Guidelinesfor Photometric Measurements - Tintometer Lovibond MD200 Instrucciones

GB Methods
0.0.0
Zero
Test
RANGE
RESULT
Zero
Test
Zero
Test
Guidelines for photometric measurements
1. Run samplesand blanks with the same batch of vials.
The blank is stable when stored in the dark and can be used for further measurements
with vials from the same batch.
2. Don't place hot vials in the adapter. Allow the vials to cool to room temperature for
minimum 45 minutes. It is recommended to leave the vials to cool over night.
3. Suspendedsolidsin the vial lead to incorrect measurements.Forthisreason it isimportant
to place the vials carefully in the adapter. The precipitant at the bottom of the sample
should not be suspended.
4. Clean the outside of the vials with a towel to remove fingerprints or other marks .
5. Avoid spillage of water or reagent solution into the sample chamber becausethis can
lead to incorrect test results.
6. Contamination of the transparent cell chamber can result in wrong readings. Check at
regular intervals and – if necessary– clean the transparent cell chamber using a moist
cloth or cotton buds.
7. Largetemperature differences between the instrument and the environment can lead to
errors – e.g. due to the formation of condensation in the cell chamber or on the vial.
8. To avoid errors causedby stray light do not use the instrument in bright sunlight.
MD200_1a 08/2011
The display shows the following:
After zeroing remove the vial from the adapter.
Placethe sample in the adapter (Note 2–4) making sure that the
marks are aligned.
Press the [ZERO/TEST]key.
The "Range" symbol flashesfor approx. 3 seconds.
The result appears in the display.
LR-/MR-range: in mg/l
HR-range: in g/l
The result is saved automatically.
Tolerance: ± 3.5 % (full scale)
Repeating the test:
Pressthe [ZERO/TEST]key again.
New zero calibration:
Pressthe [ZERO/TEST]key for 2 seconds.
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