Hach-Lange ULTRATURB sc basic_plus_seawater - Manual (Page 8)

8
General information
2.2 Applications
ULTRATURB sc bypass sensors are innovative precision turbidity measuring
instruments developed using the latest technical findings.
ULTRATURB sc bypass sensos are developed primary for waste and drinking
water applications. The very robust seawater version is developed especially for
seawater applications with high salt concentrations (e.g. drinking water
abstraction from seawater, fish farming or seawater aquariums).
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.
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 basic version, the
convenient plus version and the robust seawater version.
The measuring chambers of the ULTRATURB plus sc and of the
ULTRATURB seawater sc also have automatic wiper cleaning that reliably
prevents soiling of the optical systems 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.
2.3 Measuring principle
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.
2.4 Handling
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.