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CALIBRATION MESSAGES
If the value measured by the instrument is not close to the selected buffer, “WRONG BUFFER”
will blink. Check if the correct buffer has been used, or clean the electrode by following the
Cleaning Procedure. If necessary, change the buffer or the electrode.
If the buffer temperature exceeds the temperature limits of the buffer, “WRONG BUFFER
TEMPERATURE” will be displayed.
Press SETUP/CLR key after entering calibration to clear all calibration options. “CLEAR ALL”
message will be displayed and the instrument will return to measurement mode displaying
“CAL DUE” message.
pH Buffer Temperature Dependence
Temperature has an effect on pH. The calibration buffer solutions are affected by temperature changes
also. During calibration the instrument will automatically calibrate to the pH value corresponding to
the temperature. During calibration the instrument will display the pH buffer value at 25 ºC.
TEMP pH BUFFERS
ºC ºF 1.679 3.000 4.010 6.862 7.010 9.177 10.010 12.454
0 32 1.670 3.072 4.007 6.982 7.130 9.459 10.316 13.379
5 41 1.670 3.051 4.002 6.949 7.098 9.391 10.245 13.178
10 50 1.671 3.033 4.000 6.921 7.070 9.328 10.180 12.985
15 59 1.673 3.019 4.001 6.897 7.046 9.273 10.118 12.799
20 68 1.675 3.008 4.004 6.878 7.027 9.222 10.062 12.621
25 77 1.679 3.000 4.010 6.862 7.010 9.177 10.010 12.450
30 86 1.683 2.995 4.017 6.851 6.998 9.137 9.962 12.286
35 95 1.688 2.991 4.026 6.842 6.989 9.108 9.919 12.128
40 104 1.693 2.990 4.037 6.837 6.983 9.069 9.881 11.978
45 113 1.700 2.990 4.049 6.834 6.979 9.040 9.847 11.834
50 122 1.707 2.991 4.062 6.834 6.978 9.014 9.817 11.697
55 131 1.715 2.993 4.076 6.836 6.979 8.990 9.793 11.566
60 140 1.724 2.995 4.091 6.839 6.982 8.969 9.773 11.442
65 149 1.734 2.998 4.107 6.844 6.987 8.948 9.757 11.323
70 158 1.744 3.000 4.123 6.850 6.993 8.929 9.746 11.211
75 167 1.755 3.002 4.139 6.857 7.001 8.910 9.740 11.104
80 176 1.767 3.003 4.156 6.865 7.010 8.891 9.738 11.003
85 185 1.780 3.002 4.172 6.873 7.019 8.871 9.740 10.908
90 194 1.793 3.000 4.187 6.880 7.029 8.851 9.748 10.819
95 203 1.807 2.996 4.202 6.888 7.040 8.829 9.759 10.734
The Calibration Check™ feature may flag diagnostic messages during a calibration. As electrode
aging is normally a slow process, substantial changes from previous calibrations are likely due to a
temporary problem with the electrode or buffers that can be addressed easily. These messages are
seen in Standard and Basic modes.
OPERATIONAL GUIDE
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