UV Light Monitor 7640

It is recognised that a major cause of damage to museum works of art can be light, with the most damaging being the UV content. To enable curators and conservators to monitor these levels we offer a proven range of instruments. These meters measure proportion of UV present (µW/Lumen), the total amount of UV (µW/M²) and the amount of visible light present (Lux). The amount of UV should be as little as possible and in general should not exceed 20µW/M² or 75µW/Lumen. Normal museum light levels should be limited to 150-250 Lux. Once measurements have been observed action can be taken, light levels altered, if necessary UV filters fitted to display cases, windows and fluorescent tubes.

The UV light monitor 7640 will measure UV present (µM/Lumen) the amount of UV (µM/M²) and the amount of visible light present (Lux or Foot-candles) similar to the 684-764 but without humidity and temperature sensors.

• Visible wavelength range: 400-700nM
• Visible power range: 0.1 - 200,000 Lux (0.1 – 20,000 foot-candles)
• UV wavelength range: 300-400nM
• UV power range: 2-50,000 mW/M²
• UV proportion range: 0-10,000 µW/Lumen
• Display resolution: Lux: 0.1 to 100 then 1
                              Foot-candles: 0.1 up to 100 then 1
                              UV: 0.1 up to 100 then 1
                              Proportion of UV: 1 µW/Lumen
• Accuracy: Visible: 5% ± 1 displayed digit
                  UV: 15% ± 1 displayed digit
• Angular response light & UV: Cosine
• Batteries: 2 x alkaline AA type
• Dimensions: 150 x 65 x 25mm
• Weight: 165g with batteries