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Instruction Manual
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012-13883A
Advanced Chemistry Sensor
PS-2172
Included Equipment Part Number
1. Advanced Chemistry Sensor PS-2172
2. Stainless Steel Temperature Probe PS-2153
3. Conductivity Probe (10x) PS-2571
4. pH Electrode PS-2573
5. Polyurethane Tubing (60 cm long, inch ID)
6. Quick-release Connectors (qty. 4)
7. Tubing Connectors (qty. 4)
8. Syringe (60 cc)
Required Equipment
PASPORT Interface See PASCO catalog or www.pasco.com
Optional Equipment
Fast-response Temperature Probe PS-2135 (3-pack)
Skin/surface Temperature Probe PS-2131
Various Ion-selective Electrodes (ISE) See PASCO catalog or www.pasco.com
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Oxidation Reduction Potential (ORP) Electrode CI-6716
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Advanced Chemistry Sensor Introduction
Conductivity
Temperature
PAS PORT
Interface
Pressure
Introduction
The PS-2172 Advanced Chemistry Sensor combines four sensors in a single unit:
• Temperature
• pH, ORP and ion-selective electrode voltage
• Absolute gas pressure
• Conductivity
When connected to a PASPORT interface, the Advanced Chemistry Sensor collects
data at up to 100 samples per second from each component sensor. You can use just
one component sensor at a time or any combination simultaneously. If you have a
PASPORT interface that supports multiple sensors, or if you have more than one
interface connected to your computer, you can use the Advanced Chemistry Sensor in
combination with other PASPORT sensors.
Sensor, Interface, and Software Setup
Connect the multi-sensor to your PASPORT interface as pictured (right).
Connect any or all of the included probes to the multi-sensor. (You can
leave any of the probes disconnected if you do not plan to use it.) If you will
be using an ion-selective electrode or oxygen reduction potential electrode,
connect it to the pH/ISE/ORP port. If you plan to measure pressure in an
apparatus or the included syringe, connect it to the sensor’s pressure port
using the included tubing and a quick-release connector.
Follow the instructions below to set up the sensor with Capstone,
SPARKvue/SPARK SLS, or the Xplorer GLX (standalone).
For detailed information about each of the multi-sensor sensor’s component
sensors see pages 3–5.
Capstone Setup
Connect the PASPORT interface using a Capstone supported interface.
Build one or more displays for data. Press to start data collection and
to stop data collection.
Note that the sensor will collect data for probes that are not connected. These data are
listed in the Data Summary and are displayed if selected on one or more displays. The
default sampling rate and other parameters are defined with Hardware Setup in the
Tool Palette. Calibration is performed with the Calibration wizard in the Tool Palette.
For more instructions on using Capstone, refer to the Capstone Online Help or User’s
Guide.
PS-2172
SPARKvue/SPARK SLS Setup
Connect the PASPORT interface directly to a SPARK SLS or to a computer using a
SPARKvue supported interface. Build one or more displays for data. Press to
start data collection and to stop data collection.
The default sampling rate is defined with Sampling Options. Calibration is performed
with Experiment Tools > Calibrate Sensor. For more instructions on using the
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Model No. PS-2172 Temperature
F4
SPARKvue/SPARK SLS, refer to the SPARKvue/SPARK SLS Online Help or User’s
Guide.
Xplorer GLX Setup
If you are using an Xplorer GLX in standalone mode, press to start data collection.
Note that the sensor may collect data for probes that are not connected. Hide or ignore
these measurements. To hide measurements that you do not need, open the Sensors
screen (from the Home screen, press ). In the Sensors screen you can also
change the sampling rate and open the calibration dialog box. For more instructions
on using the Xplorer GLX, refer to the GLX User’s Guide.
Temperature
Use this component of the multi-sensor to measure the temperature of a fluid or
object. The measurement can be displayed in units of °C, °F, or K. (In DataStudio,
click the Setup button to change units.) You can use the included stainless steel probe
or a different probe, such as the Fast-response Probe (PS-2135) or Skin/Surface Probe
(PS-2131). PASCO apparatus containing an embedded 10 k thermistor can also be
connected to the multi-sensor. The multi-sensor automatically detects the presence of
a temperature probe, and it will only collect temperature data if a probe is connected.
