Watersampling - Turbidimeter surface water 

Page / - last modified by TerraIndex TerraIndex on 2022/05/20 11:11 

Turbidimeter surface water 
last modified by TerraIndex TerraIndex
on 2022/05/20 11:11

Table of Contents

This measuring device is used to define the clarity/turbidence of the surfacte water.
Summary description of technology
This technique measures the extent of scattering or absorption of light using infrared light in surface water. This is a measure of the suspended solids content expressed in NTU or FNU. There are two types of meters. One can be used to measure directly in surface water. With the other species, this takes place in a sample bottle.
Specific information
General information 	
 	Name	Turbidimeter surface water.		
 	Unit of measure and parameter	Scattering or absorption of light in FNU or NTU.
or, suspended solids concentration in g/l or ppm		
 	Nature technique	Physical		
 	Place of application	in situ		
 	Detection Mode	Measurement on surface open water		
 	Applicable in separate layers	Minimum layer thickness:
N/A		
 	Land soil/water bottom	water bottom		
 	Step in the data collection chain	Measure		
 	Moment of availability results	Measurement results are available in the field		
 	Technology development phase	Applied routinely		
 	Method of purchasing	as service or as a device		
 	General description of the implementation method	The device is suspended in the water column and emits infrared light at a certain angle. By reflecting the light on floating components, an amount of radiation is reflected and measured again by the device (within a radius of a few centimeters). The device is used in combination with a measuring amplifier.
There are two versions of turbidimeters: a sensor connected to a multimeter or a compact PC field kit. In the first case, after calibration, the sensor can be hung directly in surface or ground water. In the second case, a sample vial is filled and analyzed in the PC field kit.		
 	Working principle	The radiation from an infrared emitter hits the medium at a certain defined angle. The particles in the medium generate a scattering of the radiation, which in turn is received by a receiver. The settings are media dependent. The difference between outgoing and re-collected radiation is compared and expressed in a unit of radiation (FNU or NTU) or (after local calibration) in g/l suspended matter.		
 	Point / line measurement / volume measurement	Point measurement		
 	Technical specifications
(including accuracy)	The measuring range is: 0.01 - 1000 FNU to 100 g/l.
The measuring range and accuracy depends on the type of sensor and conditions.		
 	Typical depth range	Maximum 50 meters in case of in-situ measurement. Sensitivity independent of depth		
 	Time properties	The measurements can easily be repeated regularly.		
 	Measuring rate	A measurement takes approximately 10 minutes. The measured value can be read directly on the display of the device.		
 	Presentation results	The values ​​read (whether or not after calibration)		
 	Cost	Purchase equipment (sensor and transmitter) from € 2,500 (depending on version and type).		
User information 	
 	Availabilty	large number of providers		
 	Is technology often used?	Very organized		
 	Research phase in which technology can be applied	•	Realization
•	Check
•	Monitoring		
 	Verification measurements / calibration measurements	are often used		
 	Frequently used application in practice	During dredging work it is important that turbidity does not exceed certain predefined values. This can be easily determined with the turbidimeter.		
 	Suitability	The turbidimeter is extremely suitable for measuring the transparency in surface water.
If use is made of the embodiment with which measurements are taken in a sample bottle, the transparency of groundwater or waste water can also be measured, for example.		
 	Practical experiences in the Netherlands	Extensive experience in practice in the Netherlands has shown that the results are good and the measurements can be carried out smoothly and the measurement data is quickly available.		
 	“Dos“	The turbidimeter can be used for long measuring distances because a wiper keeps the optical parts clean (fog is prevented/removed). The 4-beam measuring principle checks the sensor itself.		
 	“Don'ts“	Air bubbles can affect the result. Therefore, for example, do not apply near dredging activities.		
 	Also suitable for	Water temperature measurements.		
References
•	Endress
•	RIKZ
Turbidimeter surface water

Image	Turbidimeter surface water	
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•	Summary description of technology
•	Specific information
•	References
•	Turbidimeter surface water