
3.2 Operating instructions
Display
Meaning
Hi
Measuring range exceeded or turbidity too
high.
Lo
Measuring range undershot.
Change the batteries immediately, continuing
work impossible.
btLo
Battery voltage for background lighting too low,
although measurement is possible.
A1856
With a method adjusted by the user, when the
result is shown in the display, an arrow appears
in the
[Cal] position.
3.3 Error messages
Display
Meaning
E 27 / E
28 / E 29
Light absorption too great. Cause e.g. dirty optics.
E 10 / E 11 Calibration factor outside the permissible range.
E 20 / E 21 Detector receives too much light.
E 23 / E
24 / E 25
Detector receives too much light.
E 22
The battery power was too low during the measurement.
Replace the battery.
E 70
Cl: Factory calibration not OK / deleted
E 71
Cl: User calibration not OK / deleted
Operating Menu
16