Fourier Transform Infrared spectrometer for molecular identification and chemical analysis
Agilent Cary 600 Series FTIR Spectrometer with GladiATR
Used · carl-5101 0%
“The Agilent Cary 600 Series is a trusted mid-IR FTIR spectrometer and comes with a GladiATR accessory, making it a complete, research-capable system at the lower end of the typical price range — the zero seller rating is a concern but the price and package are compelling.”
THERMO SCIENTIFIC NICOLET CONTINUUM FT-IR MICROSCOPE #USED
Used · g.a.s.7 100%
“The Thermo Nicolet Continuum FT-IR Microscope is a specialised, high-value Nicolet-brand system capable of microspectroscopy, offered well below typical benchtop FTIR pricing from a perfect-rated seller.”
AGILENT TECHNOLOGIES 4100 ExoScan FTIR Handheld 0023-20 Infrared Spectrometer
New other (see details) · sparehuba_47 100%
“The Agilent 4100 ExoScan is a portable FTIR from a trusted brand listed as new-other condition, offering a unique handheld capability at a price below the typical benchtop range from a perfect-rated seller.”
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Before you buy — what to inspect
Nicolet instruments from any era are bulletproof. The iS series (2010+) runs on modern Windows and OMNIC; older models (Avatar, Nexus) may need legacy software but work perfectly. Parts readily available. Service techs know these instruments inside-out.
Checklist: Verify HeNe laser is stable (should see strong centerburst), check desiccant indicator, run polystyrene verification, confirm software license transfers
Bruker optics are excellent. OPUS software is powerful but has a steeper learning curve than OMNIC. German engineering means these instruments last forever. The Vertex 70 is research-grade; Tensor 27 is the QC workhorse.
Checklist: Run OpusCheck diagnostics, verify detector response, check for RockSolid interferometer alignment status, confirm OPUS license situation
Excellent instruments with strong pharma pedigree. Spectrum software is user-friendly. The Frontier is their high-end research instrument; Spectrum 100/Two are reliable workhorses. Slightly less common on secondary market than Thermo.
Checklist: Run built-in validation tests, check ATR crystal condition, verify software license, inspect sample compartment seals
Agilent acquired Varian's IR line. Good instruments but less common, so parts and service can be harder to source. The Cary 660 is research-grade; 630 is the compact QC model.
Checklist: Confirm software compatibility with current Windows, check interferometer alignment, verify accessory compatibility
Japanese manufacturer with excellent optics but smaller US presence. Great value on secondary market because of lower brand recognition. Instruments perform as well as the big three.
Checklist: Verify US service availability for your region, check software version, run standard validation
Budget new alternatives
Labs wanting a new, compact, reliable FTIR at lower cost than full-size instruments
Labs needing pharmaceutical-grade performance with strong compliance software
Dedicated single-application use like incoming material ID or polymer screening
Labs already using Shimadzu equipment wanting vendor consolidation
FTIR spectrometers work by splitting infrared light into its component wavelengths using an interferometer (typically a Michelson design), passing it through or reflecting it off a sample, and measuring which wavelengths are absorbed. The resulting spectrum acts as a molecular fingerprint—every compound has unique absorption peaks corresponding to specific chemical bonds (C-H stretches, carbonyl peaks, O-H bends, etc.). Modern FTIRs collect a full spectrum in under a second, making them vastly superior to older dispersive IR instruments. They're used for identifying unknowns, verifying raw material identity, monitoring reactions, quantifying components in mixtures, and analyzing coatings, films, and surfaces. Most labs use them with ATR (Attenuated Total Reflectance) accessories, which let you analyze samples directly without preparation—just press your sample against a crystal and measure. Transmission mode requires KBr pellets or thin films but gives cleaner spectra for some applications. Research-grade instruments offer better resolution (down to 0.5 cm⁻¹) and extended spectral ranges into the far-IR or near-IR, while routine QC instruments typically offer 4 cm⁻¹ resolution covering 4000-400 cm⁻¹, which handles 95% of organic chemistry needs.
The Nicolet iS50 dominates academic and industrial labs because of its exceptional reliability, intuitive OMNIC software with massive spectral libraries, and modular design accepting virtually any accessory. The built-in ATR option and automated accessory recognition make it genuinely easy to use. Thermo's service network is unmatched—parts and support available for 15+ year old instruments. The sealed and desiccated optical bench handles humid environments better than competitors.
What you lose: Older instruments may lack automated ATR recognition, touchscreen interfaces, built-in validation routines, and modern Windows compatibility. Far-IR capability usually isn't included. MCT detector option (for fast scanning or microscopy) typically absent in budget units. Some older software lacks 21 CFR Part 11 compliance features. Resolution may be limited to 4 cm⁻¹ vs. 0.5 cm⁻¹ on research instruments.
What you keep: Core analytical performance is identical—a 2005 Nicolet produces the same quality spectrum as a 2024 iS50. Mid-IR spectral range (4000-400 cm⁻¹), 4 cm⁻¹ resolution, and DTGS detector cover 95% of applications. Library searching works the same. ATR accessories are cross-compatible. The physics hasn't changed since the 1980s.
For pharmaceutical applications under 21 CFR Part 11, ensure the software supports electronic signatures, audit trails, and user access controls. IQ/OQ documentation packages are available from manufacturers but typically cost $3000-8000. Consider whether your used instrument can be validated—some older software versions lack compliance features. USP <197> and EP 2.2.24 specify FTIR methods for identity testing, requiring specific resolution and wavenumber accuracy verification.
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