Tintometer Lovibond TB210 IR, Instruction Manual

Page: 42 / 116

42 TB 210 IR_2a 01/2015
Matched sample vials are required to minimise the effects of optical variation from glass vial to
glass vial. Alternatively an indexed single sample vial can be used for every measurement.
Once vial orientation in the sample chamber is located, always use this new orientation mark
for all measurements independent of the white pre-printed triangle mark.
Indexing a single sample vial
1. Fill a clean and dry vial up to the mark with dilution
water (see chapter: Preparing Dilution Water).
2. Cap the vial.
3. Hold the vial by the cap and clean it with the supplied
cleaning tissue to remove water spots and finger
prints.
4. Switch the turbidimeter on.
5. Place the vial in the sample chamber.
6. Make sure that the marks are aligned.
7. Place the cover on the instrument.
8. Press [Read] key.
9. Note the displayed result.
10. Rotate the vial in the sample chamber about 45°.
11. Place the cover on the instrument.
12. Press [Read] key.
13. Note the displayed result.
14. Repeat this procedure until the smallest NTU value is
obtained.
15. Mark the vial at this point. Use this orientation mark
for all further measurements.
Note:
Assume the indication "Underrange" is equal to 0.00 NTU.
GB Indexing and matching sample vials