USFilter DEPOLOX 3 PLUS, Руководство пользователя

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IM 50.560CA UA (B/4-03) 45
DEPOLOX
®
3 PLUS RESIDUAL ANALYZER
3.2.3 pH Calibration
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 tem-
perature.
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 prop-
erly work with the sensor. Complete the zero and span calibrations,
if there is a problem, only after completing the offset calibration.
• pH OFFSET Calibration
a. With sensor in flow block, test sample pH.
b. Press the
F
key until the “CALIBRATION” menu is displayed.
Press the
▼
key until the “pH offset” menu is found.
c. Press the E key.
d. Press
▼
or
▲
keys until the offset value is the difference of the
displayed pH value compared to the manually measured value.
Store this value using the
E key. (Example: For pH7 solution, the
basic display reads 7.15pH. The offset value will be adjusted to -
0.15 because the value is to come down from 7.15pH to 7.00pH.)
e. Return to the basic display by pressing the
●
key twice.
!