Since 2022, the measurements of ground-based solar UV-VIS irradiance are performed at four sites in Belgium. The CSV resource contains the locations.
List of the BIRA-IASB instruments available on the stations:

Spectrometer - Only installed in Uccle/Ukkel: Double monochromator for global solar spectral UV-VIS irradiance measurements
Spectral coverage: 280 nm to 500 nm. Time sampling: 15 minutes.
Spectral sampling: 0.5 nm. Spectral resolution: 0.58 nm

Available on all sites:

UVA pyranometer - Calibrated to provide:
Global solar UVA irradiance. Wavelength integration: 315-400 nm and 320-400 nm Time sampling: 1 minute (or better: down to 3s)

UVB pyranometer - Calibrated to provide:
UV index measurements
Global solar UVB irradiance. Wavelength integration: 280-315 nm and 280-320 nm
Time sampling: 1 minute (or better: down to 3s)

Total Solar Pyranometer (TSP) - Calibrated to provide: Global solar irradiance. Wavelength integration: 300 - ~2800 nm Time sampling: 1 minute (or better: down to 3s)

Multi-channel filter radiometers (GUV-2511) manufactured by BIOSPHERICAL Inc - Global solar irradiance at the following wavelengths: 305 nm, 313 nm, 320 nm, 340 nm, 380 nm and 395 nm, as well as Photosynthetically Active Radiation (PAR - 400-700 nm)
Bandpass: typically 10 nm for UV channels
Side product: UV index obtained from a linear combination of UV channels
Time sampling: 1 minute