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X1-1-UV-3726 – UV-C Radiometer

The X1-1-UV-3726 radiometer enables the effectiveness of UV germicidal irradiation (UVGI) to be accurately determined for both low pressure mercury (254nm) germicidal lamps and UV-C LEDs.UV-C Radiometer for disinfection effectiveness and safety of UV-C LEDs and germicidal lamps

Description

UV-C Radiometer for disinfection effectiveness and safety of UV-C LEDs and germicidal lamps

The X1-1-UV-3726 radiometer enables the effectiveness of UV germicidal irradiation (UVGI) to be accurately determined for both low pressure mercury (254nm) germicidal lamps and UV-C LEDs. Additionally, the device has sufficient sensitivity to detect if undesired exposure poses a photobiological safety risk to users. UVGI is a sterilization method that uses UV-C light to break down microorganisms such as viruses and bacteria by altering their DNA and RNA, rendering them unable to replicate.

The germicidal effectiveness of UV-C radiation depends on its dose (µJ / cm2) and wavelength. The dose is determined by measuring the irradiance (µW / cm2) and duration of exposure. The effectiveness of germicidal activity is wavelength dependent with a maximum around 265 nm which makes the potential germicidal efficacy of available UV-C LEDs greater than 254 nm emission Hg lamps.

The X-1-1-UV-3726 radiometer measures UV-C irradiance over a very wide dynamic range to beyond 100 mW / cm² with a resolution of 0.0001 µW / cm². It is calibrated for its spectral responsivity from 250 nm to 300 nm. Wavelength dependent calibration factors given in 5 nm increments are incorporated for measuring UV LEDs with known nominal wavelength. Additionally, a 254 nm calibration is included for Hg lamps as well as a general purpose 260 nm to 290 nm calibration for non-specific UV-C LEDs.

The X1-1-UV-3726 offers sufficient sensitivity to check for safety compliance and the effectiveness of personal protection equipment (PPE) in accordance with the accepted occupational exposure limit to actinic UV (ICNIRP). This requires irradiance levels to be < 0.2 µW/cm2 at 254 nm and < 0.1 µW/cm2 at 270 nm over 8 hour’s exposure. The handheld meter provides a real time display of irradiance or dose and includes a peak-hold function. The device may also be operated via its USB interface. Each meter is supplied with a traceable calibration certificate from the Gigahertz-Optik laboratory.

Ultraviolet germicidal irradiation (UVGI) is a sterilization method that uses short wavelength light in the UV-C region (100 nm to 400 nm) to break down microorganisms such as viruses, bacteria, yeasts and fungi. The maximum effectiveness for germicidal activity is around 265 nm. The DNA and RNA of microorganisms absorbs the UV-C radiation, which causes changes in their structure rendering them unable to replicate. Microorganisms can be destroyed in a very short time if exposed to sufficiently high intensity UV-C radiation.

To ensure the germicidal effect, the UV dose must be checked. This is achieved by measuring the UV irradiance at the location of exposure using a UV radiometer.

In addition to checking the desired germicidal effect of high intensity UV radiation, the potential risk to skin and eyes from relatively low UV intensity must also be determined if there is the possibility of human exposure to the UV radiation. Carrying out both measurements with one device requires UV radiometers with a very large dynamic range.


Product description

UV-3726 Irradiance Detector for UV-C LEDs and low-pressure Hg lamps

The UV-3726 model offers all the properties and features of the UV-37 series detectors. They are specially designed for radiometric measurement tasks in the UV spectral region and have been proven in industrial and scientific use over many years.

The UV-3726 detector incorporates a photodiode that is only sensitive in the short-wave spectral range. In conjunction with additional optical filtering, only radiation in the specified spectral sensitivity range is measured. This combination enables the radiometric measurement of UV-C LEDs (Figure 2) and low-pressure mercury lamps (Figure 3). Selectable calibration factors for common UV LED wavelengths and low-pressure Hg lamps increase the measuring accuracy.

