wtw Turb 355 IR/T, Operating Manual

Page: 19 / 44

Operation
59
Note
To keep the drift as low as possible, the time for indexing the
cuvette while pressing and holding the
1
key is limited to
30 or 60 seconds. After this time the turbidimeter
automatically starts the measurement or calibration.
5 Make sure that the outside of the cuvette is clean,
dry, and free of fingerprints.
6 Insert the cuvette in the cuvette shaft so that it clicks
into place.
7 Align the cuvette:
Slowly rotate the cuvette by one complete rotation
(by 360 °) in small steps and hold the
1
key
depressed while doing so. After each step, wait for a
moment until the display is stable. Watch the display
of the turbidimeter while you rotate the cuvette.
Subsequently, turn the cuvette to the position with the
lowest displayed value.
8 Leave go of the
1
key.
9 Dashes are displayed while the measured value is
being determined.
10 Read the measured value when it is displayed.
11 Repeat steps 2 to 9 for further samples.
CAL ERR
1 3
2
4
4 2 8 3
NTU
FNU