Labsphere ILT2400 UVG UV Germicidal Irradiance Meter

Overview

The Labsphere ILT2400 UVG is a purpose-engineered, handheld UV germicidal irradiance meter designed for quantitative validation of ultraviolet-C (UV-C) disinfection systems operating within the critical 240–310 nm spectral band. It implements photometric measurement principles based on filtered silicon photodiode detection with spectrally weighted responsivity aligned to the IESNA Luckiesh and DIN 5031-10 action spectra for microbial inactivation. Unlike broadband radiometers, the ILT2400 UVG integrates a calibrated SED240/WBS320/W detector assembly—comprising a UV-transmitting optical filter stack and temperature-compensated photodiode—to deliver biologically relevant irradiance values (µW/cm²) and radiant exposure (mJ/cm²) that directly correlate with pathogen inactivation efficacy. This system meets the metrological requirements for routine performance verification in healthcare environmental services, HVAC UVGI installations, water treatment facilities, and laboratory biosafety cabinets—where regulatory adherence and audit readiness are non-negotiable.

Key Features

• UVGI-optimized spectral response (240–310 nm) validated against IESNA and DIN microbial action spectra
• NIST-traceable calibration with full ISO/IEC 17025:2017 accreditation documentation included
• 8-decade dynamic range (50 pA – 1 mA photocurrent) enabling seamless measurement from sub-nW/cm² ambient leakage to high-intensity UV-C arrays (up to 500 µW/cm²)
• Integrated 4.3″ capacitive touchscreen with real-time irradiance/dose trending, histogram display, and on-device data annotation
• Dual USB interface: USB Micro for high-speed data export and firmware updates; USB Mini for simultaneous charging and remote PC-based logging via DataLight III software
• Ruggedized portable enclosure with integrated tilt stand and 7-ft sensor cable—designed to minimize operator UV exposure during field measurements
• Automatic range selection, bias control (5 V reverse), and signal averaging algorithms ensure repeatability across variable source geometries and duty cycles

Sample Compatibility & Compliance

The ILT2400 UVG is validated exclusively for continuous-wave (non-pulsed) UV-C sources, including low-pressure and medium-pressure mercury vapor lamps, UVC LEDs (265–280 nm peak), and KrCl excimer lamps (222 nm). It is not suitable for pulsed xenon or flash-lamp systems. All detectors undergo individual spectral scanning and multi-wavelength calibration using NIST-traceable reference standards at certified wavelengths (e.g., 254 nm Hg line, 265 nm LED peak, 222 nm excimer output). The system complies with ANSI/IES RP-44-22 (Recommended Practice for UV-C Disinfection Systems), supports GLP/GMP audit trails through DataLight III’s secure user authentication and electronic signature features, and satisfies FDA 21 CFR Part 11 requirements for electronic records and signatures when deployed with appropriate IT governance controls. CE marking confirms compliance with EU EMC Directive 2014/30/EU (Class B immunity and emission limits).

Software & Data Management

DataLight III is a platform-independent desktop application (macOS 10.15+, Windows 10/11) providing comprehensive instrument control, real-time visualization, and traceable data archival. It enables synchronized multi-channel logging, dose accumulation with time-stamped start/stop triggers, statistical reporting (mean, SD, min/max), and export to CSV, PDF, or XML formats compliant with LIMS integration protocols. Audit logs record all user actions—including calibration resets, configuration changes, and file exports—with timestamps and operator IDs. Raw sensor current data (pA) and processed irradiance/dose values are stored separately to support reprocessing with updated weighting functions or alternative action spectra per evolving standards (e.g., CIE S 026:2019 or ACGIH TLV® updates).

Applications

• Validation of upper-room and in-duct UVGI air disinfection systems per CDC/NIOSH guidelines
• Commissioning and periodic verification of UV-C surface disinfection robots and mobile units
• Performance testing of UV-C water sterilization reactors in municipal and point-of-use applications
• Calibration transfer and cross-checking between primary UV-C reference instruments and field deployables
• Research into UV-C dose-response relationships for emerging pathogens (e.g., SARS-CoV-2, influenza A, drug-resistant bacteria)
• Supporting ISO 15858 (UV-C safety standards) and IEC 62471 (photobiological safety) compliance assessments

FAQ

Is the ILT2400 UVG suitable for measuring pulsed UV sources?
No. The ILT2400 UVG is engineered for continuous-wave UV-C emission only. Pulsed systems require specialized integrating sphere-based detectors with microsecond-level temporal resolution.
Does the system include a certificate of calibration?
Yes. Each unit ships with a NIST-traceable calibration certificate issued by an ISO/IEC 17025:2017 accredited laboratory, listing uncertainty budgets per wavelength and measurement condition.
Can the ILT2400 UVG be used outside the 240–310 nm range?
Not without recalibration. While the underlying SED240/WBS320/W detector may respond weakly beyond this band, its UVGI weighting function and calibration are strictly defined for 240–310 nm per IESNA and DIN specifications.
How often should recalibration be performed?
Annual recalibration is recommended under normal use conditions. More frequent intervals (e.g., quarterly) are advised in high-exposure environments or after mechanical shock or thermal cycling beyond operational limits.
Is DataLight III compatible with networked laboratory information management systems (LIMS)?
Yes. DataLight III supports automated CSV/XML export with configurable naming conventions and folder structures, enabling direct ingestion into most modern LIMS platforms via scheduled file watchers or API-driven middleware.