Xylem WQ pH SENSORS User Manual
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.