• Send Us a Message
  • Free Shipping Over $90 On Most Orders

    Cart 0

    Gigahertz-Optik X1 Series Radiometer - UVC 254nm

    Please contact us for a quote on this item.

    UV-C disinfection, primarily from 254 nm low-pressure mercury lamps (also referred to as Ultraviolet Germicidal Irradiation UVGI), is an effective technique for the disinfection of air and surfaces. For example, it is being increasingly used in healthcare facilities to combat Healthcare Acquired Infections (HAI’s). UV-C lamps in the Heating Ventilation and Air Conditioning (HVAC) systems can prevent the transmission of airborne pathogens such as tuberculosis bacteria and influenza viruses. Portable UV-C lamp systems are used in the process of decontaminating patient rooms or surgical suites.

    To ensure the germicidal effect is maintained, particularly with respect to lamp ageing, the UV dose must be checked. This is achieved by measuring the UV irradiance at the location of exposure using a suitably qualified UV radiometer. Additionally, 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.

    The model UV-3725 offers all properties and characteristics of the UV-37 Series detectors. They were specially developed for radiometric measurement tasks in the UV spectral range and have proven themselves over many years in industrial and scientific use.

    The UV-3725 detector contains a photodiode with an optical band-pass filter, which is only sensitive in the effective spectral range of germicidal UV-C low-pressure mercury-vapor lamps.

    To measure the irradiance, the input optic of the detector is a diffuser with a cosine field of view, which must be positioned in the desired measurement plane. The diffuser, the optical correction filter and the photodiode are pre-aged with UV radiation to significantly reduce the inevitable aging process resulting from exposure to UV radiation. The UV-3725 detector therefore shows very little aging effects even when used intensively. Changes are recorded and corrected as part of the recommended annual recalibration.

    The photodiode of the UV-3725 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 a Gigahertz-Optik X1 optometer, it offers a linear measuring range of up to at least 2000 mW / cm2 with a resolution of 0.001 µW / cm2.


    Reliable measurements in absolute units require the calibration of a measuring device with traceability to the standards of a National Metrology Institute, NMI. The Gigahertz-Optik measuring laboratory has been accredited since 1993 by the PTB (Physikalisch-Technische Bundesanstalt) and the DAkkS as a calibration laboratory for measuring spectral sensitivity and spectral irradiance. Since then, all factory calibrations have been closely based on the calibration standards and quality management of the accredited calibration laboratory. The factory calibrations from Gigahertz-Optik therefore offer maximum traceability and have been recognized worldwide for many years.

    According to the requirements of individual industrial, research and healthcare sectors, part of the measuring laboratory is accredited by the DAkkS as a test laboratory according to DIN EN ISO / IEC 17025. For this reason, in addition to the factory certificate, Gigahertz-Optik can optionally offer a DIN EN ISO / IEC 17025 test certificate for the UV radiometer X1-1 with UV-3725.

    Each UV-3725 detector is individually calibrated for its spectral irradiance responsivity at 254 nm.

    X1 Optometer

    The measuring device X1 evaluates the signal from the UV-3725 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 > 2000 mW / cm2 with a resolution of 0.001 µW / cm2. In addition to the irradiance, the dose can also be displayed in mJ / cm2. The meter has 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 meter to be integrated into user-defined software.

    Entrance Optic8 mm ∅ diffuser
    TypeUVC / UVGI
    Typical Range (max)2000 mW / cm2
    Typical Range (min)0.004 µW / cm2

    ProLampSales Order Code6191442100424

    There are currently no videos for this product.

    Optional Parts & Accessories

    Possible Alternative/Equivalent Products

    Shipping Policy

    Expedited Shipping Rates

    For expedited shipping, please contact us for a price quote and cutoff times.

    Continental United States

      • Most Orders Over $90.00 Ship Free
      • Shipping for other orders is calculated at checkout

    Certain restrictions apply, including oversize, heavy objects, and some fixtures/equipment.

    Alaska & Hawaii

    • Shipping calculated at checkout

    US Territories

    • Contact us for a quote.

    International Shipping

    Contact us for a quote. We do not ship most glass bulbs and fixtures internationally. If you have your own UPS/Fedex/DHL account, we may be able to ship using that.

    Shipping to US-Based Freight Forwarders

    For shipments to freight forwarders, we are only responsible for shipping to the freight forwarder directly. Please have your freight forwarder check your items for damage. We are not responsible for shipping damages incurred after the items leave the freight forwarder.

    Business Office Hours

    We can be reached by phone (800-784-1998) weekdays from 7:30am to 5pm Pacific Time.

    Our business office is closed Saturday and Sunday throughout the year, Memorial Day, 4th of July, Labor Day, Thanksgiving day, Christmas day and New Year's day.

    Orders can be placed on the website at anytime - 24/7.

    California Title 20 Notice

    Certain general service lighting products are no longer allowed to be sold in California. We make every attempt to inform you before purchase which items are unable to ship to California. If we discover an item you purchased can not be shipped, we may have to cancel the order. We apologize for any inconvenience this causes. Please contact your state representative for more information.

    California Prop 65

    California Prop 65 WarningWARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

    Returns Policy

    Returns are sometimes necessary. Our policy is to provide you with a hassle-free return experience.

    Accepted Returns

    Items Damaged in Shipping

    If the product was damaged during shipping, first keep all packing materials, then call or email us to report the damage. Damage must be reported with 3 days of you receiving the shipment. We will have you return the product using the Returned Material Authorization (RMA) we will provide. We will send you a new product or provide a full refund and we will reimburse you for any shipping charges you may incur.

    Missing Items

    If all the items you ordered are not in the shipment, call us within 3 days of receiving the shipment so we can promptly send the missing item(s).

    Wrong Product Ordered or Product No Longer Needed

    If you ordered the wrong product call or email us so we can help you get the correct product. If the product purchase error was in no way the fault of information provided on ProLampSales.com, you are responsible for the return shipping cost and a 25% re-stocking fee.

    Returns After 30 Days

    Items ordered from ProLampSales can be returned within 30 days of receipt of the shipment in most cases. Please check that all of your items are present and in working condition within this timeframe.

    After 30 days, if the product does not perform to specifications or fails within stated warranty periods, see manufacturer warranty information for procedures to follow.

    Products that Differ from Our General Return Policy

    International Orders

    International orders are non-returnable.

    Gas Detectors & Air Quality Monitors

    For safety reasons, we do not accept returns on gas detectors or air quality monitors. Once these products leave our warehouse, we can not be sure what environments they are used/stored in or what dangerous gases or pollutants they are exposed to.

    Larson Electronics

    Larson Electronics UVC lighting products of any kind are non-returnable. Larson Electronics orders are subject to a minimum 15% cancellation fee. If you need help with a product, please contact us before ordering or verify that you are ordering the correct item.


    Non-Quick Ship Soraa brand products are non-returnable. If an error was made in order fulfillment or shipping, replacements may be sent out or a refund issued.