Background: The GUV series has been manufactured by Biospherical Instruments since 1992. Originally, BSI sold the GUV-511. In 2003, it was retired in favor of the GUV-2511, which has wider dynamic range electronics and an expanded channel selection. GUV radiometers are used in several national and international monitoring networks (see references at the end of this page).

GUV-2511 Ground-based Ultraviolet Radiometer System

GUV radiometer installed at Palmer Station, Antarctica.The GUV-2511 Ground-based Ultraviolet Radiometer was specifically designed to measure cosine-corrected downwelling irradiance at 305, 313, 320, 340, 380, and 395 nm, as well as PAR (400–700 nm). Additional wavelengths are available (as options). Incorporating a custom interference filter with a "solar blind" detector to reduce red-leakage, the 305 nm sensor is designed to respond to the region of the UV-B spectrum strongly affected by atmospheric ozone concentration. Similarly, other UV sensors incorporate custom interference filters and sensitive silicon photodiodes to minimize errors associated with spectral leakage. 

To minimize on the measurement of diel temperature changes, the GUV-2511 features active internal heating to maintain the temperature of the optical elements at 40°C or 50°C, depending on the deployment site. 

Windows-based LOGGER software for data acquisition is included. 

The GUV-2511 radiometer is specifically designed to monitor UV radiation in key UV wavebands for biological exposure studies. These wavelengths allow the extraction of cloud optical thickness and total column ozone, two critical variables used in modeling the solar spectrum. The systems are designed to be easily deployed, either individually or in networks, to examine the geographic variability in UV exposure. Components include the GUV-2511, an AC-powered control unit, 50 m cable (GSC-2511/50), and Windows-based LOGGER software. 

Features

• Measurement:  7-channel surface UV and PAR cosine irradiance. 
• Spectral Response:  Individual filter photodiode (10 nm FWHM) channels at 305, 313, 320, 340, 380, 395 nm, and 400–700 nm (PAR). Other wavelengths are available.
• Weatherized, sealed, and controlled internal temperature to 40ºC or 50ºC. 
• Input Power:  85–264 VAC, 47–63 Hz-powered control unit ("deckbox") (not battery powered). 
• Output Signal:  Serial RS-232 (software supplied). 
• Subunits:  GUV-2511, deckbox, 50 m of cable, and software.

Options

• UV-552 Instrument Inclinometer for the GUV-2511
• UV-565 Travel Case: Fits a GUV system, deckbox, AC adapter charger and cable (up to 100 m); meets ATA requirements for checked baggage but may exceed 30 kg in weight. 

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References