Xylem WQ pH SENSORS User Manual download pdf (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.

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Xylem WQ pH SENSORS User Manual Page 9