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.
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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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Model No.PS-2122 Product Description
Sample Compartment
Lid
Cap Label with Arrow
Screw
Preparation Procedures: Intermittent Use
If the 100 NTU Standard cuvette has been stored for more than one month, do the following before calibration:
1.Shake the cuvette vigorously for one minute to stir up
the particles.
2.Allow the cuvette to stand undisturbed for five minutes
to eliminate air bubbles.
3.Gently invert the cuvette five times.
4.Clean the outside of the glass cuvette.
Expiration
By following the preparation procedures, the 100 NTU Standard sample should provide accurate results (±7%) up to the expiration data on the bottom of the cuvette. After the expiration date, PASCO cannot guarantee the stability of the sample. Order PS-2511 to replace the 100 NTU Standard sample.
4.With your covered hand, rotate the cuvette while observing the reading in the display. At the lowest tur­bidity reading, stop recording data. Do not rotate the cuvette any further. St op recording data.
5.With the cuvette still in the Sample Compartment, place one of the provided arrow labels on the cap, with the arrow pointing toward the screw on the front of the Sample Compartment.
For subsequent measurements, always align the arrow with the screw. Do not switch caps between cuvettes.

Sensor Usage Tips

• For very turbid samples, the initial turbidity measure­ment will fluctuate as particles begin to settle. Wait for the reading to stabilize and then record the measure­ment.
• Avoid taking readings around bright lights. Make sure that the lid is closed securely.
• Avoid or dilute dark-colored samples.
• Always fill the cuvette to the lid with at least 6 mL of sample.
• Before making a turbidity reading, use a sieve or pipette to remove “floaters” or large, visible particles of sedi­ment from the sample

Orienting the Cuvette (Optional)

To minimize variations in th e readings due to natu ral dif­ferences or imperfections in the glass of the cuvette, do the following for each cuvette you plan to use:

Specifications

Item Information Range: 0 to 400 NTU* Accuracy: ± 0.2 NTU for 0 to 20 NTU
± 0.5 NTU for 20 to 100 NTU
±1 NTU for 100 to 400 NTU Resolution: 0.1 NTU Temperature Range: 5 to 40 °C
*1 NTU = one nephelometric turbidity unit

Other Items

Cuvettes and Caps PS-2509 (set of 6 each) Silicone Oil* PS-2510
*Use the Silicon Oil to wipe the outside of the glass cuvette.
1.Insert the cuvette containing 6 mL of a sample into the
Sample Compartment, but do not close the lid. Instead, grasp the cap of the cuvette.
2.Put a piece of black cloth over your hand and the sensor
so that no light enters the sensor.
3.Set up a Digits display in the data acquisition software.
Start recording data.
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Turbidity Sensor Product Description

Technical Support

For assistance with any PASCO product, contact PASCO at:
Address:PASCO scientific
10101 Foothills Blvd. Roseville, CA 95747-7100
Phone: +1 916-786-3800 (worldwide)
800-772-8700 (U.S.) Web: www.pasco.com Email support@pasco.com
For the latest information about the Turbidity Sensor, visit the PASCO web site at www.pasco.com and enter “PS-2122” in the Search window.
Limited Warranty For a description of the product warranty, see the PASCO catalog. Copyright The PASCO scientific Instruction Sheet is copyrighted with all rights reserved. Permission is granted to non-profit educational institutions for reproduction of any part of this manual, providing the reproductions are used only in their laborato­ries and classrooms, and are not sold for profit. Reproduction under any other circumstances, without the written consent of PASCO sci­entific, is prohibited. Trademarks PASCO, PASCO Capstone, PASPORT, SPARK Science Learning System, SPARK SLS, and SPARKvue are trademarks or registered trademarks of PASCO sci­entific, in the United States and/or in other countries. For more infor­mation visit www.pasco.com/legal.
Product End of Life Disposal Instructions:
This electronic product is subject to disposal and recycling regulations that vary by country and region. It is your responsibility to recycle your electronic equipment per your local environmental laws and regulations to ensure that it will be recycled in a manner that protects human health and the environment. To find out where you can drop off your waste equipment for recycling, please contact your local waste recycle/disposal service, or the place where you pur­chased the product.
The European Union WEEE (Waste Elec­tronic and Electrical Equipment) symbol (to the right) and on the product or its packaging indicates that this product must not be dis­posed of in a standard waste container.
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