Measuring Temperature
To measure temperature, connect the probe and start data collection. Immerse the tip
of the probe in a fluid or place it in contact with an object. The included stainless steel
probe can be used in both dry conditions and in liquids, such as water and other mild
chemicals and solutions.
Tip: For better chemical resistance, use a Teflon® cover (CI-6549).
Temperature Calibration
The temperature measurement can be calibrated; however, for most applications calibration is not necessary. Use a two-point calibration with two standards of known
temperature. Refer to the SPARKvue/SPARK SLS, Capstone, or Xplorer GLX User’s
Guide for calibration instructions.
pH/ISE/ORP
The pH/ISE/ORP input of the multi-sensor is a specialized voltage sensor. Its BNC
connector accepts the included pH electrode, as well as ISE and ORP electrodes. The
sensor measures the voltage produced by any of these electrodes. When used with a
pH probe, the sensor also computes the pH based on the measured voltage.
Connect the pH electrode (or other electrode) to the pH/ISE/ORP port and start data
collection. On your computer or interface, display pH measurement for the calculated
pH (assuming that the pH electrode is connected). For other electrodes, display ISE
Voltage (this is valid for ISE, ORP, and pH.)
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Advanced Chemistry Sensor pH/ISE/ORP
Measuring pH
The pH electrode produces a voltage proportional to the pH of the solution that it is
immersed in. This voltage is measured by the multi-sensor, which computes pH.
Unscrew and remove the storage bottle from the electrode (be careful not to spill the
storage solution). Push the O-ring and bottle cap up the electrode handle (or remove if
using the Drop Counter). Rinse the electrode tip with distilled water. If you see bubbles in the electrode bulb, gently shake the electrode downward (similar to shaking
down a thermometer). Start data collection. Place the tip of the electrode in the solution to be measured and wait for the reading on your computer or interface to stabilize. Rinse the electrode with distilled water before measuring another solution.
pH Calibration
The pH measurement can be calibrated; however, for most applications calibration is
not necessary. Perform a two-point calibration with two buffer solutions of known
pH. Refer to the SPARKvue/SPARK SLS, Capstone, or Xplorer GLX User’s Guide
for calibration instructions.
pH Electrode Maintenance and Storage
Cleaning
If the pH electrode becomes contaminated, use one of these methods to clean and
restore it. After any of these procedures, soak the electrode in a pH 7 buffer solution
for 30 minutes.
• General Contamination: Soak the electrode in 0.1 molar hydrochloric acid
(HCl) for 15 minutes.
• Protein Deposits: Soak the electrode in a solution of 1% pepsin in 0.1 molar
HCl.
• Inorganic Deposits: Rinse the electrode with 0.1 molar ethylene diamine
tetra-acetic acid (EDTA) tetrasodium solution.
• Oil and Grease Film: Wash the electrode carefully in a mild detergent or a solvent known to be effective for the particular film.
• Unknown Contamination: Soak the electrode alternately in 12 molar sodium
hydroxide (NaOH) and 1 molar HCl. Leave it in each solution for one minute.
Rinse completely between soakings. End with HCl. (The NaOH etches the glass
and the HCl reestablishes hydrogen ions on the surface.)
If these steps fail to improve the response of the electrode, replace it.
Storage
Store the pH electrode in the included electrode storage bottle with one of the following solutions. (Never store the electrode in distilled water.)
• Short-term (up to one week): pH 4 buffer solution or tap water.
• Long-term (over one week): 4 molar KCl solution (included with the electrode).
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Model No. PS-2172 Pressure
platinized
platinum
conductors
glass rod
Conductivity Electrode
Light indicates
selected range
1000
10000
100000
Range (mS/cm) 10x probe
Pressure
This component of the multi-sensor measures absolute gas pressure from
20 kPa to 400 kPa. The measurement can be displayed in units of kPa, N/m
pounds per square inch (p.s.i.), atmospheres (atm), or torr.
