17
OPERATIONAL GUIDE
Sources of Interference
• Presence of floating debris and coarse sediments which settle out
rapidly will give false readings.
• The infrared light source used for HI93703-11 turbidity meter,
complies with the ISO 7027 International Standard and can
effectively minimize any errors due to colored dissolved substances.
This effect, called “true color”, is a common interference for most
commercially available instruments operating in the range of
visible light.
• Air bubbles and the effect of vibrations that disturb the surface of
the sample may give false results and should be avoided.
• Dirty glassware could also affect readings along with scratched or
dented vials.
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