Turbimax CUS51D
Endress+Hauser 3
Sensor design The turbidity sensor CUS51D is equipped with two independing sensor units that are arranged in parallel. The
application-specific analysis of both signals results in stable measured values.
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Arrangement of the light souces and the light receivers
1,2 Light sources 1 and 2
3,5 135° light receivers
4,6 90° light receivers
This allows the optimal turbidity and suspended solids measurement:
• For low turbidity values preferably the 90° channel is used.
• For average and high turbidity values and for suspended solids measurement the 135° channel is used.
• The dual sensor technology allows operation with a large range of soiling compensation, e.g. suspended
solids measurement in the activated sludge basin (basis: four-beam pulsed light).
Based on the chosen application the appropriate model is used automatically inside the sensor.
Note!
The available sensor types differ in their measuring ranges and therefore in the selection of the available
applications.
Measurement methods Four-beam pulsed light method
The method is based on two light sources and four light receivers. Long-life LEDs are used as monochromatic
light sources. To eliminate interference from extraneous light sources, these LEDs are pulsed.
Two measuring signals are detected at the four light receivers. The eight measuring signals are processed in the
sensor and are converted into turbidity units and solids concentrations.
The four-beam pulsed light method compensates the sensor soiling as well as the wearing of the optical
components.
The number of the used signals depends on the application.
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Four-beam pulsed light method
S
1
S
2
Light sources
E
90
90° channel light-receiver
E
135
135° channel light-receiver
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