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NOTE
The instrument provides a Quick Zero function.
With this the zero adjustment is performed for
all wavelengths which are used with all
Spectroquant
test kits. This function can be
®
activated via "System (Instrument settings)" –
"Quality".
4.3.1
Notes on Zero Adjustment
Zero adjustment with round cells
•
Only use clean, scratch-free round cells and
distilled water.
The minimum filling level is 20 mm. A ready
zero cell is contained within the scope of deliv-
ery of the spectrophoto meter
•
A ready zero cell can, in principle, be used for
an indefinite period of time. We recommend,
however, that you regularly check the zero cell
for visible contamination and scratches and
refill or exchange it if necessary (at least every
24 months)
•
Insert the round cell until it touches the bot-
tom of the round cell compartment
Zero adjustment with rectangular cells
•
With rectangular cells, zero adjustment must
be carried out using the same cell type (manu-
facturer and cell material [e.g. optical glass,
quartz glass, plastic]) as the one that will
be used for measurement. This is important
because cells of different manufacturers have
different absorption characteristics. When
changing the cell type, repeat the zero adjust-
ment with the new type
•
Prior to zero adjustment, clean the rectangular
cell and fill it with distilled water. The minimum
filling level is 20 mm
•
Rectangular cells always have to be inserted
in the cell compartment with the same orien-
tation for measurement and zero adjustment
(e.g. cell inscription always on the left side)
•
Insert the rectangular cell until it touches
the bottom and left edge of the holder. The
opaque sides of the rectangular cell must point
to the front and rear
Version 1.0 – 07/2023
4 Operation –
4.3 Zero Adjustment for preprogrammed methods
4.3.2 When to repeat the Zero
We recommend that you repeat the zero
adjustment in the following cases:
•
If the spectrophotometer was subject to me-
chanical stress such as strong shock or trans-
port
•
If the ambient temperature has changed by
more than 5 °C since the last zero adjustment
•
At least once a week. The interval to repeat a
zero adjustment is set in the instrument to 7
days. You can change this under "System (In-
strument Settings)"
•
If a new cell type (different manufacturer, dif-
ferent glass type) is used
•
Basically, each time you want to measure with
the highest possible accuracy
NOTE
If an interval to repeat a zero adjustment is set
you will be prompted to repeat it after the inter-
val has passed. You can also repeat a zero ad-
justment by selecting a method, then touching
the "Settings" icon. Choose "Zero adjustment"
and insert a zero cell to start the measurement.
Adjustment?
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