The Keysight/Agilent/HP 59864B Ionization Gauge Controller measures vacuum pressure in gas chromatography-mass spectrometry systems, specifically designed for the 5973N Mass Selective Detector during chemical ionization operation. This dedicated controller interfaces with miniature triode ionization gauge tubes to deliver real-time pressure monitoring across the high-vacuum range encountered in GC-MS manifolds.
## Technical Specifications
• **Pressure Measurement Range:** 2 × 10⁻⁶ Torr to 5 × 10⁻² Torr
• **Gauge Type:** Miniature triode ionization gauge
• **Calibration Reference:** Nitrogen calibrated; displayed values referenced to helium
• **Display Format:** X.X-X notation (where -X represents base 10 exponent)
• **Pressure Cutoff Threshold:** 8 × 10⁻³ Torr (controller displays all 9’s then blanks if exceeded)
• **Power Input:** 100–240 V AC, 50–60 Hz
• **Power Consumption:** 25 W
• **Physical Dimensions:** 7.25 × 4 × 2.75 inches
## Key Features
• Automatic shutdown above 8 × 10⁻³ Torr protects against excessive pressure exposure
• Requires dedicated triode gauge controller cable for MSD connection
• Calibrated for nitrogen with helium reference for accurate CI manifold monitoring
• Compact benchtop footprint integrates readily into existing GC-MS configurations
## Typical Applications
• Chemical ionization (CI) pressure monitoring on Agilent 5973N Mass Selective Detectors
• Vacuum manifold diagnostics in GC-MS systems
• High-vacuum measurement in research and industrial analytical chemistry
## Compatibility & Integration
• **Primary Instrument:** Agilent/HP 5973N Mass Selective Detector (required for CI operation)
• **Gas Chromatographs:** Agilent 6890 Plus Series
• **Gauge Tubes:** Miniature triode style ionization gauges
Critical operational notes: Do not connect or disconnect the gauge cable during MSD vacuum operation (risk of tube implosion and glass fragmentation). When hydrogen is the carrier gas, avoid activating the triode gauge if hydrogen may have accumulated in the manifold due to filament ignition hazard.