With nothing connected to pressure port, the sensor measures atmospheric
pressure.
To measure the pressure in an apparatus or the included syringe, connect it to
the sensor using the included tubing and connectors. Insert the barbed end of a
quick-release connector into a piece of tubing. Push the quick-release connector onto the sensor’s pressure port and twist it clockwise to secure it. If your apparatus
has a barbed or tapered connector (such as the included syringe), plug it directly into
the other end of the tubing. If the apparatus has a quick-release pressure port, use
another quick-release connector on the other end of the tubing. Use one of the
included tubing connectors to connect the tubing to larger-diameter tubing or to a rubber stopper with a hole.
Note: Do not allow liquid to enter the pressure port.
Conductivity
The conductivity component sensor measures the electrolytic conductivity of aqueous
solutions. It determines the conductivity by applying an alternating voltage to the
electrode cell at the end of the probe and measuring the resulting current. You can use
the included 10x electrode or a 1x electrode (PASCO part 699-06620). In the software
or on the interface select the Conductivity (10x) or Conductivity (1x) measurement,
depending on which electrode you are using.
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Measuring Conductivity
Note: The 10x probe can be used to measure conductivity up to 100000 S/cm. The 1x probe
has one tenth of the range (up to 10000
S/cm) but ten times better resolution.
Before using the conductivity electrode, soak the end in distilled water for 5 to 10
minutes. Connect the electrode to the multi-sensor and start data collection. Immerse
the end of the electrode in the solution to be measured and wait for the reading to stabilize. Rinse the electrode with deionized water before measuring a different solution.
The conductivity sensor has three ranges, which you select using the three buttons on
the multi-sensor. To select a range, push one of the buttons: for 0
S/cm, for or 0 S/cm to 10000 S/cm, or for 0 S/cm to 100000 S/cm.
S/cm to 1000
Lights on the buttons indicate which range is selected. To determine which range is
appropriate, look at the data (on a Graph display, for instance) while it is being collected; if the measurement appears to be “railed” at the top of the selected range
(1000
S/cm or 10000 S/cm), select the next higher range. You can push a button to
change the range without stopping data collection.
Note: The ranges specified above are for a 10x probe. Divide each range by 10 if you are using a
1x probe.
The conductivity electrode is sensitive to very low concentrations of dissolved solids,
so you will probably never measure a sample with a conductivity of zero. A reading
of 25 S/cm for “pure” water is typical. True pure water is difficult to obtain and
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Advanced Chemistry Sensor Conductivity
Solution Conductivity
(S/cm)
Ultrapure
Water
0.05 to 0.75
Drinking
Water
50 to 1500
Ocean
Water
~53000
TDS (ppm)
Conductivity S/cm
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=
store. The table (right) lists typical conductivity values for common aqueous solutions
at 25 °C.
As a rule of thumb, to estimate total dissolved solids (TDS) in parts per million
(ppm), divide the conductivity in S/cm by 2:
Conductivity Calibration
The conductivity measurement can be calibrated; however, for most applications calibration is not necessary. Use a one-point calibration with a standard solution of
known conductivity. For instructions on preparing a standard solution, see the Appendix section. Refer to the SPARKvue/SPARK SLS, Capstone, or Xplorer GLX User’s
Guide for calibration instructions.
Conductivity Electrode Maintenance And Storage
To ensure accurate and reproducible results, the electrode must be clean. Substances
on the electrode may contaminate the solution being tested and change the conductivity. To clean the electrode, dip the end into a detergent solution or dilute nitric acid
(1%) and stir for three minutes, then rinse with deionized water.
For storage, dry the electrode and return it to its box. Before use, soak the electrode in
distilled water for at least 5 minutes.
