17. When the value on the display
matches the concentration of the
turbidity standard, press the *IOK
to select Set.
Calibrate
00.50
*Set q
16:02:19 01/04/05
Or press press *IOK to return
the meter to the default setting.
Calibrate
01.15
* Default p
16:02:19 01/04/05
18. Press *IOK to proceed to Turbidity
analysis. Press OFF to turn the meter
off or press to exit to a previous
menu or make another menu
selection.
Note: The meter will remember the last scanned blank reading. It is not necessary to
scan a blank each time the test is performed. To use the previous blank reading,
instead of scanning a new one, scroll to Scan Sample and proceed. For the most
accurate results, the meter should be blanked before each test and the same tube with
tubepositioningringshouldbeusedfortheblankandthereactedsample.
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.
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.
CALIBRATION & ANALYSIS • TURBIDITY 47
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