PASCO PS-3204, Reference Manual

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®
Wireless pH Sensor PS-3204
8
013-14662B
Appendix B: Calibration
Prepare for Calibration
Calibration will need distilled water, two different pH buffer
solutions, and containers for the water and buffer solutions.
The sensor will need to be “paired” with a tablet or
computer, and the data collection software should be
running.
• The pH Buffer Capsule Kit (SC-2321) from PASCO
includes three vials, each with ten capsules of pH 4.0,
pH 7.0, and pH 10.0, and a bottle of preservative
solution which contains a pH indicator and will color
each buffer solution for easy identification.
• Each capsule can make 100 milliliters (ml) of buffer
solution.
• Containers such as 100 ml and 1000 ml beakers are
available from PASCO.
• Make two buffer solutions with pH values that “bracket”
the pH values to be measured. For this example, make
one with pH 4 and the other with pH 7. The calibration
buffer solutions should be at the same temperature as
the solutions that will be measured.
Using SPARKvue Software for Calibration
NOTE: Check the on line Help System in SPARKvue for the
most up-to-date information.
1. Click (or press) the Experiment Tools button ( ).
• The Experiment Tools screen opens.
2. Click Calibrate Sensor .
• The Calibrate Sensor: Select Measurement screen
opens.
3. Click the Sensor box and click the sensor to be
calibrated.
4. Click the Calibration Type box and click a calibration
type. (For this example, click “ 2-point ”.)
5. Click Next .
• The Calibrate Sensor Enter Values screen opens.
6. Rinse the end of the pH Probe in distilled water and
then put the pH Probe into a pH 4 buffer solution.
7. Under Calibration Point 1 , click the Standard Value
box and enter the known value (4.00 in this example).
8. Under Calibration Point 1 , click Read From Sensor .
• The value measured by the sensor is transferred to the
Sensor Value box.
9. Take the probe out of the first buffer solution and rinse
the end of the probe with distilled water. Dry the probe
and then put the pH Probe into the pH 7 buffer solution.
10. Under Calibration Point 2 , click the Standard Value
box and enter the pH buffer’s known value (7.00 in this
example).
11. Under Calibration Point 2 , click the Read From
Sensor box.
• The second value measured by the sensor is
transferred to the
Sensor Value box.
12. Click OK.
Using PASCO Capstone for Calibration
NOTE: Check the on line Help System in PASCO Capstone
for the most up-to-date information.
1. Click Calibration ( ) in the Tools Palette.
2. Choose the probe you would like to calibrate now: pH
Measurement .
3. Click Next .
4. Choose the type of calibration you would like to
perform:
Two Standards (2 point) .
5. Click Next .
6. Enter the first known pH buffer value (4.00 in this
example) in the
Standard Value text box.
7. Rinse and dry the pH Probe
8. Place the pH Probe in the pH 4 buffer solution and stir.
9. When the Current Value stabilizes, click Set Current
Value to Standard Value .
10. Click Next .
11. Enter the second known pH buffer value (7.00 in this
example) in the
Standard Value text box.
12. Remove the probe from the first buffer solution and
rinse and dry the end of the probe
13. Place the probe in the second buffer solution and stir.
14. When the Current Value stabilizes, click Set Current
Value to Standard Value .