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Model No. PS-2172 Specifications
Specifications
General
Component Sensors Temperature, pH/ISE/ORP probe voltage, Absolute Pressure, Voltage
Max. Sampling Rate 100 samples per second (for each component sensor)
Default Sampling Rate 10 samples per second
Temperature
Range 35 °C to 135 °C
Accuracy 0.5 °C
Resolution 0.01 °C or better
Sensing Element 10 k thermistor located in probe tip
pH/ISE/ORP probe voltage
Electrode Connector standard BNC
Vol tage R a n ge 2000 mV to 2000 mV
Voltage Resolution 0.1 mV
pH Range 0 to 14
pH Resolution 0.001
Absolute Pressure
Range 20 kPa to 400 kPa
Accuracy 2 kPa
Resolution 0.1 kPa
Repeatability 1 kPa
Conductivity
Range three user-selectable ranges:
0 to 1000 S/cm, 0 to 10000 S/cm, 0 to 100000 S/cm with included 10x probe
0 to 100 S/cm, 0 to 1000 S/cm, 0 to 10000 S/cm with optional 1x probe
Accuracy ±10% of full scale without calibration
Resolution better than 0.05% of full scale
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Advanced Chemistry Sensor Specifications
Appendix A: DataStudio Calibration
In DataStudio, click the Setup button to open the Experiment Setup window; in that
window, click the Calibrate button to open the Calibrate Sensors dialog box. For a
two-point calibration, you will need two “known standards,” such as two buffer solutions of known pH or two liquids of known temperature.
1. From the Sensor field, select Chemistry.
2. From the Measurement field, select Temperature or pH.
3. Ensure that “Calibrate all similar measurements simultane-
ously” is not selected.
4. From the Calibration Type menu, select 2 Point (Adjust Slope
and Offset), if it is not already selected.
5. Place the temperature or pH probe in the first known standard.
6. Enter the known temperature or pH of the standard in the
Standard Value field for Point 1.
7. Observe the Present Sensor Measurement and wait until it
has stabilized.
8. Click the Read From Sensor button for Point 1.
9. Place the probe in the second known standard.
10. Enter the known temperature or pH of the standard in the
Standard Value field for Point 2.
11. Observe the Present Sensor Measurement and wait until it
has stabilized.
12. Click the Read From Sensor button for Point 2.
13. Click OK to accept the new calibration.
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Model No. PS-2172 Specifications
Appendix B: Reference Solutions for
Conductivity Calibration
Reference
Solution
A 1 74.2480 g of KCI weighed in air per 1 L of
B 0.1 7.4365 g of KCI weighed in air per 1 L of
C 0.01 0.7440 g of KCI weighed in air per 1 L of
D 0.001 Dilute 100 mL of solution C to 1 L at 20 °C 0 77.69
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Excluding the conductivity of the water used to prepare the solutions. These tabulated conductivity values are in international
units. When using measuring instruments calibrated in absolute units, multiply the tabular values by 0.999505
Approximation
Normality of
Solution
solution at 20 °C
solution at 20 °C
solution at 20 °C
Method of Preparation Temperature
(°C)
0 65176
18 97838
25 111 342
0 7138
18 11167
25 12856
0 773.6
18 1 220.5
25 1 408.6
18 127.54
25 148.93
Electrical
Conductivity
(µS/cm)
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Advanced Chemistry Sensor Technical Support
Technical Support
For assistance with any PASCO product, contact PASCO at:
Address: PASCO scientific
10101 Foothills Blvd.
Roseville, CA 95747-7100
Phone: 916-786-3800 (worldwide)
800-772-8700 (U.S.)
Web: www.pasco.com
Email: support@pasco.com
Limited Warranty
For a description of the product warranty, see the PASCO catalog.
Copyright
The PASCO scientific 012-13883A Advanced Chemistry Sensor Instruction Manual 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 scientific, Capstone, SPARKvue/SPARK SLS, MultiMeasure Sensors, PASPORT, Xplorer and Xplorer GLX are
trademarks or registered trademarks of PASCO scientific, in the United States and/or in other countries. All other brands, products, or
service names are or may be trademarks or service marks of, and are used to identify, products or services of, their respective owners. For more information visit www.pasco.com/legal. Teflon is a registered trademark of DuPont.
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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