Campbell Scientific CS526 ISFET pH Probe - Manual (Page 25)

Appendix C. Calibration
This calibration process uses 7-pH and 4-pH buffer solutions.
Protect the sensing chip from UV radiation during calibration. If
calibrating in sun or fluorescent light, shield the sensing chip from
UV radiation by using dark containers for the buffer solutions.
Load the example CRBasic program into the datalogger (Appendix C.1,
Example Calibration Program). Wire the CS526 to the datalogger according
to the following diagram.
Wire Color Datalogger Connection
Red (Caution! 5 Vdc Max!) 5V
Black
G
White Control Port (Tx)
Green Control Port (Rx)
Clear G
Use the Numeric Display found in the datalogger software PC200W, PC400,
LoggerNet, PConnect, or PConnectCE to monitor the measurement in real
time.
1. Place the CS526 into a pH-7 buffer solution (pn 25586).
2. Monitor the [pHmV] reading in the Numeric Display and allow it to
stabilize.
3. Change the value in [pH7record] to -1.
4. Remove the CS526 from the pH-7 buffer solution and rinse with deionized
water.
5. Blot the CS526 dry with a soft cloth or paper towel.
6. Place the CS526 in a pH-4 buffer solution (pn 25587).
7. Allow the [pHmV] reading to stabilize.
8. Change the value in [pH4record] to –1.
9. Change the value in [pHcal] to –1.
10. The CS526 is now ready to be placed in the solution to be measured.
NOTE
C-1