PART THREE - OPERATION
SECTION 5 - ANALYZER CALIBRATION
Model P53 pH/ORP Analyzer (universal-mount 1/2 DIN)
Rev. 6-501
60
calibration of the point by pressing the
ENTER
key
. However, this is not recommended be-
cause the pH and temperature signals may not
be fully stabilized, resulting in a less accurate
calibration.
7.
After the
screen appears, remove the
sensor from the first buffer, rinse it with clean water,
and immerse it in the second buffer (typically 4 pH).
8.
Press
ENTER key
to confirm this.
While the
screen is displayed, the
analyzer waits for the pH and temperature signals to
stabilize, measures the buffer value, and automatically
calibrates this point.
Thereafter, a screen like
appears for 5
seconds to confirm calibration of this point.
9.
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
Differential sensor and the slope remains low, replace
the salt bridge and standard cell solution (see sensor
instruction manual for details). If using a conventional
combination electrode, consider replacing it.
10. Press
ENTER key
to end calibration (“2 POINT
BUFFER: CONFIRM CAL OK?” screen appears).
11. Re-install the sensor into the process.
12. Press
ENTER key
to display the active measurement
reading on the “2 POINT BUFFER: CONFIRM ACTIVE?”
output status screen. When the reading corresponds to
the actual typical process value, press
ENTER key
again to return the analog outputs and relays to their
active states (MEASURE screen appears).
This completes “2 POINT BUFFER” calibration.
