Membrane Sensor Calibration; Ph Calibration - Evoqua Wallace & Tiernan Depolox 3 plus Manual

Depolox
3.2.2 Membrane Sensor Calibration (All Membrane Types)
3.2.3

pH Calibration

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WT.050.560.001.UA.IM.0714
3 plus ReSIDUAl ANAlYZeR
®
e. Return to the basic display by pressing the eSC key twice.
a. Take a sample at the measuring cell. Determine the residual value of this
sample.
b. Starting from the basic display, press the F key until the "Calibration" menu
is displayed.
c. Press the  key until the menu "DIS span" is reached. Press the  key to
open the menu.
d. Press keys  or  until the displayed value agrees with the manually
measured value.
e. Store the value using the  key. The disinfectant measuring cell is now
calibrated. In case of an error message refer to paragraph 4.1.1, Errors.
Return to the basic display by pressing the eSC key twice.
f.
NOTE: pH measurement is optional.
WARNING: DO NOT CONTINUE TO USE BUFFER SOLUTIONS AFTER USE-By
DATE. BUFFER SOLUTIONS THAT HAVE BEEN OPENED CAN ONLy BE KEPT
FOR A LIMITED PERIOD. READ THE LABEL ON THE BOTTLE.
NOTE: Sample water and buffer solution should have the same temperature.
In case sample water temperature deviates from the reference temperature
of 77° F (25° C), calibrate the resp. value shown in the temperature table (see
label on buffer solution).
There are two methods for pH calibration. The first adjusts the zero and the
span settings for the pH range. The second calibration is an "offset," in which
the pH sensor is exposed to a known pH solution and the displayed value is
adjusted, up or down, to match the known value. This calibration can also be
performed on the process water with the sensor in the flow cell. Verify that
the pH of the process water has been accurately determined.
NOTE: The offset calibration is typically all that is recommended to calibrate
pH when first starting the unit or replacing the sensor. The Depolox® 3 plus
zero and span values are factory set in order to properly work with the sen-
sor. Complete the zero and span calibrations, if there is a problem, only after
completing the offset calibration.
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