for flammable or explosive gases

– Compatibility & Integration

The 358 Micro-Ion Controller operates with Granville-Phillips Micro-Ion gauges as the primary measurement element. Dual Convectron gauge modules extend pressure range capability into moderate vacuum and atmospheric conditions. Set point relays enable process automation and interlocking. RS-232 and RS-485/422 interfaces support remote monitoring and control integration.