19
K.
pH Buffers
The temperature coefficient of pH calibration buffers 1.68, 4.00,
4.01, 6.86, 7.00, 9.18 , 10.01 and 12.46 pH are stored inside
the meter. The buffers used to calibrate the meter must exhibit
the same temperature characteristics as the stored values.
Temperature coefficient of the pH buffers
°C
1.68 4.00 6.86 9.18 4.01 7.00 10.01 12.46
0
1.67
4.01
6.98
9.46
4.01
7.11
10.32 13.42
5
1.67
4.00
6.95
9.39
4.01
7.08
10.25 13.21
10
1.67
4.00
6.92
9.33
4.00
7.06
10.18 13.01
15
1.67
4.00
6.90
9.28
4.00
7.03
10.12 12.80
20
1.68
4.00
6.88
9.23
4.00
7.01
10.06 12.64
25
1.68 4.00 6.86 9.18 4.01 7.00 10.01 12.46
30
1.68
4.01
6.85
9.14
4.01
6.98
9.97
12.30
35
1.69
4.02
6.84
9.10
4.02
6.98
9.93
12.13
40
1.69
4.03
6.84
9.07
4.03
6.97
9.89
11.99
45
1.70
4.04
6.83
9.04
4.04
6.97
9.86
11.84
50
1.71
4.06
6.83
9.02
4.06
6.97
9.83
11.71
55
1.72
4.07
6.83
8.99
4.08
6.97
9.80
11.57
60
1.72
4.09
6.84
8.97
4.10
6.98
9.78
11.45
[Note:
The actual reading of the instrument can differ from the
values shown by ±0.01 pH
]
