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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.
OPERA
TIONAL GUIDE
Summary of Contents for HI 2002
Page 1: ...INSTRUCTION MANUAL pH...