Xylem WQ pH SENSORS - Manual (Page 23)

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ORP/Redox Calibration check
Step 1) Fill one container with tap water and another with the 100 mV
solution.
Step 2) Place the ORP/Redox sensor into the container with 100 mV
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 a container with the 465 mV solution.
Step 5) Place the ORP/Redox 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 = _______. Remove
the sensor and rinse it off in the tap water.
Step 7) Subtract 100 mV current output from the 465 mV current output
,
X - W = _______ = C.
Step 8) Calculate B. X – (C/365)(465)= _______ = B.
Step 9) Find the low current value for the sensor. –(C/365)(500)+B=
_____ = L
C
. This current is the output current the sensor would
produce if the temperature were –500 mV.
Step 10) Find the high current value for the sensor. (C/365)(500)+B=
_____ = H
C
. This current is the output current the sensor would
produce if the temperature were 500 mV.
Step 11) Use these new current values to recalibrate the system that is
monitoring the sensor output.