Hanna Instruments HI 83210-01 - Manual (Page 46)

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The instrument shows clear warning messages when erroneous conditions appear and when measured values are
outside the expected range. These messages are described below.
No Light: The light source is not functioning properly.
Light Leak: There is an excess amount of ambient light reaching the
detector.
Inverted cuvettes: The sample and the zero cuvettes are inverted.
Battery Low: The battery capacity is lower than 10%.
Light Low: The instrument cannot adjust the light level. Please check
that the sample does not contain any debris.
ERRORS AND WARNINGS
Light High: There is too much light to perform a measurement. Please
check the preparation of the zero cuvette.