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29
Operational Guide
pH Bu er
Temperature
Dependence
Note: To clear a previous calibration
and to return to the default value,
press CLEAR at any time after entering
calibration mode. If CLEAR is invoked
during the rst calibration, point the
instrument returns to the measurement
mode. The CLEAR key is displayed only if
a previous calibration exists.
Temperature has an e ect on pH. The calibration bu er solutions are
a ected by temperature changes to a lesser degree than normal solutions.
During calibration, the instrument will automatically calibrate to the pH value
corresponding to the measured or set temperature.
During calibration the instrument will display the pH bu er value at 25 ºC.
Temp pH Bu ers
ºC ºF
4.01 6.00 8.30 10.01
0 32
4.01 6.12 8.48 10.32
5 41
4.00 6.09 8.44 10.24
10 50
4.00 6.06 8.41 10.18
15 59
4.00 6.04 8.37 10.12
20 68
4.00 6.02 8.33 10.06
25 77 4.01 6.00 8.30 10.01
30 86
4.02 5.99 8.27 9.96
35 95
4.03 5.98 8.24 9.92
40 104
4.04 5.97 8.21 9.88
45 113
4.05 5.97 8.18 9.85
Electrode
Calibration
Procedure
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