The HIS2000R-C300-9 operates as a resistive thermal emitter. 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 CaF₂ window, recovering energy that would otherwise be absorbed by the TO-8 package walls.

Calcium fluoride transmits efficiently from ~0.13 µm to ~11 µm, with its long-wave cut-off governed by multi-phonon lattice absorption. The CaF₂ window passes both the 2–6 µm Planck emission peak region and the extended 6–11 µm fingerprint band; the 730 mW output figure represents the sum of transmitted power across this full 2–11 µm range at the device’s operating drive level. The reduced drive level relative to the HIS2000R-C300-6 results in a slightly lower filament temperature, lower total radiated power, and consequently 730 mW transmitted output versus 780 mW — a 6.4% reduction that translates into measurably lower power consumption, heat generation, and thermal cycling stress on the window bond.

The nitrogen fill eliminates internal oxygen and moisture throughout service life, protecting the filament and the inner window surface from degradation. Pulsed modulation at up to 4 Hz supports synchronous lock-in detection, rejecting thermal background and 1/f noise to improve signal-to-noise ratio and long-term baseline stability in field instruments.

Balanced Output for Broadband Mid-IR Sensing

At 730 mW across 2–11 µm, the HIS2000R-C300-9 delivers more than 3.8× the output of the hermetically sealed TO-39 HIS550R-C (190 mW, same window), with a reduced drive level that lowers power consumption and package thermal load compared to the HIS2000R-C300-6 (780 mW). This makes it the appropriate choice when the optical system — path length, detector sensitivity, and filter efficiency — yields adequate signal-to-noise at 730 mW, and when reduced heat generation or extended service life are instrument design objectives.

CaF₂ Window: Extended Coverage to 11 µm with Practical Durability

CaF₂ transmits from ~0.13 µm to ~11 µm, extending the detectable spectral range well beyond the 6 µm sapphire cut-off into the molecular fingerprint region. The 6–11 µm band contains the fundamental absorption features of SO₂ (~7.3 µm and ~8.7 µm), NH₃ (~8.5–11 µm), N₂O (~7.8 µm), and bending and stretching modes of many organic compounds. CaF₂’s Mohs ~4 hardness and low hygroscopicity provide meaningfully better window durability than BaF₂ (Mohs ~3, hygroscopic), making it more suitable for instruments that experience thermal cycling or incidental moisture exposure at the system level.

Hermetic Sealing and Nitrogen Fill

The hermetic package and nitrogen fill eliminate internal oxygen and moisture, preventing filament oxidation and corrosion of internal surfaces throughout service life. For the CaF₂ window specifically, the nitrogen fill protects the inner window surface from the moisture exposure that would etch CaF₂ over time. The reduced operating drive of the HIS2000R-C300-9 also reduces thermal cycling stress on the glued window bond relative to the maximum-drive HIS2000R-C300-6, contributing to extended bond reliability in instruments with frequent power cycling.

Large 40 mm² Element with Gold-Plated Reflector

The 40 mm² NiCr filament generates substantially greater total radiant flux than the 11 mm² elements of the HIS550R series at any comparable drive level. The gold-plated reflector (>98% reflectivity across the mid-IR) captures rear-hemisphere emission and directs it forward through the CaF₂ window, ensuring that the full benefit of the large element area is realised in the transmitted output. The large source étendue improves coupling efficiency into multipass cells and large-aperture collection optics.

Patented Nanostructured High-Emissivity Surface

Emissivity exceeding 0.9 ensures near-blackbody spectral behaviour across the 2–11 µm emission band, maximising radiant efficiency and producing a spectrally predictable output. This simplifies bandpass filter selection for multi-analyte detection and ensures consistent output power 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; at the reduced operating point of the HIS2000R-C300-9, thermal management requirements are correspondingly relaxed. Modulation at up to 4 Hz supports synchronous lock-in detection for noise rejection and baseline stability. Continuous-wave operation is also supported for applications not requiring modulation.

• Broadband NDIR Gas Analysis: High-power detection of SO₂, NH₃, N₂O, CO₂, CO, CH₄, and organic compounds across 2–11 µm in stationary analysers where the reduced drive level of the -C300-9 is matched to the optical path length and detector sensitivity of the instrument.
• Thermally Constrained Mid-IR Instruments: Fixed-installation analysers targeting the 6–11 µm fingerprint region where enclosure thermal budget or power supply capacity makes the 50 mW output reduction of the -C300-9 versus the -C300-6 an acceptable trade for reduced heat generation.
• Long-Life Field Deployments: Instruments requiring extended service intervals in remote or inaccessible locations, where reduced filament operating temperature and lower thermal cycling stress on the CaF₂ window bond contribute to longer expected service life.
• Environmental and Emissions Monitoring: Outdoor CEMS and atmospheric monitors measuring SO₂, NH₃, N₂O, and other mid-infrared species in the 6–11 µm band, with hermetic sealing for permanent outdoor installation and CaF₂’s moisture resistance providing additional window durability.
• Industrial Process Gas Analysis: Fixed-point and extractive gas monitors in chemical, petrochemical, and pharmaceutical manufacturing targeting species with absorption features across the full 2–11 µm range, where power-efficient operation is a facility design requirement.
• Medical and Clinical Gas Analysis: Anaesthetic agent monitors and multi-gas respiratory instruments requiring mid-infrared coverage to 11 µm in sealed configurations, where instrument power budget or thermal management constraints favour the -C300-9 drive level.
• Scientific Research Instrumentation: Laboratory spectrometers, gas reference cells, and optical bench experiments requiring a stable, hermetically sealed 2–11 µm source, where 730 mW is sufficient for the optical path and reduced power consumption is advantageous.

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 industrial 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