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Water What-ifs

CBL (Calculator-Based Laboratory) Instructions for pH and Temperature Probes

Directions for pH Probe

Directions for Using the CBL System and the TI-83 Calculator With the pH Probe

  1. Press "PRGM." Arrow down until "CHEMBIO" is highlighted. (Check to see if "CHEMBIO" is loaded on your calculator. If not, use TI-GraphLink to load). Press "ENTER" and "ENTER" again to go to the title screen. Press "ENTER" to go to the main menu.
  2. On the main menu screen select "1:SET UP PROBES" and enter the number of probes being used.
  3. After you enter the number of probes being used, the "SELECT PROBE" menu will appear.
  4. Select "PH" under the "SELECT PROBE" screen and press "ENTER."
  5. After selecting "PH", a calibration menu will appear.
  6. Select "USE STORED" if the buffers needed for calibration are unavailable. (Note: It is always better to calibrate the pH probes before using.) If buffers are available, (buffers of pH 4 and 10 should be used) select "PERFORM NEW CALIBRATION." Follow the directions on the screen (push the trigger button on the CBL unit and enter the known value of the pH buffer). Repeat this step for the second buffer.
  7. The "MAIN MENU" will appear. Select "2:COLLECT DATA" to set up your experiment.
  8. Monitor input by placing the probe in the sample to be tested. The pH data will be displayed, but not recorded. The values must be recorded manually in a data table or chart.
  9. Rinse the pH probe thoroughly with distilled or deionized water before testing each sample and before storage.
 

Directions for Temperature Probe

Directions for Using the CBL System and the TI-83 Calculator With the Temperature Probe

  1. Press "PRGM." Arrow down until "CHEMBIO" is highlighted. (Check to see if "CHEMBIO" is loaded on your calculator. If not, use TI-GraphLink to load). Press "ENTER" and "ENTER" again to go to the title screen. Press "ENTER" to go to the main menu.
  2. On the main menu screen select "1:SET UP PROBES" and enter the number of probes being used.
  3. After you enter the number of probes being used, the "SELECT PROBE" menu will appear.
  4. Select "1:TEMPERATURE" under the "SELECT PROBE" screen and press "ENTER."
  5. After selecting "TEMPERATURE", the screen display will ask for "ENTER CHANNEL NUMBER." Always use the lowest available channel which is channel 1.
  6. The "MAIN MENU" will appear. Select "2:COLLECT DATA" to set up your experiment.
  7. Select "1:MONITOR INPUT."
  8. Monitor input by placing the probe in the sample to be tested. The temperature data will be displayed, but not recorded. The values must be recorded manually in a data table or chart.
  9. Rinse the temperature probe thoroughly with distilled or deionized water before testing each sample and before storage.
 

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©1998 April J. Cleveland for Science Junction, NC State University. All rights reserved.
page design by Lisa Leonor Grable and April J. Cleveland
URL: http://www.ncsu.edu/sciencejunction/depot/experiments/water/cbl.html
Last Modified: 6/7/98

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