Section 2 General Information; Applications; Measuring Principle; Handling - Hach LANGE ULTRATURB sc Operating Instructions Manual

Section 2

2.1 Applications

2.2 Measuring principle

2.3 Handling

General information
ULTRATURB sc bypass sensors are innovative precision turbidity measuring
instruments developed using the latest technical findings. Turbidities in the range
of FNU (NTU) 0.0001-1000 are measured and displayed alphanumerically using a
controller. This high resolution facilitates precision differentiation, even for ultra
clear liquids.
A pulsed, long-life IR radiation source (LED) ensures that costs are minimised.
ULTRATURB sc turbidity sensors are designed in accordance with DIN EN ISO
7027 and are permanently calibrated before leaving the factory. All key data is set
to practical standard values.
The instruments are immediately ready for use after connection to the power
supply and the supply of sample water. The measuring range and all data outputs
are modified to suit requirements using menus on the controller (Sec. 5).
All optical and electronic assemblies are installed in housings that are physically
very strong and proof against water jets.
ULTRATURB sc turbidity sensors are available in the classic version and
the convenient "plus" version.
The measuring chamber of the ULTRATURB sc plus also has automatic wiper
cleaning that reliably prevents soiling of the optical system as it starts to build up
and significantly reduces the user maintenance. Cleaning is performed at an
interval set to suit local requirements. The cleaning intervals are adjusted to suit
the expected level of soiling during commissioning. The user can straightforwardly
change the interval at a later date. The number of cleaning operations already
performed can be checked on the SENSOR-SETUP menu using the COUNTER
command.
The nephelometric scattered light technique is a method for the determination of
the very low to medium turbidities in liquids that is comparable worldwide.
Using this method, the light scattered sideways by the turbidity particles is
measured over an angle of 90°. The low acquisition limit for this method makes it
possible to even reliably differentiate turbidity particles in distilled water. This
technique is defined in DIN EN ISO 7027. ULTRATURB sc sensors are designed
in accordance with the requirements in this standard.
The sensor contains high-quality optical and electronic assemblies. For this
reason attention is to be paid to ensuring that the sensor is not subjected to any
hard mechanical knocks. There are no components that can be maintained by the
user inside the sensor or the display unit - except the manual cleaning of the
measuring chamber and the replacement of the wiper profiles and the desiccant.
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