PART THREE - OPERATION
SECTION 5 - ANALYZER CALIBRATION
Model P53 pH/ORP Analyzer (universal-mount 1/2 DIN)
Rev. 6-501
64
screen appears showing the “last”
measured value.
8.
Determine the pH value of the first solution. For a sam-
ple, use laboratory analysis or a calibrated portable pH
meter. (When using a pH buffer, refer to the table on
the buffer bottle to find the exact pH value correspond-
ing to the temperature of the buffer.)
9.
With the static
screen displayed, use
arrow keys
to adjust the displayed value to exactly
match the known pH value of the first solution (sample
or buffer). Then press
ENTER key
to enter the value
and complete calibration of the first point.
10. After the
screen appears, remove the
sensor from the first solution, and rinse it with clean
water.
11. Immerse the sensor in the second solution, and press
ENTER key
to confirm. This active
screen appears showing the measurement reading.
12. Wait for the reading to stabilize which may take up to
30 minutes. Then press
ENTER key
. The “PLEASE
WAIT” screen may appear if the reading is still too un-
stable. After the reading has stabilized, this static
screen appears showing the “last”
measured value.
13. Determine the pH value of the second solution.
14. With the static
screen displayed, use
arrow keys
to adjust the displayed value to exactly
match the known pH value of the second solution. Then
press
ENTER key
to enter the value, completing cali-
bration of the second point.
15. A “pH SLOPE XX.X mV/pH” screen appears, indicating
a slope value to measure sensor performance. The
slope should be between 54 and 62 mV/pH for optimal
sensor performance. Typically, as the sensor ages
and/or becomes dirty, its slope decreases. When the
slope is less than 54 mV/pH, clean the sensor to im-
prove its performance. If you are using a GLI
