Ph Calibration And Measurement - Oakton Ion 510 Series Manual

3. pH calibration and measurement

For best accuracy calibrate at least a two points using
fresh pH buffers. Select calibration buffers with calibra-
tion values closest to the measurement range you expect
to work in. A three point calibration (USA buffers: 4.01,
7.01, and 10.01 or NIST buffers: 4.01, 6.86 and 9.18)
ensures maximum accuracy throughout the measure-
ment range.
For quick checks with less accuracy, perform a one point
calibration. Select the buffer value closest to the
measurement range you will work in.
If you choose to calibrate to only 1 or 2 pH values, the
older calibration values you do not calibrate to will remain
stored. These old stored calibration values may cause
accuracy loss when your readings are close to the old
stored calibration values. To clear old calibration data,
reset the meter as shown in Section 8, Program 4.0 on
page 23.
For ATC measurements, attach the temperature probe
to the meter. The ATC mode annunciator shows on the
display. —See Figure 10. Insert the probe into the solution
to be measured so that the sample temperature can be
recorded and pH readings automatically temperature
compensate. If manual temperature compensation is
preferred, do not plug a temperature probe into the
meter.
DO NOT REUSE SOLUTIONS AFTER CALIBRATION.
Contaminants in the solution can affect the calibration,
and eventually the accuracy of the measurements.
All new pH calibrations will over-ride existing stored pH
calibration data at these calibration points. The meter
retains stored pH calibrations even when the meter is
turned OFF.
MEAS
Figure 10
introduction
starting up
pH
pH calibration
and
measurement
C
mV calibration
and
ATC
measurement
Ion calibration
and
measurement
memory
function
temperature
calibration
setup
mode
electrode
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