KBF-LQC (E5.2) 12/2010
page 75/106
16. Characteristic features of the light sensors
The sensors can be plugged inside the inner chamber what makes it easy to take them out for calibration
or replacement.
Intensity of illumination [LUX] and UV [W/m
2
] are measured by optical sensors inside chambers with ICH
illumination equipment (actual value display) and are temporally integrated (dose value display).
16.1 LUX sensor
Spectral sensitivity and spectral range are automatically determined with unity LUX. The relative spectral
sensitivity is the V-
λ
distribution according to the sensitivity characteristics of the human eye.
•
Display of the actual value in kLUX
•
Display of the dose: The value 1 equals an integrated illumination of 1 MLUXh. So values from 0 to
999.9 MLUXh can be displayed on a four-place display (0-999.9). A controller value of 1.2 equals 1.2
Mio. LUXh. With e.g., 11 kLUX it will thus take the dose display about 9 hours to increase by 0.1.
16.2 UVA sensor
The UVA sensors must consider the spectral range defined in ICH guideline Q1B, Option 2 as between
320 and 400 nm.
•
Display of the actual value in W/m²
•
Display of the dose: The value 1 equals an integrated illumination 1 Wh/m² (equaling 0.36 J/cm
2
). So
values from 0 to 999.9 Wh/m
2
can be displayed on a four-place display (0-999.9). A controller value of
200.0 equals 200.0 Wh/m
2
. With e.g., 7 W/m
2
it will thus take the display unit about 8.6 minutes to in-
crease by 0.1.
16.3 Spectral range
The spectral sensitivities of both sensors have been adapted to the spectral ranges defined in ICH guide-
line Q1B, Option 2.
Relative sensitivity
Relative sensitivity
Wave length in nm
Wave length in nm
Figure 28: Relative spectral sensitivities
