palintest Ammonia Duo, Руководство пользователя

Страница: 8 / 26

8
It is interesting to note that the filter that gives the most
sensitive calibration for a test factor is the complementary
colour of the test sample. For example, the DPD chlorine
test produces a pink colour proportional to the chlorine
concentration in the sample (the greater the chlorine
concentration, the darker the pink colour). In this case, a
green filter gives the greatest sensitivity as a pinkish-red
solution absorbs mostly green light.
Palintest photometers calculate and then display the test
results directly in milligrams per litre (mg/l) of the test
factor, by comparing the amount of absorbed light to the
calibration data programmed into the instrument.
Photodetector
Blue Solution
(450 - 500nm) Red Filter
(625
– 635nm)
Red light only passes
through the filter. All
other light is absorbed.
Incident
Wavelengths of blue light
plus small quantities of red
light pass through the
solution.