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4.9
Turbidity Sensor
Turbidity is the indirect measurement of the suspended solid concentration in water and is typically determined by shining a light
beam into the sample solution and then measuring the light that is scattered off of the suspended particles. Turbidity is an important
water quality parameter and is a fundamental tool for monitoring environmental changes due to events like weather-induced runoff
or illicit discharges. The source of the suspended solids varies (examples include silt, clay, sand, algae, and organic matter) but all
particles will impact light transmittance and result in a turbidity signal.
NOTE:
The ProDSS Turbidity Sensor must be used with the Extended Sensor Guard [Item# 626740] which is sold separately.
Specifications
Default Units
FNU
Temperature
-5 to + 50°C
Operating
-20 to + 80°C
Storage
Range
0 to 4000 FNU
0-999 FNU: 0.3 FNU or ±2% of reading,
whichever is greater; 1000-4000 FNU:
Accuracy
±5% of reading
Response
T63<2 sec
0-999 FNU: 0.01 FNU
Resolution
1000-4000 FNU: 0.1 FNU
Sensor Type
Optical, 90° scatter
Optics:
.
860±15 nm
Excitation
ASTM D7315-07a "Test Method for Determination
1
of Turbidity Above 1 Turbidity Unit (TU) in Static Mode."
Performance based on 3-point calibration done
2
with YSI AMCO-AEPA standards of 0, 124, and 1010
FNU. The same type of standard must be used for all
calibration points.
Sensors, Calibration, and Maintenance
2
67
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