2.4.3 Box Colors
The measurement boxes can have different colors: green, brown, gray, blue or black.
When the color of the box is green, then the measurement is stable and reliable, provided that the
result bar is white and no prefixes appear.
If the box is brown, then the measurement is not yet stable. Usually, it takes at least a minute before
a measurement is adequately stabilized. In which case, the box will turn green. Some sensors simply
need more time before the measurement is stabilized, but it could also be caused by the age of the
sensor or a notably large change in the concentration between samples (from high to low).
If the dot in the upper left corner is gray, then the concentration of the sample solution is above or
below the measuring range of the sensor. In the case the concentration of the sample solution is too
high, you could dilute it to bring it within the measuring range.
If the dot is blue, then the relevant sensor is old or is otherwise working poorly. It is also possible that
something went wrong with the multi-point calibration. In which case, you should repeat the
calibration procedure. Sensor sensitivity decreases with age. This will be noticed during the multi-
point calibration. The sensor is working but should be replaced as soon as possible.
If the dot is black, then the relevant sensor is defective. It is possible, that something has gone
wrong during the multi-point calibration. In which case, you can simply repeat the calibration
procedure to correct the problem. However, if the sensor is truly defective, it will no longer give
measurement results. Please contact your dealer for a replacement.
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