PART THREE - OPERATION
SECTION 4 - ANALYZER CALIBRATION
Rev. 6-1100
Model P33 pH/ORP Analyzer (panel-mount 1/4 DIN)
53
☞
4.2 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 analog outputs and relays
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.
NOTE:
When calibrating a sensor for the first time, always
use a two-point method.
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 buffer set
you selected. Therefore, you must use buffers that match
values in the buffer set. (See PART THREE, Section 3.2,
subheading “SELECT BUFFER Set” for selection details.)
NOTE:
When you want to use buffers not included in either
of the analyzer buffer sets, disregard this calibration
method. Instead, calibrate using only the “2 POINT
SAMPLE” method.
1.
Immerse the sensor in the first pH buffer (preferably
pH 7).
Important: Allow the sensor and buffer tem-
peratures to equalize.
Depending on their temperature
differences, this may take 30 minutes or more.
2.
Press
MENU key
to display a “MAIN MENU” screen.
If the
screen is not showing, use
Ø
Ø
or
×
×
key
to display it.
3.
Press
ENTER key
to display
.
