Xylem WQ pH SENSORS - Manual (Page 9)

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g. Calibration should be checked monthly using the following procedure.
You will need the following equipment:
3 small containers
1 bottle of 10pH buffer
1 bottle of 4pH buffer
1 power supply
1 current meter
Connecting wires as necessary
Connect the sensor to the power supply and current meter in
the following way. Attach the black wire to the ground terminal of the
power supply. Attach the white wire to the positive input of the current
meter. Connect the ground terminal of the power supply to the ground
of the current meter. Attach the red wire to the positive terminal of the
power supply. See Appendix C. Warning: Always connect the
sensor with the power turned off.
See Appendix A for the pH calibration worksheet.