|
Surface
active agents like surfactants are generally showing a
specific turbidity behaviour. The classic method to determine
turbidity is by visual observation, but the visual method is
inaccurate and time consuming.
For
such applications the development of the turbidity analyzer
TURBITRONIC is a fundamental improvement regarding accuracy,
reproducibility, efficiency and cost savings. In addition to
this, severe errors in case of unknown phenomena like for
instance dragging turbidity or opacity, can be avoided by
automatic turbidity measurements.
In
principle, the method is based on automatic turbidity
detection by light transmission. Infrared light is transmitted
through the sample under test and is detected by a highly
sensitive photoelectric sensor on the opposite side. The
intensity level on which turbidity is detected can be adjusted
over a wide range.
In
many cases, not only cloudpoint measurements but also
clearpoint measurements can be of interest. By a smart
temperature program the TURBITRONIC is capable to determine
both cloudpoints and clearpoints
fast and accurately.
Variable
heating and cooling rates can be achieved by accurate
electronic temperature control within the entire range of -15°C
up to +90°C.
The
test procedure can exactly be arranged to comply to the
international test standards (DIN, ISO, ASTM) for turbidity
testing of various liquids.
This
method complies also to the DIN/EN 1890 and ISO 0607 standards
and improve precision, repeatability, reproducibility and
effectiveness of this test method.
Zero
and span of the measuring range can be calibrated by turbidity
standards (for instance Formazin).
Furthermore,
the sensitivity of the turbidity sensor can be checked
regularly in order to assure the accuracy and reliability of
the instrument.
Alternatively,
turbidity measurements can be carried out in relation to as
user definied standard (ratio-method). This kind of turbidity
measurements is much more difficult by visual comparison.
Technical
Data
|
Overall
turbidity range
|
10
... 1000 NTU
|
|
min.
value of turbidity change
|
10
NTU
|
|
Turbidity
calibration
|
min/max
levels by turbidity standard (Formazin) or by automatic
calibration
|
|
Reproducibility
|
±
0.1 °C
|
|
Standard
Temperature range
|
-5
... +80 °C
|
|
Optional
Temperature range
|
-15...
+90 °C
|
|
Temperature
accuracy
|
±
0.3°C (auto calibration)
|
|
Stirring
Speed
|
200
... 1000 rpm
|
|
Glass
test tubes
|
22
mm diameter, 200 mm length
|
|
Volume
of test sample
|
20
ml
|
|
Real
time clock
|
date
and time for printout and computer data
|
|
Computer
interface
|
RS232
|
|
Printer
interface
|
Parallel
centronics
|
|
Mains
voltages
|
200
... 250 V/50 Hz
100
... 120 V/60 Hz (optionally)
|
|
Guarantee
|
2
years
|
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