55
pH Calibration 3-Point
1.
Always start the calibration with pH 7 buffer. Fill the graduated cylinder to
the appropriate level with pH 7 buffer solution.
2.
With the probe guard installed, carefully immerse the probe into the
buffer solution. Make sure both the pH sensor and temperature sensor are
submerged.
3.
Push the
Cal
key; then select
pH
or
pH/ORP
.
4.
The
Calibration value
will automatically be adjusted based on the
selected buffer and temperature. Alternatively, the Calibration value can
be manually entered..
5.
Wait for the pH mV and temperature readings to stabilize; the white line
on the graph should be flat for about 40 seconds.
6.
Select
Accept Calibration
and press the
ENTER
key. “Ready for cal point 2”
will be displayed in the message area.
7.
Rinse the probe and calibration cup. Fill to the appropriate level with
either pH 10 or pH 4 buffer solution; it doesn’t matter which one comes
next.
8.
Immerse the probe into the buffer solution. The
Calibration value
will
automatically be adjusted based on the selected buffer and temperature.
9.
Wait for the pH mV and temperature readings to stabilize; the white line
on the graph should be flat for about 40 seconds.
10.
Select
Accept Calibration
and press the
ENTER
key. “Ready for cal point 3”
will be displayed in the message area.
NOTE:
For 2-Point calibrations, select Accept Calibration before selecting
Finish Calibration.
11.
Rinse the probe and calibration cup. Fill to the appropriate level with the
final buffer solution.
12.
Immerse the probe into the buffer solution. The
Calibration value
will
automatically be adjusted based on the selected buffer and temperature.
13.
Wait for the pH mV and temperature readings to stabilize; the white line
on the graph should be flat for about 40 seconds.
14.
Select
Accept Calibration
and press the
ENTER
key. The procedure will
automatically finish after calibrating the third point.
Sensors, Calibration, and Maintenance