Please read the following instructions carefully because these must be strictly observed to
ensure accurate measurements:
The cuvette lid, the cuvette itself and the stirring rod (if used) must be clean, to ensure that the
samples to be tested are not contaminated by dirt, residues or remaining reagents of a previous test.
Always close liquid- and powder reagent containers immediately after use.
Air bubbles on the inside of the cuvette wall will result in incorrect measurements!
Always conduct baseline (zero) measurements with the same cuvette used for the subsequent test.
Always make sure that the triangular marking on the cuvette is aligned with the triangle on the front
of the sampling chamber on the device. There are always small differences between cuvettes
(tolerances due to production).
Any soiling must be cleaned properly.
Check before each test-run that the reagents used have not exceeded their best before date.
Some reagents are classified as hazardous materials. These are identified as such on the
packaging. In addition you can download safety datasheets for the reagents offered from
https://msds.water-id.com.
If there are any bubbles, carefully shake/tap the cuvette to release these.
Always keep the sampling chamber (behind the cuvette adapter) clean. On 4 sides of the chamber
you will see small holes behind the transparent chamber. The LEDs and sensors are located behind
these holes. All transparent parts in front of these must be dry and clean.
It is best to always use the same cuvette for any single parameter and to mark the cuvette on the
outside on the bottom with a waterproof marker accordingly for this particular parameter.
Always adhere to the safety instructions on the packaging and in the safety specifications to prevent
damages to yourself, the device and the environment.
The cuvette must also be free of any scratches as these would divert the light ray transmitted during
the test. Replace any scratched or damaged cuvettes with new ones.
Make sure that you use only photometer grade reagents (PL range and Photometer tablets). Using
RAPID reagents will lead to incorrect results!
Before inserting the cuvette into the sampling chamber please ensure that the cuvette is absolutely
dry and clean, that there is no soiling by fingerprints etc., so that the light ray transmitted by the
device for testing is not refracted or blocked. It is best to wipe the outside of the cuvette with a soft,
clean and dry cloth before inserting it.
Never clean cuvette, lid or stirring rod with a detergent as these will leave residues and could
influence any subsequent tests.
NEVER touch reagents with your fingers, pour them directly from the container into the water
sample!
Always ensure uniform drop sizes / powder-spoon-sizes are used.
42
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