Hach Pocket Colorimeter II Single Wavelength Manuel D'utilisation page 26

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Most laboratory detergents are used at recommended concentrations.
Neutral detergents, such as Liquinox, are safer to use when regular
cleaning is necessary. To decrease the cleaning times, increase the
temperature or use an ultrasonic bath. To complete the cleaning, rinse
a few times with deionized water and then let the sample cell air dry.
Sample cells may also be cleaned with acid, followed by a thorough
rinse with deionized water.
Note: Always use acid to clean sample cells that were used for low-level metal
tests.
Special cleaning methods are necessary for individual procedures.
When a brush is used to clean sample cells, take extra care to avoid
scratches on the interior surfaces of the sample cells.
Replace the batteries
Replace the batteries when the battery power level is low. Refer to
Install the batteries
Troubleshooting
Error Description
E-0 No zero
E-1 Ambient light error
E-2 LED error
E-6 Abs error
26 English
on page 7.
In user calibration mode, a standard solution
was measured before the instrument zero
was set. Measure a blank solution to set the
instrument to zero.
1
There is ambient light in the cell holder. Make
sure that the instrument cap is fully installed
over the cell holder.
1
The LED (light source) is out of regulation.
Replace the batteries. Make sure that the
LED in the cell holder comes on when
is pushed.
The absorbance value is not correct or the
user-entered calibration curve has fewer than
two points. Enter or measure the absorbance
value again.
Solution
or