Neulog turbidity sensor guide – Carolina NeuLog Turbidity User Manual
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NEULOG TURBIDITY SENSOR GUIDE
Push button switch for Start/Stop experiments in off line mode
LED indicator of experiment status (blinks while collecting data)
Internal photodiode for collecting scattered infrared light
Pre-calibrated sensing equipment
Note: NeuLog products are intended for educational use.
Videos and experiment examples:
Videos, literature and other probes can be found at
Monitoring Yeast Growth
Technical background:
The philosophy behind NeuLog’s plug and play technology is based on each sensor’s
ability to store its own data due to an internal flash memory chip and micro-controller
in each plastic NeuLog body. This technology allows the sensor to collect and then
store the digital data in the correct scientific units (
o
C,
o
F, Lux, %, ppm, for example).
The sensor is pre-calibrated at the factory and never will require future calibration.
The built-in software in the logger can be upgraded for free at any time using the
provided firmware updates on the NeuLog website.
Samples are poured into cuvettes which are then placed inside the Turbidity Sensor
for analysis. Infrared light is directed at the cuvette and is scattered off of any
suspended particles present in the sample. The amount of light being scattered, and
then detected, is directly proportional to how many solid particles are present in the
sample. A photodiode positioned perpendicular to the light source loses free electrons
(photoelectrons) when the scattered photons hit it, creating a readable voltage.
Turbidity is calculated in Nephelometric Turbidity Units (NTU) based on the voltage
reading.
Beer’s Law:
Beer’s Law is an extremely useful concept in solution concentration testing in the
fields of Chemistry and Biology. Standard curves are created by using solutions of
known concentrations which analyzed in a turbidity to determine the absorbance then
graphed. The absorption for unknown samples can easily be tested and plotted on
the standard curve to determine their concentration.
Maintenance and storage:
Never place anything into the turbidity sensor opening other than the cuvettes.
Never submerge the NeuLog plastic body in any liquid.
Do not allow liquid into the NeuLog plastic body.
After using the probe wipe off all excess material liquid or residue from the
turbidity sensor.
Store in a box at room temperature out of direct sunlight.
Cuvette usage guide can be found in the beginning of this document
Warranty:
We promise to deliver our sensor free of defects in materials and workmanship for a
period of 3 years from the date of purchase. Our warranty does not cover damage of
the product caused by improper use, abuse, or incorrect storage. Sensors with a shelf
life such as ion selective proves have a warranty of 1 year. Should you need to act
upon the warranty please contact your distributor. Your sensor will be repaired or
replaced.