Usable Cells - wtw photoLab 7100 VIS Operating Manual

®
photoLab 7100 VIS
ba77095e03 10/2017
Line mark
Inner
turn-up lid
4.2.5

Usable cells

Depending on the wavelength range, different kinds of cells are suitable.
Apart from round cells, all rectangular cells made of glass, quartz or plastic
with opaque lateral surfaces are suitable (see section 8.1). Cells with clear or
serrated lateral surfaces are not reliably recognized by the automatic cell rec-
ognition.
Especially with plastic single-use cells we recommend you test them for suit-
ability prior to carrying out large-scale series of measurements.
For measurements in the UV range below 320 nm, glass cells and commer-
cial PS plastic cells are not suitable; below 280 nm, commercial PMMA plas-
tic cells are not suitable due to their transmission characteristics. Therefore,
use quartz cells or tested single-use cells (plastic) for applications in the UV
range.
1 Open the cell shaft cover.
Barcode
2 Insert the AutoSelector in the
round cell shaft so it touches the
bottom. When doing so, align the
line mark with the notch at the
front of the round cell shaft.
– The photometer selects the cor-
With methods without AutoSelec-
tor: Select the method manually in
the instrument.
3 Open the inner turn-up lid.
4 Insert the rectangular cell verti-
cally so it touches the bottom and
left edge of the cell shaft. The
opaque sides of the rectangular
cell must point to the front and
back.
If an AutoSelector is used, the cor-
rect measuring range is automati-
cally selected when the
rectangular cell (1, 2, 5 cm) is
inserted.
The photometer has an external
light recognition. If there is too
much external light, a message
prompts you to close the cell shaft
cover.
rect method with the aid of the
barcode.
Operation
23