HF scientific MicroTPW Field Portable Turbidimeters - Manual (Page 12)

MicroTPI & MicroTPW (5/10)
Rev. 1.9
6
3.1 Routine Measurement
Turn on the instrument by pressing the ON/OFF button for 1 second.
The following are the recommended steps to take a reading:
1. Sample approximately 100 mL of the process.
2. Obtain a clean and dry sample cuvette.
3. Rinse the cuvette with approximately 10 mL of the sample water (2/3 of cuvette
volume), capping the cuvette with the black light shield (cuvette top) and inverting
several times. Discard the used sample and repeat the rinsing procedure two more
times.
4. Completely fill the rinsed cuvette (from step 3) with the remaining portion
(approximately 15 mL) of the grab sample and then cap the cuvette with the supplied
cap. Ensure that the outside of the cuvette is dry, clean and free from smudges
1
5. Place the cuvette into the instrument and press it down until it snaps fully into the
sample well. Index the cuvette by pressing and holding down the
↵
button while
rotating the cuvette to identify the lowest reading (the displayed turbidity is
continuously updated on the display). Once the cuvette is indexed, release the
↵
button to display the measured turbidity (see Glossary for more information on
indexing a cuvette).
6. Repeat steps 1 through 5 for all samples.
Warning: NEVER pour liquid directly into the sample well of the instrument always use a
cuvette. The instrument will only accurately measure the turbidity of a sample
when cuvettes sealed with the black cap are used. The black cap serves as both
seal and a light shield.
Notes:
1. The instrument will turn off after approximately 5 minutes if no buttons are
pressed.
2. 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.
3. 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 (Kimwipes ®), to clean the outside of
the cuvette.