Agilent Technologies 3200P User Manual page 38

2 Operation
38
meter can not recognize a buffer, it will prompt with
Calibration error.
If you have created and are using a custom buffer, select
Manual Recognition. You will manually input the pH of the
selected buffer at the selected temperature.
9 Return to the Setup window.
10 Clean the pH electrode, reference electrode, and ATC
probe. Place them in the buffer to be calibrated.
11 Press [Measure]. The meter will be ready to take a
calibration reading for the first buffer solution selected in
the buffer group.
12 When the reading becomes stable, press [Enter]. The meter
will display Storing...... and save the calibration data.
13 After a few seconds, the meter will display a Continue?
prompt window. To calibrate other buffers, select the next
buffer to continue. Then repeat the measurement and save
procedures. At any time during calibration, press [Cancel]
to end calibration.
For example, to calibrate the electrode with 4.003 pH and
9.182 pH buffers, you must have selected 4.003 pH and
9.182 pH buffers in the Buffer Group Setup, otherwise the
meter will not automatically recognize these two buffers.
Even worse, it may lead to the wrong calibration.
The meter supports up to five calibration points. When the
fifth buffer is calibrated, the meter will prompt to end
calibration.
For buffers such as 6.864 pH and 7.000 pH which have
overlapping pH ranges, we recommend the following
calibration method.
• When you calibrate the 6.864 pH buffer, set the buffer
group to contain only 6.864 pH, then calibrate it. Reset
the buffer group to contain only 7.000 pH, then calibrate
it.
• You could also use the manual recognition method, in
which you manually input the pH of the selected buffer at
the selected temperature.
3200P pH Meter User Guide