Turbimax CUE25 / CUE26
Operation
Hauser
11
4.3
Routine operation
"
Caution!
Never pour liquid directly into the sample well of the instrument. Always use a cuvette. The
Turbimax will accurately measure the turbidity of a sample using only cuvettes with the black light
shield on the cuvette (provided by Hauser).
Perform the following steps to measure the turbidity of a sample:
1.
Turn the instrument on by pressing the
key for 1 second.
2.
Sample approximately 100 ml of the process stream as you would normally do for turbidity
measurement.
3.
Obtain a clean and dry sample cuvette.
4.
Rinse the cuvette with approximately 10 ml of the sample water (2/3 of cuvette volume),
capping the cuvette with the black light shield cap and inverting several times.
5.
Discard the 10 ml of used sample and repeat the rinsing procedure two more times.
6.
Completely fill the rinsed cuvette with the remaining portion (approximately 15 ml) of the grab
sample and then cap the cuvette with the black light shield cap. Ensure that the outside of the
cuvette is dry, clean and free from smudges
1)
.
7.
Place the cuvette into the instrument and press it down until it snaps fully into the sample well.
8.
Index the cuvette to the lowest reading:
– Press and hold the
F
key.
– Rotate the cuvette slowly throughout one complete revolution (360°)
– While rotating the sample cuvette, observe the display and locate the position in which the
cuvette provides the lowest turbidity reading.
– This position is the indexed position of the cuvette.
9.
Once the cuvette is indexed, release the
F
key to display the measured turbidity.
10. Repeat steps 2 through 9 for all of your samples.
!
Note!
• The instrument will turn off after approximately 5 minutes if no keys are pressed.
• To minimize drift, indexing is allowed for only a short period of time. After this period, the
calibration or reading of the sample is automatically initiated.
• The value displayed during indexing is for the purpose indexing only. The final reading may vary
from the indexing value.
1)
Any typical glass cleaner can be used along with a lint-free cloth, or tissue, to clean the outside of the cuvette.
