Hanna Instruments HI 83216-01 - Manual (Page 32)

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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 bellow.
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.
ERRORS AND WARNINGS
• Remove the cuvette and add 5 drops of HI 93710-0
Phenol Red Indicator. Replace the cap and mix the
solution.
• Reinsert the cuvette into the instrument.
• Press the Read key to start the reading. The instrument displays the pH value.