Pegasus GC-HRT+ 4D High Resolution Time-of-Flight Mass Spectrometer


ChromaTOF Brand Software

Folded Flight Pat Technology

Folded Flight Path Technology

R=50,000 ; Mass accuracy < 1ppm


LECO’s most recent innovation in the gas chromatography sector, the Pegasus GC-HRT+ 4D, provides users with the unprecedented ability to investigate complex samples and identify unknown analytes. Combining the highest performance GCxGC and TOFMS on the market with High Resolution Deconvolution® (HRD®), users are able to find more analytes than ever before and identify components with ultimate confidence.

These advances in technology are paired with LECO’s ChromaTOF® brand software, which is tailored to get the most out of your High Resolution data when used in conjunction with NIST and Accurate Mass Libraries. Further features such as the generation of Pseudo-Molecular ions via Chemical Ionization, retention time matching, isotope patterns, and mass accuracy of deconvoluted fragments, all lead to confident identification.

With mass accuracies of 1 ppm and peak capacity potential at least two times greater than any mass spectrometer currently available on the marketplace, the Pegasus GC-HRT+ 4D is the solution to winning the fight against coelution and analyzing even the most complex samples.


Benefits of LECO Pegasus GC-HRT+ 4D:

  • Encoded Frequent Pushing™ (EFP™) technology greatly expands the analytical capabilities of LECO’s GC-HRT+ and GCxGC-HRT+ instruments, contributing to a significant increase of sensitivity, expanded dynamic range, and much more. Read more about EFP technology by downloading a Technical Tip - Encoded Frequent Pushing from Documents Tab.
  • High Resolution Deconvolution (HRD) deconvolutes and identifies important analytes in complex matrices.
  • LECO’s Folded Flight Path® (FFP®) technology not only provides high resolution and sensitivity, but also provides higher orders of TOF focusing which prevents standard TOF dispersion and allows for broader initial conditions.
  • Harness the power of accurate mass and high resolution mass spectrometry with Spectral Analysis Tools (SAT). This innovative toolkit, paired with ChromaTOF® brand software, is designed to streamline identification and relative quantitation of heteroatomics species in either GC or GCxGC data sets Learn more here from Spectral Analysis Tools (SAT) Brochure on Documents Tab.
  • KADAS®, our patented ion statistics-based data acquisition system, dramatically reduces noise, ensures mass accuracy and reduces file size.
  • High Resolution Deconvolution® (HRD®) deconvolutes and identifies important analytes in complex matrices.
  • ChromaTOF brand software designed specifically for HRT+ instrumentation and GCxGC support, add advanced qualitative and quantitative capabilities to an all-in-one user-friendly datasystem.



Save time and effort in your laboratory by easily identifying unknowns and having more confidence in your library hits. The chemical ionization (HR-CI) source for the Pegasus GC-HRT+ 4D allows users to dramatically change their high resolution GCMS information with never before seen mass accuracy and resolution on pseudo-molecular ions. The Pegasus GC-HRT+ 4D is available with both electron ionization (EI) and chemical ionization (CI) sources, providing the option of comparison with classic library spectra (EI), and preservation of the molecular ion (CI). Together, the HR-CI source and the Pegasus GC-HRT+ 4D provide a complete package for high-throughput/high-information content analysis, with resolution up to 50,000 FWHM, mass accuracies less than 1 ppm, and acquisition rates up to 200 spectra/second—all with high-integrity isotopic abundance measurements to facilitate rich information content and high-confidence analyte identification.


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CI ConfirmIdentify your Unknown


The dual stage-quadjet modulator and secondary oven are mounted inside the primary GC oven. Controlof autosampler, GC, LECO’s GCxGC Thermal Modulator, and the Pegasus TOFMS is fully integrated within a single computer using LECO’s ChromaTOF brand software.



Do you want to have the ultimate confidence in your library hit? LECO’s AML allows you to compare accurate mass new sample data against an accurate mass library data set. The AML rank provides a similarity score that uses accurate mass sample data the way it should be used.



LECO’s versatile instrumentation can be used to perform a wide range of applications. Please find below a selection of application notes for the most popular applications. Contact our sales and application specialists for more details.

Discovery of Environmental Pollutants at an Electronic Waste Recycling Facility by Pegasus® GC-HRT 4D

This study aimed to discover new and emerging organic contaminants in the environment of an e-waste recycling facility using comprehensive two-dimensional gas chromatography high resolution time-of-flight mass spectrometry. GC×GC-HRT is a powerful tool for the comprehensive analysis and chemical characterization of analytes in complex matrices.Learn more...

Utilizing the Pegasus GC-HRT 4D for Improved Yeast Metabolite Characterization

LECO's Pegasus GC-HRT 4D and ChromaTOF-HRT brand software demonstrated to be valid tools for molecular profiling of yeast. The combination of EI and CI-HRT high resolution, accurate mass data, facilitates rapid compound identification.Learn more...

Non-Targeted and Targeted Aroma Analysis of Name-Brand and Imitation Perfume Samples by GC×GC-HRT

High resolution HR-TOFMS delivered accurate mass data formula determinations and more confident identifications of unknowns. Ref: 203-821-500Learn more...

Improved Identification of Brand-Distinguishing Analytes in Perfume Samples with GC×GC and HR-TOFMS

High resolution TOFMS adds another layer of information to the analysis with accurate mass data that are used for definitive formulae determinations and confident analyte identifications.Learn more...

Options & models


Various options are available for this product. Contact our sales and application specialists to select the right configuration for your application.

Gas Chromatography

Gas chromatography featuring the 7890 GC system. Various inlets and injectors are also available.

LECO's L-Pal3 Automated Sample Injector

LECO's L-Pal3 Automated Sample Injector

Increase the throughput in your lab with our L-PAL3 System

Sample Preparation & Automation

Sample preparation and automation solutions for GC and GC/MS designed to optimize performance, enhance productivity, and extend capabilities. Solutions include Liquid/Headspace/SPME injections, Thermal Desorption, and Automated Liner EXchange (ALEX).

Nitrogen Generators

Nitrogen generators that operate on house air or a built-in compressor.