To measure the irradiance, the detector’s entrance optic is a diffuser with a cosine field of view, which must be positioned in the desired plane of measurement. The diffuser, optical correction filter and photodiode are pre-aged with UV radiation to significantly reduce the inevitable aging process that results from exposure to UV radiation. The UV-3726 detector shows very little aging effects even in intensive use. Any changes are recorded and corrected as part of the recommended annual recalibration.

The photodiode of the UV-3726 detector offers a strictly linear relationship between the measurement signal and the irradiance in the range from a few pico amps (10-12 A) to several micro amps (10-6 A). When connected to the Gigahertz-Optik X1-1-V02 meter (Figure 1) it provides a linear measurement range up to at least 1000 mW / cm² with a resolution of 0.002 µW / cm².


Calibration

Reliable measurements in absolute units require the calibration of the measuring device with traceability to national metrological institute (NMI) standards. Since 1993, the Gigahertz-Optik measuring laboratory has been accredited as a calibration laboratory by the PTB (Physikalisch-Technische Bundesanstalt) and the DAkkS (German Accreditation Body) for the measurement of spectral responsivity and spectral irradiance. Since then, all factory calibrations have been closely based on the calibration standards and quality management of the accredited calibration laboratory. Therefore, the factory calibrations of Gigahertz-Optik offer the highest possible level of traceability and have been accepted worldwide for many years.

In accordance with the requirements of individual industrial sectors, part of the measuring laboratory is accredited by the DAkkS as a DIN EN ISO / IEC 17025 test laboratory. As a result, Gigahertz-Optik can optionally offer a DIN EN ISO / IEC 17025 test certificate for the UV radiometer X1-1 with UV-3726 in addition to the factory certificate.

The UV-3726 detector is calibrated for its spectral responsivity. When performing a measurement, the nominal wavelength of the UV-LED or Hg lamp can be selected on the X1-1-V02 meter for highest precision. The meter offers several calibration options:

  •  An average calibration factor for measuring any UV LEDs in the spectral range
    from 260 nm to 290 nm.
  • A specific calibration factor for measuring low-pressure Hg lamps (at 254nm).
  • Eleven, wavelength dependent, calibration factors given in 5 nm increments from 250 to 300 nm for measuring UV LEDs with known nominal wavelength.

Measuring device X1-1-V02

The X1-1-V02 measuring device evaluates the signal from the UV-3726 detector and displays the measured irradiance in absolute units, mW / cm². The high-quality signal amplifier of the meter supports the very large dynamic range of the detector and thus offers a measuring range of up to 1000 mW / cm² with a resolution of 0.002 µW / cm². In addition to the irradiance, the dose can also be displayed in J / cm². The measuring device offers a ‘peak-hold’ display function. The ergonomic housing of the device with its two AA batteries supports mobile use. Alternatively, the measuring device can be operated via its USB interface with the available application software for PCs. A software development kit (SDK) enables the measurement device to be integrated into user-written software.

Specifications

General
Short descriptionUV radiometer for UV-C LEDs and low-pressure Hg germicidal lamps
Main featuresMobile measuring device with separate detector. Easy to use. Large measuring range for high radiation intensities for disinfection and low radiation levels for the evaluation of the UV radiation risk.
Measurement rangesFor UV LEDs from 250 nm to 300 nm and 254 nm  low pressure Hg lamps.
Linear measuring range from 0.02 µW / cm² to 1000 mW / cm² with X1-1-V02 meter.
typical applicationsUVGI for disinfection of air and surfaces
CalibrationCalibration of the spectral responsivity in 5 nm steps from 250 to 300 nm. Additional calibration factors for 254 nm and for the spectral range average, 260 to 290 nm.
Measurement Head
Broadband detectorUV detector for UV-C LEDs and low-pressure Hg germicidal lamps
Accessories
DisplayX1-1-V02 Handheld meter for display of irradiance mW / cm2 and dose J / cm2 with peak-hold function.

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