Operational Guide
27
pH
Calibration
Calibration
Messages
•
If the buff er temperature exceeds the temperature limits of the buff er,
“WRONG BUFFER TEMPERATURE” will be displayed.
•
Press
CLR
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 Buff er Temperature Dependence
Temperature has an eff ect on pH. The calibration buff er solutions are aff ected 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 buff er 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 fl ag 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 buff ers that can be addressed easily. These messages are seen in
Standard and Basic modes.
Wrong Buff er
This message appears when the diff erence between
the pH reading and the value of the selected buff er
is too great. If this error message is displayed, check
if you have selected the proper calibration buff er and
have poured the desired buff er.
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