PART THREE - OPERATION
SECTION 5 - ANALYZER CALIBRATION
Rev. 6-501
Model P53 pH/ORP Analyzer (universal-mount 1/2 DIN)
63
2 POINT SAMPLE Method
This method requires you to enter the known pH values of
two process samples (or two pH buffers). Determine sample
values using laboratory analysis or comparison readings.
1.
Immerse the sensor in the first solution (sample or
buffer).
Important: Allow the sensor and sample
temperatures to equalize.
Depending on their tem-
perature differences, this may take 30 minutes or more.
2.
Press
MENU key
to display
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.
3.
With the “CALIBRATE” line selected, press
ENTER key
to display
.
4.
With the “SENSOR” line selected, press
ENTER key
to
display
.
5.
Use
Ø
Ø
key
to select the “2 POINT SAMPLE” line and
press
ENTER key
to display
. Use
×
×
or
Ø
Ø
key
to view the three states that the analog outputs
(and relays) can be in during calibration:
•
HOLD OUTPUTS:
Holds their present values.
•
XFER OUTPUTS:
Transfers to preset values.
•
ACTIVE OUTPUTS:
Responds to measured values.
With the desired choice displayed, press
ENTER key
to
enter this selection.
6.
With the sensor in the first solution (sample or buffer)
and the
screen displayed, press
ENTER key
to confirm. This active
screen appears showing the measurement reading.
7.
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
