PASCO PS-2122 User Manual
Tu rb id it y S en so r
PASPORT Extension
Cable
NTU 100 Standard
(6 mL bottle)
6 mL Cuvette
and Cap
(5 each)
PS-2122 Turbidity
Sensor
Calibration
Button
Sample
Compartment Lid
PS-2122
Instruction Sheet
012-08162D
Included Items Included Items
Turbidity Sensor (PS-2122) PASPORT Extension Cable (PS-2500)
NTU 100 Standard (PS-2511) Cuvette, 6 mL, with Cap (5 each)
Cuvette Cap Labels (not shown) Storage Box (not shown)
Required Items* Required Items*
PASCO Interface PASCO Data Acquisition Software
*See the PASCO catalog or the PASCO web site at
www.pasco.com for more information.
Product Description
The PS-2122 Turbidity Sensor is designed to measure the
turbidity level (“cloudiness”) of water samples in nephelo-
metric turbidity units (NTU) by measuring light scattered
by the sample at 90 degrees. The light source is stabilized
to prevent drift. The opaque housing eliminates ambient
light.
The Turbidity Sensor is intended for educational purposes
and is not recommended for environmental compliance
testing or similar activities.
®
Model No.PS-2122 Product Description
Sensor
PASPORT
Input Port
Interface
The Turbidity Sensor makes relative measurements of turbid solutions with a particle size between 0 and 200
microns. Because turbidity is a time-dependent dynamics
phenomenon, factors such as particle density, particle size,
temperature, and pressure may cause reading variation,
especially in repeatability studies. For particle sizes above
200 microns, extract the large particles or allow more time
for measurement.
Suggested Activities
• Compare the turbidity of water sample from various
locations.
• Determine the rate of settling of a sample.
• Measure the formation of a precipitate.
Quick Start
• Plug the Turbidity Sensor into one of the PASPORT
input ports of a PASCO interface (such as the 850 Universal Interface or SPARK Science Learning System).
Calibration
Preparation Procedures: Regular Use
Calibration of the Turbidity Sensor is required the first
time the sensor is used. It is also necessary when you are
measuring solutions with varying temperatures, or when
using different cuvettes. All calibrations are stored inside
the sensor in flash memory.
• To prepare for calibration of the Turbidity Sensor, gently invert the 100 NTU Standard cuvette (included) five
times. Clean the outside of the cuvette.
• Put 6 mL of deionized water into an empty cuvette and
tighten the cap. Clean the outside of the cuvette.
• Connect the sensor to a P ASPORT -compatible interface.
• NOTE: If more distance is needed between the sensor
and the interface, connect the sensor to the PASPORT
Extension Cable (PS-2500) and then plug the cable into
the interface.
• Put 6 milliliters (mL) of a fluid sample in a cuvette and
cap it. NOTE: Avoid touching the glass with your fingers. Wipe the glass with a non-abrasive cleaning tissue
and/or silicone oil.
• Put the sample cuvette into the Sample Compartment
and close the lid.
• Start the PASCO data acquisition software (such as
PASCO Capstone). Set up a data display in the software.
• Put the cuvette with the deionized water into the sensor
Sample Compartment and close the lid.
Calibration
• Press and release the green Calibration Button on the
sensor.
• The light-emitting diode (LED) in the button will come
on.
• In a moment, the LED in the button will begin to blink.
After a few moments of blinking, press the green button
again to stop the blinking.
• Replace the first cuvette with the 100 NTU Standard
cuvette and close the lid
• Press and release the green button. After the LED
begins to blink, press the button again to stop the blinking.
• T o verify, start the PASCO data acquisition software, set
up a Digits display, and start recording data.
• Begin recording data.
SETUP: For more information on setting up the software
and recording data, refer to the User’s Guide and online
help for the data acquisition software.
• The Digits display should show approximately 100
NTU ±1 NTU.
• Stop recording data.
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