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Macro 900 Operation Manual
V3
© 2013 Palintest Ltd.
www.palintest.com
Page 10 of 147
All Palintest Optical Electrodes are incredibly sensitive. For example,
the Turbidity electrode is capable of measuring between 0 and
3000NTU with an internal resolution of greater than 0.1NTU. This
means that the electrode is able to detect changes in turbidity that is
less than 0.003% of the full range! The other optical electrodes have a
similar level of sensitivity.
It follows, therefore, that in order to provide stable, repeatable readings, the
environment in which the measurements are made must be completely stable
and repeatable.
For this reason, the MAP
2000/2100 is constructed
with a matt black aluminium
sleeve and end cap that
enclose the sensing
electrodes and provide a
closed, constant condition,
non-reflective measurement
chamber.
This is essential for the
correct calibration and
operation of all types of
optical electrodes.
A diagram of the MAP
2000/2100
’s measurement
chamber is shown here.
In order to obtain consistent results, the measurement chamber
created must remain physically constant during both calibration and
measurement.
If the optical electrode is calibrated under one set of conditions then used to
measure under another set of conditions, the readings will naturally be
erroneous, especially at low concentrations.
A perfect example of this is calibrating with the end cap removed then
measuring with the end cap fitted (or vice-versa). By changing the physical
characteristics of the measurement chamber, you also change the calibration
and response of the electrode.