The HIS2000R-A300-9 operates on the same resistive thermal emission principle as all HIS2000R models. Electrical current through the 40 mm² NiCr filament raises its temperature; the nanostructured surface (emissivity >0.9) radiates energy across a broad Planck-governed spectrum. The gold-plated reflector captures rear-hemisphere radiation and redirects it forward through the sapphire window, recovering energy that would otherwise be absorbed by the TO-8 package walls.

The reduced 560 mW output versus the HIS2000R-A300-6 (~800–1000 mW) results from operating the filament at a lower drive point. Lower filament temperature shifts the Planck emission peak toward longer wavelengths and reduces total radiated power; the sapphire window transmits the 2–6 µm fraction of this reduced output. The consequence is not merely lower output: the lower operating temperature also reduces thermal stress on the filament, the window solder bond, and the package, and decreases the heat load that the instrument enclosure must manage.

The soldered sapphire window transmits efficiently within 2–6 µm, and the hermetic nitrogen fill ensures a stable internal environment throughout service life. Pulsed modulation at up to 4 Hz supports lock-in detection in NDIR systems, suppressing thermal background and 1/f noise to improve signal-to-noise ratio and long-term measurement stability.

Matched Output for Thermally Constrained Systems

At 560 mW, the HIS2000R-A300-9 provides more than four times the output of the TO-39 HIS550R-A (135 mW) while operating at a lower drive level than the HIS2000R-A300-6. This makes it the correct choice for instrument designs where the optical system — path length, detector sensitivity, and filter efficiency — yields adequate signal-to-noise at 560 mW, and where the power budget, enclosure thermal management capacity, or desired filament service life favour a reduced operating point over maximum output. The 560 mW output level is also well-suited to instruments where detector saturation or dynamic range limitations make very high source power counterproductive.

Soldered Sapphire Window: Maximum Environmental Robustness

Sapphire is the most mechanically robust optical window material available for infrared applications: Mohs 9 hardness, chemical inertness to acids, alkalis, and solvents, and a melting point above 2000 °C. The soldered window-to-package bond maintains hermetic integrity through repeated thermal cycling at reduced drive temperatures, and is more resistant to long-term bond degradation than adhesive constructions. For instruments where window integrity over a multi-year service life without replacement is a requirement, soldered sapphire is the preferred construction.

Optimised for the 2–6 µm NDIR Detection Band

The 2–6 µm band contains the fundamental absorption features of the most commercially important NDIR gases: CO₂ at 4.26 µm, CO at 4.67 µm, CH₄ at 3.31 µm, and the C–H stretching bands of hydrocarbons in the 3.0–3.5 µm region. The sapphire window transmits efficiently within this band, and all transmitted power contributes directly to detection sensitivity. Applications requiring access to longer wavelengths (6–11 µm or 6–14 µm) should consider the CaF₂ or BaF₂ variants.

Large 40 mm² Element with Gold-Plated Reflector

Even at the reduced drive level of the HIS2000R-A300-9, the 40 mm² element generates substantially more radiant flux than the 11 mm² TO-39 elements, providing a signal budget that supports long-path gas cells and optical systems with moderate insertion loss. The gold-plated reflector (>98% reflectivity across the mid-IR) recovers rear-hemisphere emission, ensuring that forward output is maximised at the chosen operating point.

Hermetic Sealing with Nitrogen Gas Fill

The nitrogen fill displaces oxygen and moisture from the package interior, eliminating oxidative filament degradation and internal surface corrosion throughout the device’s service life. The reduced filament temperature of the HIS2000R-A300-9 further slows oxidation kinetics, contributing to longer expected filament lifetime relative to maximum-output operation.

Patented Nanostructured High-Emissivity Surface

Emissivity exceeding 0.9 ensures near-blackbody spectral behaviour, maximising radiant efficiency at the operating temperature and producing a spectrally predictable output. This simplifies bandpass filter selection and system calibration across production units.

Robust TO-8 Package with Pulsed Operation

The TO-8 package provides good thermal dissipation at the 2.5 W maximum rating — with the HIS2000R-A300-9 typically operated below this ceiling, thermal management requirements are further relaxed. Modulation at up to 4 Hz supports synchronous lock-in detection for improved noise rejection and baseline stability in precision instruments.

• NDIR Gas Analysis with Moderate Path Lengths: High-precision detection of CO₂, CO, CH₄, and hydrocarbons in fixed-point and extractive gas analysers where optical path length and detector efficiency deliver adequate sensitivity at 560 mW, and where lower power consumption or reduced enclosure thermal load is an instrument design advantage.
• Thermally Constrained Industrial Instruments: Fixed-installation analysers in process gas monitoring, CEMS, and industrial safety systems where enclosure thermal budget is limited and the maximum output of the HIS2000R-A300-6 is not required by the optical design.
• Long-Life Field Deployments: Instruments requiring multi-year unattended operation between service intervals, where reduced filament operating temperature contributes to extended lifetime and the soldered sapphire window ensures maintained hermetic integrity.
• Environmental and Emissions Monitoring: Outdoor and semi-outdoor CEMS and atmospheric monitoring systems targeting CO₂, CO, and hydrocarbon species in the 2–6 µm band, where hermetic sealing and sapphire’s environmental resistance are required alongside moderate power consumption.
• Automotive and Exhaust Analysis: Engine test bench and vehicle exhaust analysers measuring CO, CO₂, and HC in the 2–6 µm band, in instrument designs where detector dynamic range or optical system efficiency makes the full ~1 W output unnecessary.
• Mid-Infrared Spectroscopy: Laboratory and process-line FTIR instruments and dispersive IR analysers operating in the 2–6 µm band where the combination of high output, hermetic sealing, and sapphire robustness is required at a moderate power level.
• Medical and Clinical Gas Analysis: Respiratory gas monitors and capnographs in hermetically sealed configurations where instrument power budget or detector sensitivity makes 560 mW an appropriate source level.

United Spectrum Instruments (USI) is a specialist distributor and application partner for advanced photonics, infrared sensing, and scientific instrumentation in India. USI combines access to globally leading component technologies with deep domain expertise, supporting customers from initial product selection through OEM system integration and volume production supply.

Key reasons to work with United Spectrum Instruments:

• Access to internationally leading infrared emitter and photonics technologies
• Expert application support for NDIR gas sensing, mid-IR spectroscopy, and high-power IR system design
• OEM consultation covering component selection, optical system design, thermal management, and production ramp
• Reliable supply for evaluation samples and production quantities
• Established partnerships with leading international photonics manufacturers
• Fast, responsive technical communication and application-focused engineering guidance