ALTANA LCM plus - Manual (Page 8)

BYK-Gardner GmbH LCM plus 235 017 133 DE 0302
37
B5 Turning-Off
LCM plus turns off automatically by a timer function. Manual turning-off is possible, too.
Manual Turning-Off
Press Cursor-Key in the measuring menu and select option
„Switch Off“ with the OK-key. Then the instrument turns off.
Turning-Off Via Timer
On delivery, the timer of LCM plus is set to automatical turning-
off time of 30 minutes. The automatical turning-off is only
active if no measurement was made within the given period
and no cuvette is in the compartment. The setting can be
modified within the tolerances of 10 to 60 minutes (cp. C8.2).
B6 Photometric Preparation
The photometric preparation requires utmost care, because careless sample preparation is the
major source of trouble, and not the handling of the instrument itself.
Cleanliness is of vital importance in photometry. Therefore, clean the glass cuvettes immediately
after use. Employ only optically perfect samples for measuring. They must be clean and not show
any signs of opaqueness.
Air bubbles in the sample or at the cuvette sides influence the measuring result. They can be
avoided by filling the liquid slowly into the cuvette. Pasty or solid products should be melted and
filled-in without bubbles, if they cannot be measured as they are.
B6.1 Sampling And Sample Preparation
Take a sample from the product you want to measure in accordance with DIN 53242 part 1.
Eliminate turbidities by heating or filtration. Heat partly solid samples before measuring in order to
dissolve the solid share in the liquid one. The preparation must not cause any chemical changes in
the sample. During the measurement there should be no bubbles in the sample.
6
•
There are several cuvette types available for colour measurement with LCM plus,
differing by material (glass, polystyrene or PMMA 7 ) and path length (11mm and 50mm).
•
The program calculates automatically Iodine, Hazen, Gardner, Saybolt and ASTM D 1500-
numbers under consideration of the cuvette type employed.
•
For the 11mm disposable round glass cuvettes, a dry thermostat is available to warm up
to 15 cuvettes to 100°C or 148°C.
6 Acc- to DIN 6162, ed. 12.81, para. 5 a. 6
7 Polymethylmethacrylate
LCM plus
V1.05
14:50
17.02.00
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