Leco – GCxGC System
Model – Pegasus 4D

Used / Sold as is / Can be used for parts / Untested / Condition unknown

🔬 Core Instrumentation
• Technique: Comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry (GC×GC–TOFMS)
• Ionization Method: Electron impact (EI)
• Mass Range: 5–1000 u
• Spectral Acquisition Rate: 1–500 spectra/second, enabling effective analysis of narrow GC×GC peaks
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🧊 Modulator & GC Columns
• Thermal Modulator: Dual-stage “quad-jet” cryogenic system:
o Liquid nitrogen variant: Cooling to ~–150 °C; dewars hold ~2 L (~1 hour operation)
o Consumable-free alternative: Pneumatic (air) cooling using cold/hot jets; no liquid nitrogen required
• Peak Width Capability: < 0.1 s in 2nd dimension with 0.5 m column
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💨 Gas & Vacuum System
• Carrier Gas Flow: 0–10 mL/min of helium
• Pumps:
o Turbomolecular pumps rated at 220 L/s and 600 L/s.
o Mechanical backing pump: ~14.2 m³/h
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🖥 Temperature & Pressure Conditions
• Primary GC Oven:
o Ambient to 400 °C; heating rate max 40 °C/min
• Secondary Oven: Offset +5 °C above primary oven; up to 400 °C
• Thermal Modulation Periods: 1–65 s; hot pulse typical 100–400 ms
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🏗 Physical Specifications
• Dimensions (instrument): 65″ H × 41″ D × 34″ W (170 × 104 × 86 cm)
• Weight: Approximately 738 lb (335 kg)
• Optional Immersion Cooler: 100 lb (45 kg)
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⚙ Electronics & Power
• Power Requirements: 110–120 V, 4.4 A or 220–240 V, 2.2 A at 50–60 Hz
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🔍 Software & Control
• Software: Windows-based ChromaTOF®, with:
o Automated Peak Find
o True Signal Deconvolution®
o Classification and comparison tools
• Integrated Control: Allows seamless operation of GC, modulator, TOFMS, and autosampler
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🌟 Analytical Performance
• Enhanced Resolution: GCxGC–TOFMS improves peak capacity dramatically, uncovering hundreds to thousands of compounds in complex samples
• Detection Range: Capable of capturing both volatile and semi-volatile organics with high sensitivity and mass accuracy