wtw Turb 550, Operating Manual

Page: 21 / 54

Operation
21
6 Align the cell (see 4.1.1 M
ARKING AND ALIGNING
CELLS
)
7 The turbidity value appears in nephelometric turbidity
units (NTU) on the display. The instrument automati-
cally selects the measuring range and resolution
8 If you want to measure and compare more than one
sample, press the key. The last measured val-
ue is stored and appears in the lower display line.
The upper display line continues to show the current
measured value. If the print function is switched on,
the value can also be output on the RS232 interface
by pressing the
key
9 Repeat steps 1 to 8 for all the samples
10 After measuring, always leave a cell plugged into the
instrument so that the optical shaft is protected
against dust.