Xylem WQ pH SENSORS User Manual download pdf (Page 22)

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Dissolved Oxygen Calibration check

Step 1) Fill one container with tap water and another with Zero Oxygen

solution.

Step 2) Place the dissolved oxygen sensor into the container with the

Zero Oxygen solution. Turn on the power supply and the

current meter. Let the sensor stabilize for 5 minutes before

taking any measurements.

Step 3) Record the output current of the sensor, W = _______.

Remove the sensor and rinse it off in the tap water.

Step 4) Fill the one-gallon container half full of tap water and shake

vigorously for several minutes to mix the water with oxygen

Step 5) Place the dissolved oxygen sensor into the container. Turn on

the power supply and the current meter. Let the sensor

stabilize for 5 minutes before taking any measurements.

Step 6) Record the output current of the sensor, X = _____.

Step 7) The low current value for the sensor is equal to W. This current

is the output current the sensor would produce if the dissolved

oxygen value were 0%.

Step 8) The high current value for the sensor is equal to X. This

current is the output current the sensor would produce if the

dissolved oxygen value were 100%.

Step 9) Use these new current values to recalibrate the system that is

monitoring the sensor output.

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Xylem WQ pH SENSORS User Manual Page 22