PART THREE - OPERATION
SECTION 5 - ANALYZER CALIBRATION
Model P53 pH/ORP Analyzer (universal-mount 1/2 DIN)
Rev. 6-501
58
☞
5.2 pH Calibration
☞
2 POINT BUFFER Method
☞
Calibration Tip!
If a “CONFIRM FAILURE?” screen ap-
pears during calibration, press
ENTER key
to confirm.
Then, use
×
×
or
Ø
Ø
key
to select between “CAL: EXIT?”
or “CAL: REPEAT?” and do one of the following:
•
With the “(CAL: EXIT)” screen selected, press
ENTER
key
. After the “CONFIRM ACTIVE?” screen appears,
press
ENTER key
to return the analog outputs and re-
lays to their active states (MEASURE screen appears).
•
With the “(CAL: REPEAT)” screen selected, press
ENTER key
to repeat calibration of the point.
Based on convenience and your application requirements,
use one of the four methods provided for pH calibration.
CAUTION:
WHEN USING A NEW SENSOR OR REPLACING THE
SALT BRIDGE AND STANDARD CELL SOLUTION
ON AN EXISTING SENSOR, ALWAYS PERFORM A
“RESET CAL” USING THE TEST/MAINT MENU (PART
THREE, SECTION 6.10) BEFORE CALIBRATING.
NOTE:
When calibrating a sensor for the first t ime, always
use a two-point method for best accuracy.
This recommended method requires two buffers, typically
pH 7 and pH 4. (pH 10 buffer is also readily available but is
not as stable, particularly at extreme temperatures.) This
method automatically recognizes buffers from the selected
buffer set.
Therefore, you must use buffers that match
values in the buffer set
(see PART THREE, Section 4.2,
subheading “SELECT BUFFER Set for pH CALIBRATION”
for details.)
NOTE:
When using buffers that are not included in either of
the analyzer buffer sets, disregard this calibration
method. Instead, use only the “2 POINT SAMPLE”
calibration method.
