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4.
Replace the filter and repeat step 2
for a second rinse of the syringe and
storage container.
5.
Remove the filter from the syringe.
Remove the plunger from the
barrel. Replace the filter and fill the
syringe with approximately 50 mL of
deionized water. Filter the water into
the storage container and save this
turbidity-free water.
6.
Repeat Step 5 until the desired
amount of turbidity-free water has
been collected.
„ TESTING TIPS
1.
Samples should be collected in a clean glass or polyethylene container.
2.
Samples should be analyzed as soon as possible after collection.
3.
Gently mix sample by inverting before taking a reading but avoid introducing air
bubbles.
4.
For the most precise results, follow the recommended procedure for wiping a filled
tube before placing it in the meter chamber. Invert tube very slowly and gently three
times to mix the sample. Surround the tube with a clean, lint-free cloth. Press the cloth
around the tube. Rotate the tube in the cloth three times to assure that all areas of
the tube have been wiped. Place tubes in the chamber with the same orientation each
time.
5.
Discard tubes that have significant scratches and imperfections in the light pass
zones. (Central zone between bottom and fill line).
6.
When reading very low turbidity samples, do not use tubes or caps that have been used
previously with high turbidity samples.
7.
Use the averaging option for low level measurements of turbidity.
8.
The meter should be placed on a surface that is free from vibrations. Vibrations can
cause high readings.
9.
Turbidity readings will be affected by electric fields around motors.
10. Carbon in the sample will absorb light and cause low readings.
11. Excessive color in a sample will absorb light and cause low readings. The user should
verify if a certain level of color will cause a significant error at the level of turbidity being
tested. Use of the Ratiometric calibration curve is recommended for highly colored
samples.
12. Observe shelf life recommendations for turbidity standards.
13. Do not use silicone oil on tubes when testing turbidity with the 2020t/i BLE.
14. When testing at low concentrations use the same tube for the blank and the
sample.
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