PART THREE - OPERATION
SECTION 4 - ANALYZER CALIBRATION
Model P33 pH/ORP Analyzer (panel-mount 1/4 DIN)
Rev. 6-1100
60
1 POINT SAMPLE
Method
This method is similar to the 2 POINT SAMPLE method ex-
cept that only one sample (or buffer) is used to calibrate
one point. When using a sample, determine its pH value by
laboratory analysis or a comparison reading. Thereafter,
enter the known sample or buffer value.
1.
Immerse the sensor in the sample (or buffer).
Impor-
tant: Allow the sensor and sample temperatures 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
.
4.
Press
ENTER key
again to display
.
5.
Press
Ø
Ø
key
until
screen appears.
6.
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 screen displayed, press
ENTER key
to enter this selection.
7.
With the sensor in the sample (or buffer) and the
screen displayed, press
ENTER
key
to confirm. This active
screen
appears showing the measurement reading.
8.
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.
