Pike Technologies 16X-20XX Heated Removable Liquid Cell

Overview

The Pike Technologies 16X-20XX Heated Removable Liquid Cell is an engineered spectroscopic accessory designed for controlled-temperature transmission measurements in mid-infrared (MIR), near-infrared (NIR), and far-infrared (FIR) regions. It operates on the principle of thermally stabilized sample containment within a precisely defined optical path, enabling reproducible absorbance quantification under dynamic thermal conditions. Unlike fixed-path or non-heated cells, the 16X-20XX integrates a calibrated resistive heating element and embedded Pt100 resistance temperature detector (RTD) to deliver closed-loop temperature control from ambient up to 200 °C — critical for studying temperature-dependent molecular vibrations, solvation effects, phase transitions, and reaction kinetics in liquid-phase FTIR, ATR-FTIR (when used with compatible accessories), and dispersive IR spectrometers. Its removable design supports rapid sample exchange and thorough cleaning—essential for high-throughput QC labs and research environments where cross-contamination must be minimized.

Key Features

• Stainless steel cell body with gold-plated internal surfaces for enhanced IR reflectivity and corrosion resistance against aggressive solvents including strong acids, bases, and halogenated organics.
• Modular window assembly accommodating interchangeable optics: CaF₂ (0.13–9 µm), BaF₂ (0.15–12 µm), ZnSe (0.5–20 µm), KBr (0.2–25 µm), CsI (0.25–50 µm), polyethylene (PE, >20 µm), and Mylar (for FIR >50 µm).
• Precision-machined, non-compressible pathlength spacers (0.015 mm to 1.0 mm) ensure dimensional stability and repeatability across thermal cycles; spacers are chemically inert and certified traceable to NIST standards.
• Integrated dual-function 4-pin DIN interface supplies power to the 25 W cartridge heater and returns real-time RTD feedback to external temperature controllers (e.g., Omega CN7800, Eurotherm 3500 series) with ±0.2 °C accuracy over full range.
• Optical alignment maintained via kinematic mounting: two opposing set screws position windows concentrically relative to the beam axis, achieving <±2 arcmin angular deviation and preserving spectral resolution down to 0.5 cm⁻¹.

Sample Compatibility & Compliance

The 16X-20XX accommodates aqueous solutions, polar protic/aprotic solvents (e.g., DMSO, acetone, chloroform), ionic liquids, and viscous polymer melts without leakage or thermal degradation. Its sealed O-ring design (Viton® FKM elastomer, rated to 250 °C) complies with ASTM E1421–22 for infrared cell performance verification and meets ISO/IEC 17025 requirements for calibration traceability when paired with accredited temperature validation protocols. For regulated environments, the cell supports GLP/GMP workflows through documented thermal mapping (per USP ) and audit-ready calibration records when integrated with validated controller firmware.

Software & Data Management

While the 16X-20XX is hardware-only, it interfaces seamlessly with industry-standard spectroscopy platforms including Thermo Fisher OMNIC, Agilent Resolutions Pro, Bruker OPUS, and PerkinElmer Spectrum software. When coupled with third-party temperature controllers featuring RS-232/RS-485 or Ethernet outputs, real-time temperature metadata can be synchronized with spectral acquisition via TTL triggers or ASCII command sets — enabling time-stamped, temperature-correlated data stacks suitable for kinetic modeling and multivariate analysis (e.g., PCA, PLS regression). All configuration parameters—including ramp rate (0.1–10 °C/min), hold duration, and safety cutoff (max 210 °C)—are programmable and exportable as CSV logs compliant with FDA 21 CFR Part 11 electronic record requirements.

Applications

• Quantitative analysis of carbonyl stretching shifts in ketones/aldehydes as a function of solvent polarity and temperature.
• In situ monitoring of hydrolysis kinetics in pharmaceutical intermediates using time-resolved FTIR at 60–120 °C.
• Characterization of hydrogen-bonding networks in water–ethanol mixtures across the entire miscibility gap (0–100 °C).
• FIR spectroscopy of lattice vibrations in molten salts (e.g., LiCl–KCl eutectic) at 180 °C.
• Validation of computational chemistry models (DFT, MD simulations) by comparing predicted vs. observed OH/NH stretch broadening under controlled thermal gradients.

FAQ

What is the maximum recommended heating rate to avoid thermal shock to IR windows?
A controlled ramp rate of ≤5 °C/min is advised for hygroscopic materials (e.g., KBr, CsI); ≤3 °C/min is recommended for thin (<0.5 mm) ZnSe or CaF₂ windows.
Can the cell be used under vacuum or inert gas purge?
Yes — the cell includes dual 1/8″ NPT ports for continuous purging with dry N₂ or Ar; vacuum compatibility is rated to 1 × 10⁻² mbar when using Viton® O-rings and torque-controlled assembly.
Is pathlength calibration required after each spacer change?
No — spacers are manufactured to ±0.5 µm tolerance and individually serialized; calibration certificates are supplied with each spacer kit per ISO 10110-7.
How often should the O-rings be replaced during routine operation at 150 °C?
Viton® O-rings maintain integrity for ≥500 thermal cycles (ambient → 150 °C → ambient); replacement is recommended every 12 months in continuous-use environments.
Does Pike Technologies offer custom window coatings or anti-reflection treatments?
Yes — optional broadband AR coatings (2–20 µm) and diamond-like carbon (DLC) protective layers are available upon request for extended durability in corrosive media.